Method and system to control the mixture air-to-fuel ratio

Details Method and system to control the mixture air-to-fuel ratio Method and system to control the mixture air-to-fuel ratio

1978-04-27

1979-12-18

Cox, Ronald B.

Internal-combustion engines

Noncompression

123119EC, F02B 300, F02M 700

Patent

active

041788842

ABSTRACT:
A closed-loop air-to-fuel ratio control system having an oxygen responsive sensor and a feedback circuit. 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 with the integration constant predetermined to vary with respect to the time. Air-to-fuel ratio of the mixture to be supplied to the engine is corrected to the predetermined air-to-fuel ratio in response to the integrated voltage. With the integration constant decreasing with respect to the time, the air-to-fuel ratio is speedily returned to the predetermined ratio.

REFERENCES:
patent: 3759232 (1973-09-01), Wahl
patent: 3782347 (1974-01-01), Schmidt
patent: 3900012 (1975-08-01), Wahl
patent: 3903853 (1975-09-01), Kizler
patent: 3916848 (1975-11-01), Schmidt
patent: 4019470 (1977-04-01), Asano
"Electronic Closed Loop Controls for Automobiles", John F. Cassidy, Jr., from Automotive Electronics, 2/74.

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