Combustion detecting apparatus for internal combustion engine

Details Combustion detecting apparatus for internal combustion engine Combustion detecting apparatus for internal combustion engine

1992-02-12

1993-07-27

Myracle, Jerry W.

Measuring and testing

Test stand

For engine

324459, G01M 1500

Patent

active

052302407

ABSTRACT:
A combustion detecting apparatus for an internal combustion engine capable of discriminatively detecting the state of combustion, normal combustion or abnormal combustion such as misfiring, from each other. By applying a voltage of positive polarity to a spark plug for each engine cylinder, an ion current of negative polarity, which is generated upon combustion of a mixture in the cylinder, is detected. Subsequently, the detected ion current signal of negative polarity is transformed to a signal of positive polarity which is then subjected to waveform shaping by using comparators to obtain an ion current detection output signal which is utilized in making decision as to occurrence of misfiring. By making use of the ion current of negative polarity, a high signal level is realized to detect the state of combustion with high reliability even in a high speed or under a heavy load of the engine. By providing a low pass filter which can pass only a shaped signal component having a duration longer than a predetermined time, noise components usually of a short duration can be eliminated to improve combustion detection.

REFERENCES:
patent: 4762106 (1988-08-01), Blauhut
patent: 4987771 (1991-01-01), Iwata
patent: 5067462 (1991-11-01), Iwata et al.
patent: 5178001 (1993-01-01), Ikeuchi et al.
MTZ, Band 51, 1990, Heft 3, Seiten 118-112.

Affiliated with

Also associated with

Rating

Combustion detecting apparatus for internal combustion engine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Combustion detecting apparatus for internal combustion engine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Combustion detecting apparatus for internal combustion engine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2336967