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- W1539260521 abstract "The numerous variable valve actuation mechanisms for poppet valves need to be classified, if sensible comparisons are to be made, and one possible taxonomy is presented here. Not all the mechanisms proposed have been tested, but where they have it is usually with gasoline engines. It is well established that controlling the valve events can raise and flatten the torque curve. However, it is difficult to quantify and compare the gains in torque and consequential reduction in fuel consumption, as the results depend very much on the starting point. This is also the case when variable valve actuation is used to reduce engine emissions. Fortunately it is quite easy to realize suitable variable valve overlap, and the point of inlet valve closure. The other main application to gasoline engines, is in obtaining load control without throttling. The thermodynamic background is discussed here along with some experimental results; the suitability of some of the mechanisms for this purpose is assessed. The application of variable valve timing to diesel engines is discussed." @default.
- W1539260521 created "2016-06-24" @default.
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- W1539260521 creator A5085057074 @default.
- W1539260521 date "1989-02-01" @default.
- W1539260521 modified "2023-09-25" @default.
- W1539260521 title "Variable Valve Actuation Mechanisms and the Potential for their Application" @default.
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- W1539260521 doi "https://doi.org/10.4271/890673" @default.
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