Research On Magneto-resistance Sensor Utilized In Vehicle Steering System

The steering torque, steering angle and steering direction are the vital parameters for the vehicle especially the vehicles equipped with EPS (Electronic Power Steering). The torque sensor is the key component for the EPS. It is the inevitable trend of integrating the torque, angle and direction in solo-sensor in the development of vehicle technology and the contact torque sensor will be replaced by the non-contact one consequentially. There are other signify factors like cost-lowering and measure-simplifying to accelerate the development of the EPS. Therefore, it is very important to construct and research an appropriate structure for the EPS.The based on MR (Magnetic Resistance) is discussed systemically in this dissertation. The theoretical basis is provided for the designing of the MR sensor in this dissertation too. In this dissertation, first, introduce the magnetic resistance effect and its principle of the semiconductor, and it is the bridge of transferring mechanical parameter to electrical parameter; then the advantages and disadvantages, and the measurement of the torque sensors for the steering system in the market are analyzed; chose the measure for the dissertation; construct the structure of the MR sensor which integrating the measurements of steering torque, steering angle and steering direction and acting all of the load one the torsion bar; the selected torsion bar is analyzed in detail, at last confirm the parameter of it; the conversion from the mechanical value to the electric value is proposed and in the end, and the algorithm is presented according to the actuality of the vehicle steering system and the forecast of the intending steering system.