Control device for an internal combustion engine
First Claim
1. A control device for an internal combustion engine comprising:
- detecting means for detecting a signal corresponding to a particular frequency component caused by the knocking from pressure changes produced in the combustion chamber or vibrations caused by the pressure changes;
signal treating means for rectifying the detected signal from said detecting means;
smoothing means for smoothing the rectified signal from said signal treating means to obtain a first reference signal;
a first comparing means for comparing said first reference signal and said rectified signal;
integrating means for integrating the output signal of said comparing means;
a function generator for generating a second reference signal in response to said first reference signal;
a second comparing means for comparing the integrated signal from said integrating means and said second reference signal;
operating and controlling means for feedback-controlling at least one of an ignition timing, an exhaust gas recirculation flow rate, a fuel injection amount and a fuel injection timing in response to the output signal from said second comparing means.
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Abstract
A control device for an internal combustion engine is disclosed in which an ignition timing, etc. is feedback-controlled according to the detected knocking state. An output signal of a knocking sensor is half-wave rectified by a signal treating section and smoothed by a smoothing section to obtain a first reference signal. The rectified signal and the smoothed signal thereof are then compared by a first comparator section and the difference signal thus obtained is integrated by an integrator section to obtain a signal substantially depending on the strength of the knocking. The first reference signal is also applied to a function generator which generates a second reference signal as a function of the first reference signal and also corresponds to the components caused by the factors other than the knocking. Finally the integrated signal and the second reference signal are compared by a second comparator section to produce a correct knocking detection signal.
22 Citations
7 Claims
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1. A control device for an internal combustion engine comprising:
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detecting means for detecting a signal corresponding to a particular frequency component caused by the knocking from pressure changes produced in the combustion chamber or vibrations caused by the pressure changes; signal treating means for rectifying the detected signal from said detecting means; smoothing means for smoothing the rectified signal from said signal treating means to obtain a first reference signal; a first comparing means for comparing said first reference signal and said rectified signal; integrating means for integrating the output signal of said comparing means; a function generator for generating a second reference signal in response to said first reference signal; a second comparing means for comparing the integrated signal from said integrating means and said second reference signal; operating and controlling means for feedback-controlling at least one of an ignition timing, an exhaust gas recirculation flow rate, a fuel injection amount and a fuel injection timing in response to the output signal from said second comparing means. - View Dependent Claims (3, 4, 5, 6, 7)
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2. A control device for an internal combustion engine comprising:
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detecting means for detecting a signal corresponding to a particular frequency component caused by the knocking from pressure changes produced in the combustion chamber or vibrations caused by the pressure changes; signal treating means for rectifying the detected signal from said detecting means; smoothing means for smoothing the rectified signal from said signal treating means to produce a first reference signal; a first comparing means for comparing said first reference signal and said rectified signal; integrating means for integrating the output signal from said comparing means; speed detecting means for generating a speed representing signal depending on the rotation speed of the engine; a function generator for generating a second reference signal in response to said speed representing signal; a second comparing means for comparing the integrated signal from said integrating means and said second reference signal; operating and controlling means for feedback-controlling at least one of an ignition timing, an exhaust gas recirculation flow rate, a final injection amount and a fuel injection timing in response to the output signal from said second comparing means.
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Specification