CN110901568A

CN110901568A - Novel vehicle-mounted network with redundancy backup function

Info

Publication number: CN110901568A
Application number: CN201911229296.3A
Authority: CN
Inventors: 范志容; 吴泽民; 冯超; 李敏; 马晨
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-03-24
Anticipated expiration: 2039-12-04
Also published as: CN110901568B

Abstract

The invention discloses a new vehicle-mounted network with redundant backup function, which includes multiple domain controllers and multiple ECUs, the CAN bus interfaces of each domain controller communicate through the CAN bus, and the CAN bus interfaces of each domain controller The bus interface is also connected to the OBD interface through the CAN bus. The CAN-FD bus interface of each domain controller uses the CAN-FD bus for communication. Each domain controller is connected to the ECU with CAN communication function through the CAN interface. Domain controllers are connected to ECUs with LIN communication functions through LIN interfaces, and each domain controller is connected to ECUs with Ethernet communication functions through Ethernet interfaces. The present invention can ensure the real-time performance of signal transmission among the domain controllers, as well as functional safety redundancy.

Description

Novel vehicle-mounted network with redundancy backup function

Technical Field

The invention relates to the technical field of automotive electronics, in particular to a novel vehicle-mounted network with a redundancy backup function.

Background

With the development of automotive Electronic technology, more and more electrical components are mounted on an automobile, and different Electronic Control Units (ECUs) need to exchange information with each other, which requires a bus technology; currently, the automobile bus commonly used in the automobile includes local Interconnect protocol lin (local Interconnect network) and controller Area network can (controller Area network). With the rapid development of electric vehicles and unmanned vehicle technologies and the increase of advanced driving assistance systems and human-computer interaction of vehicles, the traditional CAN bus is more and more inattentive in the aspects of transmission rate, bandwidth and the like.

Disclosure of Invention

The invention aims to provide a novel vehicle-mounted network with a redundancy backup function.

In order to achieve the purpose, the novel vehicle-mounted network with the redundancy backup function comprises a plurality of domain controllers and a plurality of ECUs, wherein CAN bus interfaces of the domain controllers are communicated through CAN buses, the CAN bus interfaces of the domain controllers are also connected with OBD (On-Board diagnostics) interfaces through the CAN buses, the CAN-FD bus interfaces of the domain controllers are communicated through CAN-FD buses, each domain controller is connected with the ECU with the CAN communication function through the CAN interfaces, each domain controller is connected with the ECU with the LIN communication function through the LIN interfaces, and each domain controller is connected with the ECU with the Ethernet communication function through the Ethernet interfaces.

Compared with the traditional CAN bus, the CAN-FD bus has two advantages: 1. the CAN-FD bus adopts variable speed, the highest speed CAN reach 10Mb/s, and the traditional CAN bus only has 1 Mb/s; 2. the method can support higher load, the transmission rate can reach 64 bytes in a single data frame, and the frequent data splitting condition is avoided. The invention adopts a double-bus topological structure of the CAN bus and the CAN-FD bus, CAN meet the diagnosis requirement of the laws and regulations on the vehicle-mounted controller, CAN also meet the transmission requirement of each domain controller on functional safety related bus signals and network safety related bus signals, meets the real-time requirement of bus signal transmission, and CAN realize the real-time property, safety and reliability of bus signal transmission.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

The system comprises a 1-domain controller, a 2-ECU, a 3-OBD interface, a 4-CAN bus, a 5-CAN-FD bus, a 6-CAN interface, a 7-LIN interface and an 8-Ethernet interface.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the novel vehicle-mounted network with the redundancy backup function shown in fig. 1 is characterized in that: the intelligent control system comprises a plurality of domain controllers 1 and a plurality of ECUs 2, CAN bus interfaces of the domain controllers 1 are communicated through CAN buses 4, the CAN bus interfaces of the domain controllers 1 are also connected into OBD interfaces 3 through CAN buses 4, the CAN-FD bus interfaces of the domain controllers 1 are communicated through CAN-FD buses 5, each domain controller 1 is connected with an ECU2 with a CAN communication function through a CAN interface 6, each domain controller 1 is connected with an ECU2 with a communication function through a LIN interface 7, each LIN controller 1 is connected with an ECU2 with an Ethernet communication function through an Ethernet interface 8 (for example, CAN controllers under automatic driving domain controllers comprise an electronic stability system ESC, an electric power steering EPS, an iBooster and the like, the Ethernet controllers comprise millimeter wave radars, high-precision maps and the like, and LIN nodes comprise PM2.5, a skylight motor, a rainfall illumination sensor, an atmosphere lamp and the like).

In the above technical solution, the domain controller is developed from the ECU, and the control strategy of the function is centralized in the domain controller, and the ECU (i.e. the basic controller) connected to the domain controller only includes the control strategy inside the system and the corresponding driver.

In the technical scheme, CAN-FD buses 5 are adopted for transmitting control signals (such as engine rotating speed request, engine torque request and air conditioner control request) and other bus signals (such as vehicle speed, engine rotating speed and gear and the like) with higher real-time requirements among all domain controllers 1, and state signals have low requirements on real-time performance and are transmitted by CAN; the CAN-FD transmission speed for signals with high real-time performance is high.

In the above technical solution, the state type signals (the state of the air conditioner, the state of the door, the state of the safety belt, and the state of the lamp) and other bus signals (such as the signal displayed by the instrument and the signal collected by remote monitoring) with low real-time requirements between the domain controllers 1 are transmitted by the CAN bus 4, so as to ensure the realization of the delay requirements of different network signals.

In the technical scheme, the functional safety ASILC bus signals and the ASILD bus signals are transmitted between the domain controllers 1 on the CAN bus 4 and the CAN-FD bus 5 simultaneously, so that redundancy and backup of the functional safety ASILC bus signals and the ASILD bus signals are realized, and the data safety is guaranteed.

In the above technical solution, bus signals related to network security are transmitted between the domain controllers 1 on the CAN-FD bus 5 to realize encryption of the bus signals related to network security, for example, when a mobile phone APP is used to perform remote window closing and door opening operations, a T-box receives an instruction sent by a background and converts the instruction into a control command in a vehicle, in the above process, a window control command and a door control command need to be encrypted for avoiding interference and destruction, the CAN bus 4 cannot perform transmission of encrypted files due to bandwidth limitation, and the CAN-FD bus 5 CAN perform the encryption.

In the technical scheme, the OBD interface is connected with each domain controller 1 through the CAN bus 4, so that the diagnosis function of the domain controllers 1 is realized.

The communication speed of the CAN bus 4 is 500 Kbit/s. The communication rate of the LIN bus is 19.2 Kbit/s. The communication rate of the CAN-FD bus 5 is 2 Mbit/s. The Ethernet bus follows the 100BASE-T1 communication protocol and has a communication rate of 100 Mbit/s.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.

Claims

1. The utility model provides a novel vehicle mounted network with redundant backup function which characterized in that: the CAN bus interfaces of all the domain controllers (1) are communicated through a CAN bus (4), the CAN bus interfaces of all the domain controllers (1) are also accessed into an OBD interface (3) through the CAN bus (4), CAN-FD bus (5) is adopted for communication among the CAN-FD bus interfaces of all the domain controllers (1), each domain controller (1) is connected with the ECU (2) with the CAN communication function through a CAN interface (6), each domain controller (1) is connected with the ECU (2) with the LIN communication function through an LIN interface (7), and each domain controller (1) is connected with the ECU (2) with the Ethernet communication function through an Ethernet interface (8).

2. The new vehicular network with redundant backup function according to claim 1, characterized in that: the CAN-FD buses (5) are adopted among all the domain controllers (1) for signal transmission of control signals.

3. The new vehicular network with redundant backup function according to claim 1, characterized in that: and the state signals are transmitted among the domain controllers (1) by adopting a CAN bus (4).

4. The new vehicular network with redundant backup function according to claim 1, characterized in that: and the functional safety ASILC bus signals and the ASILD bus signals are simultaneously transmitted on the CAN bus (4) and the CAN-FD bus (5) among the domain controllers (1), so that redundancy and backup of the functional safety ASILC bus signals and the ASILD bus signals are realized.

5. The new vehicular network with redundant backup function according to claim 1, characterized in that: the bus signals related to the network safety are transmitted between the domain controllers (1) on the CAN-FD bus (5) so as to realize the encryption of the bus signals related to the network safety.

6. The new vehicular network with redundant backup function according to claim 1, characterized in that: the OBD interface is connected with each domain controller (1) through a CAN bus (4), and the diagnosis function of the domain controllers (1) is achieved.