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Research on Design of In-Vehicle CAN/FLEXRAY Gateway Technology

Author: ZhangJiaXu
Tutor: PeiRun
School: Harbin Institute of Technology
Course: Control Science and Engineering
Keywords: CAN gateway Static Low Power CAN / FlexRay gateway Data Integrity
CLC: TP273
Type: Master's thesis
Year: 2010
Downloads: 237
Quote: 2
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Abstract

As electronic technology and the rapid development of semiconductor technology, electronic products in automotive applications more and more, resulting in vehicular networks exist multiple criteria, multiple sub-networks. Car vehicle network gateway as the core, to achieve information exchange between different subnets. This article is based on the actual needs of the project, the realization of CAN in-vehicle information exchange between subnets and CAN-CAN gateway subnet subnet information interact with FlexRay automotive CAN / FlexRay gateway key design techniques are studied. In-vehicle CAN gateway design of the study, this paper will be structured design ideas CAN gateway functionality is divided into six components to implement, and one of the static low-power design techniques, message routing technology, design and timing of the port structural design technology for the in-depth study. Thinking based on finite state machine design CAN gateway technology can achieve low-power static subnet CAN all electronic control units in the vehicle latch into the dormant state, reducing the energy consumption of the battery. CAN node design based on CAN Reference Model mapping information between subnets and triggering can quickly complete gateway routing function, reduce gateway routing packets delay. Reference clock divider, using a single linked list structure design timing gateway system components can meet the accuracy requirements of the other components of the clock conditions, reducing system CPU occupancy time. Meanwhile, the paper design of CAN gateway port structure can effectively avoid the bus high impact loads on the gateway and the gateway to the bus transient shock. In-vehicle CAN / FlexRay gateway design study, we adopt double buffer structure to ensure FlexRay protocol format data into a data format when the CAN protocol data integrity requirements, a \way to quickly achieve FlexRay data packets to the target domain CAN message data field copy action. Meanwhile, the CAN protocol format data into FlexRay protocol format data, this paper writes scheduling algorithm using quadratic overcome application for FlexRay controller transmit buffer status is not visible. Finally, the paper-based test system for vehicle-vehicle gateway CAN gateway and car CAN / FlexRay gateway designed to verify the validity. Experimental results show that the vehicle CAN gateway in the normal working state can achieve rapid information exchange between subnets CAN, after some time in the vehicle latch can coordinate different subnets on the bus and go to sleep under heavy load conditions of normal operation. Meanwhile, the vehicle CAN / FlexRay gateway test results show that, CAN and FlexRay subnet between subnets can be CAN / FlexRay gateway information sharing.

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