Method for monitoring the emission control system of a spark ign

Power plants – Internal combustion engine with treatment or handling of... – Methods

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60276, 60277, 60285, 123688, 123703, F01N 300

Patent

active

06105366&

ABSTRACT:
An emission control system is monitored by measuring time periods during which the signal of a post-catalyst lambda probe lies below or above an engine speed/load dependent threshold value. The measurements are weighted with an engine speed/load dependent value and subsequently summed so that a total reference time period, which constitutes a measure of the additionally emitted pollutants, can be related to the overall operating time period. If the ratio exceeds a predefined value, a faulty function of the pre-catalyst lambda probe is diagnosed. The method permits the onboard diagnosis of the lambda control of the catalytic emission treatment system.

REFERENCES:
patent: 5117631 (1992-06-01), Moser
patent: 5214915 (1993-06-01), Schneider et al.
patent: 5673555 (1997-10-01), Achleitner
patent: 5836153 (1998-11-01), Staufenberg et al.
patent: 5862661 (1999-01-01), Zhang et al.

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