Internal-combustion engines – Spark ignition timing control – Electronic control
Reexamination Certificate
2005-11-01
2005-11-01
Solis, Erick (Department: 3747)
Internal-combustion engines
Spark ignition timing control
Electronic control
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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Cullen Michael John
Gibson Alexander O'Connor
Hardy Larry Allen
Jankovic Mrdjan J.
Kolmanovsky Ilya V.
Alleman Hall McCoy Russell & Tuttle LLP
Ford Global Technologies LLC
Lippa Allan J.
Solis Erick
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