Knock control system for engine

Details Knock control system for engine Knock control system for engine

1990-10-15

1992-04-07

Nelli, Raymond A.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

123435, F02P 514

Patent

active

051017903

ABSTRACT:
A knock control system which detects a knock occurring in an engine, a knock detector for detecting the occurrence of the knock in accordance with a knock sensor signal produced by the sensor, a first adjuster for adjusting knock control factors so as to suppress the knock on the basis of a detected signal from the knock detector, a converter for converting the knock sensor signal so as to make the frequency distribution of the knock sensor signal equal to an exponential distribution, a standard deviation calculator for calculating the standard deviation of the exponential distribution, and a second adjuster for adjusting knock control factors so that this standard deviation reaches a predetermined value, whereby the standard deviation of the frequency distribution of the knock sensor signal can be easily detected, thus making it possible to reduce the load on the electronic control system and prevent the knock detection precision from being reduced by the characteristic change of the knock sensor, engine.

REFERENCES:
patent: 4617895 (1986-10-01), Sakakibara et al.
patent: 4711212 (1987-12-01), Haraguchi
patent: 4711214 (1987-12-01), Sakakibara et al.
patent: 4821194 (1989-04-01), Kawamura
patent: 4884206 (1989-11-01), Mate
patent: 4899710 (1990-02-01), Takahashi
patent: 4964388 (1990-10-01), Lefebvre

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