Air-fuel ratio control system with altitude compensator
AssigneeToyo Kogyo Co., Ltd.
InventorsKatsuhiko Yokooku, Katsuyoshi Iida
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Abstract
An automobile air-fuel control system is incorporated with an altitude compensator in order to minimize an excessive enrichment of an air-fuel mixture which would occur when the engine is operated at a high altitude under a high load operating condition. This altitude compensator is constituted by a delay circuitry operable to delay the timing at which the supply of bleed air for leaning the mixture is interrupted when the engine is operated at a high altitude under the high loaded condition.
Claims5
An air-fuel ratio control system for an internal combustion engine including a combustion chamber, a mixture intake passage means for supplying a combustible mixture to the combustion chamber, and exhaust passage means including a catalytic converter installed thereon between the engine and the atmosphere, said control system comprising a composition sensor provided on the exhaust passage means at a position between the engine and the catalytic converter for detecting the concentration of a particular component obtained in exhaust gases emitted from the engine, said concentration being a function of the air-fuel mixing ratio of the combustible mixture burned in the engine, a control unit receiving an output signal from the composition sensor and generating a control signal based on the output signal from the composition sensor, an actuator for regulating the air-fuel mixing ratio of the combustible mixture to be supplied to the combustion chamber in response to the control signal from the control unit, a high load compensator circuitry for bringing the actuator into a predetermined operative position for supplying a enriched combustible mixture to the combustion chamber in response to an occurance of a high load operating condition of the engine and irrespective of the application of the control signal to the actuator, and a delay circuitry operable in response to reduction in atomospheric pressure for delaying for a predetermined delay time the timing at which the actuator is brought into the predetermined operative position.
Dependencies are inferred from the claim text.