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Method for carrying out communication capacity expansion on static segment of vehicle-mounted electronics bus

A technology for in-vehicle electronics and in-vehicle bus. It is applied in the direction of bus network and data exchange through path configuration, which can solve the problems of bandwidth waste and static frame occupation.

Inactive Publication Date: 2013-01-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

FlexRay static frames are sent strictly according to the message cycle, but static frames will occupy a static slot
If all NMPDUs occupy a static slot and their sending cycle is much longer than the communication cycle, bandwidth is wasted

Method used

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  • Method for carrying out communication capacity expansion on static segment of vehicle-mounted electronics bus
  • Method for carrying out communication capacity expansion on static segment of vehicle-mounted electronics bus
  • Method for carrying out communication capacity expansion on static segment of vehicle-mounted electronics bus

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Embodiment Construction

[0060] FlexRay's time-driven model not only allows time determinism, but is also a paradigm of modularity and scalability. Each node only needs to know the static slots for sending and receiving communications. The detailed information of these static slots is stored in the local configuration table. There is no global description. Each node only operates on its own synchronization cycle. As long as the local tables are consistent there will be no time conflicts or interference. Free static slots in virtual global tables composed of local tables can be used for future expansion.

[0061] The method for expanding the communication capacity of the static section of the vehicle-mounted electronic bus according to the present invention mainly focuses on the configuration of the static section. The static segment is divided into multiple static slots of equal length, each ECU can be assigned to one or more static slots, but each static slot can be mapped to at most one ECU. Based...

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Abstract

The invention discloses a method for carrying out communication capacity expansion on a static segment of a vehicle-mounted electronics bus. The method comprises the following steps: 1, determining the attributes and sending / receiving relations of tasks and messages of an ECU (electronic control unit); 2, assigning the tasks for sending signals to a sensor, assigning the tasks for receiving signals to an actuator, and assigning the rest tasks for sending and receiving signals to each ECU; 3, completing the ascription of each static slot, the mapping from the signals to the static slots and the dependence between task allocation and message configuration; and 4, establishing a configuration system for the tasks and massage data of the sensor, the ECU and the actuator according to the step 3, and solving the required minimum number of the static slot. Compared with the prior art, the method provided by the invention has the advantages of reducing the number of the static slot on a FlexRay bus and occupied by a distributed application system in the process of communication and being favorable for future system upgrade and expansion.

Description

technical field [0001] The invention relates to performance improvement of a vehicle-mounted electronic bus, in particular to a method for expanding the communication capacity of a static segment of the vehicle-mounted electronic bus. Background technique [0002] In today's high-end cars, there may be more than 70 electronic control units connected by several buses in the car, and the communication messages between these electronic control units are also increasing with the development of applications. This puts more demands on high certainty, low latency and high accuracy in the car. [0003] The FlexRay communication protocol supports 10Mbit / s bandwidth and multiple topologies. It is a new generation of on-board computer (ECU) bus developed by the FlexRay Consortium and is suitable for high-speed automotive networks. It has high transmission rates, hard real-time, and security. characteristics of flexibility and flexibility. The FlexRay bus adopts a periodic communicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/40
Inventor 顾宗华李红李楠孙征杨国青吴朝晖
Owner ZHEJIANG UNIV
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