Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Reexamination Certificate
2005-01-18
2005-01-18
Denion, Thomas (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
C123S090160, C123S090170
Reexamination Certificate
active
06843214
ABSTRACT:
A method is disclosed for balancing work output from cylinder banks of an engine having a common crankshaft and separate intake camshafts with cam phasers for each bank. The method includes sensing a crankshaft rotational characteristic, such as instantaneous rotational speed or acceleration, during the power strokes of pistons of predetermined comparable cylinders (or all cylinders) of each bank, computing average crankshaft rotational characteristics for the power strokes of the comparable cylinders of each bank, and adjusting the phasing of at least one of the intake camshafts to obtain equal averages of the sensed characteristics of the crankshaft during the power strokes of the respective banks.
REFERENCES:
patent: 5983876 (1999-11-01), Irons et al.
patent: 6021758 (2000-02-01), Carey et al.
Tuttle,Controlling Engine Load by means of Late Intake-Valve Closing, SAE Paper No. 800794, 1981.*
Tuttle, Controlling Engine Load by means of Early Intake-valve Closing, SAE Paper No. 820408, 1982.
Barr, Jr. Karl F.
Denion Thomas
Eshete Zelalem
General Motors Corporation
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