Combustion monitoring apparatus for internal combustion engine

Details Combustion monitoring apparatus for internal combustion engine Combustion monitoring apparatus for internal combustion engine

1997-01-30

1999-07-20

Dombroske, George

Measuring and testing

Vehicle chassis

Steering

324399, 324402, 73 3508, G01M 1500

Patent

active

059258195

ABSTRACT:
A combustion monitoring apparatus for an internal combustion engine is provided which is designed to distinguish abnormal combustion conditions from a normal combustion conditions using a combustion ion current included in a current flowing through plug electrodes of a spark plug, resulting from motion of ions between the plug electrodes which are produced by combustion. For example, if a maximum value of the combustion ion current during one combustion cycle is smaller than a given value, it is determined that a misfire has occurred. If an attenuation time from generation of the current flowing through the plug electrodes until a variation in the current is decreased to a given value is shorter than a given time period, it is determined that a flame has been blown out before combustion is completed.

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