CN-122002327-A - ASIL-D level vehicle-mounted data transmission method and system

CN122002327ACN 122002327 ACN122002327 ACN 122002327ACN-122002327-A

Abstract

The application provides an ASIL-D level vehicle-mounted data transmission method and system, wherein the method comprises the steps of controlling a first WIFI module to be in a working state and a second WIFI module to be in a closing or sleeping state when the vehicle-mounted data transmission quantity is smaller than a preset threshold value, controlling the first WIFI module and the second WIFI module to be in the working state simultaneously when the vehicle-mounted data transmission quantity is larger than or equal to the preset threshold value, and triggering the second WIFI module to switch from the closing or sleeping state to the working state to take over the first WIFI module to realize data transmission when the first WIFI module is abnormal or damaged. According to the application, two WIFI modules which are coordinated and matched with each other are adopted to realize vehicle-mounted data transmission of ASIL-D level, the two WIFI modules can work together, and when one of the WIFI modules is abnormal, the other WIFI module can replace the work in time, so that the data transmission is ensured not to be disconnected, and the stability and the high efficiency of the vehicle-mounted data transmission are obviously improved.

Inventors

CHEN XUEHUA
CHEN WEIHUA
LIN XIZE
WANG LONGCUN
LIU BIN
CHEN YONG
Xu shiding
CHEN CHANGFU
ZHENG HANXIANG
Fang Xiongjiang
Ye Wangcai

Assignees

福州理工学院

Dates

Publication Date: 20260508
Application Date: 20260127

Claims (8)

1. An ASIL-D class on-board data transmission system, comprising: The system comprises a main control unit, a double WIFI module, a double RF circuit module, an interface module and an interaction coordination module; The dual WIFI module comprises a first WIFI module and a second WIFI module which are mutually independent and can work cooperatively, and is used for establishing wireless connection with external WIFI equipment and realizing data transmission; The dual-RF circuit module is connected with the dual-WIFI module in a one-to-one correspondence manner and is used for receiving and transmitting the wireless signals of the first WIFI module and the second WIFI module; The interface module comprises a first interface and a second interface, one end of the first interface is connected with the first WIFI module, and the other end of the first interface is connected with the main control unit and is used for controlling the first WIFI module and realizing data communication between the first WIFI module and the main control unit; One end of the second interface is connected with the second WIFI module, and the other end of the second interface is connected with the main control unit and is used for controlling the second WIFI module by the main control unit and realizing data communication between the second WIFI module and the main control unit; And two ends of the interaction coordination module are respectively connected with the first WIFI module and the second WIFI module, and are used for realizing real-time communication interaction and working state coordination between the first WIFI module and the second WIFI module so as to meet the vehicle-mounted data transmission requirement of the ASIL-D security level.
2. The ASIL-D class of onboard data transmission system of claim 1, wherein the first WIFI module and the second WIFI module both support an 802.11ax protocol.
3. The ASIL-D class of onboard data transmission system of claim 1, wherein each of said RF circuit modules includes a diplexer, a radio frequency switch and an impedance matching element, and is connected to an external 2.4g+5g dual frequency antenna.
4. The ASIL-D class of onboard data transmission system of claim 3, wherein the impedance matching elements in the RF circuit module include an inductance and a capacitance, the inductance and capacitance cooperating to respectively impedance match signal transmission paths between the diplexer and the radio frequency switch, and between the radio frequency switch and a corresponding WIFI module.
5. The ASIL-D class of onboard data transmission system according to claim 1, wherein the main control unit sends a control command to the first WIFI module through the first interface, controls the first WIFI module to receive data of an external WIFI device and transmit the data to the main control unit, or controls the first WIFI module to send the data of the main control unit to the external WIFI device; The main control unit sends a control instruction to the second WIFI module through the second interface, controls the second WIFI module to receive data of external WIFI equipment and transmit the data to the main control unit, or controls the second WIFI module to send the data of the main control unit to the external WIFI equipment.
6. The ASIL-D level vehicle-mounted data transmission system of claim 1 or 5, wherein the first interface is a high-speed serial computer expansion bus standard PCIE interface and the second interface is a secure digital input-output SDIO interface.
7. The ASIL-D level vehicle-mounted data transmission system of claim 1, wherein the interaction coordination module is specifically configured to: when the vehicle-mounted data transmission quantity is smaller than a preset threshold value, the first WIFI module is controlled to be in a working state, and the second WIFI module is controlled to be in a closing or sleeping state; When the vehicle-mounted data transmission quantity is larger than or equal to a preset threshold value, the first WIFI module and the second WIFI module are controlled to be in a working state at the same time; When the first WIFI module is abnormal or damaged in transmission, the second WIFI module is triggered to switch from a closed or sleep state to a working state, and the first WIFI module is replaced to realize data transmission.
8. An ASIL-D class vehicle-mounted data transmission method, applied to the ASIL-D class vehicle-mounted data transmission system according to any one of claims 1 to 7, comprising: when the vehicle-mounted data transmission quantity is smaller than a preset threshold value, the first WIFI module is controlled to be in a working state, and the second WIFI module is controlled to be in a closing or sleeping state; When the vehicle-mounted data transmission quantity is larger than or equal to a preset threshold value, the first WIFI module and the second WIFI module are controlled to be in a working state at the same time; When the first WIFI module is abnormal or damaged in transmission, the second WIFI module is triggered to switch from a closed or sleep state to a working state, and the first WIFI module is replaced to realize data transmission.

Description

ASIL-D level vehicle-mounted data transmission method and system Technical Field The application relates to the technical field of automobile electronics, in particular to an ASIL-D-level vehicle-mounted data transmission method and system. Background Along with the deep evolution of the automobile electronic technology to intellectualization and networking, the safety, stability and high efficiency of the vehicle-mounted data transmission become core factors for determining the user experience and driving safety, and particularly in high-end vehicle types, critical application scenes such as audio entertainment, high-definition looking-around images, vehicle-road coordination and the like have strict requirements on the safety level of the data transmission. The ASIL-D grade is used as the highest security grade in the ISO26262 functional security standard, and needs to meet the requirements of single-point fault tolerance, hardware redundancy, real-time fault response and the like, so that the ASIL-D grade becomes a core technical index of vehicle-mounted key data transmission. Currently, the vehicle-mounted field meets the data transmission requirement of the ASIL-D security level, is mostly realized by depending on Wireless Local Area Network (WLAN) technology, and is mainly selected by using 802.11ax protocol (i.e. Wi-Fi 6). The protocol can adapt to the requirements of scenes such as vehicle-mounted high-definition video, multi-node data interaction and the like by means of higher transmission rate, lower time delay and stronger multi-equipment concurrency. However, in the prior art, the implementation scheme of ASIL-D grade transmission of 802.11ax protocol has significant limitation that most schemes in the market adopt a single WLAN IC (integrated circuit) as a core transmission unit, and the receiving, processing and transmitting of wireless signals and the data interaction with a vehicle-mounted main control (such as a vehicle machine) are completed through a single chip. However, when a single WLAN IC experiences a drop in transmission efficiency (e.g., an increase in packet loss rate, a drop in rate) due to electromagnetic interference, temperature fluctuations, or hardware aging, or directly suffers from damage, it will cause the vehicle data transmission link to be completely broken. For example, the interruption of high-definition video transmission may affect the driving assistance function, the interruption of audio data transmission directly destroys the entertainment experience of the user, and the user needs to restart the IC or the whole vehicle to restart the vehicle, so that the core requirement of ASIL-D level on fault tolerance is seriously violated, and the upgrading requirement of the current vehicle-mounted electronic field on higher safety, better stability and higher efficiency of key data transmission cannot be met. Disclosure of Invention The application aims to provide an ASIL-D-level vehicle-mounted data transmission method and system, which can obviously improve the stability and the high efficiency of vehicle-mounted data transmission. The first aspect of the present application provides an ASIL-D class vehicle-mounted data transmission system, comprising: The system comprises a main control unit, a double WIFI module, a double RF circuit module, an interface module and an interaction coordination module; The dual WIFI module comprises a first WIFI module and a second WIFI module which are mutually independent and can work cooperatively, and is used for establishing wireless connection with external WIFI equipment and realizing data transmission; The dual-RF circuit module is connected with the dual-WIFI module in a one-to-one correspondence manner and is used for receiving and transmitting the wireless signals of the first WIFI module and the second WIFI module; The interface module comprises a first interface and a second interface, one end of the first interface is connected with the first WIFI module, and the other end of the first interface is connected with the main control unit and is used for controlling the first WIFI module and realizing data communication between the first WIFI module and the main control unit; One end of the second interface is connected with the second WIFI module, and the other end of the second interface is connected with the main control unit and is used for controlling the second WIFI module by the main control unit and realizing data communication between the second WIFI module and the main control unit; And two ends of the interaction coordination module are respectively connected with the first WIFI module and the second WIFI module, and are used for realizing real-time communication interaction and working state coordination between the first WIFI module and the second WIFI module so as to meet the vehicle-mounted data transmission requirement of the ASIL-D security level. In one possible implementation, the first WIFI module and the