Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1979-07-20
1981-02-24
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60285, 123440, 123489, F01N 315
Patent
active
042519900
ABSTRACT:
An air-fuel ratio control system comprises a first oxygen concentration detector arranged upstream of a three-way catalyst for purifying the exhaust gas in the exhaust system of an internal combustion engine, a second oxygen concentration detector arranged downstream of the three-way catalyst, a discrimination circuit for detecting and discriminating a specific operating condition of the internal combustion engine in response to a signal representing operating factors of the internal combustion engine such as the amount of intake air and vehicle speed, and a change-over circuit impressed with the signals from the first and second oxygen concentration detectors. The change-over circuit produces selectively the detection signal of the second oxygen concentration detector in response to the output signal of the discrimination circuit only when the discrimination circuit detects a predetermined operating condition of the internal combustion engine, and the detection signal of the first oxygen concentration detector when the internal combustion engine is under the other operating conditions.
REFERENCES:
patent: 3782347 (1974-01-01), Schmidt
patent: 3875907 (1975-04-01), Wessel
patent: 3939654 (1976-02-01), Creps
patent: 3990411 (1976-11-01), Toelle
patent: 4007589 (1977-02-01), Neidhard
patent: 4130095 (1978-12-01), Bowler
Norimatsu Hideaki
Tajima Masahiko
Hart Douglas
Nippondenso Co. Ltd.
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