The Study And Design Of Body Control Module For Battery Eletric Vehicle

With the improvement of battery electric vehicle electrical degree,electronic devices in vehicle body have been used more and more.This can lead to wire harness become more arduous and the communication failure between each equipment also will be increased.So it is an inevitable trend that the body controller is cleanly isolated from vehicle controller,in other words,the electronic components in battery electric vehicle body are controlled by BCM.What is more,battery electric vehicle is wildly used in rental market.In order to satisfy higher safety,comfort and convenience demand of users for battery electric vehicle,the study of identification,electronic components in vehicle body are remotely monitored and battery failures are early warned has important significance for security and rental of battery electric vehicle.Chongqing University of Posts and Telecommunications and an enterprise are already working in cooperation on a project to study BCM in battery electric vehicle.Some technologies are studied and designed in the dissertation,including electronic components in vehicle body are controlled and remotely monitored,identification,and battery failures are early warned.The main work finished in this thesis is as following:1.RFID technology,CAN bus technology and GPRS technology are researched and analyzed firstly.Then the instructions of serial communication between RFID and BCM and CAN message format are defined,and the CAN message includes battery failure information,state information of electronic components in vehicle body and the remote control-instruction.Beyond that,the remote supervisor data transmission flow of electronic components in vehicle body is proposed.2.The overall design scheme of BCM in battery electric vehicle is presented firstly.Secondly,the hardware circuit is designed,including the minimum system circuit,the input interface circuit and the output drive circuit.Thirdly,the data format in communication between BCM and RFID module is investigated.Then,the message body format of uplink data and downlink data is defined,and the uplink data is the state information of electronic components in vehicle body and the downlink data is the control commands sent by server-side.Finally,communication protocol through CAN bus between BCM and BMS is defined.3.Software of the application layer and the communication layer for BCM are designed.The application layer includes lamp module,window module,wiper module and lock module.And the communication layer includes identification,data is sent through CAN bus and battery failures are early warned.4.A test platform of BCM in battery electric vehicle is built to achieve different functions test.And these functions include body control logic,identification,the transport protocol of the remote supervisor data for electronic components in vehicle body and battery failures are early warned.Then windows,turn signals and the driving performance are tested and analyzed,and the test results show that BCM in battery electric vehicle meet the design requirements.