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An ignition timing control device for an internal combustion engine including a knocking sensor for detecting knocking of the engine, a reference voltage generator for generating a reference voltage dependent on the level of an output signal from the knocking sensor, a comparator for comparing the o

An ignition timing control device for an internal combustion engine including a knocking sensor for detecting knocking of the engine, a reference voltage generator for generating a reference voltage dependent on the level of an output signal from the knocking sensor, a comparator for comparing the output signal from the knocking sensor with the reference voltage and for generating a train of pulses dependent on an amplitude of knocking as produced, an integrator for integrating an output signal from the comparator in an analog or digital manner, ignition timing controller means responsive to the level of the output voltage from said integrator for controlling the ignition timing of the internal combustion engine, and control means triggerable by the output of said comparator for increasing a variation speed in the output signal level of said integrator during no knocking as time elapses, whereby a speed at which ignition timing of the internal combustion engine is advanced, is increased as time elapses.

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An ignition timing control device for an internal combustion engine, comprising: (a) a knocking sensor for detecting knocking of the engine; (b) a reference voltage generator for generating a reference voltage dependent on the level of an output signal from said knocking sensor; (c) a comparator for

An ignition timing control device for an internal combustion engine, comprising: (a) a knocking sensor for detecting knocking of the engine; (b) a reference voltage generator for generating a reference voltage dependent on the level of an output signal from said knocking sensor; (c) a comparator for comparing said output signal from said knocking sensor with said reference voltage to generate a train of pulses in a number dependent on an amplitude of knocking; (d) an integrator for integrating an output signal from said comparator; (e) ignition timing controller means responsive to the level of the output voltage from said integrator for controlling the ignition timing of the internal combustion engine, said ignition timing controller means retarding said ignition timing at a fixed rate when knocking is detected, and advancing said ignition timing at a speed that is variable with an elapsed time during which no knocking is detected; and (f) control means triggerable by the output of said comparator for increasing a variation speed in the output signal level of said integrator during no knocking as time elapses, whereby said speed at which ignition timing of the internal combustion engine is advanced, is increased as time elapses.