Air-fuel ratio control system for an internal combustion engine
Patent
·
OSTI ID:5531804
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.
- Assignee:
- Toyo Kogyo Co., Ltd.
- Patent Number(s):
- US 4397279
- OSTI ID:
- 5531804
- Country of Publication:
- United States
- Language:
- English
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