| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an electric power steering device capable of continuing assist control without the steering becoming unstable even when an abnormality occurs in a booster circuit. <P>SOLUTION: When the booster circuit 25 is determined to be abnormal (NO at S101), an output voltage Vout at a connecting point c is determined to be a second voltage threshold value V<SB>2</SB>or lower (NO at S103), and a vehicle speed V of the vehicle is higher than a predetermined speed threshold value V<SB>0</SB>(20 km/h) or higher (YES at S105), a power supply voltage output circuit 30 adjusts the voltage duty ratio to gradually increase a power supply voltage Vin of a direct current power supply 20 from 0 V to 12 V and outputs it to an inverter 12. When the vehicle speed V of the vehicle is the predetermined threshold value V<SB>0</SB>or less (NO at S105), the power supply voltage output circuit 30 immediately outputs the power supply voltage Vin from the direct current power supply 20 to the inverter 20. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
