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Power steering system

Automotive vehicles generally have power steering systems that reduce the input force required to turn or steer a vehicle. The electric power steering system has a steering mechanism which is connected with a steering wheel via a steering shaft. The steering mechanism is provided with a torque sensor for detecting a steering torque applied to the steering wheel and a motor for assisting operations of the steering mechanism. The torque sensor converts a torsional torque of a steering shaft, which is generated by steering of a steering wheel connected to the steering shaft, to an analog signal (voltage) and outputs it to an electronic control unit (ECU). In the ECU, an analogue to digital (AD) converter circuit converts the analogue signal to a corresponding digital value. As the motor is driven in accordance with the steering torque detected by the torque sensor, a steering force which a driver needs to apply to the steering wheel is reduced. Electric power steering systems are generally adapted to control the output rotation of an electric motor according to a steering torque applied to a steering member such as a steering wheel when the steering member is rotated for operation.

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