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The output of a knock sensor for detecting a knock signal of an engine is applied to a bandpass filter for bandpassing only the knock signal. The output of the bandpass filter is applied to an automatic gain control circuit for variably controlling the gain of the knock signal. The output of the aut

The output of a knock sensor for detecting a knock signal of an engine is applied to a bandpass filter for bandpassing only the knock signal. The output of the bandpass filter is applied to an automatic gain control circuit for variably controlling the gain of the knock signal. The output of the automatic gain control circuit is applied to an averaging circuit via a maximum clamp circuit. A comparator supplies an output to an integration circuit of the next stage when the output of the bandpass filter becomes greater than that of the averaging circuit. An ignition control device for controlling the spark timing of an ignition coil energizes the ignition coil by the output from a pick-up coil and that of the integration circuit and delivers a feedback signal to the integration circuit.

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An engine knock control apparatus comprising: a knock sensor for detecting an engine knock signal; an automatic gain control circuit coupled to receive and amplify a knock detection signal from said knock sensor; an integrating circuit coupled to receive an output signal from said automatic gain con

An engine knock control apparatus comprising: a knock sensor for detecting an engine knock signal; an automatic gain control circuit coupled to receive and amplify a knock detection signal from said knock sensor; an integrating circuit coupled to receive an output signal from said automatic gain control circuit to provide an integrated output signal; means for coupling said integrated output signal to a control input of said automatic gain control circuit to control the amplification of said knock detection signal in accordance with the level of said integrated output signal; and a comparator coupled to receive and compare said integrated output signal and the output signal from said automatic gain control circuit to provide a spark timing control signal to an ignition control device based on said comparison of said integrated output signal and the output signal from said automatic gain control circuit. In an engine control apparatus including a knock sensor for detecting an engine knock signal; a first integrating circuit for integrating the output of said knock sensor; a comparator for producing an output for controlling an ignition control device which controls the spark timing of an ignition coil by means of a signal obtained by the output thereof when the output of said knock sensor becomes greater than the output of said integrating circuit; the improvement including a knock signal clamping circuit which is disposed between the input of said integrator and the output of said knock sensor and clamps the output signal of said sensor in a setting wave height when the wave height of said signal becomes above said setting wave height for preventing abnormal rise of a voltage of said integrating circuit, whereby said comparator compares the output signal from said integrating circuit and that from said sensor. In an engine knock control apparatus including: a knock sensor for detecting an engine knock signal; a first integrating circuit for integrating the output of said knock sensor; comparing means for producing an output for controlling an ignition control device which controls the spark timing of an ignition coil by means of a signal obtained by the output thereof when the output of said knock sensor becomes greater than the output of said integrating circuit; the improvement including a fail-safe device which is disposed between said knock sensor and said ignition control device, and has upper and lower limit setting voltages for detecting normal and abnormal conditions of said knock sensor, said fail-safe device detecting a normal condition when a detecting voltage of said knock sensor is within the range of said setting voltages, detecting an abnormal condition and retarding the angle of the spark timing of said ignition coil to a predetermined value by the output thereof when a detected voltage is out of the range of said setting voltages.