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Variator (variable Valve Timing)
Variable valve timing (VVT) is a system for varying the valve opening of an internal combustion engine. This allows the engine to deliver high power, but also to work tractably and efficiently at low power. There are many systems for VVT, which involve changing either the relative timing, duration or opening of the engine's inlet and exhaust valves. One of the first practical VVT systems used a variator to change the phasePhase refers to the relative timing between the inlet and exhaust camshafts, expressed as an angular measure. of the camshaft and valves. This simple system cannot change the duration of the valve opening, or their lift.'Lift' is the distance by which the valves open. Later VVT systems, such as the helical camshaft or the movable fulcrum systems, could change these factors too. Despite this limitation, the variator is a relatively simple device to add to an existing engine and so they remain in service today. As the benefit of the variator relies on changing the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Valve Timing
In internal combustion engines, variable valve timing (VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. It is increasingly being used in combination with variable valve lift systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems. Two-stroke engines use a power valve system to get similar results to VVT. Background theory The valves within an internal combustion engine are used to control the flow of the intake and exhaust gases into and out of the combustion chamber. The timing, duration and lift of these valve events has a significant impact on engine performance. Without variable valve timing or variable valve lift, the valve timing is the same for all engine speeds and conditions, therefore compromises are neces ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alfa Romeo GTV And Spider
The Alfa Romeo GTV and the Alfa Romeo Spider (Type 916) were sports cars produced by the Italian manufacturer Alfa Romeo from 1993 to 2004. The GTV is a 2+2 coupé, and the Spider is a two-seater roadster version of the GTV. Around 39,000 Spiders and 41,700 GTVs were built. The GTV's name (Gran Turismo Veloce— en, Fast Grand Touring) placed it as the successor to the long-discontinued Alfetta GTV coupé, whereas the Spider was effectively the replacement for the then 30-year-old 105-series Giulia Spider. The GTV was available until the launch of the Brera in 2005, while the Spider lasted another year until the launch of its Brera-based successor in 2006. The Alfa Romeo GTV was described as "one of the best sports cars of its time" by Jeremy Clarkson in 1998 and was listed at number 29 in Top 100 Cars in 2001. Design Both cars were designed by Enrico Fumia at Pininfarina. The GTV was planned to re-establish Alfa Romeo's sporty coupe tradition for the 1990s. The design ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable Cam Timing
Variable Camshaft Timing (VCT) is an automobile variable valve timing technology developed by Ford. It allows for more optimum engine performance, reduced emissions, and increased fuel efficiency compared to engines with fixed camshafts. It uses electronically controlled hydraulic valves that direct high pressure engine oil into the camshaft phaser cavity. These oil control solenoids are bolted into the cylinder heads towards the front of the engine near the camshaft phasers. The powertrain control module (PCM) transmits a signal to the solenoids to move a valve spool that regulates the flow of oil to the phaser cavity. The phaser cavity changes the valve timing by rotating the camshaft slightly from its initial orientation, which results in the camshaft timing being advanced or retarded. The PCM adjusts the camshaft timing depending on factors such as engine load and RPM. History For twin cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hall Effect
The Hall effect is the production of a voltage difference (the Hall voltage) across an electrical conductor that is transverse to an electric current in the conductor and to an applied magnetic field perpendicular to the current. It was discovered by Edwin Hall in 1879. A Hall effect can also occur across a void or hole in a semiconductor or metal plate, when current is injected via contacts that lie on the boundary or edge of the void or hole, and the charge flows outside the void or hole, in the metal or semiconductor. This Hall effect becomes observable in a perpendicular applied magnetic field across voltage contacts that lie on the boundary of the void on either side of a line connecting the current contacts. It exhibits apparent sign reversal in comparison to the standard "ordinary Hall effect" in the simply connected specimen, and depends only on the current injected from within the void. Superposition may also be realized in the Hall effect: first imagine the standard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engine Control Unit
An engine control unit (ECU), also commonly called an engine control module (ECM), is a type of electronic control unit that controls a series of actuators on an internal combustion engine to ensure optimal engine performance. It does this by reading values from a multitude of sensors within the engine bay, interpreting the data using multidimensional performance maps (called lookup tables), and adjusting the engine actuators. Before ECUs, air–fuel mixture, ignition timing, and idle speed were mechanically set and dynamically controlled by mechanical and pneumatic means. If the ECU has control over the fuel lines, then it is referred to as an electronic engine management system (EEMS). The fuel injection system has the major role of controlling the engine's fuel supply. The whole mechanism of the EEMS is controlled by a stack of sensors and actuators. Workings Control of air–fuel ratio Most modern engines use some type of fuel injection to deliver fuel to the cylinders. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydraulic Fluid
A hydraulic fluid or hydraulic liquid is the medium by which power is transferred in hydraulic machinery. Common hydraulic fluids are based on mineral oil or water. Examples of equipment that might use hydraulic fluids are excavators and backhoes, hydraulic brakes, power steering systems, automatic transmissions, garbage trucks, aircraft flight control systems, lifts, and industrial machinery. Hydraulic systems like the ones mentioned above will work most efficiently if the hydraulic fluid used has zero compressibility. Functions and properties The primary function of a hydraulic fluid is to convey power. In use, however, there are other important functions of hydraulic fluid such as protection of the hydraulic machine components. The table below lists the major functions of a hydraulic fluid and the properties of a fluid that affect its ability to perform that function: Composition Base stock The original hydraulics fluid, dating back to the time of ancient Egypt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cylinder Bank
The engine configuration describes the fundamental operating principles by which internal combustion engines are categorized. Piston engines are often categorized by their cylinder layout, valves and camshafts. Wankel engines are often categorized by the number of rotors present. Gas turbine engines are often categorized into turbojets, turbofans, turboprops and turboshafts. Piston engines Piston engines are usually designed with the cylinders in lines parallel to the crankshaft. It is called a straight engine (or 'inline engine') when the cylinders arranged in a single line. Where the cylinders are arranged in two or more lines (such as in V engines or flat engines), each line of cylinders is referred to as a 'cylinder bank'. The angle between cylinder banks is called the 'bank angle'. Engines with multiple banks are shorter than straight engines and can be designed to cancel out the unbalanced forces from each bank, in order to reduce the vibration. Most engines with fou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
W12 Engine
A W12 engine is a twelve-cylinder piston engine where three banks of four cylinders are arranged in a W configuration around a common crankshaft. W12 engines with three banks of four cylinders were used by several aircraft engines from 1917 until the 1930s. A three-bank design was also used for an unsuccessful W12 engine which was intended to compete in Formula One in 1990. W12 engines are less common than V12 engines as only a handful of automobile manufacturers use them. The W12 engine has been produced by the Volkswagen Group since 2001. This four-bank engine – based on two VR6 engines with a common crankshaft – has only been used in flagship high performance car models produced under the Volkswagen Group. Aircraft engines The Napier Lion was a three-bank design (also called "broad arrow" design) W12 engine produced in the United Kingdom from 1917 to the late 1930s. It had a capacity of and produced . As well as use in various military and racing airplanes, the Lion ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
W8 Engine
A W8 engine is an eight-cylinder piston engine with four banks of two cylinders each, arranged in a W configuration. In practice, the W8 engine is created from two narrow-angle (15 degree) VR4 engines mounted at an angle of 72 degrees from each other on a common crankshaft. Thus, the resulting four banks align to form a "W". W8 engines are much less common than V8 engines, and the only W8 engine to reach production was manufactured by Volkswagen from 2001–2004. Volkswagen W8 engine The sole W8 engine to reach production was the Volkswagen 4-litre W8 engine, which was available in the Volkswagen Passat (B5.5) from September 2001 to September 2004. Production was minimal at only 11,000 units. This engine had a displacement of , had a peak power rating of at 6,000 rpm and a peak torque rating of at 2,750 rpm. Power and torque outputs were lower than competitors V8 engines with similar capacity, however the W8 engine was praised for its smoothness. Sales of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
VR6 Engine
VR6 engines are V6 piston engines with a narrow angle between the cylinder banks and a single cylinder head covering both banks of cylinders. Volkswagen Group introduced the first VR6 engine in 1991 and VR6 engines currently remain in production. From 1997 to 2006, Volkswagen also produced a five-cylinder VR5 engine based on the VR6. Description The name VR6 comes from the German initials for a V engine (German: ''V-Motor'') and a straight (inline) engine (German: ''Reihenmotor''), therefore the VR engine is described as a "Vee-Inline engine" (VR-Motor). VR6 engines share a common cylinder head for the two banks of cylinders. Only two camshafts are needed for the engine, regardless of whether the engine has two or four valves per cylinder. This simplifies engine construction and reduces costs. Since the cylinders are not located on the centreline of the combined cylinder head, the lengths of the intake and exhaust ports are different for each bank. Without compensation, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
V5 Engine
A V5 engine is a five-cylinder piston engine where the cylinders share a common crankshaft and are arranged in a V configuration. V5 engine designs are very uncommon, with the only production version of one being the 1997–2006 Volkswagen Group VR5 engine. Automobiles General Motors In the early 1980s, Oldsmobile developed a prototype V5 diesel engine, however it never reached production stages and the project was subsequently abandoned. The engine is based on the Oldsmobile V6 diesel engine with the fuel injection pump in the location of the "missing" sixth cylinder. A prototype engine is on display at the RE Olds Museum in Lansing, Michigan. Volkswagen Group The only V5 automobile engine to reach production was the "VR5" engine manufactured by Volkswagen from 1997 to 2006. Based on Volkswagen's VR6 engine, the VR5 was a narrow-angle engine with staggered cylinders (three cylinders on one bank and two on the other) sharing a single cylinder head. As per the VR6 en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vane Phasers T-GDI
Vane may refer to: People * Vane (surname) * Vane Featherston (1864–1948), English stage actress * Ivan Vane Ivanović (1913–1999), Yugoslav-British athlete, shipowner, political activist, and philanthropist * Vane Pennell (1876–1938), English rackets and real tennis player * Viscount Vane, an extinct title in the Peerage of Ireland Places * Vanë, a settlement in Albania * Vane, Avatime, a populated place in Ghana * Vāne Parish, Latvia * Vane Glacier, Marie Byrd Land, Antarctica Other uses * ''Vane'' (album), the only album by Bleak, released in 1995 * Parts besides the shaft in a pennaceous feather * A plastic fin on an arrow * D-alanine—D-serine ligase, an enzyme (VanE) * Vane, singular form of Vanir, a group of gods in Norse mythology * ''Vane (video game)'', a video game released for the Playstation 4 See also * Vane display, a type of 7-segment display * Vane anemometer * Cooper vane * Rotary vane pump * Weather vane * Vanes Martirosyan (born 1986) Armenian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
