Hangzhou zhengqiang electrical Ltd. Co. will produce the ECU,by which is studied by themself.

ECU is electric control unit in EPS. The electric power steering (EPS) has a feature that a flexibility of the layout is high, and an energy consumption is small, in comparison with a hydraulic power steering apparatus. Accordingly, in recent years, the introduction of the EPS has been considered for many kinds of vehicles ranging from compact vehicles to large-sized vehicles.

In the vehicle steering apparatus, one of the most important issues for achieving excellent steering feel is to suppress vibration transmitted through a steering wheel and noise generated by the vibration. In particular, in the EPS that includes a motor as a driving source, torque ripples of an order component (X-th order component) proportional to an integral multiple of a motor rotational angle (mechanical angle) are generated due to electrical and mechanical factors. The torque ripples of such an order component resonate with the mechanical structure of the EPS and the vehicle, so that the vibration and noise generated by the torque ripples of the order component are further increased.