Knock detection circuit with gated automatic gain control

Details Knock detection circuit with gated automatic gain control Knock detection circuit with gated automatic gain control

1987-06-09

1988-08-09

Myracle, Jerry W.

Measuring and testing

Engine detonation

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

G01L 2322

Patent

active

047619929

ABSTRACT:
A knock detection circuit includes an audio transducer (2) converting audio signals indicative of engine combustion into output signal voltage including a portion representing background noise and a portion representing detonation. An active variable resistor is provided by a transistor (14) having a gain which adjusts the amplitude of the transducer output voltage. A sampling and controlling circuit (30, 22, 28) samples the portion of the transducer output voltage representing background noise and outputs a variable bias determined by sensed background noise, which bias controls the gain of the transistor to adjust transducer output voltage inversely with sensed background noise. A detonation threshold detector (58) responds to a predetermined increase in the amplitude of the portion of the transducer output voltage representing detonation above the amplitude of the portion of transducer output voltage representing background noise, and outputs a knock-detected signal. Gated automatic gain control self-adapts and compensates for differing transducer sensitivities providing differing sensed background noise.

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