Abnormality-detecting device for internal combustion engines

Details Abnormality-detecting device for internal combustion engines Abnormality-detecting device for internal combustion engines

1993-07-29

1995-03-14

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 320

Patent

active

053967666

ABSTRACT:
An abnormality-detecting device is provided for an internal combustion engine having first and second oxygen sensors arranged in the exhaust system at locations upstream and downstream of a catalytic converter. An ECU detects the degree of deterioration of the catalytic converter, based on an output from the second oxygen sensor, and sets a reference value for determining an abnormality in the engine, based on the detected degree of deterioration of the catalytic converter. The ECU compares between the set reference value and a value based on an output from the first oxygen sensor, and determines the abnormality in the engine, based on the result of the comparison. Upon detection of the abnormality, an LED is actuated to issue an alarm.

REFERENCES:
patent: 5018348 (1991-05-01), Durschmidt
patent: 5069035 (1991-12-01), Kayanuma

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