Fuel control system for an internal combustion engine

Details Fuel control system for an internal combustion engine Fuel control system for an internal combustion engine

1991-05-31

1992-06-30

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

36443111, F02D 4122

Patent

active

051253844

ABSTRACT:
A fuel control system for an internal combustion engine calculates a first air-fuel ratio based on the output of an air-flow sensor and the injection time of an injector, a second air-fuel ratio based on the suction air quantity from outputs of a throttle opening degree sensor and an engine revolution sensor, and on the injection time of the injector, and a third air-fuel ratio based on the output of an oxygen concentration sensor. A malfunction determiner detects a malfunction of a sensor by comparing the calculated values of the three ratios, and specifies the abnormal sensor when the calculated value based thereon disagrees with those of the other sensors. The throttle opening degree sensor can be replaced with a boost pressure sensor.

REFERENCES:
patent: 4572143 (1986-02-01), Umesaki et al.
patent: 4615321 (1986-10-01), Haefner et al.
patent: 4780826 (1988-10-01), Nakano et al.

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