Method and arrangement for determining the performance loss of a

Details Method and arrangement for determining the performance loss of a Method and arrangement for determining the performance loss of a

1992-04-17

1993-12-07

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

60277, G01M 1500

Patent

active

052674720

ABSTRACT:
The invention relates to a method for determining the performance loss of a catalyzer receiving the exhaust gas of a lambda-controlled internal combustion engine and includes the steps of: measuring lambda values forward and rearward of the catalyzer to obtain forward and rearward lambda values, respectively; when a control oscillation of the forward lambda value makes a transition from rich to lean or from lean to rich, determining if the rearward lambda value makes a transition corresponding to the transition of the forward lambda value, and if this correspondence takes place, then carrying out the following additional steps: determining the gas mass flow flowing through the catalyzer; computing the time integral of the product of the gas mass flow and the forward lambda value; computing the time integral of the product of the gas mass flow and the rearward lambda value; and, as a measure of the performance loss of the catalyzer, utilizing either the difference between the integrals or the quotient of the integrals or the quotient of the difference and one of the integrals. The method of the invention affords the advantage that determinations are only undertaken when it is ensured that the catalyzer is entirely filled with oxygen or is completely emptied in advance of a measurement. This achieves well defined starting relationships. Furthermore, the advantage is provided that with the evaluations, gas-mass flows are considered which permits the storage capacity of the catalyzer for oxygen to be directly determined. This oxygen storage capacity is the variable decisive in the practice for determining the state of deterioration of the catalyzer.

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

Affiliated with

Also associated with

Rating

Method and arrangement for determining the performance loss of a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and arrangement for determining the performance loss of a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and arrangement for determining the performance loss of a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2009129