Air-fuel ratio control circuit for an internal combustion engine

Details Air-fuel ratio control circuit for an internal combustion engine Air-fuel ratio control circuit for an internal combustion engine

1983-03-15

1984-07-31

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02M 700, F02M 718

Patent

active

044623666

ABSTRACT:
An air-fuel ratio control circuit for an internal combustion engine comprising a low-pass filter, a hysteresis type comparator, and delay timer, wherein output signals from an exhaust gas sensor are transmitted through the low-pass filter to the hysteresis type comparator and then to the delay timer. A pulse motor for controlling an air-fuel ratio is driven at high speeds for a specified period of time determined by the delay timer in either forward or reverse direction which is determined by the output of the comparator at each time when the output of the comparator is inverted and is driven at low speeds after the specified period of time has elapsed, wherein the time constant of the low-pass filter is set longer than the delay time of the delay timer.

REFERENCES:
patent: 4345562 (1982-08-01), Drews et al.
patent: 4363306 (1982-12-01), Sone et al.
patent: 4380985 (1983-04-01), Otsuka et al.
patent: 4393841 (1983-07-01), Drews et al.
patent: 4399790 (1983-08-01), Kataoka
patent: 4399792 (1983-08-01), Otsaka et al.
patent: 4408584 (1983-10-01), Tabuharu et al.
patent: 4411236 (1983-10-01), Matsui et al.
patent: 4413471 (1983-11-01), Hattori et al.

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