Adaptive time window to synchronize pre- and post-catalyst oxyge

Details Adaptive time window to synchronize pre- and post-catalyst oxyge Adaptive time window to synchronize pre- and post-catalyst oxyge

1997-01-21

1999-11-02

Look, Edward K.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60277, 123691, 701109, F01N 300

Patent

active

059747862

ABSTRACT:
A system and method for monitoring efficiency of a catalytic converter count switches of at least one upstream sensor interposed the engine and the converter and count switches of a downstream sensor, interposed the converter and atmosphere, during a definite time period after a switch of the at least one upstream sensor to account for propagation delay of exhaust gases traveling between the at least one upstream and downstream sensor. Upstream sensor switches may optionally be counted only if predetermined entry conditions are satisfied while downstream switches occurring during respective definite time periods after an upstream switch are counted without regard to the entry conditions. A switch ratio based on the number of switches of the at least one upstream sensor and switches of the downstream sensor is used to monitor conversion efficiency of the catalyst. The system and method may include selecting a current air flow range from a plurality of air flow ranges and associating sensor switches and/or switch ratios with corresponding air flow ranges to compensate for the propagation delay. In inferred sensor signal base on dual upstream sensors may be used to trigger the definite time periods and calculate the switch ratio(s).

REFERENCES:
patent: 5077970 (1992-01-01), Hamburg
patent: 5357753 (1994-10-01), Wade
patent: 5365216 (1994-11-01), Kotwicki et al.
patent: 5385016 (1995-01-01), Zimlich et al.
patent: 5544481 (1996-08-01), Davey et al.
patent: 5644912 (1997-07-01), Kawamura

Affiliated with

Also associated with

Rating

Adaptive time window to synchronize pre- and post-catalyst oxyge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adaptive time window to synchronize pre- and post-catalyst oxyge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive time window to synchronize pre- and post-catalyst oxyge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2120465