Research On Vehicle Position Detection And Power Supply Rail Switching Technology Applied To Segmented Rail

The dynamic wireless power transfer technology based on segmented rails is an emerging technology that has developed in recent years,but it has gradually become a research hotspot of domestic and foreign research teams.The segmented power supply rail is developed from the traditional bipolar pad.Compared with the traditional array power supply pad and rectangular-long-type power supply coil,it has obvious advantages,but the segmented rail technology still has many technical problems which need to be solved by researchers.The research of position detection and switching technology will affect the reliability of dynamic wireless power transfer system based on segmented rails.The purpose of this paper is to study and design a set of rail switching system and position detection system.Through the accurate detection of vehicle position by the position detection system,the rail switching system is controlled to realize the corresponding rail switching,which makes the dynamic wireless power transfer system based on the segmented rail run efficiently and safely.Firstly,the scheme research and device selection are carried out.The advantages and disadvantages of the traditional rail switching schemes are analyzed,and a multi-source hybrid alternating power supply scheme is adopted on the basis of various schemes.This scheme can realize the rail switching function,and reduce the received power fluctuation caused by the rail switching process.On the basis of this scheme,IGBT is selected as the switching device for rail switching.The traditional location detection scheme is discussed,and a hybrid detection scheme based on 2.4 Ghz RF signal received signal strength indication(RSSI)and Kalman filter algorithm is proposed,and CC2500 is selected as the core chip of RF module.The two systems are combined with the main controller to complete the overall system design.Secondly,the design of the rail switching system is completed.On the basis of completing the selection of IGBT and IGBT driver board according to the actual needs of the subject,the hardware and software design of the core control board inside the switch box is completed.Through the reasonable distribution of the internal space of the switch box,the electromagnetic compatibility of the entire rail switching system is improved to ensure that the rail switching system can reliably complete the rail switching work under the normal working condition of the dynamic wireless power transfer system.Thirdly,the design of position detection system is completed.The software and hardware design of the vehicle-mounted RF transmitting board and the ground RF receiving board in the position detection system are completed respectively.The ground radio frequency receiving board is designed to carry two radio frequency modules to improve the accuracy of position detection,and the two RF modules are also used to realize the power-on self-test function of the ground RF receiving board.According to the requirements of the dynamic wireless power transfer system for the temperature detection of the ground transmitting coil and the resonance capacitor,a temperature measurement module based on PT100 is added to the ground RF receiving board.The wireless signal attenuation model and standard Kalman filter are studied,which lays a theoretical foundation for the accurate measurement of vehicle position.Finally,the Maxwell is used to complete the simulation study of the magnetic coupler of the dynamic wireless power transfer system,and the optimal position of the rail switching is obtained through the simulation.The reliability of the rail switching system is verified by experiments,and the joint adjustment with the main controller is realized.In the case of the rail working,the temperature module of the ground RF receiving board is tested,which basically meets the temperature monitoring requirements of the dynamic wireless power transfer system.The calibration of the wireless signal attenuation model is completed,and the initial distance measurement is completed when the vehicle-mounted RF transmitter board moves at an approximately uniform speed of 2.5m/s.Finally,the distance measurement data is imported into the simulation calculation software for data processing and Kalman filtering processing,simulating the data processing of the main controller,after 16 iterations,the distance measurement accuracy is improved to within 0.5 m,which can effectively meet the detection accuracy requirements of the position detection system.