Air/fuel ratio control system for an internal combustion engine

Details Air/fuel ratio control system for an internal combustion engine Air/fuel ratio control system for an internal combustion engine

1980-05-28

1982-11-16

Cox, Donald B.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02B 300

Patent

active

043590292

ABSTRACT:
Disclosed is an air/fuel control system for an internal combustion engine which selectively carries out open loop control and feedback control in which the air/fuel ratio is controlled based on the sensed concentration of an exhaust gas component. The system has a means for generating a variable reference signal corresponding to an exhaust gas sensor output and a means for measuring a period after the air-fuel mixture becomes rich and for generating a signal for switching control operation from feedback control to open loop control. The latter means clears the measured period responsive to interrupting feedback control after the expiration of a given period. This effectively prevents control operation from switching too frequently between feedback control and open loop control.

REFERENCES:
patent: 4170965 (1979-10-01), Aono
patent: 4244340 (1981-01-01), Herth
patent: 4266519 (1981-05-01), Nurimatsu

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