Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1991-09-05
1993-06-08
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
731181, 123688, 123691, 123694, F01N 320
Patent
active
052168824
ABSTRACT:
A system for detecting deterioration of at least one HC sensor arranged in the exhaust passage of an internal combustion engine. There is calculated a difference between an actual value of output from the HC sensor and a predetermined reference value set in accordance with at least one parameter indicative of operating conditions of the engine, while the engine is in a predetermined operating condition. The difference is compared with a predetermined value. It is judged that there is deterioration in the HC sensor when the difference exceeds the predetermined value. In another aspect of the invention, the actual value of output from the HC sensor is corrected by a value of output from the HC sensor detected and stored when the fuel supply to the engine is cut off. Then, there is calculated a difference between the corrected actual value and the predetermined reference value.
REFERENCES:
patent: 3630072 (1971-12-01), Traver
patent: 4079714 (1978-03-01), Saito
patent: 4819427 (1989-04-01), Nagai
Iwata Yoichi
Kuroda Shigetaka
Hart Douglas
Honda Giken Kogyo Kabushiki Kaisha
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