Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1995-09-29
1996-11-19
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
123519, F02D 4100, F02M 3302
Patent
active
055752675
ABSTRACT:
A fault diagnosis apparatus for detecting a fault in a fuel evaporative emission suppressing system comprises an electronic control unit. When fault diagnosis execution conditions are fulfilled, the electronic control unit stores an average of integral term values for air-fuel ratio feedback control, operating position of an idling speed control valve, and engine speed, and then actuates a purge control valve of the suppressing system so that the valve opens. In a predetermined time period after the actuation of the purge control valve, the integral term average and the like are stored again. If any changes of the integral term average and other values caused by the actuation of the purge control valve are detected, the suppressing system is concluded to be normal. If no changes are detected, on the other hand, the suppressing system is concluded to be faulty.
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Hashimoto Toru
Kamura Hitoshi
Kanao Hidetsugu
Matsumoto Takuya
Miyake Mitsuhiro
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Nelli Raymond A.
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