Research On EPS Torque Angle Sensor Integration

The steering wheel torque sensor and angle sensor both are important parts of automotive electric power steering system, the quality of its output signal directly effect the performance of the electric power steering system. In order to meet the measurement requirements of steering wheel torque and rotation angle of electric power steering system. In this paper, a kind of non-contact intelligent sensor for simultaneous output torque and angle signal is studied.Firstly, the existing torque sensor and angle sensor are analyzed in this paper. and The torque and angle sensor which can simultaneously provide the composite signal are discussed Then it introduces the basic theory of Hall effect, and summarizes the methods of measuring torque. According to Automotive Hall steering characteristics and performance of the chip, proposed a new method of measurement to realize the corner, the torque measured simultaneously.Secondly, through the gear derivation analysis to determine the basic parameters required gear, and the sensor assembly of each transmission gear carried on the detailed design.Thirdly, The design of the circuit of the sensor is carried out, This article will be divided into single-chip sensor measuring circuit management module, a torque sensor chip modules, angle sensor circuit chip module, and separately for each of the measuring circuit selection and design.Finally, the static calibration of the output of the sensor is carried out. The calibration results were processed for analysis, the relevant specifications of the sensor. The test results show that the non contact torque angle sensor in this paper can meet the requirements of the torque and angle measurement of the electric power steering system.