| 摘要 |
PURPOSE:To secure a sufficient starting characteristic with low-unit cost of production in an easy manner, by installing a device which compensates supply voltage for a control voltage generating circuit in time of engine starting. CONSTITUTION:Each of transistors 11-13 to be turned on or off by output ports A-C of a microcomputer 10, a resistors 14-16, an operational amplifier 18 and a regulator circuit 19 are all installed. In order to secure the supply voltage VCC stabilized from battery voltage VB, a Zener diode 20 and a resistor 21 are used. In time of engine starting, even when the voltage VB drops and the microcomputer 10 is reset, a control signal VO, or rather ignition timing, becomes only slightly varied at a point nearby a maximum spark delay angle in consequence. With this constitution, an excellent starting characteristic is offerable. |
