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Communication method and system among multiple vehicle-mounted micro-control units

A technology of micro control unit and communication method, which is applied in the field of vehicles, can solve the problems of unfavorable ECU miniaturization, LIN bus communication rate cannot meet the communication requirements of complex application scenarios, and high complexity of system hardware, so as to reduce design difficulty and improve robustness , the effect of simplifying the difficulty

Inactive Publication Date: 2020-05-08
GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In an electronic control unit composed of multiple MCUs, the communication rate of the LIN bus cannot meet the communication requirements of complex application scenarios.
However, buses such as CAN and Flexray require additional transceiver circuits, and the system hardware complexity is high, which is not conducive to the miniaturization of ECU.

Method used

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  • Communication method and system among multiple vehicle-mounted micro-control units
  • Communication method and system among multiple vehicle-mounted micro-control units
  • Communication method and system among multiple vehicle-mounted micro-control units

Examples

Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 , figure 1 It is a general serial port connection topology diagram among multi-vehicle micro-control units disclosed in the embodiment of the present invention. The multiple microcontroller units (Microcontroller Units) are referred to as MCUs for short. This embodiment uses four micro-control units as an example for illustration, such as figure 1 In the topological diagram, there are four physical serial links, which are the Uart0 serial port of MCU1 and the Uart0 serial port of MCU2, the Uart1 serial port of MCU1 and the Uart0 serial port of MCU4, the Uart2 serial port of MCU1 and the Uart0 serial port of MCU3, and the Uart1 of MCU3 Serial port and Uart1 serial port of MCU4. The four micro control units receive and send data through the four serial port links.

[0034] The above topology diagram is only used as an example to illustrate the embodiment of the present invention, and the number of the micro-control units and the serial port physical link ...

Embodiment 2

[0036] Such as figure 2 as shown, figure 2 It is a schematic flow chart of the communication method between multi-vehicle micro-controller units disclosed in the embodiment of the present invention. The embodiment of the present invention is based on the general serial port connection topology diagram of the above-mentioned various vehicle-mounted microcontroller units, and the communication method between the various MCUs is made. To further illustrate, wherein the general-purpose serial ports between the plurality of micro-control units are connected in pairs according to the needs of message transmission, and the application layer messages of the plurality of MCUs are encapsulated according to a preset message structure, and the method includes the following steps:

[0037] S11. The first micro-control unit invokes the Wrapper interface, and pushes the ID, length and content of the message to be transmitted to the corresponding general-purpose serial port channel to send ...

Embodiment 3

[0043] Yet another embodiment of the present invention provides a communication system among multiple vehicle-mounted micro-control units, and the communication system is composed of software modules. image 3 It is a software structural diagram of the communication system of the multi-vehicle micro-control unit, including a message sending and receiving module, a channel scheduling module, a message management module, and a data transmission control module, wherein,

[0044] 1. The message sending and receiving module is used to send and receive messages between the on-board micro control units;

[0045] The message transceiving module executes the sending and receiving operation of the message by calling the wrapped Wrapper interface. When the first vehicle-mounted micro-control unit sends a message to the second vehicle-mounted control unit, it calls the Wrapper interface to perform the sending operation, and the second vehicle-mounted control unit receives the first vehicle-m...

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PUM

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Abstract

The invention discloses a communication method among multiple vehicle-mounted micro-control units. The method comprises the steps that a first micro-control unit calls a Wrapper interface and pushes the ID, the length and the content of a message to be transmitted to corresponding universal serial port channels so as to send the message, and each universal serial port channel is formed by pairwisecorresponding connection of universal serial ports for message transmission among multiple micro-control units; and the second micro-control unit calls a Wrapper interface to obtain cache informationof the specified message ID in the message list so as to receive the transmitted message. The invention further discloses a communication system among the multiple vehicle-mounted micro-control units. The overall design difficulty of system software can be reduced, and robustness of the system is effectively improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a communication method and system between multi-vehicle micro control units. Background technique [0002] At present, the communication between electronic control units of automobile ECU (Electronic Control Unit) is generally carried out on buses such as LIN, CAN, and Flexray. The communication rate of the LIN bus is 20kbps, which is a lower speed. The CAN bus generally works at 500kbps, and the speed of CANFD can reach 2Mbps. Each ECU participating in the communication needs a transceiver circuit. The maximum operating rate of the Flexray bus can reach 10Mbps, and each ECU also requires a dedicated transceiver circuit. [0003] As cars become more and more intelligent and networked, the complexity of automotive electronic systems is getting higher and higher, and the functions of ECUs are becoming more and more powerful. The ECU board also develops from a single MCU circuit...

Claims

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Application Information

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IPC IPC(8): G06F13/42G06F13/16G06F9/54
CPCG06F9/544G06F13/1684G06F13/4282
Inventor 韦书锦李泽生
Owner GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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