Air-fuel ratio feedback control system

Details Air-fuel ratio feedback control system Air-fuel ratio feedback control system

1981-09-09

1983-05-31

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Fuel injection system

123491, 123440, 60276, F02D 500

Patent

active

043856136

ABSTRACT:
An air-fuel ratio feedback control system is disclosed in which a sensing output representing the oxygen concentration in the exhaust gas of an internal combustion engine is compared with a predetermined set value. The output of the comparator is integrated and the amount of fuel injection is corrected by being increased or decreased in accordance with the integration output having an increasing or decreasing polarity so as to control the air-fuel ratio at a stoichiometrical value. At the time of engine start, the air-fuel ratio feedback control is stopped, and this condition is held after engine start. Further, the holding function is cancelled by a signal representing the activation of the detection output of the oxygen sensor.

REFERENCES:
patent: 3949551 (1976-04-01), Eichler et al.
patent: 4040408 (1977-08-01), Kraus et al.
patent: 4096834 (1978-06-01), Norimatsu et al.
patent: 4100892 (1978-07-01), Asano
patent: 4252098 (1981-02-01), Tomczak et al.

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