Undesirable combustion characteristic detection apparatus

Details Undesirable combustion characteristic detection apparatus Undesirable combustion characteristic detection apparatus

1980-05-21

1982-05-18

Gill, James J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

G01L 2322

Patent

active

043298710

ABSTRACT:
An apparatus for detecting undesirable combustion characteristics in spark-ignited internal combustion engines. A sensor and a band-pass filter tuned to the frequency of the knock vibration are provided with an output of the band-pass filter being compared with a reference value. The result of the comparison is correlated with undesirable combustion characteristics to be recognized. A rectifier is provided for solid-borne sound signals received by the sensor with the signals passing through the band-pass filter. The signal is rectified in the rectifier to a knock signal and a series circuit made up of a band-stop filter tuned to the frequency of the knock vibration, an rms rectifier, and an amplifier is provided by means of which the sound signal received by the sensor is converted into a reference signal. A comparator is provided when the reference signal and the knock signal are compared with each other and an output signal appears if the knock signal exceeds the reference signal.

REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 4236491 (1980-12-01), Hattori et al.

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