| 摘要 |
<p>An engine starting device capable of starting an engine of a vehicle at high reliability by a step-up operation even in time of lowering of a battery output voltage, and suppressing radiation noise and increase in current consumption involved in the step-up operation to a minimum. Through the control of a control circuit (14), a step-up circuit (20) is activated so that a drive voltage does not become lower than a minimum operation voltage of a starter relay (3) in a predetermined period necessary to start the engine in time of the engine start, and the step-up circuit (20) is activated so that the drive voltage does not become lower than a first voltage value higher than a minimum operation voltage of the control circuit (14) and lower than a minimum operation voltage of the starter relay (3) when not in the predetermined period.</p> |
