| 摘要 |
PURPOSE:To obtain the inexpensive control of ignition timing in a simply-constructed circuit by changing the wave-form of an ignition signal almost linearly in a specific lag-side term in the inflection point interval of the repetition period of an ignition signal generated from a magnetogenerator. CONSTITUTION:A captioned device is provided with a comparator 6 to generate a knock-detection pulse on the basis of the comparison between the output signal of an accelerator signal 1 inputted via a frequency filter 2 and others and the output voltage of a noise-level detector 5, and controls a switching circuit 11 concerning an ignition circuit 12 in accordance with the output thereof. In this construction, an ignition signal 20 of a magnetogenerator 9 is given wave-form shaping 13, and outputted to a gate timing controller 4, a gate drive circuit 6, and others. Meanwhile, a level-converter 14 is provided to level-shift the output of an integrator 7 in accordance with the number of revolutions of an engine detected from the ignition signal 20. The above-said wave-form shaping circuit 13 is constructed to chnge the wave-form of an ignition signal almost linearly in a specific lag-side term of the ignition signal 20. |
