| 摘要 |
PURPOSE:To improve the operational efficiency of an engine, by selecting a knock signal in a specified frequency from the output of an acceleration sensor, while delaying the ignition timing according to the level and controlling the knocking of the engine by making a phase angle for the ignition timing larger in time of acceleration. CONSTITUTION:An output signal from an acceleration sensor 1 passes through a frequency filter 2 whereby a mechanical noise component is controlled, closing an analogue gate 3, and an ignition noise is thus intercepted. Next, the output signal of the analogue gate 3 and the output of a noise level detector 5 both are compared by a comparator 6, generating a pulse commensurate to a knock signal and also generating integrated voltage by the way of integrating this pulse with an integrator 7, and then the output signal of a waveform shaping circuit 10 is phase-shifted to the lag side by a phase shifter 8 in a timed manner. Therefore, the output phase is more behind than the phase of a reference ignition signal of the circuit 10, delaying the ignition timing of an ignition coil 12 by driving and controlling a switching circuit 11, so that knocking is well controlled. |
