Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1995-10-27
1996-11-26
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
60276, F02D 4114
Patent
active
055774881
ABSTRACT:
An air-fuel ratio sensor deterioration-detecting system for an internal combustion engine includes a catalytic converter arranged in the exhaust system, first and second air-fuel ratio sensors arranged in the exhaust system at respective locations upstream and downstream of the catalytic converter, and an ECU which calculates a value of a first control parameter, based on an output from the second air-fuel ratio sensor, and executes air-fuel ratio feedback control, based on the calculated value of the first control parameter. A value of a second control parameter to be used for calculating the value of the first control parameter is calculated based on the output from the second air-fuel ratio sensor. Whether the second air-fuel ratio sensor is deteriorated is determined based on the output from the second air-fuel ratio sensor. A value of at least one of the first and second control parameters is increased when a variation in the output from the second air-fuel ratio sensor is small during execution of the air-fuel ratio feedback control, and it is determined that the second air-fuel ratio sensor is deteriorated when the variation in the output from the second air-fuel ratio sensor is continuously small over a predetermined time period after the value of the at least one of the first and second control parameters has been increased.
REFERENCES:
patent: Re33942 (1992-06-01), Katsuno et al.
patent: 5182907 (1993-02-01), Kuroda et al.
Fujimoto Sachito
Hachiro Toshitaka
Kawaguchi Hiroshi
Sato Ryuji
Tsutsumi Kojiro
Argenbright Tony M.
Honda Giken Kogyo Kabushiki Kaisha
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