Electric power steering device

Abstract

Abstract PURPOSE:To control an electric motor for assisting steering force in relation to detected torque with good accuracy by simply setting the output voltage of a torque sensor to a suitable deadzone. CONSTITUTION:The offset voltage of an offset voltage output portion 4 is obtained by dividing the output voltage of a power supply stabilizing portion 2, and the offset voltage is applied to a differential amplifier circuit 11 and a voltage-current conversion circuit 15 in such a manner as to become a designated voltage when a torque sensor TS does not detect torque. The differential amplifier circuit 11 obtain the difference between the respective output voltages of peak detection circuits 8, 13, and the output voltage obtained by adding the offset voltage to the obtained difference voltage is applied to the voltage- current conversion circuit 15. Each output of the voltage-current conversion circuits 14, 15 are input to voltage-current conversion portions 16, 17 through connectors CN1, CN2, and the output is input to a computer 18. The computer incorporates a memory, and the offset voltage is stored in the memory by operating a key switch.

Inventors

• 👤 Makoto Nohara
• 👤 誠 野原

Bibliographic Details