Research And Design Of Vehicle Travelling Data Recorder

Vehicle Travelling Data Recorder(VTDR) is a digital electronic device,which can record and store vehicle speed,real time,mileage and vehicle's other status information.Those messages can be outputted to other device through special transfer interface.It is consisted of the host, the speed sensors and data analysis software.It is important to keep the drivers from tired-driving,overspeed and traffic accidents.It plays a very important role in transportation management.It can also offer scientific,faithful initial data for the pointsman to analyze and to manage traffic accidents.The host of VTDR is researched in this thesis.The switch-type Hall sensor is used to collect the pulse of vehicle speed.The count methods used by vehicle character coefficient,speed and mileagle are described. Focus on the accident data and historical data storage format.The printer is researched independent in the thesis.The font of LCD display and thermal printer is defined.The background and reseach actuality of VTDR are introduced in the thesis.The definition,composing and other glossaries of VTDR are expatiated.The design of VTDR is confirmed.Hardware framework and MCU are introduced in this paper.Hardware units are composed of data collection,storage,display,printer and data communication.The design of driver ID,realtime clock,speed and mileage is expatiated in detail.The methods used by data collection units are designed.The design of data storage format,LCD and thermal printer is expatiated in detail.Finish the design of the underlying driver and code programming.Corresponding processing chart of software design is described.The thesis ends with testing,summing-up and prospect.The function of data collection,storage,display and printing can be achieved.The research results of the paper are summarized.Some parts of VTDR which should be improved and upgraded are expatiated.