Combustion state-detecting system for internal combustion engine

Details Combustion state-detecting system for internal combustion engine Combustion state-detecting system for internal combustion engine

1997-02-14

1998-05-05

Dombroske, George M.

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

057476810

ABSTRACT:
A combustion state-detecting system for internal combustion engines has a crank angle sensor which generates a crank angle signal with a predetermined period shorter than the firing period of the engine whenever the crankshaft rotates through a predetermined angle. A value of the rotational speed of the engine is detected whenever the crank angle signal is generated. An average value of the detected engine rotational speed is calculated over every period of one rotation of the crankshaft. A difference amount between a newest value of the average value of the detected engine rotational speed and a value of the average value calculated a predetermined number of firing periods earlier is calculated. The combustion state of the engine is detected based on the difference amount.

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