Method and arrangement for determining the state of deterioratio

Details Method and arrangement for determining the state of deterioratio Method and arrangement for determining the state of deterioratio

1992-04-17

1994-04-19

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

123672, G01M 1900

Patent

active

053035801

ABSTRACT:
The invention is directed to a method of determining the performance loss of a catalyzer by using a deterioration variable indicative of this performance loss. The catalyzer is affected by operating conditions and is mounted in the exhaust gas flow of an internal combustion engine having a lambda controller operated to provide a two-level response. The method includes the steps of: obtaining a measurement signal from a lambda probe mounted forward of the catalyzer and a test signal from a lambda probe mounted rearward of the catalyzer; forming a relationship between the measurement and the test signals; measuring values of operating variables which affect oxygen storage processes in the catalyzer; and, correcting the deterioration variable based on the values of the operating variables thereby reducing the influence of the operating conditions on the deterioration variable. Because the deterioration variable can be corrected in the manner described above, this variable can be reliably determined for many different operating conditions rather than only for a few selected operating conditions.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 4007589 (1977-02-01), Neidhard et al.
patent: 5154055 (1992-10-01), Nakane et al.
patent: 5159810 (1992-11-01), Grutter et al.

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