| 摘要 |
PURPOSE:To improve the output in an actually-used revolution range and improve acceleration performance by reducing the delay-angale control amount in ignition timing, in a partial-load range where supercharge pressure does not reach a limit value. CONSTITUTION:A revolution detector 23 detects the number N of engine revolution on the basis of the output of a gate timing controller 4 and drives a transistor 22. When said transistor 22 is in OFF state, the whole output of an analogue gate 3 is input into a noise-level detector 5 through a resistor 22. When the transistor 22 is in ON state, the electrode of the resistor 21 secures the earth potential and the output of the analogue gate 3 is divided by resistors 20 and 21 and input into the noise-level detector 5. Therefore, the number of knock signals which is detected with the number N of revolution or less, namely the output of a comparator 6 reduces, and the output of an integrator 7 reduces. Therefore, the amount of phase shift of a phase shifter 8 reduces, and the amount of delay of the ignition timing is reduced, and the ignition timing is set toward advance side and the engine output is improved. |
