| 摘要 |
<p>PROBLEM TO BE SOLVED: To attain simplification, size reduction and cost reduction of the device constitution of a motor-driven power steering device provided with a plurality of power sources for torque sensor 7. SOLUTION: A power source 53a (9 V power source) is made by the output of a power source circuit 52 connected to a battery 13 and a power source 53b (3 V power source) is made by the 9 V power source, and the powers are supplied to the torque sensor 7. The output voltage of the power source 53a is divided with a resistor R1, a diode D1 and a resistor R3 and the output voltage of the power source 53b is divided with a resistor R2, a diode D2 and the resistor R3 and the electric potential at a common connection point P is lead out to a power source abnormality judgment part in a microcomputer 54 through the integration circuit of a resistor R4 and a capacitor C. Only a single A/D converter is needed to be prepared for the two power sources in the microcomputer 54 side.</p> |
