Priority strategy-based signal routing conversion method and device

Abstract

The invention provides a priority strategy-based signal routing conversion method, which comprises the following steps of: S1, accessing Ethernet network nodes into a central gateway through an Ethernet interface, and accessing CAN network nodes into the central gateway through a CAN interface; and S2, enabling the signal data connected with the Ethernet to flow into a central gateway through an Ethernet network, judging the priority of the received signal data by the central gateway, classifying the signal data into a queue according to the priority, and then forwarding the signal data with different priorities according to a preset rule. Cache allocation can be carried out on the dynamic cache space at the pre-allocation moment, and the size of the dynamic cache can be adjusted accordingto the size of the signal data and the priority in the preset time period. Under the condition of ensuring that priority data can be transmitted preferentially, the problem of packet loss based on data transmission between a vehicle-mounted Ethernet network and a CAN network is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of signal route conversion, in particular to a signal route conversion method and conversion device based on a priority strategy. Background technique [0002] With the popularization of automobiles, more and more automobiles have entered thousands of households. With the continuous improvement of people's living consumption level, the number of automobiles has also continued to increase. Everyone has higher and higher requirements for the intelligence of electrical appliances in the car. While the requirements for smart car data are increasing, it also brings a bottleneck in the transmission of large-flow data. Usually, smart driving or driverless cars need to be equipped with cameras and radars. The image data obtained by the camera and the points obtained by the radar Cloud data, through the built-in algorithm calculation, the acquired data is analyzed and calculated to operate the car for driving. Under...

AI Technical Summary

Problems solved by technology

One end of the China Network Gateway is connected to the vehicle Ethernet network, and the other end is connected to the CAN network. Signal data (such as control signals) need to be routed and forwarded at the central gateway. The conventional processing method is to receive and forward immediately. When the Ethernet side is waiting to be forwarded, the Ethernet gateway device will experience data congestion, and it is too late to forward. The general processing method is to discard the signal data packets that are too late to be forwarded.

In addition, when there are high-priority signal data waiting to be forwarded in the car, there is no priority forwarding, and it is still forwarded as received, especially when there is congestion, the high-priority data also has the risk of loss

[0003] The maximum bandwidth of Ethernet generally reaches 100M, and the maximum bandwidth of CAN interface generally reaches 2M. Then, for example, a large amount of data arrives at the Ethernet interface in a short period of time and waits for forwarding by the forwarding device. (For example, 10 frames of data within 1us) when the Ethernet data is forwarded by the gateway device The following problems will be encountered in the CAN bus: 1. When a large amount of data on the Ethernet interface arrives at the forwarding device, because of the CPU processing capacity and the CAN bus transmission capacity, the existing signal data cannot be forwarded in a short time, resulting in congestion; 2. After congestion occurs, many processing methods will lose the signal data that is too late to process, which is an extremely dangerous processing method; 3. After transmission congestion, when the key signal data of the car needs to be forwarded, it will also be delayed or even discarded due to congestion. very dangerous

At present, peers have a way of queue buffering to deal with congestion, but it does not solve the delayed transmission of key signal data when congestion occurs, and we use it to provide an effective solution

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