System for monitoring performance of HC sensors for internal com

Details System for monitoring performance of HC sensors for internal com System for monitoring performance of HC sensors for internal com

1991-09-05

1993-02-02

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 731181, 123674, 123688, 123691, 123693, F02D 4114

Patent

active

051829070

ABSTRACT:
A system which monitors the performance of at least one HC sensor arranged in an exhaust passage of and internal combustion engine. According to a first aspect of the invention, a value of output from the at least one HC sensor is stored, which is assumed when the fuel supply to the engine is cut off, and a value of output from the at least one HC sensor is corrected by the stored value. According to a second aspect of the invention, the value of output from the at least one HC sensor assumed when the fuel supply to the engine is cut off is compared with a predetermined value, and if the former exceeds the latter, it is judged that there is abnormality in the at least one HC sensor.

REFERENCES:
patent: 4789939 (1988-12-01), Hamburg
patent: 4819427 (1989-04-01), Nagai
patent: 4941318 (1990-07-01), Matsuoka
patent: 5077970 (1992-01-01), Hamburg

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