Alcohol sensor failure detection system for internal combustion

Details Alcohol sensor failure detection system for internal combustion Alcohol sensor failure detection system for internal combustion

1990-04-12

1991-04-16

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123 1A, 123489, 123494, 123575, 731173, F02D 4122

Patent

active

050073982

ABSTRACT:
In an alcohol sensor failure detection system for an internal combustion engine, a failure of an alcohol sensor is detected utilizing an air/fuel ratio dependent correction coefficient during a FEEDBACK control being executed to maintain an air/fuel ratio of an air/fuel mixture at a target value with a fuel supply amount which is corrected by the correction coefficient. The correction coefficient is variable between predetermined maximum and minimum values depending on a monitored air/fuel ratio of the air/fuel mixture. When the correction coefficient is retained to the maximum or minimum value for no less than a predetermined time, the failure of the alcohol sensor is determined.

REFERENCES:
patent: 4957087 (1990-09-01), Ota

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