Device for determining engine knocking intensity from detected v

Details Device for determining engine knocking intensity from detected v Device for determining engine knocking intensity from detected v

1991-12-18

1994-05-17

Chapman, John E.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

73116, G01L 2322

Patent

active

053117654

ABSTRACT:
This invention relates to an engine knocking detector for determining knocking intensity from the oscillation waveform of the cylinder internal pressure. The total amount of heat generated in the combustion chamber during one revolution of the crankshaft is computed from the pressure waveform from which high frequency components have been eliminated, and from the running state of the engine. Also, the knocking start point during one revolution of the crankshaft is determined by comparing high frequency components extracted from the waveform and a predetermined reference value, and the amount of heat due to knocking is computed. A knocking intensity is then determined by comparing these two amounts of heat. By detecting knocking based on this comparison of amounts of heat generated in the combustion chamber, the knocking can be detected with high precision by means of a common logic irrespective of engine differences, installation positions of cylinder internal pressure sensors and individual sensor differences.

REFERENCES:
patent: 4821194 (1989-04-01), Kawamura
Yoshihisa Kawamura et al., "Recent Technologies in Knocking-Detection and It's Quantitative Processing in Spark Ignition Engine" Journal of the Society of Automotive Engineers of Japan, vol. 40, No. 11, 1986, pp. 1409-1417.

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