| 摘要 |
PURPOSE:In a device for obtaining after-flow voltage from a three-phase AC generator, to attain accurate temperature control by detecting temperature of a glow plug before start of an engine without using any other temperature detecting means. CONSTITUTION:When temperature of glow plugs 4a-4d decreases to a lower limit, output of a comparator 17 varies from low to high level, and a flip-flop 18 becomes high level at Q. As a result, an AND gate 20a goes high to close a relay 2, and thereby to feed again large current from a battery 1 to the glow plugs 4a-4d. Therefore, temperature of the glow plugs 4a-4d is increased. At this time, output from Q becomes low level to switch off a transistor 11. Thus, the temperature of the glow plugs 4a-4d is detected from both ends potential of a current sensor 3 and both ends potential of a resistance 12, and is controlled in a predetermined range. After start of an engine, output of an engine start sensor 22 becomes high level, and output of an inverter 19 becomes low level to switch off the relay 2 and a transistor 13, while switching on a transistor 21 and closing a relay 10, thus feeding power supply from a neutral point 2 of an alternator 1. |
