Exhaust gas recirculation control system having a function of au

Details Exhaust gas recirculation control system having a function of au Exhaust gas recirculation control system having a function of au

1982-04-29

1983-10-18

Burns, Wendell E.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123417, 123480, F02M 2506

Patent

active

044099487

ABSTRACT:
An exhaust gas recirculation control system which is adapted to control the valve opening of the exhaust gas recirculation valve so as to minimize the difference between a detected value of the valve opening of the above valve and a command value read from a memory as a function of operating condition of the engine. The system includes a memory means adapted to store as a new reference zero position value an actual value of the valve opening detected when a command value for full closing of the valve is continuously read from the memory for a predetermined period of time, and an arithmetic means adapted to perform substraction of the value stored in the above memory means from a subsequently detected value of the valve opening or addition of the stored value to a command value subsequently read from the memory, thereby automatically compensating for changes in the detected zero opening value of the exhaust gas recirculation valve.

REFERENCES:
patent: 4181944 (1980-01-01), Yamauchi et al.

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