Research And Design Of The Automotive Vitual Instrument System Based On CAN Bus

Along with the rapid development of automotive electronical technology, CAN (Control Area Network), an advanced technology in communication network, applies in automotive instrument system, and it will take the place of the intrinsic mechanical electrical traditional instruments in the end. The virtual instrument system base on automotive CAN bus just like a CAN node, it shares the resource with many others ECUs, Electrical Control Unit, in the auto. And in the future, virtual instrument system is gradually developing an integration system whit multifunction display, automatic drive and multimedia entertainment.This paper researches automotive instrument based on CAN bus, deeply discusses the idea and the method of system design and brings forward the approach of design the automotive emulational virtual instrument system on the platform of LabVIEW software.Firstly, we make up the most simple CAN with two CAN nodes, we call the node one nether node, it's composed with P89C51 microcontrollor, SJA100 CAN controller, TJA1050 transceiver; the node two is upper node which is designed on personal computer. When we have the software designed with them, they can find each other and transmit or receive date in two ways in controlling the CAN communication interface card. When the upper node received a CAN signal, it will deal with the signal, and we can get the key information from it based on application layer protocol of CAN. The instruments in the vitual instrument system are drived by the real data we got, also we will save these signals. It is the most important and difficult that we design the virtual instrument system with LabVIEW. In the system, not only the advantages of traditional instrument are reserved in emulational way, but also it has the digital display, many kinds of informations in Chinese letters caution, and sound alarm informing. It is easy that we need upgrading or extending the system.The research of this system has been proved to be of great signification by practice. However, we need more improvements before application.