variable+engine+speed

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• Variable valve timing — Variable valve timing, or VVT, is a generic term for an automobile piston engine technology. VVT allows the lift or duration or timing (some or all) of the intake or exhaust valves (or both) to be changed while the engine is in operation. Two… …   Wikipedia

• Variable length intake manifold — (VLIM) is an automobile engine manifold technology. As the name implies, VLIM can vary the length of the intake tract in order to optimize power and torque, as well as provide better fuel efficiency.There are two main effects of variable intake… …   Wikipedia

• Variable valve actuation — Variable Valve Actuation, or VVA, is a generalised term used to describe any mechanism or method that can alter the shape or timing of a valve lift event within an internal combustion engine. There are many ways in which this can be achieved,… …   Wikipedia

• Engine efficiency — of thermal engines is the relationship between the total energy contained in the fuel, and the amount of energy used to perform useful work. There are two classifications of thermal engines (1) Internal combustion (gasoline, diesel and gas… …   Wikipedia

• variable belt transmission — A continuously variable transmission using rubber V belts on expanding contracting pulleys, depending on engine speed and load; originally developed by van Doorne for DAF and then used on the Volvo 340 …   Dictionary of automotive terms

• Variable displacement — is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi cylinder engines. Many automobile manufacturers have… …   Wikipedia

• Engine braking — is where the retarding forces within an engine are used to slow a vehicle down, as opposed to using an external braking mechanism, for example friction brakes or magnetic brakes. The term is often confused with several other types of braking,… …   Wikipedia

• Variable compression ratio — is the technology to adjust internal combustion engine cylinder compression ratios on the fly. This is done to increase fuel efficiency while under varying loads. Higher loads require lower ratios to be more efficient and vice versa. Variable… …   Wikipedia

• Engine tuning — is the adjustment, modification or design of internal combustion engines to yield optimal performance, either in terms of power output or economy. It has a long history, almost as long as the development of the car in general, originating with… …   Wikipedia

• Variable Data Intelligent Postscript Printware — (FreeFlow VI Suite (VIPP)) is an open language from Xerox that enables highest performance output of personalized (variable data) PostScript documents [http://vippsupport.xerox.com/eve VIPP Support Forum] VIPP was originally called XGF and it is… …   Wikipedia

• Engine control unit — An engine control unit (ECU) is an electronic control unit which controls various aspects of an internal combustion engine s operation. The simplest ECUs control only the quantity of fuel injected into each cylinder each engine cycle. More… …   Wikipedia