KR102585940B1 - Gateway for vehicle Ethernet communication and message routing method thereof - Google Patents

Abstract

The present invention relates to a gateway for automotive Ethernet communication and a message routing method using the same.
In addition, the present invention includes a CAN-Ethernet direct transmission unit that distinguishes direct messages among CAN messages transmitted in a CAN network and routes them to an Ethernet network including an Ethernet controller, and a CAN-Ethernet direct transmission unit that separates direct messages from CAN messages transmitted in a CAN network and By providing a CAN-Ethernet indirect transmission unit that classifies indirect messages and routes them to the Ethernet network, and an Ethernet-CAN transmission unit that routes Ethernet packets transmitted from the Ethernet network to the CAN network, an increase in Ethernet transmission traffic is achieved. It is possible to prevent and secure communication reliability between CAN-Ethernet, and to ensure real-time performance of the CAN network and large-capacity transmission of the Ethernet network.

Description

Gateway for vehicle Ethernet communication and message routing method using the same {Gateway for vehicle Ethernet communication and message routing method thereof}

The present invention relates to a gateway for automotive Ethernet communication and a message routing method using the same.

In general, the internal communication network of a vehicle communicates using a bus structure communication method for each domain. Since the communication method is in the form of a bus structure, in order to transmit messages and signals between ECUs to other domains, a communication gateway is installed inside the vehicle to route messages in a designated message format and communicate. At this time, the period and data size are determined within the CAN communication method and performance range.

Recently, as automotive Ethernet technology has been applied, heterogeneous communication (CAN-Ethernet) routing has been applied, but in order to communicate without changing the existing CAN communication method, each CAN message is transmitted as one Ethernet packet.

In this case, the CAN:Ethernet message exchange method is the same as the CAN communication method, transmitting 1:1, which creates an unreasonable element in terms of Ethernet's high-capacity transmission and transmission efficiency. For example, when sending 30 messages in a 10ms cycle in CAN communication, from an Ethernet packet perspective, they can be transmitted as one packet, but 30 packets must be transmitted, the same as CAN communication.

In other words, when the gateway transmits incoming messages for each CAN domain as Ethernet packets, Ethernet transmission traffic increases unnecessarily. When routing CAN-Ethernet between heterogeneous types, if the CAN message and Ethernet packet ratio is routed at 1:1, the speed and transmission volume of Ethernet have physically increased, but the network topology is configured according to the CAN communication method and standards.

At this time, when messages from multiple CAN domains (body, chassis, powertrain, multimedia) are routed to the Ethernet controller from the perspective of the in-vehicle communication gateway, the number of packets that can be sent at once increases by the number of messages for each CAN domain, increasing the Ethernet transmission traffic. This increases.

In conclusion, the routing communication efficiency between CAN communication (500Kbps, 8byte) and Ethernet communication (100Mbps, 1400byte) decreases and the load on the in-vehicle network increases, eliminating the advantages of automotive Ethernet, and there is a problem of routing with an unreasonable communication structure.

The present invention was developed in consideration of the above problems, and provides a gateway for automotive Ethernet communication that can prevent an increase in Ethernet transmission traffic when routing messages from a CAN network to an Ethernet network, and a message routing method using the same. It has a purpose.

The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The present invention to achieve the above object is a CAN-Ethernet direct transmission that distinguishes direct messages among CAN messages transmitted in a CAN network and routes them to an Ethernet network including an Ethernet controller. wealth; A CAN-Ethernet indirect transmission unit that separates indirect messages from CAN messages and routes them to the Ethernet network; And an Ethernet-CAN transmission unit that routes the Ethernet packet transmitted from the Ethernet network to the CAN network, wherein the Ethernet-CAN transmission unit includes information about the communication cycle set in the header of the Ethernet packet and a predefined offset position. Filters CAN messages based on information about the CAN messages, routes each CAN message according to the filtered communication cycle, and when receiving an Ethernet packet, information about the address or port to send the CAN message is also received, or a map table Alternatively, a gateway for automotive Ethernet communication is provided, characterized in that it obtains information about an address or port to transmit a CAN message based on information defined in a message configuration file.

In addition, the present invention is a message routing method performed in a gateway for automotive Ethernet communication, which distinguishes direct messages among CAN messages transmitted in a CAN network and connects them to an Ethernet network including an Ethernet controller. Can-Ethernet direct transmission step of routing to; A CAN-Ethernet indirect transmission step of distinguishing indirect messages from CAN messages and routing them to an Ethernet network; And an Ethernet-CAN transmission step of routing an Ethernet packet transmitted from an Ethernet network to a CAN network, wherein the Ethernet-CAN transmission step includes information about the communication cycle set in the header of the Ethernet packet and a predefined offset Filters CAN messages based on information about location, routes each CAN message according to the filtered communication cycle, and receives information about the address or port to send the CAN message when receiving an Ethernet packet, or provides a map Provides a message routing method for automotive Ethernet communication, characterized in that information on an address or port to transmit a CAN message is obtained based on information defined in a table or message configuration file.

By solving the problem described above, the present invention has the effect of enabling routing of large messages between Ethernet controllers by storing a plurality of CAN messages received in the CAN network in one Ethernet packet and routing them to the Ethernet network.

In addition, the present invention has the effect of preventing an increase in Ethernet transmission traffic and securing communication reliability between CAN and Ethernet by enabling routing of large messages.

In addition, the present invention can secure real-time performance of the CAN network by routing Ethernet packets according to the communication cycle of the CAN message, and has the effect of enabling multiple routing of CAN messages received from the Ethernet network to the CAN network.

In addition, the present invention has the effect of reducing communication heterogeneity between the CAN network and the Ethernet network and securing versatility that can be used both inside and outside the vehicle.

1 and 2 are diagrams for explaining a gateway for automotive Ethernet communication according to an embodiment of the present invention.
Figure 3 is a diagram for explaining the operation process of the CAN-Ethernet direct transmission unit according to an embodiment of the present invention.
Figure 4 is a diagram for explaining the operation process of the Can-Ethernet indirect transmission unit according to an embodiment of the present invention.
Figure 5 is a diagram for explaining the operation process of the Ethernet-CAN transmission unit according to an embodiment of the present invention.
Figure 6 is a diagram for explaining a message routing method for automotive Ethernet communication.

In the following description, specific details of the present invention are set forth to provide a general understanding of the present invention; however, it is known to those skilled in the art that the present invention can be readily practiced without these specific details and with modifications thereof. It will be self-evident to those who have it.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying FIGS. 1 to 6, focusing on the parts necessary to understand the operation and action according to the present invention.

1 and 2 are diagrams for explaining a gateway for automotive Ethernet communication according to an embodiment of the present invention, and Figure 3 is a diagram for explaining the operation process of the Can-Ethernet direct transmission unit according to an embodiment of the present invention. It is a drawing, and Figure 4 is a diagram for explaining the operation process of the CAN-Ethernet indirect transmission unit according to an embodiment of the present invention, and Figure 5 is a diagram for explaining the operation process of the Ethernet-CAN transmission unit according to an embodiment of the present invention. This is a drawing for this purpose.

1 to 5, the gateway 100 for automotive Ethernet communication according to an embodiment of the present invention includes a Can-Ethernet direct transmission unit 110, a Can-Ethernet indirect transmission unit 120, and an Ethernet-Ethernet direct transmission unit 110. It is configured to include a can transmission unit 130.

The CAN-Ethernet direct transmission unit 110 distinguishes direct messages among CAN messages transmitted from the CAN network 10 and routes them to the Ethernet network 20 including the Ethernet controller. do.

As shown in FIG. 3, the CAN-Ethernet indirect transmission unit 120 can route a plurality of direct messages into one Ethernet packet. To this end, the direct messages are stored in a memory or buffer and converted into an Ethernet packet. can be created, information about the communication cycle of direct messages can be set in the header of the Ethernet packet, and then routed to the Ethernet network 20.

Here, direct messages are stored in a memory or buffer to be classified according to a communication period of 10ms, 20ms, 50ms to 1000ms, and information about the communication period set in the header of the Ethernet packet is a bit set to '0' or '1'. It can be stored as a Map (Bitmap) value.

For this purpose, a map table or message setting file in which the characteristics of all CAN messages are defined can be prepared in advance, and the map table or message setting file contains the start position and offset (offset) of the Ethernet packet for each CAN message or CAN signal. Offset), communication cycle, information on sending and receiving addresses including IP and port are defined, and can be defined in a peer-to-peer manner with the Ethernet controller that will receive the CAN message.

In addition, the CAN-Ethernet direct transmission unit 110 periodically routes Ethernet packets according to the minimum communication cycle, but in the case of a CAN message received as an event message, it may be exceptionally routed to the Ethernet network 20 in real time.

The CAN-Ethernet indirect transmission unit 120 distinguishes indirect messages from CAN messages and routes them to the Ethernet network 20.

As shown in FIG. 4, the CAN-Ethernet indirect transmission unit 120 can route a plurality of indirect messages or indirect signals as one Ethernet packet, with a predefined offset in memory or buffer. Ethernet packets can be created by sequentially storing each indirect message in a location, and information about the communication cycle of the indirect messages can be set in the header of the Ethernet packet and then routed to the Ethernet network 20.

In this case as well, the offset position where the direct message is stored is defined by the map table or message setting file described above, and the information about the communication cycle set in the header of the Ethernet packet is a bit set to '0' or '1'. It is stored as a map value.

In addition, the CAN-Ethernet indirect transmission unit 120 periodically routes Ethernet packets according to the minimum communication period, but if the indirect message is an event message, it routes it to the Ethernet network 20 in real time.

The Ethernet-CAN transmission unit 130 routes Ethernet packets transmitted from the Ethernet network 20 to the CAN network 10.

As shown in FIG. 5, when an Ethernet packet is received, the Ethernet-CAN transmission unit 130 transmits a CAN message according to information about the communication cycle set in the header of the Ethernet packet and information about the predefined offset position. They can be filtered and stored in memory or a buffer, and each CAN message can be routed to the CAN network 10 according to the filtered communication cycle.

In addition, when receiving an Ethernet packet, the Ethernet-CAN transmission unit 130 may also receive information about the address or port to transmit the CAN message, and may transmit the CAN message based on information defined in the map table or message setting file. You can also obtain information about the address or port to transmit.

Figure 6 is a diagram for explaining a message routing method for automotive Ethernet communication.

Referring to FIG. 6, a message routing method for automotive Ethernet communication performed in the gateway 100 for automotive Ethernet communication according to an embodiment of the present invention will be described.

However, since all functions performed in the message routing method for automotive Ethernet communication shown in FIG. 6 are performed in the gateway 100 for automotive Ethernet communication described with reference to FIGS. 1 to 5, even without explicit explanation, FIG. All functions described with reference to FIGS. 1 to 5 are performed in the message routing method for automotive Ethernet communication according to a preferred embodiment of the present invention, and all functions described with reference to FIG. 6 are performed in the message routing method for automotive Ethernet communication according to a preferred embodiment of the present invention. It should be noted that this is performed as is in the gateway 100 for Ethernet communication.

First, the gateway 100 distinguishes direct messages from CAN messages transmitted in the CAN network and routes them to the Ethernet network 20 including the Ethernet controller (S100).

At this time, the gateway 100 may separate direct messages by communication cycle and store them in a memory or buffer, and route Ethernet packets with information about the communication cycle of the stored direct messages set in the header to the Ethernet network 20.

Next, the gateway 100 distinguishes direct messages from can messages and routes them to the Ethernet network 20 (S200).

At this time, the gateway 100 sequentially stores the indirect messages at a predefined offset position and routes an Ethernet packet with information about the communication period of the stored indirect messages set in the header to the Ethernet network 20. .

In addition, the above-mentioned offset position can be defined in advance by a map table or message setting file, and the map table or message setting file includes the start position and offset of the Ethernet packet for each CAN message or CAN signal, Information about transmission and reception addresses, including communication cycle, IP, and port, can be defined.

Meanwhile, the above-described steps S100 and S200 may periodically route Ethernet packets according to the minimum communication cycle, but exceptionally, if the CAN message is an event message, they may be routed to the Ethernet network 20 in real time.

Next, the gateway 100 routes the Ethernet packet transmitted from the Ethernet network 20 to the CAN network 10 (S300).

At this time, the gateway 100 may filter CAN messages based on information about the communication cycle and information about the offset position set in the header of the Ethernet packet, and route each CAN message according to the filtered communication cycle.

Meanwhile, when step S300 is completed, the above-described step S100 can be repeated again, and step S100, step S200, and step S300 may be performed simultaneously.

Although preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately modified within the scope stated in the claims.

100: gateway
110: CAN-Ethernet direct transmission unit
120: CAN-Ethernet indirect transmission unit
130: Ethernet-CAN transmission unit

Claims (2)

A CAN-Ethernet direct transmission unit that separates direct messages from CAN messages transmitted in a CAN network and routes them to an Ethernet network including an Ethernet controller;
A CAN-Ethernet indirect transmission unit that separates indirect messages from CAN messages and routes them to the Ethernet network; and
It includes an Ethernet-CAN transmission unit that routes Ethernet packets transmitted from the Ethernet network to the CAN network,
The Ethernet-CAN transmission unit,
Filters CAN messages based on information about the communication cycle set in the header of the Ethernet packet and information about the predefined offset position, and routes each CAN message according to the filtered communication cycle.
When receiving an Ethernet packet, information about the address or port to which the CAN message will be transmitted is also received, or the address or port to which the CAN message will be transmitted based on information defined in the map table or message setting file where the characteristics of all CAN messages are defined. A gateway for automotive Ethernet communication characterized by obtaining information about the port.
A message routing method performed in a gateway for automotive Ethernet communication,
A CAN-Ethernet direct transmission step of distinguishing direct messages from CAN messages transmitted in a CAN network and routing them to an Ethernet network including an Ethernet controller;
A CAN-Ethernet indirect transmission step of distinguishing indirect messages from CAN messages and routing them to an Ethernet network; and
It includes an Ethernet-CAN transmission step of routing Ethernet packets transmitted from the Ethernet network to the CAN network,
The Ethernet-CAN transmission step is,
Filters CAN messages based on information about the communication cycle set in the header of the Ethernet packet and information about the predefined offset position, and routes each CAN message according to the filtered communication cycle.
When receiving an Ethernet packet, information about the address or port to which the CAN message will be transmitted is also received, or the address or port to which the CAN message will be transmitted based on information defined in the map table or message setting file where the characteristics of all CAN messages are defined. A message routing method for automotive Ethernet communication, characterized by obtaining information about the port.