SAE Technical Paper Series 1988
DOI: 10.4271/880388
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Variable Valve Timing-A Possibility to Control Engine load without Throttle

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Cited by 47 publications
(7 citation statements)
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“…Early IVC controls engine load by closing the inlet valve when sufficient charge has been admitted into the cylinder. Reductions in Brake Specific Fuel Consumption of up to 10% have been observed with early IVC strategies [29,30]. Recent studies by Fontana et al [31] and by Cairns et al [32] show similar reductions in fuel consumption, but explain these referring to the displacement of fresh air with combustion products during the valve overlap interval, which reduces the need for throttling.…”
Section: Vvt Strategies and Influence On Charge Diluent Fractionmentioning
confidence: 96%
“…Early IVC controls engine load by closing the inlet valve when sufficient charge has been admitted into the cylinder. Reductions in Brake Specific Fuel Consumption of up to 10% have been observed with early IVC strategies [29,30]. Recent studies by Fontana et al [31] and by Cairns et al [32] show similar reductions in fuel consumption, but explain these referring to the displacement of fresh air with combustion products during the valve overlap interval, which reduces the need for throttling.…”
Section: Vvt Strategies and Influence On Charge Diluent Fractionmentioning
confidence: 96%
“…Because of fresh mixture backflow at low engine speed, and inertia of the incoming gas flow at higher speed [11], the IVC timing shows significant effects on cylinder trapped mass, and hence on the resulting pumping (intake throttling) losses. Sizeable improvements in thermal efficiency have been observed with early IVC strategies, owing to greater effective compression ratio [12,13].…”
Section: Variable Camshaft Timingmentioning
confidence: 99%
“…Numerous camshaft-based variable-valve mechanisms have been developed [1,.9, 10,11,14,18,26,27,29,30,33,38,47,54]. A recent search on U.S. patent data base with the phrase 'variable valve timing" resulted in 196 patents.…”
Section: Background and Technical Objectivesmentioning
confidence: 99%