System and method for detecting engine knock in internal combust

Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes

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G01L 2322

Patent

active

050921606

ABSTRACT:
A system and method for detecting occurrence of engine knock in internal combustion engines are disclosed which include: at least one engine knock sensor installed in an appropriate position at each engine cylinder, a band pass filter for passing a particular component of an output signal from an engine knock sensor, a rectifier for rectifying the particular component of the output signal passed through the band pass filter and an integrator for integrating the rectified signal with a variable interval. A device is also provided whereby engine driving conditions are detected, the integration interval being varied according to engine driving conditions so that no overlap of the integration interval of one cylinder with the ignition timing of another occurs. The integrated value derived by the integrator is corrected according to the variable interval, and the occurrence of knock in synchronization with the corrected integrated value is verified.

REFERENCES:
patent: 4478068 (1984-10-01), Bonitz et al.
patent: 4640249 (1987-02-01), Kawamura et al.

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