System and method for determining engine stop position

Details System and method for determining engine stop position System and method for determining engine stop position

2006-01-17

2006-01-17

Kwon, John T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S397000

Reexamination Certificate

active

06988031

ABSTRACT:
The present invention provides a system for determining engine stop position and includes an engine tracking subsystem and a throttle control subsystem. The engine tracking subsystem is coupled to the engine and determines the engine position by sensing rotation of the crankshaft. Once the engine controller receives an engine shutdown signal, the throttle is controlled to lower the air pressure in the intake manifold of the engine. Lowered as such, the resulting reversal torque caused by compression of air in the cylinders is smaller than the friction load torque of the engine and engine reversal is eliminated or substantially reduced. When the engine has stopped, the engine tracking system stores the last engine position for use during the next engine startup.

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