Need-based method of heating a catalyst in the exhaust system of

Details Need-based method of heating a catalyst in the exhaust system of Need-based method of heating a catalyst in the exhaust system of

1994-07-07

1996-02-13

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, 60284, 60285, 60289, 60300, F01N 320

Patent

active

054903815

ABSTRACT:
A need-based method of heating a catalyst in the exhaust-gas system of an internal combustion engine, in which a converting power of the catalyst is determined and the catalyst is heated as a function of the converting power. Depending on the operating conditions of the internal combustion engine, different measures are undertaken for the heating of the catalyst. If the heating measures do not lead to the desired results within a predetermined time interval, a diagnostic function is started. As part of the diagnostic function, particularly effective heating measures are applied. If while using these measures a sufficient converting power of the catalyst is not obtained within a predetermined second time interval, it is assumed that the catalyst is damaged.

REFERENCES:
patent: 4165610 (1979-08-01), Iizuka et al.
patent: 4622809 (1986-11-01), Abthoff et al.
patent: 5191763 (1993-03-01), Yuuki
patent: 5216880 (1993-06-01), Aoki
patent: 5303548 (1994-04-01), Shimuzu

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