Method and arrangement for obtaining an evaluation value for the

Details Method and arrangement for obtaining an evaluation value for the Method and arrangement for obtaining an evaluation value for the

1992-11-25

1993-10-26

Kamen, Noah P.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F07N 320

Patent

active

052555151

ABSTRACT:
The invention is directed to a method for obtaining a value for evaluating the performance loss of a catalytic converter with the aid of a forward signal of a forward gas probe mounted forward of the catalytic converter and a rearward signal of a rearward gas probe mounted rearward of the catalytic converter, the catalytic converter being connected to an internal combustion engine. The method includes the steps of: carrying out the method during the steady-state operation of the engine; multiplying the forward signal and the rearward signal with each other to form a plurality of products; averaging the products over a plurality of oscillations of the forward signal to obtain a mean value; and, utilizing the mean value as a value for evaluating the performance loss of the catalytic converter. This correlation method can be varied in different ways and especially in that the forward-probe signal is correlated without or with phase shift with the rearward-probe signal. A cross-correlation factor or the real or imaginary component of an orthogonal correlation or other correlation values are obtained in dependence upon the nature of the correlation. These correlation values are used for evaluating the performance loss of the catalytic converter. The evaluation of the performance loss of the catalytic converter with the aid of these correlation values is very significantly more reliable than the evaluation with the aid of amplitudes or amplitude mean values of the probe signals.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.

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