Stability Control
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Electronic stability control (ESC), also referred to as electronic stability program (ESP) or dynamic stability control (DSC), is a computerized technology that improves a vehicle's stability by detecting and reducing loss of traction ( skidding). When ESC detects loss of steering control, it automatically applies the brakes to help steer the vehicle where the driver intends to go. Braking is automatically applied to wheels individually, such as the outer front wheel to counter
oversteer Understeer and oversteer are vehicle dynamics terms used to describe the sensitivity of a vehicle to steering. Oversteer is what occurs when a car turns (steers) by more than the amount commanded by the driver. Conversely, understeer is what occu ...
, or the inner rear wheel to counter
understeer Understeer and oversteer are vehicle dynamics terms used to describe the sensitivity of a vehicle to steering. Oversteer is what occurs when a car turns (steers) by more than the amount commanded by the driver. Conversely, understeer is what occu ...
. Some ESC systems also reduce engine power until control is regained. ESC does not improve a vehicle's cornering performance; instead, it helps reduce the chance of the driver losing control of the vehicle. According to the U.S.
National Highway Traffic Safety Administration The National Highway Traffic Safety Administration (NHTSA ) is an agency of the U.S. federal government, part of the Department of Transportation. It describes its mission as "Save lives, prevent injuries, reduce vehicle-related crashes" rela ...
and the
Insurance Institute for Highway Safety The Insurance Institute for Highway Safety (IIHS) is a U.S. nonprofit organization funded by auto insurance companies, established in 1959 and headquartered in Arlington, Virginia. It works to reduce the number of motor vehicle traffic collision ...
in 2004 and 2006 respectively, one-third of fatal accidents could be prevented by the use of the technology. In Europe the electronic stability program has saved an estimated 15,000 lives. ESC has been mandatory in new cars in Canada, the US, and the European Union since 2011, 2012, and 2014, respectively. Worldwide, 82 percent of all new passenger cars feature the anti-skid system.


History

In 1983, a four-wheel electronic " Anti-Skid Control" system was introduced on the
Toyota Crown The is an automobile which has been produced by Toyota in Japan since 1955. It is primarily a line of mid-size luxury cars that is marketed as an upmarket offering in the Toyota lineup. Introduced in 1955 as the Toyopet Crown, it has served ...
.http://www.toyota-global.com/company/history_of_toyota/75years/data/automotive_business/products_technology/technology_development/chassis/index.html 75 Years of Toyota: Chassis In 1987,
Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...
, BMW and Toyota introduced their first
traction control system A traction control system (TCS), also known as ASR (from german: Antriebsschlupfregelung, lit=drive slippage regulation), is typically (but not necessarily) a secondary function of the electronic stability control (ESC) on production motor vehicle ...
s. Traction control works by applying individual wheel braking and throttle to maintain traction under acceleration, but unlike ESC, it is not designed to aid in steering. In 1990, Mitsubishi released the
Diamante A diamanté (also spelled diamante) is a glittering ornament, such as an artificial jewel (e.g. a rhinestone) or a sequin. Diamante may also refer to: Places Argentina * Diamante, Entre Ríos, a ''municipio'' in Diamante Department * Diamante ...
in Japan. It featured a new electronically controlled active trace & traction control system. Named TCL when it first entered the market, the system evolved into Mitsubishi's modern Active Skid and Traction Control (ASTC) system. Developed to help the driver maintain the intended line through a corner; an onboard computer monitored several vehicle operating parameters through various sensors. When too much
throttle A throttle is the mechanism by which fluid flow is managed by constriction or obstruction. An engine's power can be increased or decreased by the restriction of inlet gases (by the use of a throttle), but usually decreased. The term ''throttle'' ...
had been used when taking a curve, engine output and braking were automatically regulated to ensure the proper line through a curve and to provide the proper amount of traction under various road surface conditions. While conventional traction control systems at the time featured only a slip control function, Mitsubishi's TCL system had an active safety function, which improved course tracing performance by automatically adjusting the traction force (called "trace control"), thereby restraining the development of excessive lateral acceleration while turning. Although not a ‘proper’ modern stability control system, trace control monitors steering angle, throttle position and individual wheel speeds, although there is no yaw input. The TCL system's standard wheel slip control function enabled better traction on slippery surfaces or during cornering. In addition to the system's individual effect, it also worked together with the Diamante's electronically controlled suspension and
four-wheel steering Steering is a system of components, linkages, and other parts that allows a driver to control the direction of the vehicle. Introduction The most conventional steering arrangement allows a driver to turn the front wheels of a vehicle using ...
to improve total handling and performance."Control Technology"
Mitsubishi Motors South Africa website
"Mitsubishi Diamante"
Mitsubishi Motors South Africa website

Mitsubishi Motors website
"Traction Control System for Improved Driving Safety"
, SAE Technical Papers
"1992 Mitsubishi Diamante"
by Tom Incantalupo, Newsday, October 1991

by Michael Knowling, autospeed, May 2006
BMW, working with Bosch and
Continental Continental may refer to: Places * Continent, the major landmasses of Earth * Continental, Arizona, a small community in Pima County, Arizona, US * Continental, Ohio, a small town in Putnam County, US Arts and entertainment * ''Continental'' ( ...
, developed a system to reduce engine
torque In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment of force (also abbreviated to moment). It represents the capability of a force to produce change in the rotational motion of th ...
to prevent loss of control and applied it to most of the BMW model line for 1992, excluding the E30 and E36. This system could be ordered with the winter package, which came with a
limited-slip differential A limited-slip differential (LSD) is a type of differential that allows its two output shafts to rotate at different speeds but limits the maximum difference between the two shafts. Limited-slip differentials are often known by the generic tr ...
, heated seats, and heated mirrors. From 1987 to 1992, Mercedes-Benz and Bosch co-developed a system called ''Elektronisches Stabilitätsprogramm'' ("Electronic Stability Program", trademarked as ESP) to control lateral slippage.


Introduction, second generation

In 1995, three automobile manufacturers introduced ESC systems. Mercedes-Benz, supplied by Bosch, was the first to implement ESP with their Mercedes-Benz S 600 Coupé.
Toyota is a Japanese multinational automotive manufacturer headquartered in Toyota City, Aichi, Japan. It was founded by Kiichiro Toyoda and incorporated on . Toyota is one of the largest automobile manufacturers in the world, producing about 10 ...
's Vehicle Stability Control (VSC) system appeared on the
Toyota Crown Majesta The is a full-size luxury sedan from Toyota. It is an upmarket variant of the Crown and serves as Toyota's flagship model in various countries. The Crown Majesta appeared after the international introduction of the Celsior/Lexus LS in late 1 ...
in 1995.
General Motors The General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. It is the largest automaker in the United States and ...
worked with
Delphi Automotive Aptiv PLC is an Irish-American automotive technology supplier with headquarters in Dublin. Aptiv grew out of the now-defunct American company, Delphi Automotive Systems, which itself was formerly a component of General Motors. History The com ...
and introduced its version of ESC, called "StabiliTrak", in 1996 for the 1997 model year on select
Cadillac The Cadillac Motor Car Division () is a division of the American automobile manufacturer General Motors (GM) that designs and builds luxury vehicles. Its major markets are the United States, Canada, and China. Cadillac models are distributed i ...
models. StabiliTrak was made standard equipment on all GM SUVs and vans sold in the U.S. and Canada by 2007, except for certain commercial and fleet vehicles. While the StabiliTrak name is used on most General Motors vehicles for the U.S. market, "Electronic Stability Control" is used for GM's overseas brands, such as Opel, Holden and
Saab Saab or SAAB may refer to: Brands and enterprises * Saab Group, a Swedish aerospace and defence company, formerly known as SAAB, and later as Saab AB ** Datasaab, a former computer company, started as spin off from Saab AB * Saab Automobile, a fo ...
, except in the cases of Saab's 9-7X and 9-4X (which also use the StabiliTrak name). The same year, Cadillac introduced an integrated vehicle handling and software control system called the Integrated Chassis Control System (ICCS), on the
Cadillac Eldorado The Cadillac Eldorado is a luxury car manufactured and marketed by Cadillac from 1952 until 2002 over twelve generations. The Eldorado was at or near the top of the Cadillac line. The original 1953 Eldorado convertible and the Eldorado Brougham ...
. It involves an omnibus computer integration of engine, traction control, Stabilitrak electronic stability control,
steering Steering is a system of components, linkages, and other parts that allows a driver to control the direction of the vehicle. Introduction The most conventional steering arrangement allows a driver to turn the front wheels of a vehicle using ...
, and adaptive
continuously variable road sensing suspension MagneRide is an automotive adaptive suspension with magnetorheological damper system developed by the Delphi Automotive corporation, during a period when the company was a subsidiary of General Motors (GM), that uses magnetically controlled damper ...
(CVRSS), with the intent of improving responsiveness to driver input, performance, and overall safety, similar to Toyota/
Lexus is the luxury vehicle division of the Japanese automaker Toyota. The Lexus brand is marketed in more than 90 countries and territories worldwide and is Japan's largest-selling make of premium cars. It has ranked among the 10 largest Japanese ...
Vehicle Dynamics Integrated Management. In 1997,
Audi Audi AG () is a German automotive manufacturer of luxury vehicles headquartered in Ingolstadt, Bavaria, Germany. As a subsidiary of its parent company, the Volkswagen Group, Audi produces vehicles in nine production facilities worldwide. Th ...
introduced the first series production ESP for
all-wheel drive An all-wheel drive vehicle (AWD vehicle) is one with a powertrain capable of providing power to all its wheels, whether full-time or on-demand. The most common forms of all-wheel drive are: ;1x1 : All unicycles Reflecting one axle with one w ...
vehicles (
Audi A8 The Audi A8 is a full-size luxury sedan manufactured and marketed by the German automaker Audi since 1994. Succeeding the Audi V8, and now in its fourth generation, the A8 has been offered with both front- or permanent all-wheel drive—and in s ...
and
Audi A6 The Audi A6 is an executive car made by the German automaker Audi. Now in its fifth generation, the successor to the Audi 100 is manufactured in Neckarsulm, Germany, and is available in saloon and estate configurations, the latter marketed by Aud ...
with quattro (four-wheel drive system)). In 1998,
Volvo Cars Volvo Cars ( sv, Volvo personvagnar, styled VOLVO in the company's logo) is a Swedish multinational manufacturer of luxury vehicles headquartered in Torslanda, Gothenburg. The company manufactures SUVs, station wagons, and sedans. The company's ...
began to offer their version of ESC called Dynamic Stability and Traction Control (DSTC) on the new
Volvo S80 The Volvo S80 is an executive car produced by the Swedish manufacturer Volvo Cars from 1998 to 2016 across two generations. It took the place of the rear-wheel-drive S90 as Volvo's flagship sedan. The first generation (1998–2006) was made a ...
. Meanwhile, others investigated and developed their own systems. During a
moose test The evasive manoeuvre test (Swedish: ''Undanmanöverprov''; colloquial: moose test or elk test; Swedish: ''Älgtest'', German: ''Elchtest'') is performed to determine how well a certain vehicle evades a suddenly appearing obstacle. This test has ...
, Swedish journalist Robert Collin of ''
Teknikens Värld ''Teknikens värld'' ( en, World of Technology) is a leading motor magazine published in Stockholm, Sweden. History and profile ''Teknikens Värld'' was founded in 1948. The magazine is owned by Bonnier Group. Its publisher is Bonnier Tidskrifte ...
''
rolled Rolling is a Motion (physics)#Types of motion, type of motion that combines rotation (commonly, of an Axial symmetry, axially symmetric object) and Translation (geometry), translation of that object with respect to a surface (either one or the ot ...
a Mercedes A-Class (without ESC) at 78 km/h in October 1997. Because Mercedes Benz promoted a reputation for safety, they recalled and retrofitted 130,000 A-Class cars with firmer suspension and sportier tyres; all newly produced A- class featured ESC as standard along with the upgraded suspension and wheels. This produced a significant reduction in crashes, and the number of vehicles with ESC rose. The availability of ESC in small cars like the A-Class ignited a market trend; thus, ESC became available for all models (whether standard or as an option).
Ford Ford commonly refers to: * Ford Motor Company, an automobile manufacturer founded by Henry Ford * Ford (crossing), a shallow crossing on a river Ford may also refer to: Ford Motor Company * Henry Ford, founder of the Ford Motor Company * Ford F ...
's version of ESC, called AdvanceTrac, was launched in the year 2000. Ford later added
Roll Stability Control An active rollover protection (ARP), is a system that recognizes impending rollover and selectively applies brakes to resist.http://www-nrd.nhtsa.dot.gov/pdf/esv/esv19/05-0471-O.pdf Bosch Rollover Mitigation Functions ARP builds on electronic s ...
to AdvanceTrac which was first introduced in the
Volvo XC90 The Volvo XC90 is a mid-size luxury SUV manufactured and marketed by Volvo Cars since 2002 and now in its second generation. The first generation was introduced at the 2002 North American International Auto Show and used the Volvo P2 platform ...
in 2003. It has been implemented in many Ford vehicles since. Ford and Toyota announced that all their North American vehicles would be equipped with ESC standard by the end of 2009 (it was standard on Toyota
SUVs A sport utility vehicle (SUV) is a car classification that combines elements of road-going passenger cars with features from off-road vehicles, such as raised ground clearance and four-wheel drive. There is no commonly agreed-upon definitio ...
as of 2004, and after the 2011 model year, all Lexus, Toyota, and
Scion Scion may refer to: Arts, entertainment, and media Fictional entities *Scion, a playable class in the game ''Path of Exile'' (2013) *Atlantean Scion, a device in the ''Tomb Raider'' video game series *Scions, an alien race in the video game ''Ba ...
vehicles had ESC; the last one to get it was the 2011 model-year
Scion tC The Scion tC is a compact car manufactured by Toyota under its Scion brand from 2004 to 2016 over two generations: ANT10 (2004–2010) and AGT20 (2010–2016). Both generations were built in Japan. The tC was introduced first in the United States ...
). However, as of November 2010, Ford still sold models in North America without ESC. General Motors had made a similar announcement for the end of 2010.


Third generation and after

The market for ESC is growing quickly, especially in European countries such as Sweden, Denmark, and Germany. For example, in 2003 in Sweden the purchase rate on new cars with ESC was 15%. The Swedish road safety administration issued a strong ESC recommendation and in September 2004, 16 months later, the purchase rate was 58%. A stronger ESC recommendation was then given and in December 2004, the purchase rate on new cars had reached 69% and by 2008 it had grown to 96%. ESC advocates around the world are promoting increased ESC use through legislation and public awareness campaigns and by 2012, most new vehicles should be equipped with ESC.


Legislation

In 2009, the European Union decided to make ESC mandatory. Since November 1, 2011, EU
type approval Type approval or certificate of conformity is granted to a product that meets a minimum set of regulatory, technical and safety requirements. Generally, type approval is required before a product is allowed to be sold in a particular country, so ...
is only granted to models equipped with ESC. Since November 1, 2014, ESC has been required on all newly registered cars in the EU. The
NHTSA The National Highway Traffic Safety Administration (NHTSA ) is an agency of the U.S. federal government, part of the Department of Transportation. It describes its mission as "Save lives, prevent injuries, reduce vehicle-related crashes" relat ...
required all new passenger vehicles sold in the US to be equipped with ESC as of the 2012 model year, and estimated it will prevent 5,300–9,600 annual fatalities. A similar requirement has been proposed for new trucks and buses, but it has not yet been finalized.


Concept and operation

During normal driving, ESC continuously monitors steering and vehicle direction. It compares the driver's intended direction (determined by the measured steering wheel angle) to the vehicle's actual direction (determined through measured lateral acceleration, vehicle rotation, and individual road wheel speeds).


Normal operation

ESC intervenes only when it detects a probable loss of steering control, such as when the vehicle is not going where the driver is steering. This may happen, for example, when skidding during emergency evasive swerves, understeer or oversteer during poorly judged turns on slippery roads, or
hydroplaning Aquaplaning or hydroplaning by the tires of a road vehicle, aircraft or other wheeled vehicle occurs when a layer of water builds between the wheels of the vehicle and the road surface, leading to a loss of traction that prevents the vehicle fr ...
. During high-performance driving, ESC can intervene when unwanted, because steering input may not always be indicative of the intended direction of travel (such as during controlled drifting). ESC estimates the direction of the skid, and then applies the brakes to individual wheels asymmetrically in order to create torque about the vehicle's vertical axis, opposing the skid and bringing the vehicle back in line with the driver's commanded direction. Additionally, the system may reduce engine power or operate the transmission to slow the vehicle down. ESC can function on any surface, from dry pavement to frozen lakes. It reacts to and corrects skidding much faster and more effectively than the typical human driver, often before the driver is even aware of any imminent loss of control. This has led to some concern that ESC could allow drivers to become overconfident in their vehicle's handling and/or their own driving skills. For this reason, ESC systems typically alert the driver when they intervene, so that the driver is aware that the vehicle's handling limits have been reached. Most activate a dashboard indicator light and/or alert tone; some intentionally allow the vehicle's corrected course to deviate very slightly from the driver-commanded direction, even if it is possible to more precisely match it. All ESC manufacturers emphasize that the system is not a performance enhancement nor a replacement for safe driving practices, but rather a safety technology to assist the driver in recovering from dangerous situations. ESC does not increase traction, so it does not enable faster cornering (although it can facilitate better-controlled cornering). More generally, ESC works within the limits of the vehicle's handling and available traction between the tyres and road. A reckless maneuver can still exceed these limits, resulting in loss of control. For example, during hydroplaning, the wheels that ESC would use to correct a skid may lose contact with the road surface, reducing its effectiveness. Due to the fact that stability control can be incompatible with high-performance driving, many vehicles have an override control which allows the system to be partially or fully deactivated. In simple systems, a single button may disable all features, while more complicated setups may have a multi-position switch or may never be fully disengaged.


Off-road use

ESC systems—due to their ability to enhance vehicle stability and braking—often work to improve traction in off-road situations, in addition to their on-road duties. The effectiveness of traction control systems can vary significantly, due to the significant number of external and internal factors involved at any given time, as well as the programming and testing performed by the manufacturer. At a rudimentary level, off-road traction varies from typical operational characteristics of on-road traction, depending on the terrain encountered. In an open differential setup, power transfer takes the path of least resistance. In slippery conditions, this means when one wheel loses traction, power will counter-productively be fed to that axle instead of the one with higher grip. ESCs focus on braking wheels that are spinning at a rate drastically different from the opposing axle. While on-road application often supplements rapidly intermittent wheel braking with a reduction of power in loss-of-traction situations, off-road use will typically require consistent (or even increased) power delivery to retain vehicle momentum while the vehicle's braking system applies intermittent braking force over a longer duration to the slipping wheel until excessive wheel-spin is no longer detected. In intermediate level ESC systems, ABS will be disabled, or the computer will actively lock the wheels when brakes are applied. In these systems, or in vehicles without ABS, the performance in emergency braking in slippery conditions is greatly improved as grip state can change extremely rapidly and unpredictably off-road when coupled with inertia. When the brakes are applied and wheels are locked, the tyres do not have to contend with the wheel rolling (providing no braking force) and braking repeatedly. Grip provided by the tyres is constant and as such can make full use of traction wherever it is available. This effect is enhanced where more aggressive tread patterns are present as the large tread lugs dig into the imperfections on the surface or below the substrate, as well as dragging dirt in front of the tyre to increase the rolling resistance even further. Many newer vehicles designed for off-road duties from the factory, are equipped with Hill Descent Control systems to minimise the risk of such runaway events occurring with novice drivers and provide a more consistent and safe descent than either no ABS, or on-road orientated ABS. These systems aim to keep a fixed speed (or user selected speed) while descending, applying strategic braking or acceleration at the correct moments to ensure wheels all rotate at the same rate while applying full locking braking when required. In some vehicles, ESC systems automatically detect whether to operate in off- or on-road mode, depending on the engagement of the 4WD system. Mitsubishi's unique Super-Select 4WD system (found in Pajero, Triton and Pajero Sport models), operates in on-road mode in 2WD as well as 4WD High-range with the centre differential unlocked. However, it automatically activates off-road traction control and disables ABS braking when shifted into 4WD High-range with centre differential locked, or 4WD Low-range with centre differential locked. Most modern vehicles with fully electronically controlled 4WD systems such as various Land Rovers and Range Rovers, also automatically switch to an off-road-orientated mode of stability and traction control once low range, or certain terrain modes are manually selected.


Effectiveness

Numerous studies around the world have confirmed that ESC is highly effective in helping the driver maintain control of the car, thereby saving lives and reducing the probability of occurrence and severity of crashes. In the fall of 2004, the American
National Highway and Traffic Safety Administration The National Highway Traffic Safety Administration (NHTSA ) is an agency of the U.S. federal government, part of the Department of Transportation. It describes its mission as "Save lives, prevent injuries, reduce vehicle-related crashes" relat ...
(NHTSA) confirmed international studies, releasing results of a field study of ESC effectiveness in the USA. The NHTSA concluded that ESC reduces crashes by 35%. Additionally,
SUV A sport utility vehicle (SUV) is a car classification that combines elements of road-going passenger cars with features from off-road vehicles, such as raised ground clearance and four-wheel drive. There is no commonly agreed-upon definiti ...
s with stability control are involved in 67% fewer accidents than SUVs without the system. The United States
Insurance Institute for Highway Safety The Insurance Institute for Highway Safety (IIHS) is a U.S. nonprofit organization funded by auto insurance companies, established in 1959 and headquartered in Arlington, Virginia. It works to reduce the number of motor vehicle traffic collision ...
(IIHS) issued its own study in June 2006 showing that up to 10,000 fatal US crashes could be avoided annually if all vehicles were equipped with ESC. The IIHS study concluded that ESC reduces the likelihood of all fatal crashes by 43%, fatal single-vehicle crashes by 56%, and fatal single-vehicle rollovers by 77–80%. ESC is described as the most important advance in auto safety by many experts, including
Nicole Nason Nicole Robilotto Nason (born August 12, 1970) is an American government official who served as the 26th Administrator of the Federal Highway Administration from 2019 to 2021. Nason previously served as the Assistant Secretary of State for Adminis ...
, administrator of the NHTSA, Jim Guest and David Champion of Consumers Union of the
Fédération Internationale de l'Automobile The Fédération Internationale de l'Automobile (FIA; en, International Automobile Federation) is an association established on 20 June 1904 to represent the interests of motoring organisations and motor car users. It is the governing body for ...
(FIA), E-Safety Aware, Csaba Csere, former editor of Car and Driver, and Jim Gill, long time ESC proponent of Continental Automotive Systems. The European New Car Assessment Program (
Euro NCAP The European New Car Assessment Programme (Euro NCAP) is a European voluntary car safety performance assessment programme (i.e. a New Car Assessment Program) based in Leuven (Belgium) formed in 1996, with the first results released in February ...
) "strongly recommends" that people buy cars fitted with stability control. The IIHS requires that a vehicle must have ESC as an available option in order for it to qualify for their ''Top Safety Pick'' award for occupant protection and accident avoidance.


Components and design

ESC incorporates yaw rate control into the anti-lock braking system (ABS). Anti-lock brakes enable ESC to slow down individual wheels. Many ESC systems also incorporate a traction control system (TCS or ASR), which senses drive-wheel slip under acceleration and individually brakes the slipping wheel or wheels and/or reduces excess engine power until control is regained. However, ESC serves a different purpose from that of ABS or traction control. The ESC system uses several
sensor A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends ...
s to determine where the driver intends to travel. Other sensors indicate the actual state of the vehicle. The control algorithm compares driver input to vehicle response and decides, when necessary, to apply brakes and/or reduce throttle by the amounts calculated through the
state space A state space is the set of all possible configurations of a system. It is a useful abstraction for reasoning about the behavior of a given system and is widely used in the fields of artificial intelligence and game theory. For instance, the toy ...
(set of equations used to model the dynamics of the vehicle). The ESC controller can also receive data from and issue commands to other controllers on the vehicle such as an
all-wheel drive An all-wheel drive vehicle (AWD vehicle) is one with a powertrain capable of providing power to all its wheels, whether full-time or on-demand. The most common forms of all-wheel drive are: ;1x1 : All unicycles Reflecting one axle with one w ...
system or an
active suspension An active suspension is a type of automotive suspension on a vehicle. It uses an onboard system to control the vertical movement of the vehicle's wheels relative to the chassis or vehicle body rather than the passive suspension provided by large sp ...
system to improve vehicle stability and controllability. The sensors in an ESC system have to send data at all times in order to detect a loss of traction as soon as possible. They have to be resistant to possible forms of interference, such as
precipitation In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail. ...
or
pothole A pothole is a depression in a road surface, usually asphalt pavement, where traffic has removed broken pieces of the pavement. It is usually the result of water in the underlying soil structure and traffic passing over the affected area. Water ...
s. The most important sensors are as follows: *A steering wheel angle sensor that determines where the driver wants to steer. This kind of sensor often uses AMR elements. *A
yaw rate sensor A yaw-rate sensor is a gyroscopic device that measures a vehicle's yaw rate, its angular velocity around its vertical axis. The angle between the vehicle's heading and velocity is called its slip angle, which is related to the yaw rate. Types Th ...
that measures the rotation rate of the car. The data from the yaw sensor is compared with the data from the steering wheel angle sensor to determine regulating action. *A lateral acceleration sensor that measures the vehicle's lateral acceleration. This is often called an
accelerometer An accelerometer is a tool that measures proper acceleration. Proper acceleration is the acceleration (the rate of change of velocity) of a body in its own instantaneous rest frame; this is different from coordinate acceleration, which is accele ...
. *Wheel speed sensors that measure wheel speed. Other sensors can include: *A longitudinal acceleration sensor that is similar to the lateral acceleration sensor in design, but provides additional information about road pitch, as well as being another sensor for vehicle acceleration and speed. *A roll rate sensor that is similar to the yaw rate sensor in design, but improves the fidelity of the controller's vehicle model and provides more accurate data in combination with the other sensors. ESC uses a hydraulic modulator to assure that each wheel receives the correct brake force. A similar modulator is used in ABS. Whereas ABS reduces hydraulic pressure during braking, ESC may increase pressure in certain situations, and an active vacuum brake booster unit may be utilised in addition to the hydraulic pump to meet these demanding pressure gradients. At the centre of the ESC system is the
electronic control unit An electronic control unit (ECU), also known as an electronic control module (ECM), is an embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a car or other motor vehicle. Modern vehic ...
(ECU), which contains various control techniques. Often, the same ECU is used for different systems at the same time (such as ABS, traction control, or climate control). The input signals are sent through an input circuit to the digital controller. The desired vehicle state is determined based upon the steering wheel angle, its gradient, and the wheel speed. Simultaneously, the yaw sensor measures the vehicle's actual yaw rate. The controller computes the needed brake or acceleration force for each wheel and directs the valves of the hydraulic modulator. The ECU is connected with other systems via a
Controller Area Network A Controller Area Network (CAN bus) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other's applications without a host computer. It is a message-based protocol, designed originally for mu ...
interface in order to avoid conflicting with them. Many ESC systems have an override switch so the driver can disable ESC, which may be used on loose surfaces such as mud or sand, or if using a small
spare tire A spare tire (or stepney in some countries) is an additional tire (or tyre - see spelling differences) carried in a motor vehicle as a replacement for one that goes flat, has a blowout, or has another emergency. ''Spare tire'' is generally a mi ...
, which could interfere with the sensors. Some systems also offer an additional mode with raised thresholds, so that a driver can utilize the limits of their vehicle's grip with less electronic intervention. However, the ESC reactivates when the ignition is restarted. Some ESC systems that lack an off switch, such as on many recent Toyota and Lexus vehicles, can be temporarily disabled through an undocumented series of brake pedal and handbrake operations. Furthermore, unplugging a wheel speed sensor is another method of disabling most ESC systems. The ESC implementation on newer Ford vehicles cannot be completely disabled, even through the use of the "off switch". The ESC will automatically reactivate at highway speeds, and below such speeds if it detects a skid with the brake pedal depressed.


Regulation


Public awareness and law

While Sweden used public awareness campaigns to promote ESC use, others implemented or proposed legislation. The Canadian province of Quebec was the first jurisdiction to implement an ESC law, making it compulsory for carriers of dangerous goods (without data recorders) in 2005. The United States followed, requiring ESC for all passenger vehicles under 10,000 pounds (4536 kg), phasing in the regulation starting with 55% of 2009 models (effective 1 September 2008), 75% of 2010 models, 95% of 2011 models, and all 2012 models. Canada required all new passenger vehicles to have ESC from 1 September 2011. The Australian government announced on 23 June 2009 that ESC would be compulsory from 1 November 2011 for all new passenger vehicles sold in Australia, and for all new vehicles from November 2013, however the State Government of Victoria preceded this unilaterally on Jan 1 2011, much as they had done seatbelts 40 years before. The New Zealand government followed suit in February 2014 making it compulsory on all new vehicles from 1 July 2015 with a staggered roll-out to all used-import passenger vehicles by 1 January 2020. The European Parliament has also called for the accelerated introduction of ESC. The European Commission has confirmed a proposal for the mandatory introduction of ESC on all new cars and commercial vehicle models sold in the EU from 2012, with all new cars being equipped by 2014. Argentina requires all new normal cars to have ESC since 1 January 2022, for all new normal vehicles from January 2024. Chile requires all new cars to have ESC from August 2022. Brazil will require all new cars to have ESC from 1 January 2024.


International vehicle regulations

The
United Nations Economic Commission for Europe The United Nations Economic Commission for Europe (ECE or UNECE) is one of the five regional commissions under the jurisdiction of the United Nations Economic and Social Council. It was established in order to promote economic cooperation and i ...
has passed a Global Technical Regulation to harmonize ESC standards. Global Technical Regulation No. 8 ELECTRONIC STABILITY CONTROL SYSTEMS was sponsored by the United States of America, and is based on Federal Motor Vehicle Safety Standard FMVSS126. In Unece countries, approval is based on UN Regulation 140: Electronic Stability Control (ESC) Systems.


Availability and cost


Cost

ESC is built on top of an anti-lock brake system, and all ESC-equipped vehicles are fitted with traction control. ESC components include a yaw rate sensor, a lateral acceleration sensor, a steering wheel sensor, and an upgraded integrated control unit. In the US, federal regulations have required that ESC be installed as a standard feature on all passenger cars and light trucks as of the 2012 model year. According to NHTSA research, ABS in 2005 cost an estimated
US$ The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official ...
368; ESC cost a further US$111. The retail price of ESC varies; as a stand-alone option it retails for as little as US$250. ESC was once rarely offered as a sole option, and was generally not available for aftermarket installation. Instead, it was frequently bundled with other features or more expensive trims, so the cost of a package that included ESC was several thousand dollars. Nonetheless, ESC is considered highly cost-effective and may pay for itself in reduced insurance premiums.


Availability

Availability of ESC in passenger vehicles has varied between manufacturers and countries. In 2007, ESC was available in roughly 50% of new North American models compared to about 75% in Sweden. However, consumer awareness affects buying patterns, so that roughly 45% of vehicles sold in North America and the UK were purchased with ESC, contrasting with 78–96% in other European countries such as Germany, Denmark, and Sweden. While few vehicles had ESC prior to 2004, increased awareness has increased the number of vehicles with ESC on the used car market. ESC is available on cars, SUVs and pickup trucks from all major automakers. Luxury cars, sports cars, SUVs, and crossovers are usually equipped with ESC. Midsize cars have also been gradually catching on, though the 2008 model years of the
Nissan Altima The Nissan Altima is a mid-size car that has been manufactured by Nissan since 1992. It is a continuation of the Nissan Bluebird line, which began in 1955. The Altima has historically been larger, more powerful, and more luxurious than the Nissa ...
and Ford Fusion only offered ESC on their V6 engine-equipped cars; however, some midsize cars, such as the
Honda Accord The , also known as the in Japan and China for certain generations, is a series of cars manufactured by Honda since 1976, best known for its four-door sedan variant, which has been one of the best-selling cars in the United States since 1989. ...
, had it as standard by then. While traction control is usually included with ESC, there were vehicles such as the 2008
Chevrolet Malibu The Chevrolet Malibu is a mid-size car manufactured and marketed by Chevrolet from 1964 to 1983 and again since 1997. The Malibu began as a trim-level of the Chevrolet Chevelle, becoming its own model line in 1978. Originally a rear-wheel-drive ...
LS, 2008
Mazda6 The Mazda6 (known as the Mazda Atenza in Japan and China, derived from the Italian '' attenzione'') is a mid-size sedan produced by Mazda since 2002, replacing the long-produced Capella/626. The Mazda6 was marketed as the first example of the co ...
, and 2007
Lincoln MKZ The Lincoln MKZ, is a four-door, five-passenger mid-size luxury sedan manufactured by Ford and marketed as the Zephyr ( MY 2006) and as the MKZ (MY 2007–2020) by Ford's Lincoln brand across two generations in both gasoline and hybrid gas/electri ...
that had traction control but not ESC. ESC was rare among subcompact cars in 2008. The 2009
Toyota Corolla The is a series of compact cars (formerly subcompact) manufactured and marketed globally by the Toyota Motor Corporation. Introduced in 1966, the Corolla was the best-selling car worldwide by 1974 and has been one of the best-selling cars in ...
in the United States (but not Canada) had stability control as a $250 option on all trims below that of the XRS, which had it as standard. In Canada, for the 2010 Mazda3, ESC was an option on the midrange GS trim as part of its
sunroof A sunroof is a movable panel that opens to uncover a window in an automobile roof, allowing light and fresh air to enter the passenger compartment. Sunroofs can be manually operated or motor driven, and are available in many shapes, sizes and styl ...
package, and is standard on the top-of-the-line GT version. The 2009 Ford Focus had ESC as an option for the S and SE models, and it was standard on the SEL and SES models In the UK, even mass-market
supermini The B-segment is the second smallest of the European segments for passenger cars between the A-segment and C-segment, and commonly described as "small cars". The B-segment is the largest segment in Europe by volume, accounting for 20 percent of ...
s such as the Ford Fiesta Mk.6 and VW Polo Mk.5 came with ESC as standard. Elaborate ESC and ESP systems (including Roll Stability Control) are available for many commercial vehicles, including transport trucks, trailers, and buses from manufacturers such as Daimler,
Scania Scania, also known by its native name of Skåne (, ), is the southernmost of the historical provinces of Sweden, provinces (''landskap'') of Sweden. Located in the south tip of the geographical region of Götaland, the province is roughly conte ...
, and
Prevost Prevost, Prévost or Prévôt may refer to: Places * Prévost (electoral district), Quebec, a provincial electoral district * Prévost, Quebec, a community in the Laurentians region of Quebec, Canada ** Prévost station * Prevost, a community ...
,. In heavy trucks the ESC and ESP functions must be realized as part of the pneumatic brake system. Typical component and system suppliers are e.g. Bendix, and WABCO,. ESC is also available on some motor homes. The ''ChooseESC!'' campaign, run by the EU's ''eSafetyAware!'' project, provides a global perspective on ESC. One ''ChooseESC!'' publication shows the availability of ESC in EU member countries. In the US, the Insurance Institute for Highway Safety website shows availability of ESC in individual US models and the National Highway Traffic Safety Administration website lists US models with ESC. In
Australia Australia, officially the Commonwealth of Australia, is a Sovereign state, sovereign country comprising the mainland of the Australia (continent), Australian continent, the island of Tasmania, and numerous List of islands of Australia, sma ...
, the
NRMA NRMA (formerly National Roads and Motorists' Association) is an Australian organisation offering roadside assistance, advocacy for motorists and road-users, motoring advice, car servicing, International Driving Permits, travel and other services ...
shows the availability of ESC in Australian models.


Future

Just as ESC is founded on the anti-lock braking system (ABS), ESC is the foundation for new advances such as Roll Stability Control or active rollover protection that works in the vertical plane much like ESC works in the horizontal plane. When RSC detects impending rollover (usually on transport trucks or SUVs), RSC applies brakes, reduces throttle, induces understeer, and/or slows down the vehicle. The computing power of ESC facilitates the networking of active and passive safety systems, addressing other causes of crashes. For example, sensors may detect when a vehicle is following too closely and slow down the vehicle, straighten up seat backs, and tighten seat belts, avoiding and/or preparing for a crash.


ESC products


Product names

Electronic stability control (ESC) is the generic term recognised by the
European Automobile Manufacturers Association The European Automobile Manufacturers Association (french: Association des Constructeurs Européens d'Automobiles; abbreviated ACEA) is the main lobbying and standards group of the automobile industry in the European Union. In February 1991 it b ...
(ACEA), the North American
Society of Automotive Engineers SAE International, formerly named the Society of Automotive Engineers, is a United States-based, globally active professional association and standards developing organization for engineering professionals in various industries. SAE Internatio ...
(SAE), the
Japan Automobile Manufacturers Association , or JAMA, is a trade association with its headquarters in Tokyo, Japan. It was founded in April 1967 and serves as a platform for the automakers of Japan to share technological developments and management practices. There are currently 14 mem ...
, and other worldwide authorities. However, vehicle manufacturers may use a variety of different trade names for ESC: *
Acura Acura is the luxury vehicle, luxury and performance division of Japanese automaker Honda, based primarily in North America. The brand was launched in the United States and Canada on March 27, 1986, marketing luxury and performance automobiles. It ...
: Vehicle Stability Assist (VSA) (formerly CSL 4-Drive TCS) *
Alfa Romeo Alfa Romeo Automobiles S.p.A. () is an Italian luxury car manufacturer and a subsidiary of Stellantis. The company was founded on 24 June 1910, in Milan, Italy. "Alfa" is an acronym of its founding name, "Anonima Lombarda Fabbrica Automobili." ...
: Vehicle Dynamic Control (VDC) *
Audi Audi AG () is a German automotive manufacturer of luxury vehicles headquartered in Ingolstadt, Bavaria, Germany. As a subsidiary of its parent company, the Volkswagen Group, Audi produces vehicles in nine production facilities worldwide. Th ...
: Electronic Stability Program (ESP) *
Bentley Bentley Motors Limited is a British designer, manufacturer and marketer of luxury cars and SUVs. Headquartered in Crewe, England, the company was founded as Bentley Motors Limited by W. O. Bentley (1888–1971) in 1919 in Cricklewood, North ...
: Electronic Stability Program (ESP) * BMW: Co engineering partner and inventor with Robert BOSCH GmbH and Continental (TEVES) Dynamic Stability Control (DSC) (including Dynamic Traction Control) *
Bugatti Automobiles Ettore Bugatti was a German then French manufacturer of high-performance automobiles. The company was founded in 1909 in the then-German city of Molsheim, Alsace, by the Italian-born industrial designer Ettore Bugatti. The cars w ...
: Electronic Stability Program (ESP) *
Buick Buick () is a division of the American automobile manufacturer General Motors (GM). Started by automotive pioneer David Dunbar Buick in 1899, it was among the first American marques of automobiles, and was the company that established General ...
: StabiliTrak *
Cadillac The Cadillac Motor Car Division () is a division of the American automobile manufacturer General Motors (GM) that designs and builds luxury vehicles. Its major markets are the United States, Canada, and China. Cadillac models are distributed i ...
: StabiliTrak and StabiliTrak3.0 with Active Front Steering (AFS) *
Chery Chery Automobile Co. Ltd., trading as Chery and sometimes known by the pinyin transcription of its Chinese name, ''Qirui'' (), is a Chinese state-owned automobile manufacturer headquartered in Wuhu, Anhui, China. Founded in 1997, it is curre ...
: Electronic Stability Program *
Chevrolet Chevrolet ( ), colloquially referred to as Chevy and formally the Chevrolet Motor Division of General Motors Company, is an American automobile division of the American manufacturer General Motors (GM). Louis Chevrolet (1878–1941) and ous ...
: StabiliTrak and Active Handling (Corvette & Camaro only) *
Chrysler Stellantis North America (officially FCA US and formerly Chrysler ()) is one of the " Big Three" automobile manufacturers in the United States, headquartered in Auburn Hills, Michigan. It is the American subsidiary of the multinational automoti ...
: Electronic Stability Program (ESP) *
Citroën Citroën () is a French automobile brand. The "Automobiles Citroën" manufacturing company was founded in March 1919 by André Citroën. Citroën is owned by Stellantis since 2021 and previously was part of the PSA Group after Peugeot acquired ...
: Electronic Stability Program (ESP) *
Daihatsu , commonly known as Daihatsu, is a Japanese automobile manufacturer and one of the oldest surviving Japanese internal combustion engine manufacturers. The company's headquarters are located in Ikeda, Osaka Prefecture. Historically, Daihatsu was ...
: Vehicle Stability Control (VSC) *
Dodge Dodge is an American brand of automobiles and a division of Stellantis, based in Auburn Hills, Michigan. Dodge vehicles have historically included performance cars, and for much of its existence Dodge was Chrysler's mid-priced brand above P ...
: Electronic Stability Program (ESP) * Daimler: Electronic Stability Program (ESP) *
Fiat Fiat Automobiles S.p.A. (, , ; originally FIAT, it, Fabbrica Italiana Automobili di Torino, lit=Italian Automobiles Factory of Turin) is an Italian automobile manufacturer, formerly part of Fiat Chrysler Automobiles, and since 2021 a subsidiary ...
: Electronic Stability Control (ESC) and Vehicle Dynamic Control (VDC) *
Ferrari Ferrari S.p.A. (; ) is an Italian luxury sports car manufacturer based in Maranello, Italy. Founded by Enzo Ferrari (1898–1988) in 1939 from the Alfa Romeo racing division as ''Auto Avio Costruzioni'', the company built its first car in ...
: Controllo Stabilità (CST) *
Ford Ford commonly refers to: * Ford Motor Company, an automobile manufacturer founded by Henry Ford * Ford (crossing), a shallow crossing on a river Ford may also refer to: Ford Motor Company * Henry Ford, founder of the Ford Motor Company * Ford F ...
: AdvanceTrac with Roll Stability Control (RSC) and Interactive Vehicle Dynamics (IVD) and Electronic Stability Program (ESP); Dynamic Stability Control (DSC) (Australia only) *
General Motors The General Motors Company (GM) is an American Multinational corporation, multinational Automotive industry, automotive manufacturing company headquartered in Detroit, Michigan, United States. It is the largest automaker in the United States and ...
: StabiliTrak *
Honda is a Japanese public multinational conglomerate manufacturer of automobiles, motorcycles, and power equipment, headquartered in Minato, Tokyo, Japan. Honda has been the world's largest motorcycle manufacturer since 1959, reaching a product ...
: Vehicle Stability Assist (VSA) (formerly CSL 4-Drive TCS) *
Holden Holden, formerly known as General Motors-Holden, was an Australian subsidiary company of General Motors. It was an Australian automobile manufacturer, importer, and exporter which sold cars under its own marque in Australia. In its last thre ...
: Electronic Stability Program (ESP) *
Hyundai Hyundai is a South Korean industrial conglomerate ("chaebol"), which was restructured into the following groups: * Hyundai Group, parts of the former conglomerate which have not been divested ** Hyundai Mobis, Korean car parts company ** Hyundai ...
: Electronic Stability Program (ESP), Electronic Stability Control (ESC) and Vehicle Stability Assist (VSA) *
Infiniti is the luxury vehicle division of the Japanese automaker Nissan. Infiniti officially started selling vehicles on November 8, 1989, in North America. The marketing network for Infiniti-branded vehicles included dealers in over 50 countries in ...
: Vehicle Dynamic Control (VDC) * Isuzu: Electronic Vehicle Stability Control (EVSC) *
Jaguar The jaguar (''Panthera onca'') is a large cat species and the only living member of the genus '' Panthera'' native to the Americas. With a body length of up to and a weight of up to , it is the largest cat species in the Americas and the th ...
: Dynamic Stability Control (DSC), and Automatic Stability Control (ASC) *
Jeep Jeep is an American automobile marque, now owned by multi-national corporation Stellantis. Jeep has been part of Chrysler since 1987, when Chrysler acquired the Jeep brand, along with remaining assets, from its previous owner American Moto ...
: Electronic Stability Program (ESP) *
Kia Kia Corporation, commonly known as Kia (, ; formerly known as Kyungsung Precision Industry and Kia Motors Corporation), is a South Korean multinational automobile manufacturer headquartered in Seoul, South Korea. It is South Korea's second lar ...
: Electronic Stability Control (ESC) and Electronic Stability Program (ESP) *
Lamborghini Automobili Lamborghini S.p.A. () is an Italian brand and manufacturer of luxury sports cars and SUVs based in Sant'Agata Bolognese. The company is owned by the Volkswagen Group through its subsidiary Audi. Ferruccio Lamborghini (1916–1993) ...
: Electronic Stability Program (ESP) *
Land Rover Land Rover is a British brand of predominantly four-wheel drive, off-road capable vehicles, owned by multinational car manufacturer Jaguar Land Rover (JLR), since 2008 a subsidiary of India's Tata Motors. JLR currently builds Land Rovers ...
: Dynamic Stability Control (DSC) *
Lexus is the luxury vehicle division of the Japanese automaker Toyota. The Lexus brand is marketed in more than 90 countries and territories worldwide and is Japan's largest-selling make of premium cars. It has ranked among the 10 largest Japanese ...
: Vehicle Dynamics Integrated Management (VDIM) with Vehicle Stability Control (VSC) *Luxgen: Electronic Stability Control (ESC) *Lincoln Motor Company, Lincoln: AdvanceTrac *Maserati: Maserati Stability Program (MSP) *Mazda: Dynamic Stability Control (DSC) (including Dynamic Traction Control) *
Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquartere ...
(co-inventor) with Robert BOSCH GmbH: Electronic Stability Program (ESP) *Mercury (automobile), Mercury: AdvanceTrac *Mini (marque), Mini: Dynamic Stability Control *Mitsubishi: Active Skid and Traction Control MULTIMODE and Active Stability Control (ASC) *Nissan: Vehicle Dynamic Control (VDC) *Oldsmobile: Precision Control System (PCS) *Opel: Electronic Stability Program (ESP) and Trailer Stability Program (TSP) *Peugeot: Electronic Stability Program (ESP) *Pontiac (automobile), Pontiac: StabiliTrak *Porsche: Porsche Stability Management (PSM) *PROTON Holdings, Proton: Electronic Stability Control (ESC) or Vehicle Dynamics Control (VDC) *Renault: Electronic Stability Program (ESP) *Rover Group: Dynamic Stability Control (DSC) *
Saab Saab or SAAB may refer to: Brands and enterprises * Saab Group, a Swedish aerospace and defence company, formerly known as SAAB, and later as Saab AB ** Datasaab, a former computer company, started as spin off from Saab AB * Saab Automobile, a fo ...
: Electronic Stability Program (ESP) or StabiliTrak *Saturn Corporation, Saturn: StabiliTrak *Scania (company), Scania: Electronic Stability Program (ESP) *SEAT: Electronic Stability Program (ESP) *Škoda Auto, Škoda: Electronic Stability Program (ESP) and Electronic Stability Control (ESC) *Smart (marque), Smart: Electronic Stability Program (ESP) *Subaru: Vehicle Dynamics Control (VDC) *Suzuki: Electronic Stability Program (ESP) *Tata Motors, Tata: Electronic Stability Programme (ESP) (not to be confused with Corner Stability Control and Brake Sway Control) *
Toyota is a Japanese multinational automotive manufacturer headquartered in Toyota City, Aichi, Japan. It was founded by Kiichiro Toyoda and incorporated on . Toyota is one of the largest automobile manufacturers in the world, producing about 10 ...
: Vehicle Stability Control (VSC) and Vehicle Dynamics Integrated Management (VDIM) *Tesla Motors, Tesla: Electronic Stability Control (ESC) *Vauxhall Motors, Vauxhall: Electronic Stability Program (ESP) *Volvo Cars, Volvo: Dynamic Stability and Traction Control (DSTC) *Volkswagen: Electronic Stability Program (ESP)


System manufacturers

ESC system manufacturers include: * Fujitsu Ten Ltd. * Robert Bosch GmbH * Aisin Seiki Co., Aisin Advics * Bendix Corporation * Continental Automotive Systems * BeijingWest Industries * Hitachi, Ltd., Hitachi * ITT Automotive, since 1982 part of Continental AG * Johnson Electric * Mando Corporation * Veoneer Nissin Brake Systems (former Nissin Kogyo, which owns 49% of the company) * Teves, now part of Continental AG * TRW Inc., TRW * WABCO Vehicle Control Systems, WABCO * Hyundai Mobis * Knorr-Bremse


References


External links


Bosch ESC InformationChooseESC! a combined initiative
from the European Commission, eSafetyAware, and
Euro NCAP The European New Car Assessment Programme (Euro NCAP) is a European voluntary car safety performance assessment programme (i.e. a New Car Assessment Program) based in Leuven (Belgium) formed in 1996, with the first results released in February ...

NHTSA on ESC including US Regulation and list of US vehicles with ESC
{{DEFAULTSORT:Electronic Stability Control Advanced driver assistance systems Automotive technology tradenames Mechanical power control