Engine catalyst temperature estimating device and catalyst diagn

Details Engine catalyst temperature estimating device and catalyst diagn Engine catalyst temperature estimating device and catalyst diagn

1996-10-23

1998-03-24

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60276, 731181, F01N 320, G01K 1300

Patent

active

057299714

ABSTRACT:
The suitability of diagnosing deterioration of a catalyst which purifies engine exhaust is determined based on estimated catalyst temperature. A value depending on condensation in the catalyst, and a value corresponding to a state without condensation, are respectively set as a reference heat amount for a cold start and a hot start. A catalyst temperature during steady state running condition of the engine is also computed based on the engine running conditions. The heat amount given by the exhaust to the catalyst is computed from this catalyst temperature and the engine intake air volume. When the total heat amount given to the catalyst after engine startup is equal to or less than the reference heat amount, a catalyst temperature estimated value is set to a fixed value. In all other cases, the catalyst temperature estimated value is calculated by a first order delay equation having catalyst temperature during steady running conditions as a parameter. In this way, the catalyst temperature is estimated with high precision.

REFERENCES:
patent: 5303168 (1994-04-01), Cullen et al.
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5526643 (1996-06-01), Mukaihira et al.
patent: 5600947 (1997-02-01), Cullen

Affiliated with

Also associated with

Rating

Engine catalyst temperature estimating device and catalyst diagn does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Engine catalyst temperature estimating device and catalyst diagn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Engine catalyst temperature estimating device and catalyst diagn will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2280947