| 摘要 |
PURPOSE:To detect an angle at a low cost and exactly by one sensor by constituting so that one or more teeth of a rotor and a rotary disk for constituting a rotational angle sensor are made to lack, or the angle of the teeth does not become an equal interval, and detecting it by an electromagnetic pickup, a photocoupler, etc. CONSTITUTION:A rotational angle sensor is constituted of a rotor 10a and a pickup coil 10b. A rotational angle signal obtained by shaping a signal detected by the pickup coil of the rotational angle sensor 10, and a digital value converted by inputting a suction pressure detected by a suction pressure sensor 11 to an A/D converter 22 are inputted to a microcomputer 25. The microcomputer 25 discriminates a cylinder by the inputted rotational angle signal and calculates a revolving speed. Subsequently, basing on a map containing the revolving speed and the suction pressure value as parameters, an optimum ignition time of every cylinder and the electric conduction time are calculated. Next, an electric conduction igniting signal is outputted to igniters 23, 24 from the output port. |
