| Vehicle traveling data recorder (VTDR) is a special digital electronic recorder which used to acquire and store vehicle's traveling speed, time, distance and other related status information, and then transmit data via USB and RS232 interface. The use of vehicle traveling data recorder can not merely halt the break in trafic rules and regulations, restrain the drivers from being drive at bad habit, and can prevent the traffic accident effectively, it can also offer scientific, faithful initial data for the tipstaffs carries on the accidents. So it plays a very important role in transportation management. Aimming at the actuality of the VTDR research, a VTDR is designed in this paper which bases on the 51 MCU. It also has some characteristics such as real-time, high dependability and less cost.First, VTDR's background and reseach actuality are introducted in the pape. By analyzed the system requirement of VTDR, the system is consisted of data acquisition sub-system, data storage sub-system and correspondence interface sub-system.And then, hard ware framework is introduced in this paper. And the methods in which every function units of the recorder is designed are also discussed. Those function units mainly include power supply, real-time clock, data collection, data store, data communication, human and machine interface.At last, in the part of software design, the flow of every task's software is described in the paper, based on the functions of VTDR. It makes use of SL811HS to realize USB HOST function, gets the data from recorder conveniently and swiftly through U disk. Have done more detailed explanation in the key technology of USB Host. Such as enumerating device, Bulk-Onlyt ransmit protocol and FAT16 files ystem. Otherwise, several measures of anti-jamming are adopted in the process of hardware and software designing.Finally, summarize the all design, point out that needed improvement the prospect of the future of The Vehicle Traveling Data Recorde. |
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