Misfiring detecting method and apparatus

Details Misfiring detecting method and apparatus Misfiring detecting method and apparatus

1992-01-13

1994-07-26

Raevis, Robert

Measuring and testing

Test stand

For engine

G01M 1500

Patent

active

053318480

ABSTRACT:
A method and apparatus capable of detecting the occurrence of misfiring in an internal combustion engine with high reliability over a wide engine operation range with a simplified structure. Starting from a fact that an engine acceleration changes in dependence upon combustion states in the engine cylinders, a ratio between two periods before and after a predetermined crank angle reference position is successively determined. An angular acceleration of the crankshaft is then determined on the basis of a difference between a current ratio and a preceding ratio for each cylinder. Subsequently, a change in the crankshaft acceleration is determined for comparison with a predetermined value at every ignition timing for each cylinder. If the change exceeds the predetermined value, it is determined the occurrence of misfiring. The method can be carried out by making use of only an output signal of a crank angle sensor which is usually utilized for ignition timing control of the engine.

REFERENCES:
patent: 3679894 (1972-07-01), Smith
patent: 3972230 (1976-08-01), Hanson et al.
patent: 4123935 (1978-11-01), Maringer
patent: 4295363 (1981-10-01), Buck et al.
patent: 4532592 (1985-07-01), Citron et al.
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5088318 (1992-02-01), Osawa
patent: 5095742 (1992-03-01), James et al.
SAE-PAP, "Methods of On-Board Misfire Detection" Gunther Plapp et al., pp. 9-20.

Affiliated with

Also associated with

Rating

Misfiring detecting method and 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 Misfiring detecting method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Misfiring detecting method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1047145