Knocking control system in engine

Details Knocking control system in engine Knocking control system in engine

1983-03-17

1985-06-18

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

73 35, F02P 504

Patent

active

045235660

ABSTRACT:
In a knocking control apparatus for a spark-ignition internal combustion engine, the full-wave rectified output from a vibration sensor is integrated and summed with a constant offset voltage to provide a variable reference signal. The integration time constant is selected to be no more than approximately five times the rise time from inception to maximum value of each knocking occurrence, such that the reference value can remain above the envelope of the background vibrations of the engine, which have a much longer rise time than do the knocking vibrations, without being set too high to detect knocking in a cylinder remote from the location of the vibration sensor. The rectified output of the vibration sensor is directly compared with the reference signal to generate a knocking control pulse each time the alternating sensor output exceeds the reference value.

REFERENCES:
patent: 4279143 (1981-07-01), Guipaud

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