Method and arrangement for simulating the dynamic performance of

Details Method and arrangement for simulating the dynamic performance of Method and arrangement for simulating the dynamic performance of

1992-04-17

1993-06-01

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 731181, F01N 320

Patent

active

052149153

ABSTRACT:
A method for simulating the time-dependent trace of the lambda value at the outlet of an exhaust gas catalyzer comprising measuring the air-mass flow inducted by the engine; computing the oxygen flow to the engine; determining the deviation .DELTA..lambda. of the lambda value forward of the catalyzer, the deviation being positive for a lean mixture and negative for a rich mixture; computing the oxygen partial flow flowing into the catalyzer; inputting the oxygen-storage capacity thresholds of the catalyzer; computing the simulated time-dependent trace of the lambda value at the outlet of the catalyzer, and comparing the simulated and the actual lambda values for correction of the thresholds and for an indication of catalyzer deterioration.

REFERENCES:
patent: 3962866 (1976-06-01), Neidhard et al.
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 5077970 (1992-01-01), Hamburg

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