Air-fuel ratio control system

Internal-combustion engines – Charge forming device – Having fluidic logic control means

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123489, F02D 3500

Patent

active

044022930

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having an intake passage, an exhaust passage, an air-fuel mixture supply, on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by said air-fuel mixture supply, a dither signal generating circuit for producing a periodical dither signal having a constant wave pattern, a shift control circuit for shifting the level of the center of the dither signal, a driving circuit for producing a driving output according to the dither signal, and an O.sub.2 sensor for detecting the concentration of oxygen in exhaust gases passing through the exhaust passage. The system is provided with a device for detecting a transient state of the engine operation, and a control circuit including an integrating circuit connected to the O.sub.2 sensor and a square wave generating circuit for generating square pulses according to the integration output of the integrating circuit for driving the electromagnetic valve. A switching circuit is provided for connecting the O.sub.2 sensor to the control circuit and disconnecting the shift control circuit from the O.sub.2 sensor in dependency on the output signal of the device for detecting the transient state. Thus, in the transient state, the air-fuel ratio is controlled by the integration output signal of the control circuit, whereby the air-fuel ratio may be quickly controlled to the stoichiometric air-fuel ratio.

REFERENCES:
patent: 4029061 (1977-06-01), Asano
patent: 4108121 (1978-08-01), Minami et al.
patent: 4214558 (1980-07-01), Nishioka et al.
patent: 4320730 (1982-03-01), Takada et al.

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