Method and system for estimating and controlling electrically he

Details Method and system for estimating and controlling electrically he Method and system for estimating and controlling electrically he

1995-07-05

1997-02-11

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60300, 60284, F01N 320

Patent

active

056009470

ABSTRACT:
A method and system for estimating and controlling the temperature of an electrically heated catalyst having a heating element disposed in an exhaust passage of an internal combustion engine. Mass air flow into the engine is sensed. A temperature at an inlet of the catalyst is first determined. Next, a steady-state temperature rise of the heating element is determined based on the catalyst inlet temperature. The steady-state temperature rise is converted into an instantaneous temperature rise having a time constant based on the sensed mass air flow. A total catalyst temperature of the catalyst is then determined based on the catalyst inlet temperature and the instantaneous temperature rise. Finally, the heating element of the electrically heated catalyst is controlled based on the total catalyst temperature.

REFERENCES:
patent: 4656829 (1987-04-01), Creps et al.
patent: 5184463 (1993-02-01), Becker et al.
patent: 5224335 (1993-07-01), Yoshizaki
patent: 5257501 (1993-11-01), Wataya
patent: 5261230 (1993-11-01), Yuuki et al.
patent: 5303168 (1994-04-01), Cullen et al.
patent: 5323607 (1994-06-01), Tanaka et al.
patent: 5385017 (1995-01-01), Harada
patent: 5414994 (1995-05-01), Cullen et al.
patent: 5444976 (1995-08-01), Gonze

Affiliated with

Also associated with

Rating

Method and system for estimating and controlling electrically he 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 system for estimating and controlling electrically he, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for estimating and controlling electrically he will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-334526