Power plants – Internal combustion engine with treatment or handling of... – Having means analyzing composition of exhaust gas
Patent
1996-02-02
1998-03-17
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Having means analyzing composition of exhaust gas
60277, 60284, F01N 328
Patent
active
057273839
ABSTRACT:
An exhaust pipe of an internal combustion engine is equipped with a three-way catalytic converter. Provided upstream and downstream the converter are an A/F sensor and a downstream O2 sensor, respectively. A CPU executes air-fuel feedback control according to the readings from the A/F sensor. When the period of air-fuel ratio inversion by the downstream O2 sensor has exceeded a predetermined time, the CPU determines that the three-way catalytic converter is activated. At that point, the CPU estimates the quantity of heat required from the start-up of the engine up to catalyst activation. The quantity of heat is obtained by accumulating the intake air quantity from the start of the engine up to catalyst activation (i.e., accumulated intake air quantity). Given the accumulated quantity of heat calculated, the CPU determines accordingly whether the three-way catalytic converter has deteriorated.
REFERENCES:
patent: 5154055 (1992-10-01), Nakens et al.
patent: 5261230 (1993-11-01), Yuuki et al.
patent: 5526643 (1996-06-01), Mukaihira
patent: 5606855 (1997-03-01), Tomisawa
Iida Hisashi
Nakayama Masaaki
Yamashita Yukihiro
Hart Douglas
Nippondenso Co. Ltd.
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