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    • 25. 发明专利
    • EXHAUST EMISSION CONTROL DEVICE
    • JPH0893457A
    • 1996-04-09
    • JP23539294
    • 1994-09-29
    • NIPPON SOKENTOYOTA MOTOR CORP
    • YAMADA JUNKANEHARA KENJIYOSHINAGA TORUHIRATA TOSHIYUKI
    • F01N3/20B01J23/44F02D41/14
    • PURPOSE: To keep the high controlling efficiency irrespective of the deterioration of the catalyst by correcting the feedback control factor so that the controlled air-fuel ratio may be on the rich side according to the deterioration of the O2 storage function of a catalytic converter. CONSTITUTION: The output signals of first and second O2 sensors 3, 4, an intake tube pressure sensor 5, a speed sensor 6, etc., which are arranged in the upstream and downstream of an exhaust gas control catalytic converter 2 containing palladium are received by an ECU 8. The air-fuel ratio correction factor is feedback controlled based on the signal of the O2 sensor 3, and the rich skip amount and the lean skip amount of the air-fuel ratio correction factor are increased/decreased based on the signal of the O2 sensor 4. The deterioration of the converter 2 is judged from the fluctuation width and the fluctuation period of the signal of the O2 sensor 4, and in the case of the judgement for the deterioration, the correction factor of the comparative voltage in increasing/decreasing the rich skip amount and the lean skip amount is increased, the comparative voltage is increased, and the air-fuel ratio is corrected to the rich side.