G - Physics – 01 – L
Patent
G - Physics
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L
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G01L 23/22 (2006.01) F02P 5/152 (2006.01) G01H 1/00 (2006.01) G01N 29/12 (2006.01) G01N 33/28 (2006.01)
Patent
CA 1067716
ENGINE KNOCK SIGNAL GENERATING APPARATUS WITH NOISE CHANNEL INHIBITING FEEDBACK Abstract of the Disclosure A vibration sensor mounted on an internal combustion engine characterized by knock-induced vibrations at a charac- teristic frequency and by other vibrations is tuned to resonate at substantially the characteristic frequency. A bandpass filter tuned to the characteristic frequency is connected to the vibration sensor output; and the output of the filter is pro- vided to one input of a comparator and to average detector circuitry for generating a unidirectional noise reference signal representing noise at the characteristic frequency, which signal is provided to the other input of the comparator. The knock signal, obtained from the output of the comparator and compris- inq pulses corresponding to knock-induced peaks of amplitude greater than the unidirectional noise reference signal, is fed back through a low-pass filter to the average detector circuitry in sense to oppose increases in the unidirectional noise refer- ence signal during said knock-induced peaks. The connection of the average detector circuitry to the output of the bandpass filter provides adaptability for mistuned sensors; and the nega- tive feedback to the average detector circuitry reduces the distorting effect, amplified by the bandpass filter, of said knock-induced peaks on the unidirectional noise reference signal, which might otherwise distort the output knock signal.
306178
Hamren Glen C.
West Gene A.
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