| With modern electronic technology and computer technology continues to evolve and progress, in order to improve vehicle performance, streamline operations, reduce energy consumption, improve comfort, more and more electronic control devices are used in all aspects of car. One of them is AMT.AMT, is short for Automated Mechanical Transmission, that is electronically controlled automatic mechanical transmission, In the same structure of mechanical transmission and clutch, remove the manual shift part of the electronic control mechanism, according to the intention of the driver and vehicle running conditions, the light shift, clutch control, adjust the engine throttle other law, the appropriate agencies to achieve control of the vehicle's engine, clutch and transmission integration, automation control, so that the efficiency with three to play the best and optimum performance. It can transform the traditional mechanical transmission, low cost, so it's easy to promote, by manufacturers and users to accept. AMT has a fuel consumption of vehicles using low, high reliability, operational efficiency, safety and comfort, etc.Automatic transmission is a very important vehicle equipment, its performance will directly affect vehicle handling, comfort and economy, and the complex working environment, put into use before it is necessary to carry out all aspects of testing, ensure its quality and performance can reach the actual requirements. The core of automatic transmission is TCU, therefore, research and development of a set of AMT's control unit can carry out all aspects of TCU's testing and certification system of testing is necessary.Based on the actual needs, design a set of computers, sensors and virtual instrument technology and system integration testing and certification. At first I analysis of the test system in the structure, function and structural and other needs, then design the hardware circuitry to meet the needs of the module, after commissioning the preparation of the corresponding lower computer program, and then use VC + +6.0 to develop PC monitoring and control interface software, and finally on-line testing.Testing and certification system includes the main section, load, power supply and PC, STM32F105 is used as the master chip. It can output 9 analog signals, 12 switch signals, and 2 Hall signals, provide 3 electrical simulation load and 4 relay load, detect the power supply capacity of TCU, test CAN bus communication. There are two modes of test system: One is the testing process in accordance with pre-configured to automatically test, the testing process, data, and the results sent to the host computer via CAN bus, processing, storing, generating reports; The other is the PC control mode, by using PC control software which is developed by VC + +6.0, it can control test content and test standards, according to the user's intent. Test equipment, TCU and the host machine can communicate via the CAN bus. In both modes, the test content and results in the test system to light in the form of the front panel display. Test system can be individually tested, and also supports up to 5 test unit combined with the test.Now, this test system has been applied to the actual TCU testing work, provides a powerful tool for the testing work of automatic transmission, does improve the research environment and development capabilities, improved automatic transmission development efficiency, so that research and development work in this article have practical significance. |
