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发表于 28-5-2015 22:31:55
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canoe相关
摘要
电控技术是纯电动车的关键技术之一,纯电动汽车除了要继承传统内燃机汽车原有的汽车电子技术外,如电子防滑控制系统、安全气囊等,还要根据自身的特点,研发出适合自身的电子单元如电池管理单元等,随着电子控制系统的增多,对系统之间的合作及可靠性的要求增加,采用 CAN 总线通信技术,不仅可以实现电控单元之间的数据信息共享,还能提高数据传输的可靠性及实时性。
本文从纯电动车整车 CAN 网络角度出发,研究了其整车 CAN 网络结构。首先,根据某纯电动车的特点及 CAN 总线网络的功能需求和实时性需求,研究并设计了其整车的 CAN 总线网络架构,分为两个子网络:高速 CAN 子网络,包括整车控制器、电机控制器等节点;低速 CAN 网络,包括车身舒适系统及仪表,其中仪表控制器作为网关。确定了网络节点之间的通信流程及通信内容。然后基于 J1939 协议,设计了纯电动车 CAN 总线网络的通信协议,其中重点设计了应用层协议,包括优先级分配、源地址分配、参数组定义、数据场参数信息定义等。接着,利用总线开发工具 CANoe,建立了 CAN 网络仿真模型,为后续验证 CAN通信协议提供了依据。最后,通过 RMA 方法进行 CAN 网络的实时性分析,并利用仿真模型进行了仿真测试分析。
通过对实时性分析及仿真测试结果的分析,可以得出:本文设计的电动车CAN 网络结构及其通信协议满足系统的通信需求,实时性好且总线通信情况良好。本文将基于 SAE J1939 协议的 CAN 网络设计应用到某纯电动汽车的研发中,并取得了较好的效果,具有很好工程应用价值。
关键词: 纯电动车;CAN总线;通信协议;CAN网络模型;仿真
 
Abstract
Electronic control technology is one of the key technologies of electric vehicle, in addition to original automobile electronic technology in the traditional ICE vehicle, such as ABS, air bags, etc., pure electric vehicle also develop electronic units such as battery management unit, etc. according to its own characteristics. Along with the increase in electronic control systems, the requirement of the cooperation and reliability between the systems are also increased, the CAN-bus communication technology can effectively solve this problem, it can not only realize data sharing, but also improve the reliability and real-time performance of data transmission.
This paper researches on CAN network structure of the pure vehicle in terms of its CAN network as a whole. First of all, according to the characteristics of a pure electric vehicle and real-time and function requirements of a CAN bus network, researches and designs of the vehicle CAN bus network architecture, which contains two sub networks: one is high-speed CAN sub network, it includes motor control unit etc., the other is low-speed CAN sub network, it includes the body comfortable system and the instrument controller which is take as a gateway, and determines the communication process and content between network nodes. Then based on the J1939 protocol, designs CAN network communication protocols, in which the application layer protocol is the key, it includes the priority assignment, source address distribution, parameter definition etc. Then, establishes the CAN network simulation model using the CANoe, which provides a basis for the validation for the CAN communication protocol. Finally, analyses the real-time performance through the RMA method, and make a test for the CAN network by using the model simulation.
Results from the analysis for the CAN network show that the CAN network structure and communication protocol designed for the electric vehicle meet the communication requirements, have good real-time performance. This paper design the CAN network based on J1939 protocol for a pure electric vehicle, and achieved good effect, which states that it has the very good project application significance.
Key Words: Electric Vehicle; CAN Bus; Communication Protocol; CAN Network Model; Simulation
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