Method of controlling combustion engine timing

Details Method of controlling combustion engine timing Method of controlling combustion engine timing

1992-08-10

1993-10-19

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123418, F02D 4116, F02D 4300

Patent

active

052536238

ABSTRACT:
A method is provided for maintaining the speed of a spark-ignited internal combustion engine operating at a desired idle speed to compensate for engine speed variations caused by torque disturbances, utilizing an actual idle speed and the desired idle speed expressed as an RPM error ratio. A desired operating torque ratio is determined based on the torque available, a torque ratio reserve created by retarding spark from the maximum spark advance value and a torque ratio correction which reflects the torque disturbance. A desired final spark advance value is obtained from the desired operating torque ratio utilizing a nonlinear relationship between spark advance and torque ratio. The spark advance is modified to the desired final spark advance value so as to vary the torque supplied by the engine in order to maintain the desired idle speed.

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