| 摘要 |
PROBLEM TO BE SOLVED: To supply power supply voltage suitable for an assisting electronic controlling device even at the time of lowering of battery voltage. SOLUTION: The electric power steering device is provided with a switch relay 70 switching a power supply path from a battery 60 to the assisting electronic controlling device 31 between a first path which does not go through a boosting circuit 50 and a second path which goes through the boosting circuit 50. When battery voltage is not less than predetermined voltage, the switch relay 70 is turned off to supply power from the first path. When the battery voltage is less than the predetermined voltage, the switch relay is turned off to input the output of the boosting circuit 50 to a regulator 41, thereby enabling assist control even at the time of lowering of the battery voltage. COPYRIGHT: (C)2007,JPO&INPIT |
