| Summary: | 碩士 === 國立虎尾科技大學 === 機械與機電工程研究所 === 96 === Nowadays, most of vehicles are equipped with a communication system called Controller Area Network (CAN) to solve the long-bothering network problems, such as disturbing noise interference, bewildering tangle of cables. However, for diagnostics, most of the vehicles manufacturers still follow conventional protocols and standards. In order to implement a vehicle fault diagnostic simulation system with ISO 15765 protocol, the reserach is conducted by following two parts: One is the communication protocol and the other is the physical structure to study.
For the aspect of communication protocol, ISO 15765, ISO 14229-1, ISO 15031-5, and ISO15031-6 are selected to achieve the demands of vehicle fault diagnostic simulation system. The ISO 15765 protocol is mainly followed by the construction of data link layer and network layer, and ISO 15765 associates with ISO 14229-1 and ISO15031-5 and trouble codes in ISO 15031-6 applied to build diagnostic application in the application layer.
In the part of physical structure, the micro controller of Atmel T89C51CC01, the transceiver of Philips PCA 82C251, and other electronic components are used to simulate a car ECU with diagnostic function. Furthermore, a NI-CAN card and an application developed by using software of Visual C++ 6.0 with single-document template are utilized to design a human-computer interface (HCI) for the vehicle diagnostic system. The diagnostic system coupled with the simulated car ECU can perform fault diagnostics, acquisition of engine operating parameter, so as to validate the feasibility of adopting the diagnostic system in connection with a vehicle engine following ISO 15765 communication protocol.
The experiments are performed for acquiring the signals of engine operating parameters using the developed simulation engine system, and the results show that the test result matche the actual measurement results, and, moreover, the received trouble codes correctly match the corresponding demand of the ISO 15031-6 formulation. Therefore, the vehicle fault diagnostic simulation system developed in this thesis can be developed to be a prototype of a practical vehicle diagnostic system with ISO 15765 protocol.
Keywords: Vehicle fault diagnostic system, CAN, Communication protocol
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