Automotive Engine Control System Detection

Following the development of the computer science and automotive industry, the technology of automobile detecting system is developing too. This dissertation aims at automobile engine this special object, designs and exploits the signal conditioning and data acquisition hardware. Based on this reliable hardware, exploits the software which applies to the computer. This system implements a relative blocking with low-cost. There are three blocks in this system: analog block,digital block and computer terminal block. The dissertation starts at the requirement of the whole system, introduced from above to below: the structure of the whole system and main functions; the function and the interface of each block. On analog block, it is very important to consider the anti-interference design to minish noise. The optimal circuit design is from a lot of experiments, so it can insure the linearity about the analog signal acquisition, buildup the anti-interference ability and enhance the detecting system reliability. The design of digital block starts with a lot of key index, in order to design a compact digital circuit. To customize a communication protocol, the communication flow analysis is needed, so the computer and the digital circuit can communicate all the time without disturbing the program running each other. On this part the Keil C programming language is used. Computer terminal block adopted the virtual instrument technology, used graphics mode programming language —LabVIEW, exploited an application on computer .This application have real-time data acquisition,signal analysis and disposal functions, can output as oscillograph mode. At last , the dissertation gave a result of this detecting system, analyzed the merits and demerits of the system and advised mend methods. The system has low-cost,high efficiency and reliable performance characters, and can be uses conveniently with friendly interface. A lot of experiments proved that this automobile engine detecting system has definite applied worthiness.