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Variable Displacement by Engine Valve Control
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English
Abstract
Intake and exhaust valve control has been combined with engine calibration control by an on-board computer to achieve a Variable Displacement Engine with improved BSFC during part throttle operation. The advent of the on-board computer, with its ability to provide integrated algorithms for the fast accurate flexible control of the entire powertrain, has allowed practical application of the valve disabler mechanism. The engine calibration basis and the displacement selection criteria are discussed, as are the fuel economy, emissions and behavior of a research vehicle on selected drive cycles ( Metro, Highway and Steady State ). Additionally, the impact upon vehicle driveability and other related subsystems ( e.g., transmission ) is addressed.
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Citation
Bates, B., Dosdall, J., and Smith, D., "Variable Displacement by Engine Valve Control," SAE Technical Paper 780145, 1978, https://doi.org/10.4271/780145.Also In
References
- Mueller Robert Uitvlugt Martin “Valve Selector Hardware” SAE Paper 780146
- Temple R.H. Devlin S.S. “The Use of Microprocessors as Automobile On-Board Controllers” IEEE International Convention and Exposition March 1974
- Moyer D.F. “Engine Control by an On-Board Computer” SAE Paper 750433 (SP-393)
- Oswald R.S. “Design Considerations for an On-Board Computer System” SAE Paper 750434 (SP-393)
- Lavoie G.A. Blumberg P.N. “Fundamental Model for Predicting HC, NOx, and Fuel consumption in the conventional Spark Ignited Engine” Eastern states section of the Combustion Institute November 1977
- Blumberg Paul N. “Powertrain Simulation A Tool for the Design and Evaluation of Engine Control Strategies in Vehicles” SAE Paper 760158
- Auiler J.E. Zbrozek J.D. Blumberg P.N. “Optimization of Automotive Engine Calibration for Better Fuel Economy - Methods and Applications” SAE paper 770076