Engine knock control with detector and filter

Details Engine knock control with detector and filter Engine knock control with detector and filter

F - Mech Eng,Light,Heat,Weapons

02

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317/5.35

F02P 3/08 (2006.01) F02P 5/152 (2006.01) F02P 9/00 (2006.01)

Patent

CA 1154819

D-3, 467 C-3228 ENGINE KNOCK CONTROL WITH DETECTOR AND FILTER Abstract of the Disclosure A spark ignited internal combustion engine includes apparatus effective to generate a signal from knock-induced and other ringing vibration bursts with amplification over a wide passband around the characteristic knock frequency. The signal is demodu- lated to obtain the envelope pulses of the knock and other vibration bursts and filtered in a multipole, low pass filter having a half power frequency from 100 - 200 Hertz. The output of this filter, in which other pulses are significantly attenuated with respect to knock pulses, is further processed to obtain a knock control signal which controls spark retard apparatus to limit knock intensity.

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