Computer controlled engine valve operation

Internal-combustion engines – Spark ignition timing control – Electronic control

Reexamination Certificate

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Details

C123S406480, C123S406470, C123S090150, C123S698000, C123S534000

Reexamination Certificate

active

06959692

ABSTRACT:
An electronic valve actuation system and control method is described. The valve timing is changed between early and late intake valve closing depending on engine operating conditions. Further, valve timing is adjusted to control engine airflow or engine torque. Finally, air-fuel ratio is adjusted based on feedback from an exhaust gas oxygen sensor as well as an estimate of air, fuel, and residual exhausted from cylinders operating with late valve closing (after bottom dead center) timing.

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patent: A-05-099030 (1993-04-01), None
patent: A-2002-180869 (2002-06-01), None

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