Quasi-constant volume (QCV) spark ignition combustion

Chen, Rui and Winward, Edward and Stewart, Paul and Taylor, Ben and Gladwin, Dan (2009) Quasi-constant volume (QCV) spark ignition combustion. In: 2009 SAE World Congress, 20-23 April, 2009, Cobo Centre, Detroit, MI, USA.

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Quasi-Constant Volume (QCV) Spark Ignition Combustion
The Otto cycle delivers theoretical maximum thermal efficiency. The traditional design of internal combustion engines using a simple slide-crank mechanism gives no time for a constant volume combustion which significantly reduces the cycle efficiency. In this study, using a high torque, high bandwidth, permanent magnet electric drive system attached to the crankshaft, variable angular velocities of the engine crankshaft were implemented. The system enabled reductions in piston velocity around the top dead centre region to a fraction of its value at constant crankshaft angular velocity typical in conventional engines. A quasi-constant volume combustion has thus been successfully achieved, leading to improvements in engine fuel consumption and power output which are discussed in detail.
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Abstract

The Otto cycle delivers theoretical maximum thermal efficiency. The traditional design of internal combustion engines using a simple slide-crank mechanism gives no time for a constant volume combustion which significantly reduces the cycle efficiency. In this study, using a high torque, high bandwidth, permanent magnet electric drive system attached to the crankshaft, variable angular velocities of the engine crankshaft were implemented. The system enabled reductions in piston velocity around the top dead centre region to a fraction of its value at constant crankshaft angular velocity typical in conventional engines. A quasi-constant volume combustion has thus been successfully achieved, leading to improvements in engine fuel consumption and power output which are discussed in detail.

Item Type:Conference or Workshop Item (Presentation)
Keywords:spark ignition, combustion
Subjects:H Engineering > H330 Automotive Engineering
Divisions:College of Science > School of Engineering
ID Code:2230
Deposited By:INVALID USER
Deposited On:06 Mar 2010 14:55
Last Modified:17 Jul 2014 11:12

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