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

1984-06-07

1986-02-25

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123492, 123493, F02B 300

Patent

active

045721297

ABSTRACT:
A method of controlling the air-fuel ratio of an air-fuel mixture being supplied to an internal combustion engine by the use of a coefficient which is variable in value in response to the output of an exhaust gas ingredient concentration detecting means, while the engine is operating in a predetermined air-fuel ratio feedback control region. When the engine is operating in the above region, a calculation is made of a mean value of values of the coefficient which have been applied in the past feedback control. When a transition occurs in the engine operation from a region other than the predetermined feedback control region to the latter region, the calculated mean value of the coefficient is corrected by a predetermined value through multiplication or addition, and the air-fuel ratio feedback control is initiated by the use of the corrected mean value of the coefficient as an initial value. Preferably, in an engine having an exhaust gas purifying device composed of a three-way catalyst arranged in the exhaust pipe, the mean value of the coefficient is corrected by the above predetermined value so that the resulting air-fuel ratio becomes richer than a theoretical ratio at the start of the air-fuel ratio feedback control.

REFERENCES:
patent: 4187812 (1980-02-01), Hosaka
patent: 4321903 (1982-03-01), Kondo
patent: 4437340 (1984-03-01), Csere
patent: 4466410 (1984-08-01), Sakakibara
patent: 4470395 (1984-09-01), Ohgami

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