| 摘要 |
PURPOSE:To enable to control the ignition timing in the optimum condition at all times by a method wherein the ignition timing is controlled by a number of revolution and a suction pressure when the knocking is not being generated while it is controlled by the suction pressure upon the knocking is being generated but not by the same which is lowered when the knocking is being generated, in the internal-combustion engine in which a supercharging pressure is lowered upon knocking. CONSTITUTION:In case a decision circuit 21 decides that the knocking is not being generated by the signal of a knocking sensor 1, the signals of a revolving number sensor 2 and a suction pressure sensor 3 are inputted into an ignition timing operating circuit 25. On the other hand, when the decision circuit 21 outputs a knocking signal A into a supercharging pressure control unit 22 and a breaking circuit 23, the supercharging pressure is reduced under a constant opening degree signal of a throttle sensor 15 and the output of the sensor 3 is also cut off simultaneously. Accordingly, the revolving number signal and the suction pressure signal before the cut-off which is being held in a memory circuit 24 are inputted into an operating circuit 25. According to this input, the ignition timing is brought to the side of delayed angle than the limit of knocking. In case there is a change in the opening degree signal of the sensor 15, the breaking circuit 23 is stopped regardless of the existence or non-existence of the signal A and the operation is effected by a new suction pressure. |
