Method and electronic control unit for diagnosing a...

Power plants – Internal combustion engine with treatment or handling of... – Having sensor or indicator of malfunction – unsafeness – or...

Reexamination Certificate

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C060S274000, C060S276000, C060S285000, C073S118040, C123S674000

Reexamination Certificate

active

07131261

ABSTRACT:
A method for diagnosing a catalytic converter (7), which is arranged in an exhaust-gas system (6) of an internal combustion engine (1) has the steps of: detecting the signal (USHK) of an exhaust-gas probe (9) downstream of the catalytic converter; forming a limit value model amplitude (AHKF) from at least one quantity (ML, n) which occurs upstream of the catalytic converter (7); forming a catalytic converter evaluation quantity (DKATI) whose value increases with increasing deviation of the amplitude (AHK) of the signal (USHK) from the limit value model amplitude (AHKF); evaluating the operability of the catalytic converter (7) on the basis of the catalytic converter evaluation quantity (DKATI); stopping the evaluation when an oxygen-dependent catalytic converter load (KATIN) exceeds or drops below a threshold value. The method is characterized in that the threshold value is pregiven in dependence upon the signal (USHK) of the exhaust-gas probe (9) rearward of the catalytic converter.

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patent: 6145302 (2000-11-01), Zhang et al.
patent: 6151888 (2000-11-01), Schneider et al.
patent: 6499291 (2002-12-01), Lang et al.

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