| 摘要 |
In an electronic ignition, e.g., knocking control apparatus, an acceleration sensor is mechanically coupled to an internal-combustion engine to detect a vibration signal containing not only mechanical vibration information but also knocking information. The vibration signal is first processed in a noise level detector to obtain a reference voltage signal. A rotation-number detector receives a reference revolution signal representative of an engine speed of the internal-combustion engine so as to derive a revolution-speed detecting signal. A gate timing controller receives both the reference revolution signal and the revolution-speed detecting signal to produce a gate control signal. The vibration signal is secondly processed in a comparator based upon the reference voltage signal from the noise level detector so as to obtain an ignition signal. Supply of the vibration signal from the acceleration sensor to the comparator is interrupted by an analog gate based upon the gate control signal so as to suppress the knocking phenomenon.
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