Research Of Brake System Performance Test Technique And Software On-Vehicle

As the parameters to be tested of automobile brake system are more and more complex, the traditional test technique could not meet the current requirements gradually. With the wild application of computer technology developing of top speed in the measuring and controlling field, real-time test system with the characteristics of powerful function, flexible configuration and convenience etc, is a fashion method of automobile field test. The development situation of automobile test technique in home and foreign is introduced at first before analyzing the domestic automobile brake test technique. Then, after studying the concept and characteristics and technical standards of real-time field test system and understanding some limitations existing in the current domestic brake test system and researching the detail of typical data acquisition system, the framework of automobile brake performance test system on-vehicle is proposed and the real application is introduced as a sample from the macroscopic definition of test technique. In the thesis, the hardware design of anti-interference and software algorithm are two key issues about data acquiring and data processing of test system virtual instruments based, from the microcosmic view of test technique for resolving the concreted questions. So, it is one emphasis of this paper. Another emphasis of the paper is of constructing test system software. Two aspects, programming the interface driver and the application software, are the main content. The method of developing the real-time driver under the protection mode of Windows operation is introduced. Then the process from programming a DLL file to using it in another application is detailed written as an example. The real-time display function can be realized under the common software development platform because Windows, the preemptive multitask operation, can provide the multithread for the development of user application interface completely. At the same time, the current database technology is used for manage the more and more complicated acquired data.Finally, two researched and developed projects are introduced completely. The dedicated portable integrated test system of automobile braking has been designed as the typical application of field test instrument in automobile test field. The complete solution including the key point of hardware, software, interface has been researchedand applied, and the accurate data acquired in the end. A real-time piezoelectricity biochip test system is representative. The framework of this system has been constructed and the part software technique from the previous application has been reused as the main development work. In the development of both projects, the test method and the hardware and software technology aforementioned in the paper about data acquiring and processing have been applied.