| 摘要 |
PURPOSE: To miniaturize a motor and to make wiring fine in use and to prevent easily receiving of an influence by fluctuation of voltage, by providing on the halfway of a current supply passage to the motor a booster circuit of boosting battery voltage from an on-vehicle battery applied to the motor. CONSTITUTION: A booster circuit is provided on the halfway of a current supply passage to a motor from an on-vehicle battery. When boosted voltage Vout is smaller than a preset value VST (S101) with battery voltage Vin smaller than a prescribed value V1 (S104), a warning lamp is flashed (S106), and when a condition of the battery voltage Vin smaller than V1 is continued for a Δt time or more (S107), the boosted voltage Vout is lowered down (S110). In the case of not continuing for the Δt time or more, the battery voltage Vin is checked (S108), and when it is larger than V2 of value lower than V1, a battery system is decided abnormal, to lower down the boosted voltage Vout (S109). When the battery voltage Vin is smaller than V2 (S108), the battery system is decided abnormal, to lower down the boosted voltage Vout (S110). |
