Combustion state control apparatus for internal combustion engin

Details Combustion state control apparatus for internal combustion engin Combustion state control apparatus for internal combustion engin

1993-07-12

1994-11-08

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123568, F02B 4708

Patent

active

053617452

ABSTRACT:
An apparatus for controlling an engine operation such as EGR rate for an internal combustion engine is disclosed with an air/fuel mixture ratio control. In the control apparatus, a variable representing a characteristic of a combustion state in the engine is detected and a difference of the combustion state variable, a target value is averaged for each rich/lean period T determined from the variation of a feedback correction coefficient so that a basic EGR (Exhaust Gas Recirculation) rate determined according to the engine operating condition is corrected on the basis of the average value to derive a final EGR rate. Thus, the variation in the EGR rate cannot be amplified or incremented even when the variation in the combustion state variable occurs due to the influence of the variation in the air/fuel mixture ratio.

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