Exhaust temperature sensor malfunction detection apparatus

Details Exhaust temperature sensor malfunction detection apparatus Exhaust temperature sensor malfunction detection apparatus

2004-09-27

2008-08-26

Cheung, Mary (Department: 3694)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

Reexamination Certificate

active

07418322

ABSTRACT:
In an exhaust cleaning system including a DPF in exhaust passages, a pair of temperature sensors is disposed upstream and downstream the filter to detect upstream and downstream exhaust temperatures. An electronic control unit estimates a downstream exhaust temperature from the actual upstream exhaust temperature when an engine is in a predetermined condition such as a cold-start condition or a high speed and high load condition, in which no catalytic reaction heat is generated in the DPF. The control unit then compares the estimated downstream temperature with the actually detected downstream temperature, and determines an exhaust temperature senor malfunction if the difference between the compared temperatures are large.

REFERENCES:
patent: 5107246 (1992-04-01), Mogaki
patent: 5211010 (1993-05-01), Hirota
patent: 5388454 (1995-02-01), Kuroda et al.
patent: 5848381 (1998-12-01), Ishii et al.
patent: 5995887 (1999-11-01), Hathaway et al.
patent: 6131446 (2000-10-01), Schnaibel et al.
patent: 6684154 (2004-01-01), Isobe et al.
patent: 1-216009 (1989-08-01), None
P0546—Exhaust Gas Temperature Sensor Circuit Malfunction (High Input), available @ http://www.fastwrx.com/p0exgastesec.html, last accessed Apr. 13, 2008.

Affiliated with

Also associated with

Rating

Exhaust temperature sensor malfunction detection apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exhaust temperature sensor malfunction detection apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exhaust temperature sensor malfunction detection apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4017088