| 摘要 |
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.
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