System for detecting misfires in an internal combustion engine

Details System for detecting misfires in an internal combustion engine System for detecting misfires in an internal combustion engine

1992-06-05

1993-11-23

Williams, Hezron E.

Measuring and testing

Vehicle chassis

Steering

36443108, 123419, G01M 1500, F02D 4114, F02P 1700

Patent

active

052633659

ABSTRACT:
A system for detecting multiple misfires and for allocating misfires to cylinders for detected multiple misfires in a multi-cylinder internal combustion engine is so configured that the rough-running values for the individual cylinders are determined. The system then however forms sum terms with these rough-running values and, in turn, forms sums with these sum terms which sums are compared with threshold values. When at least one sum exceeds the corresponding threshold value, then this shows the presence of multiple misfires. As soon as multiple misfires are detected, the rough-running threshold values for allocating misfires to cylinders are reduced. Advantageously, the rough-running values are so modified in advance that their correction terms are influenced as little as possible by misfires. In this way, misfires can also reliably be allocated to individual cylinders when multiple misfires are present.

REFERENCES:
patent: 4044234 (1977-08-01), Frobenius et al.
patent: 4295363 (1981-10-01), Buck et al.
patent: 4337647 (1982-07-01), Radcliffe et al.
patent: 4380800 (1983-04-01), Wilkinson
patent: 5041980 (1991-08-01), Maddock et al.
patent: 5063510 (1991-11-01), Jungens et al.
patent: 5088318 (1992-02-01), Osawa

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