The Design Of Automotive Instrument Panel With CAN Bus Based On μC/OS-Ⅱ

The panel of automobile is the key instrument of automobile, through which the driver can get the status infomation of automobile, and the safety of driving is greatly influenced by it. Recently, with the widely using of computer, micro-electronics and field bus communication technology, automobile electronical technology is developing fast, and the traditional mechanical and electrical assembled instrument could not satisfy the need more and more. Especially with the development of automatic drive and satellitic navigation technology, the instrument panel of automobile is expected to become an information center with multifunction of displaying, controlling, communication and entertainment. Modern automotive panel and is developing with digital, intelligentize and network character step by step.After researching traditional automotive instrument and the situation of internal and external automotive instrument technology, the paper present and design a automotive instrument panel based on CAN bus and RTOSμC/OS-II. CAN bus is a kind of serial communication network with high secrecy and good anti-jamming ability, and can effectively support distributed controlling and real-time controlling. CAN bus is used to simplify the communication network in the automobile. It could reduced the quantity of wire and improve the security.μC/OS-II is adopted to improve the real time performance of the program and make it extensible. The way of replantμC/OS-II to aim MCU is well introduced in the paper. 32 bit ARM7 MCU LPC2119 is adopted as the controller. The design measure the parameters such as speed, engine rotate speed, mileage, engine oil pressure, brake air pressure, voltage of battery and cooling water temperature, and change them into digital parameter. 5' color LCD and step motor is used as display terminal. The product has port to connect to PC, which is useful when the software need to be upgraded. In addition, the panel is a node of CAN network, so it could supply connection and controlling to nearby equipment.The structure of instrument panel designed in the paper is well simplified compared to traditional panel. It is advanced in network controlling and is much more safe, trusty and universal. The design improve the safety of driving in a great degree. At an advanced angle to overview the automobile market, it should be important to the design of automobile instrument panel.