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DIRAVI
DIRAVI is the name given by Citroën to its proprietary power steering system, first seen in 1970. DIRAVI is an acronym for "''Direction à rappel asservi''" literally meaning "steering with controlled return" more accurately described in English as "power steering with power assisted return". In the UK, it was marketed as ''VariPower'' and in the U.S. as ''SpeedFeel.'' This was the first commercially available variable assist power steering arrangement, allowing the motorist power assist when parking, but recognizing that less steering assistance was needed at high speed. This feature is now spreading to mainstream vehicles, using electrical motors rather than hydraulic actuation. Citroën engineer Paul Magès invented the system as part of its effort to engineer a practical high horsepower, front wheel drive car - a new type of vehicle at the time. This DIRAVI system is an addition to the integrated Citroën hydropneumatic suspension and braking system. These all drew power f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citroën XM
The Citroën XM is a front-engine, front-drive, five-passenger, five-door hatchback noted for its hydropneumatic suspension. Manufactured and marketed by Citroën from 1989 to 2000, with a minor facelift in 1994, XM production reached 333,405 over the course of 11 years. The XM was voted 1990 European Car of the Year. History Launched on 23 May 1989, the XM was the company's flagship saloon, replacing the Citroën CX. It went on sale in its native France immediately afterwards, and was available in right-hand drive on the UK market from October 1989. The CX remained in production until the spring of 1991, when the XM Estate launched. The XM did not enjoy the commercial success of its predecessors, the CX and the DS, which each raised the bar of automotive performance for other manufacturers. Total sales of the XM reached 330,000 in 11 years, and the XM's replacement, the Citroën C6, was launched at the end of 2005. By the second half of the 1990s, sales were in sharp decl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citroën SM
The Citroën SM is a high-performance coupé produced by the French manufacturer Citroën from 1970 to 1975. The SM placed third in the 1971 European Car of the Year contest, trailing its stablemate Citroën GS, and won the 1972 ''Motor Trend'' Car of the Year award in the U.S. History In 1961, Citroën began work on 'Project S' – a sports variant of the Citroën DS. As was customary for the firm, many running concept vehicles were developed, increasingly complex and upmarket from the DS. At some stage in the 9-year project, it evolved from developing a faster variant of the 1955 DS to developing an entirely new, thoroughly engineered car – in terms of engineering effort, a replacement for the high volume DS model. Citroën purchased Maserati in 1968 with the intention of harnessing Maserati's high-performance engine technology to produce a true Gran Tourer car, combining the sophisticated Citroën suspension with a Maserati V6. The result was the Citroën SM, first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Power Steering
A power steering is a mechanical device equipped on a motor vehicle that helps drivers steer the vehicle by reducing steering effort needed to turn the steering wheel, making it easier for the vehicle to turn or maneuver at lower speeds. Hydraulic or electric actuators add controlled energy to the steering mechanism, so the driver can provide less effort to turn the steered wheels when driving at typical speeds, and reduce considerably the physical effort necessary to turn the wheels when a vehicle is stopped or moving slowly. Power steering can also be engineered to provide some artificial feedback of forces acting on the steered wheels. Hydraulic power steering systems for cars augment steering effort via an actuator, a hydraulic cylinder that is part of a servo system. These systems have a direct mechanical connection between the steering wheel and the linkage that steers the wheels. This means that power-steering system failure (to augment effort) still permits the vehicle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 a hand–operated steering wheel positioned in front of the driver. The steering wheel is attached to a steering column A column or pillar in architecture and structural engineering is a structural element that transmits, through compression, the weight of the structure above to other structural elements below. In other words, a column is a compression member. ..., which is linked to rods, pivots and gears that allow the driver to change the direction of the front wheels. Other arrangements are sometimes found on different types of vehicles; for example, a tiller or rear-wheel steering. Tracked vehicles such as bulldozers and tanks usually employ differential steering, where the tracks are made to move at different speeds or even in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydropneumatic
Hydropneumatic suspension is a type of motor vehicle suspension system, designed by Paul Magès, invented by Citroën, and fitted to Citroën cars, as well as being used under licence by other car manufacturers, notably Rolls-Royce ( Silver Shadow), Bmw 5-Series e34 Touring, Maserati (Quattroporte II) and Peugeot. It was also used on Berliet trucks and has more recently been used on Mercedes-Benz cars, where it is known as ''Active Body Control.'' The Toyota Soarer UZZ32 "Limited" was fitted with a fully integrated four-wheel steering and a complex, computer-controlled hydraulic ''Toyota Active Control Suspension'' in 1991. Similar systems are also widely used on modern tanks and other large military vehicles. The suspension was referred to as ''oléopneumatique'' in early literature, pointing to oil and air as its main components. The purpose of this system is to provide a sensitive, dynamic and high-capacity suspension that offers superior ride quality on a variety of surface ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 89.95% share in 1976. Citroën's head office is located in the Stellantis Poissy Plant in Saint-Ouen-sur-Seine since 2021 (previously in Rueil-Malmaison) and its offices studies and research in Vélizy-Villacoublay, Poissy (CEMR), Carrières-sous-Poissy and Sochaux-Montbéliard. In 1934, the firm established its reputation for innovative technology with the Citroën Traction Avant, Traction Avant. This was the world's first car to be mass-produced with front-wheel drive, four-wheel independent suspension, as well as unibody construction, omitting a separate chassis, and instead using the body of the car itself as its main load-bearing structure. In 1954, they produced the world's first hydropneumatic self-levelling suspension system then, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maserati Khamsin
The Maserati Khamsin (''Tipo AM120'') is a grand tourer produced by Italian automobile manufacturer Maserati between 1974 and 1982. The Khamsin was sold alongside the DeTomaso-based Maserati Kyalami — also a V8 2+2 GT car - between 1976 and 1982. Following Maserati's tradition it was named after a wind: the Khamsin, a hot, violent gust blowing in the Egyptian desert for fifty days a year. History The Khamsin was introduced on the Bertone stand at the November 1972 Turin Auto Show as a concept car. Designed by Marcello Gandini, it was Bertone's first work for Maserati. Its design highlight was a clear rear section which housed the tail lights along with a sharp, angular design in contrast to its predecessor. In March 1973, the production model was shown at the Paris Motor Show. Regular production of the vehicle started only a year later, in 1974. The Khamsin was developed under Citroën's ownership for a clientele that demanded a front-engined grand tourer on the lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Citroën CX
The Citroën CX is a large, front-engined, front-wheel-drive executive car manufactured and marketed by Citroën from 1974 to 1991. Production models took the form of a four-door fastback sedan, station wagon (estate), and a long-wheelbase fastback limousine. The CX is known for its hydropneumatic self-leveling suspension system, and its low coefficient of drag, underscored by its nameplate ''CX'', which references the aerodynamics symbol c_x for drag coefficient. Voted the 1975 European Car of the Year, the CX has been described by some enthusiasts as the last " real Citroën" before Peugeot took control of the company in 1976. The CX was also the final successful model of the "big Citroën" era, dating back to 1934. History The CX was launched at the 1974 Paris Motor Show. Citroën was unable to schedule right-hand drive production of the car until well into 1975. The CX was initially a huge success in Europe, with more than 132,000 being produced in 1978. It found customers ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paul Magès
Paul Ernest Mary Magès (1908–1999) is known for his invention of the first self-leveling automobile suspension, known as hydro-pneumatic suspension. This system replaced conventional steel springs with an adaptive system of hydraulic struts, resulting in a motoring experience that felt like no other automobile of the era. This suspension achieved its initial design brief: fast travel on poor road surfaces. This advantage is still noted today, especially in applications where ride quality is important, like ambulance design. His formal schooling was modest. He earned his National diploma (''Brevet d'Etudes du Premier Cycle''), a preparatory course for the Académie des Arts et Métiers in Marseille. At age 17, he sent his résumé to Citroën, one of the major automobile manufacturers in France, where he was hired to maintain equipment. In 1936 he became a technical draftsman, and in January 1942, CEO Pierre-Jules Boulanger assigned him to the development department to solve p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Accumulator
A hydraulic accumulator is a pressure storage reservoir in which an incompressible hydraulic fluid is held under pressure that is applied by an external source of mechanical energy. The external source can be an engine, a spring, a raised weight, or a compressed gas.Although liquids are generally considered to be practically incompressible, gases may be compressed and this compressed gas is a convenient energy store. An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations. It is a type of energy storage device. Compressed gas accumulators, also called hydro-pneumatic accumulators, are by far the most common type. Types of accumulators Towers The first accumulators for William Armstrong's hydraulic dock machinery were simple raised water towers. Water was pumped to a tank at the top of these towers by steam pumps. When dock machinery required hydraulic po ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pump
A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fluid: ''direct lift'', ''displacement'', and ''gravity'' pumps. Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pond filtering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oil and natural gas or for operating cooling towers and other components of heating, ventilation and air conditioning systems. In the medical industry, pumps are used for biochemical processes in developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificial heart and penile prosthesis. When a casing contains only one revolving impeller, it is called a single-stage pump. Whe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Front Wheel Drive
Front-wheel drive (FWD) is a form of engine and transmission layout used in motor vehicles, where the engine drives the front wheels only. Most modern front-wheel drive vehicles feature a transverse engine, rather than the conventional longitudinal engine arrangement generally found in rear-wheel drive and four-wheel drive vehicles. Location of engine and transmission By far the most common layout for a front-wheel drive car is with the engine and transmission at the front of the car, mounted transversely. Other layouts of front-wheel drive that have been occasionally produced are a front-engine mounted longitudinally, a mid-engine layout and a rear-engine layout. History Prior to 1900 Experiments with front-wheel drive cars date to the early days of the automobile. The world's first self-propelled vehicle, Nicolas-Joseph Cugnot's 1769/1770 "fardier à vapeur", was a front-wheel driven three-wheeled steam-tractor. It then took at least a century, for the firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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