Method and system for detecting the misfire of an internal combu

Details Method and system for detecting the misfire of an internal combu Method and system for detecting the misfire of an internal combu

1991-08-21

1993-08-24

Harvey, Jack B.

Boots, shoes, and leggings

36443101, 364550, 123436, 324379, 731173, G01L 300

Patent

active

052394735

ABSTRACT:
A hybrid method and system are disclosed for the detection of internal combustion engine misfires. The method and system are capable of detecting misfires even at very low occurrence rates in real time with inexpensive analog and digital (i.e. hybrid) electronics suitable for use on-board a vehicle, thus satisfying current and proposed exhaust emission control regulations. The method and system exploit a measurement of engine crankshaft angular velocity in conjunction with hybrid electronic signal processing. Once the angular velocity signal is conditioned to minimize the effects of random error and external disturbances, four alternate computationally efficient methods may be used to extract information pertaining to individual cylinder torque productions. Two of the methods employ extremal samples of the estimated torque or velocity waveform to obtain a random torque nonuniformity index or metric. The other two methods utilize a transformation into the frequency domain after the input data is first sampled and windowed to substantially lower probability of error. All of the methods provide an M-dimensional torque non-uniformity vector of individual cylinder performance for each individual engine cycle. The non-uniformity vector represents a compact and efficient measurement to which statistical decision theory is applied.

REFERENCES:
patent: 3789816 (1974-02-01), Taplin et al.
patent: 4083234 (1978-04-01), Aono et al.
patent: 4197767 (1980-04-01), Leung
patent: 4292670 (1981-09-01), Reid et al.
patent: 4344140 (1982-08-01), Leung
patent: 4347571 (1982-08-01), Leung et al.
patent: 4357662 (1982-11-01), Schira et al.
patent: 4424709 (1984-01-01), Meier, Jr. et al.
patent: 4532592 (1985-07-01), Citron et al.
patent: 4539841 (1985-09-01), Schroeder et al.
patent: 4550595 (1985-11-01), Venema
patent: 4562818 (1986-01-01), Kohama et al.
patent: 4691288 (1987-09-01), Kay et al.
patent: 4697561 (1987-10-01), Citron
patent: 4800500 (1989-01-01), Tanaka
patent: 4843870 (1989-07-01), Citron et al.
patent: 4987770 (1991-01-01), Nanyoshi et al.

Affiliated with

Also associated with

Rating

Method and system for detecting the misfire of an internal combu 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 detecting the misfire of an internal combu, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for detecting the misfire of an internal combu will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-833749