The Study And Application Of The Detection Technique Of The Vehicle Braking Performance Based On Dynamic Sensing Technology

With the swift and violent development of the automobile industry and communication of our country, the technical feature and quality of the vehicle are higher and higher, the use of the instrument for vehicle braking performance test is popularized, and the demand of the detecting instrument is larger and larger. But up till now, the instrument for vehicle braking performance test used and applied on the market can not meet the higher and higher demand of the vehicle detecting in many aspects such as avoided installing, fast measuring, storing amount of data, volume, power consumption and the convenient using etc. So, develop a kind of high-performance instrument for vehicle braking performance test with the characteristics of avoided installation and fast measuring as soon as possible, easy to handheld operation, large storing amount of data, easy to carry on data management, has important realistic meaning and using value.With the analysis and study of the problem and deficiency of the instrument for vehicle braking performance test at present, the scheme of adopting multidimensional acceleration transducer was put forward, the signal of dynamic vehicle-braking process were sampled and dealt with utilizing multidimensional acceleration transducer. The acceleration of the axial, horizontal and vertical direction of the vehicle were detected respectively in the course of the vehicle braking, and then every parameter was calculated out according to the corresponding algorithm.This text has studied the test algorithm of the brake distance and the initial velocity suitable for realizing in MCU. On the basis of carrying on abundant test algorithm proving, comparing and experiment, the mode of the host and slave computer was adopted, among which the host computer adopted the portable computer, and the software of PC realized to manage the measured data, form the test report and draw the test curve etc. The slave computer adopted MCU, with LCD(Liquid Crystal Display) and corresponding operation button, which made it not only have the independent test function and can be used alone, and also carry on data transmission between the PC and MCU by the communication way. The design made the testing system keep the characteristic of the unit tester, and have also possessed the advantage of the PC. The test function stipulated by standards of vehicle drive safety technology GB7258-2004 was realized. And USB interface was added in order to realize large memory using the U disk.The validity and rationality of the algorithm were proved by the practical car test.