Device and method for determining knocking of internal...

Details Device and method for determining knocking of internal... Device and method for determining knocking of internal...

2007-03-12

2009-12-29

Vo, Hieu T (Department: 3747)

Internal-combustion engines

Spark ignition timing control

Electronic control

C073S035090

Reexamination Certificate

active

07637247

ABSTRACT:
An engine ECU executes a program including a step of, when it has temporarily been determined that knocking had occurred because of the presence of an integrated value greater than a product of the reference magnitude and coefficient Y among the integrated values of vibration in fourth frequency band D that includes first to third frequency bands A to C, calculating knock magnitude N using the integrated values in the synthesized waveform of first to third frequency bands A to C and correlation coefficient K calculated from a vibration waveform of fourth frequency band D. Based on a comparison between knock magnitude N and determination value V(KX), whether or not knocking has occurred is determined. If there is no integrated value greater than a product of the reference magnitude and coefficient Y, it is determined that knocking has not occurred.

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