Combustion condition detecting system of internal combustion eng

Details Combustion condition detecting system of internal combustion eng Combustion condition detecting system of internal combustion eng

1994-10-19

1997-02-18

Chilcot, Richard

Measuring and testing

Vehicle chassis

Steering

G01M 1500

Patent

active

056043031

ABSTRACT:
A combustion condition detecting system of an internal combustion engine, comprises a first device for detecting the pressure in a cylinder of the engine; a second device for setting an integral range in a crankshaft angle in accordance with a rotation speed of the engine; a third device for integrating the pressure within the integral range thereby to derive an integrated value; a fourth device for judging whether or not an abnormal combustion occurs in the cylinder by comparing the integrated value with a reference value; and a fifth device for issuing an alarm when the fourth device judges occurrence of the abnormal combustion. In accordance with the invention, in a lower engine speed side near the idling speed, the integral range is set to appear after a given crankangle position where the pressure in the cylinder exhibits the maximum.

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