Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Reexamination Certificate
2005-07-12
2005-07-12
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
C123S481000, C123S19800E, C123S319000, C123S491000, C123S688000, C073S116070, C073S117020, C073S117020
Reexamination Certificate
active
06915781
ABSTRACT:
An engine control system and method for a displacement on demand internal combustion engine includes a throttle preload signal generator that outputs a throttle preload area signal having a base portion and ramp out portion. A combining circuit combines the throttle preload area signal with a current throttle area signal to generate a throttle preload difference signal that adjusts throttle area to smooth transitions during at cylinder deactivation. The engine control system smoothes the transition between activated and inactivated modes by increasing throttle area and manifold pressure when transitioning between activated and deactivated modes.
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Watanabe/Fukutani, SAE Technical Paper Series 820156, Cylinder Cutoff of 4-Stroke Cycle Engines at Part-Load and Idle, Feb. 22-26, 1982.
Argenbright Tony M.
DeVries Christopher
General Motors Corporation
Hoang Johnny H.
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