The Embedded Application of Wireless Short-distance Communication Technology in Vehicle Diagnosis Process

The embedded wireless application for vehicle diagnosis is presented. The design uses an ATmega16 microcontroller as a master which controls the wireless RF transceiver module nRF905 to realize the wireless vehicle diagnosis function. The nRF905 module is used for signal transmission between diagnostic-tester and vehicle ECU. Diagnosis application software is also developed on the PC Windows platform. The selected diagnosis functions can send commands to vehicle ECU and receive data from the vehicle ECU through predefined protocols. The realized diagnosis functions in this design includes reading or deleting ECU fault code, coding the ECU, reading dynamic data flow, motivating electrical components diagnosis and uploading or downloading data operations. In addition, the paper also studied the transmission distance and error ratio of the wireless communication module. The corresponding test results are discussed in this paper.