High voltage ignition system monitoring circuit

Details High voltage ignition system monitoring circuit High voltage ignition system monitoring circuit

1990-03-01

1991-06-25

Wieder, Kenneth

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Coil

324399, F02P 1700

Patent

active

050270737

ABSTRACT:
In order to protect catalytic converters from damage caused by continued engine operation with a malfunctioning ignition system, a monitoring circuit checks current in the ignition coil primary winding. Primary winding current (i) is transformed by a measuring circuit (11) into a test primary voltage (U.sub.pr) which is fed to an evaluation circuit for comparison with ignition system supply voltage (U.sub.v) from the battery. During each primary current pulse, an instantaneous value is sampled, preferably during the earlier half of the pulse, and when the instantaneous test voltage (U.sub.pr) exceeds the supply voltage (U.sub.v) by more than a predetermined amount, the evaluation circuit (10) generates an error or malfunction indication. The ignition system can then be serviced before the catalytic converter is ruined.

REFERENCES:
patent: 4331921 (1982-05-01), Walker
patent: 4404616 (1983-09-01), Miyanaka et al.
patent: 4418375 (1983-11-01), Ober
patent: 4449100 (1984-05-01), Johnson et al.
patent: 4742306 (1988-05-01), Everett et al.
patent: 4851766 (1989-07-01), Shiobara et al.
patent: 4918389 (1990-04-01), Schleupen et al.

Affiliated with

Also associated with

Rating

High voltage ignition system monitoring circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High voltage ignition system monitoring circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High voltage ignition system monitoring circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1042795