The Reseach Of Vehicle ECU Data Exchange Module Based On Wireless Network

Engine electronic control system after 10 years of development has become increasingly perfect. In order to adapt to the fierce market competition, no matter from the design of hardware circuit to software control strategy development. Major automotive multinational companies have developed new products constantly. Low efficiency of diagnosis and maintenance, inconvenient instruments of vehicle maintenance and repair couldn’t meet more quickly and security of user service requirementsfor automotive after-sales service manufacturer and user. In this thesis, based on the wireless communication control technology and the on-board network technology, we applied the ever-changing intelligent terminal to optimize automotive service quality. We further studied the vehicle ECU wireless interactive module,including the blue tooth transmission technology, calibration technology and diagnosis technology in this paper. Through the optimization and integration of these technologies, we established the optimal overall design. And, we have fully mastered the wireless transport protocol content, established the optimal transport protocol to meet the design requirements. Based on the required functionality in design scheme, we carried out in accordance with the module function and designed the corresponding circuit. In the aspect of software design, in order to finally satisfy design requirement, we implemented the microcontroller XC2238 N resource allocation by graphical configuration software DAVE and Programmed in C code with compile software TASKING, and master many vehicle protocol, such as the ISO15031, J1939 and CCP protocol. In addition, we must learn development test content of the engine electronic control system and mutual relationship between control parameters, and analyze the requirements of the calibration system to determine MAP calibration parameters, variables, and constants of the engine electronic control system.In order to verify the performance of product design, we conducted application testing in the Foton car with the wireless interaction module that we developed and mobile terminal software that our team designed. Furthermore, we conducted CANoe, CANape tools simulation test to verify the functionality of the software and data integrity and test the stability of the hardware circuit in EMC test. It turned out that vehicle ECU data interface module that we developed based on wireless network has certain usability and market prospect of this module is very considerable. But, the comprehensiveness and compatibility of product features is insufficient, it remains to be further in-depth study.