Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1996-09-25

1997-10-14

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4100

Patent

active

056761198

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine has an exhaust gas component concentration sensor having a sensor element and arranged in the exhaust system of the engine, for detecting concentration of a predetermined component present in exhaust gases emitted from the engine. An ECU controls the air-fuel ratio of an air-fuel mixture supplied to the engine, based on results of comparison between an output value from the sensor and a predetermined reference value, and detects deterioration of the exhaust gas component concentration sensor, based on the output value from the sensor. Engine operating condition sensors detect operating conditions of the engine. It is determined whether or not the engine is in a predetermined engine operating condition in which the sensor element temperature of the exhaust gas component concentration sensor lowers, based on outputs from the engine operating condition sensors. Detection of deterioration of the sensor is inhibited over a predetermined time period after the engine leaves the predetermined operating condition.

REFERENCES:
patent: 5340462 (1994-08-01), Suzuki
patent: 5396765 (1995-03-01), Maruyama et al.
patent: 5433185 (1995-07-01), Toyoda
patent: 5485382 (1996-01-01), Seki et al.
patent: 5505183 (1996-04-01), Sinha et al.
patent: 5526798 (1996-06-01), Seki
patent: 5533332 (1996-07-01), Uchikawa
patent: 5575266 (1996-11-01), Iida

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