Method for Eliminating Influence of Noise in Torque Sensor Voltage Source for Use in Electric Power Steering System

摘要

This invention relates to an electric power steering system of the vehicle. ; This invention is, in the electric power steering system of the vehicle, the steering motor, a motor drive circuit, according to the method of removing the torque sensor power supply noise influence from the torque sensor and the control unit with a micro-motor-driven power steering system, the torque from the torque sensor timing for sampling the amplified voltage to a voltage amplifier amplifies the voltage according as the AD conversion in the AD conversion is required torque sensor power supply noise influence of the electric power steering system, characterized in that the tuning so that they do not match the rising timing of the PWM pulse provides a method to remove. ; According to the present invention, the torque is amplified voltage outputted from the torque sensor and remove the influence of the switching noise of the PWM pulses used to drive the steering motor according as the AD conversion match AD conversion start interrupt timing and the rising timing of the PWM switching pulse in order to prevent and to tune the timing for sampling a torque voltage after AD conversion start interrupt is not consistent with the rising timing of the PWM switching pulses being affected by the switching noise of the PWM pulse The effect is to increase the stability by preventing the steering.