Air-fuel ratio feedback control method for internal combustion e

Details Air-fuel ratio feedback control method for internal combustion e Air-fuel ratio feedback control method for internal combustion e

1988-01-26

1989-01-10

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 2308, F02B 300

Patent

active

047965894

ABSTRACT:
A method of effecting feedback control of the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine, to bring the air-fuel ratio to desired values by correcting a fuel quantity to be supplied to the engine by means of a correction coefficient which varies in response to output from an exhaust gas concentration sensor, when the engine is operating in an air-fuel ratio feedback control region. An average value of values of the correction coefficient obtained is calculated while the engine is operating in the feedback control region. The calculated average value is corrected in dependence on a temperature of the engine and the feedback control is initiated by using the corrected average value as an initial value of the correction coefficient when the engine has shifted into the feedback control region from the another region. The calculated average value is corrected to such a value as to make the air-fuel ratio leaner as the engine temperature is lower.

REFERENCES:
patent: 4715344 (1987-12-01), Tomisawa
patent: 4729359 (1988-03-01), Tomisawa et al.
patent: 4730594 (1988-03-01), Hibino et al.

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