Data Definition And Test Bench Of Automobile Cluster With CAN

Automotive electronic has been developed very quickly in the recent years, the customers need also always more comfort equipment on the car. More and more information must be displayed on the cluster of the automobile. On 1970's only about 10 signals are displayed on the cluster, but now on some car more than 40 signals are displayed on the cluster. Bus technology can simplify the wire harness of automobile very much, so to use BUS is a trend of development of automotive cluster.This study has first researched the current situation and develop trend of the automotive cluster, analyzed several different display method, introduced the communication mechanism of CAN—the most widely used BUS System on automobile. This study has then developed the topology of the whole car network, including the nodes of engine ECU, gearbox ECU, Airbag ECU, ABS ECU, Cluster and so on. The cluster is handled here as a focused point. The communication data with cluster are sorted and defined, priority, interval, reference and constant of the messages are determined. OSEK communication (OSEK COM) is a uniform communication environment for automotive control unit application software. The OSEK COM specification increases the portability of application software modules by defining common software communication interfaces and behaviour for internal communication and external communication. Based on OSEK COM, this study has defined transport protocol, which is needed when more than 8 byte information must be transported one time, on this basis can application such as diagnostic and secret code be developed. To test a cluster in the constructions phase, this study has constructed a test bench with common tool from company Vector: CANoe, CANstress and CAN scope. Control and display panel, CAPL programming are finished in the construction of the test bench. With this test bench, we can test the property of the being developed cluster such as sampling rate, ability of antidisturbance, action on CAN message. This is very helpful for the construction of the cluster. This test bench has been in put into use. It's proved very useful. So the construction in this study is feasible and right.