Method and arrangement for monitoring the performance loss of an

Details Method and arrangement for monitoring the performance loss of an Method and arrangement for monitoring the performance loss of an

1992-11-25

1995-03-21

Regan, Maura K.

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

123688, 73 2332, G01N 2700

Patent

active

053999614

ABSTRACT:
The invention relates to an arrangement for monitoring the performance loss of an oxygen probe arranged forward of a catalytic converter. The oxygen probe supplies an actual voltage U.sub.-- ACT for a lambda controller for an internal combustion engine and the arrangement includes: a computation unit for computing the time-dependent mean value .vertline.U.sub.-- ACT-U.sub.-- DES .vertline. of the actual voltage U.sub.-- ACT from a desired voltage U.sub.-- DES; and, an evaluation unit for determining the performance loss of the oxygen probe on the basis of the time-dependent mean value. A simple method sequence which can be carried out with the above arrangement includes the step of deeming the probe to have an impermissibly high performance loss when the above-mentioned mean value drops below a threshold value. However, the quotient is preferably formed between the above-mentioned mean value and the mean value .vertline.FR.sub.-- ACT-FR.sub.-- DES.vertline. and the probe is deemed to have too great a performance loss when this quotient drops below a threshold value. The variable .vertline.FR.sub.-- ACT-FR.sub.-- DES.vertline. is the amount of the deviation of the output signal FR.sub.-- ACT of the lambda controller from a desired value FR.sub.-- DES. In this procedure, a very good signal
oise ratio is obtained which permits an especially reliable evaluation of the performance loss of the probe.

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