Method and system for controlling the mixture air-to-fuel ratio

Details Method and system for controlling the mixture air-to-fuel ratio Method and system for controlling the mixture air-to-fuel ratio

1976-06-02

1978-08-01

Feinberg, Samuel

Internal-combustion engines

Noncompression

123119EC, F02B 300

Patent

active

041036492

ABSTRACT:
A closed loop air-to-fuel ratio control system having an oxygen responsive sensor and a feedback circuit is disclosed. The sensor is disposed in an exhaust passage to produce a voltage indicative of the oxygen concentration in the exhaust gas. This voltage is integrated in the feedback circuit to cause the mixture air-to-fuel ratio to be corrected in response thereto. During specific engine conditions such as engine idling and low temperature of the exhaust gas, the integration is stopped to thereby switch off the closed loop to an open loop. The engine, on this occasion, can be supplied with the air-fuel mixture of an arbitrary ratio irrespective of the oxygen concentration in the exhaust gas, resulting in the optimum air-to-fuel control well-matched to the engine conditions.

REFERENCES:
patent: 3875907 (1975-04-01), Wessel et al.

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