System for compensating an oxygen sensor in an emission control

Details System for compensating an oxygen sensor in an emission control System for compensating an oxygen sensor in an emission control

1986-02-14

1988-05-17

Cox, R. B.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02M 724, F01N 322

Patent

active

047443448

ABSTRACT:
A system has an oxygen sensor, a proportion and integration circuit responsive to the output of the oxygen sensor for producing a PI signal at a constant of proportionality and a constant of integration and for controlling the air-fuel ratio of mixture to stoichiometry. The period of the output of the oxygen sensor is compared with a reference value by a comparator. When the period is longer than the reference value, the constants of proportionality and integration are changed so as to correct the deviation of the air-fuel ratio from stoichiometry.

REFERENCES:
patent: 4121548 (1978-10-01), Hattori
patent: 4177787 (1979-12-01), Hattori
patent: 4364227 (1982-12-01), Yoshida
patent: 4502444 (1985-03-01), Rubbo
patent: 4558677 (1985-12-01), Hara
patent: 4603670 (1986-08-01), Bertsch
patent: 4612892 (1986-09-01), Iwanaga
patent: 4624232 (1986-11-01), Saito

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