Method and apparatus for discriminating operativeness/inoperativ

Details Method and apparatus for discriminating operativeness/inoperativ Method and apparatus for discriminating operativeness/inoperativ

1985-10-30

1987-07-07

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4122

Patent

active

046779558

ABSTRACT:
In an air-fuel ratio feedback control system for an engine having an air-fuel ratio sensor, operativeness/inoperativeness of the air-fuel ratio sensor is discriminated. An output signal of the air-fuel ratio sensor is compared and a difference thereof from a reference level is integrated for a predetermined internal of time. Integration value is compared with a discrimination reference so that a feedback control is disabled when the integration value does not attain the discrimination reference indicating inoperativeness of the air-fuel ratio sensor.

REFERENCES:
patent: 3916848 (1975-11-01), Schmidt
patent: 3938479 (1976-02-01), Oberstadt
patent: 4177787 (1979-12-01), Hattori et al.
patent: 4485786 (1984-12-01), Kashimura
patent: 4505246 (1985-03-01), Nakajima et al.
patent: 4512313 (1985-04-01), Tsuchida et al.

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