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

1981-06-30

1983-08-09

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02M 716

Patent

active

043972799

ABSTRACT:
An air-fuel ratio control system for an automobile engine including a source of combustible air-fuel mixture on an intake passage and an exhaust gas purifying unit on an exhaust passage includes a composition sensor for generating an output signal indicative of the concentration of a particular component of exhaust gases flowing through the exhaust passage, a control unit for generating a control signal in dependence on the output signal, a pressure sensor for generating a pressure signal indicative of the pressure inside the intake passage, and an actuator operable in response to the control signal to adjust the air-fuel mixing ratio to a predetermined optimum value. The control unit is so designed to fix the duty ratio of the control signal at a mean value of the highest and lowest values of the duty ratio of the previous control signal if it has attained a generally identical value two or more times consecutively.

REFERENCES:
patent: 3895611 (1975-07-01), Endo et al.
patent: 4111171 (1978-09-01), Aono et al.
patent: 4122811 (1978-10-01), Bowler et al.
patent: 4203394 (1980-05-01), Aono et al.
patent: 4224910 (1980-09-01), O'Brien
patent: 4237839 (1980-12-01), Veno et al.
patent: 4357828 (1982-11-01), Nakano

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