Device for judging knocking strength
First Claim
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1. A device for judging the knocking strength of an internal combustion engine comprising, in combination:
- a resonant type vibration sensor having a resonant frequency which coincides with a knocking frequency range of the engine to be detected, said sensor being connected for detecting vibrations of the engine in its combustion chambers and for delivering an electric output signal corresponding to the vibrations;
means including a rectifier circuit and a smoothing circuit for deriving a rectified envelope wave from said electric output signal;
means for differentiating said envelope wave to form a differentiated output signal having an amplitude representing the steepness of the envelope signal; and
means for judging the knocking level based on the value of the differentiated signal.
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Abstract
A device for judging knocking strength of an engine has a sensor (1) which detects pressure variations in a combustion chamber of the engine. A rectification circuit (3) rectifies the output of the sensor (1), the output of the rectification circuit (3) being smoothed by a smoothing circuit (4) to give the envelope waveform of the output of the sensor (1). The envelope waveform is differentiated by a differentiating circuit (5), the amplitude of the output of the differentiating circuit (5) being used to detect the knocking condition.
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6 Claims
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1. A device for judging the knocking strength of an internal combustion engine comprising, in combination:
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a resonant type vibration sensor having a resonant frequency which coincides with a knocking frequency range of the engine to be detected, said sensor being connected for detecting vibrations of the engine in its combustion chambers and for delivering an electric output signal corresponding to the vibrations; means including a rectifier circuit and a smoothing circuit for deriving a rectified envelope wave from said electric output signal; means for differentiating said envelope wave to form a differentiated output signal having an amplitude representing the steepness of the envelope signal; and means for judging the knocking level based on the value of the differentiated signal. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification