The Design And Achieve Of Bus Interknit System Based On Controller Area Network

With the development of computer technology, countries on European three motor vehicle emissions regulations set strict requirements and people for the demand of passenger safety, comfort, efficiency. European Three-engine, ABS/ASR anti-lock, ECAS balloon take-off and landing, Car entertainment systems Etc. Electronic control modules and electronic products in the application of bus more and more extensive, and The traditional point-to-point switch, Relay logic control, Analog transmission has been unable to meet the development needs of passenger electrical intelligent control design. The units of the author- Zhongtong Bus Co., Is a professional low-grade bus companies that produce high, medium and large-scale production ,It has 50 years experience of doing bus system, At present with an annual output of 8,000 buses, the output value of more than 18 million, Export income-generating more than 5 billion. The author as a mainly R & D personnel of the bus electrical system of company technology center , in the bus electrical systems design for many years, Have a certain design application of theoretical knowledge and practical experience in the front line, It is based on market trends and the Company with requirements of the bus electronics technology innovation and development, Proposed and led the Development of the system, After several tests of the system, commissioning, It have been successfully applied in the high two large (including two high) above models in our company, Fully meet the demand of market and design. The main tasks of this system are as follows:(1) This system embeds microprocessor technology, bus interconnected system based on CAN bus instead of the traditional Internet Electric Bus point-to-point control. a single relative, an independent unit control and a simple wire connection.(2) On base of a deep study of CAN bus technology and electrical control of the bus, design bus combination of instruments which based on the CAN bus system, before and after the input and output module. Implement detection, control, transmission and display of electrical passenger information.(3) Combination instruments main implements transmission and display of the electrical information, make module PIC18F8585 which can strengthen the CAN control microcontroller as a central controller,PIC18F8585 control TJA1040 CAN bus driver realized the CAN bus to receive and send information; communicate with the stepper motor drive MC33970 through SPI way ,control the stepper motor speed, engine speed, cooling water temperature, oil pressure, fuel capacity, voltage, pressure and depression 281 parameters of the real-time display; LCD display control mileage accumulated mileage and all kinds of work, the police instructions, Fan Bing button control LCD display; control LED indicator shows that bus electrical fault and status information.4)input and output module main implements transmission and control of the electrical information, using PICI8F8585 SCM as a central controller to control the importation module to detection speed, engine speed, and other eight switches and a variety of parameters, the information will be distributed to focus on electronics, and then through the power output module lights to control all kinds of relays, the implementation of the corresponding motor function, sent the collected information to the combination instrument to display through the instrument driver of TJA1040, and implements information sharing.