Control system for internal combustion engine equipped with exha

Details Control system for internal combustion engine equipped with exha Control system for internal combustion engine equipped with exha

1994-12-23

1996-09-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 328

Patent

active

055579299

ABSTRACT:
A control system for an internal combustion engine equipped with a catalytic converter including an exhaust gas purifying catalyst. The control system comprises a catalyst deterioration diagnosing device for diagnosing the deterioration condition of the catalyst. The operation of the catalyst deterioration diagnosing device is avoided when a first frequency at which an engine operating condition shifts to a range for stopping fuel supply to a fuel injector valve becomes larger by not less than a predetermined value than a second frequency at which the engine operating condition shifts to a range for increasing the amount of the fuel supply, thereby preventing the catalyst deterioration diagnosis from being carried out under a condition in which the catalyst is subjected to a high temperature and lean (air-fuel ratio) atmosphere.

REFERENCES:
patent: 5337558 (1994-08-01), Komatsu
patent: 5357754 (1994-10-01), Ogawa

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