CN113364656A - Vehicle-mounted network central domain controller - Google Patents
Vehicle-mounted network central domain controller Download PDFInfo
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- CN113364656A CN113364656A CN202110486063.2A CN202110486063A CN113364656A CN 113364656 A CN113364656 A CN 113364656A CN 202110486063 A CN202110486063 A CN 202110486063A CN 113364656 A CN113364656 A CN 113364656A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40234—Local Interconnect Network LIN
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a vehicle-mounted networking central domain controller which comprises a system power supply, and an MCU (microprogrammed control Unit) real-time processing unit, an MPU (micro processing Unit) processing unit, an in-vehicle wireless communication unit, a 4G communication unit, an LTE-V (Long term evolution-V) communication unit, a positioning unit, an in-vehicle network transceiving unit, an RGMII (network target information infrastructure) routing unit and a hardware safety unit which are electrically connected with the system power supply. The vehicle-mounted networking central domain controller integrates the central gateway domain controller framework of the vehicle internal network and the vehicle external network, has higher integration level and expandability, and has obvious cost advantage by replacing the original separation framework scheme due to the factors of reducing the number of chips, reusing the chip resources, saving high-speed interconnection wire harnesses and the like.
Description
Technical Field
The invention belongs to the technical field of vehicle-mounted communication, and particularly relates to a vehicle-mounted networking central domain controller.
Background
The intelligent internet automobile, as a development trend and direction of the future automobile industry, has received high attention from the nation in recent years, and in the route map of the intelligent internet automobile in China, the technologies of automatic driving, lane cooperation and intelligent movable cabin mobile interconnection are clearly defined as key development directions. In order to realize the technical application, the large-scale data volume of the sensors required by automatic driving, the ultra-low delay multipoint concurrent processing requirement of the vehicle and the road in cooperation with V2X and the diverse ecological application experience of vehicle mobile interconnection provide higher requirements for high-speed communication and information route exchange in the vehicle. The traditional gateway only has a low-speed CAN in an automobile intranet, an LIN bus, low transmission rate, a single interface, and external interconnection communication, and mainly depends on a T-BOX module, most of the existing V2X OBU products are after-loading products, the reliability and the safety do not meet the requirements of automobile specification products, and the existing separated controller architecture of 'gateway + T-BOX + OBU' is not really integrated into the internal network architecture, and the existing separated controller architecture of 'gateway + T-BOX + OBU' is connected with the traditional network cable through the CAN/LIN bus, the communication efficiency of multiple physical layer conversion data is low, the high-efficiency forwarding requirement of the internal and external networks of the automobile CAN not be realized, and the future intelligent networking function CAN not be applied to the ground.
Disclosure of Invention
In view of the above, the invention aims to provide a vehicle-mounted networking central domain controller, so as to meet the requirement of network communication forwarding routing in a future intelligent networking vehicle, complete high integration of a vehicle-mounted LIN bus, a CANFD bus, a 100base-T1 high-speed vehicle-mounted ethernet bus, an LTE 4G communication baseband and an LTE-V V2X communication baseband, and use a differential bus to fuse a communication framework, complete a high-efficiency and high-reliability domain controller product scheme design, accelerate the landing of the intelligent networking vehicle internal and external network high-speed communication interconnection technology, and promote the development of the vehicle networking technology.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle-mounted network central domain controller comprises a system power supply, an MCU real-time processing unit, an MPU processing unit, an in-vehicle wireless communication unit, a 4G communication unit, an LTE-V communication unit, a positioning unit, an in-vehicle network transceiving unit, an RGMII routing unit and a hardware safety unit which are electrically connected with the system power supply, wherein the LTE-V communication unit is connected with the positioning unit through a circuit, the input end of the LTE-V communication unit receives a wireless signal, the output end of the LTE-V communication unit sends the signal to the MPU processing unit, the MPU real-time processing unit transmits the signal to the MCU real-time processing unit after calculation processing by a decision algorithm formula, the MCU real-time processing unit and the MPU processing unit are connected through an SPI bus unit, and the MCU real-time processing unit and the MPU processing unit are respectively connected with the RGMII routing unit to realize data two-way communication between the MCU unit and the MPU unit to form a differential bus fusion communication framework, one side of the MCU real-time processing unit is connected with the hardware safety unit through a circuit, the MCU real-time processing unit converts signals after calculation processing and is simultaneously connected with the vehicle intranet receiving and transmitting unit and the 4G communication unit through a circuit, and the 4G communication unit is connected with the vehicle intranet receiving and transmitting unit through a circuit.
Further, the decision algorithm formula is as follows:
wherein V is the recommended driving speed, V0As the current vehicle speed, a1For coasting deceleration, t2At the end of the green light window, t0Is the current time, D0The distance between the tail of the current vehicle and the intersection.
Furthermore, the MCU real-time processing unit comprises an MCU microcontroller chip, a first crystal oscillator circuit, a first reset circuit and a first decoupling circuit which are all connected with the MCU microcontroller chip through circuits, the MCU microcontroller chip is respectively connected with the MPU processing unit, the 4G communication unit, the RGMII routing unit, the vehicle internal network transceiving unit and the hardware safety unit through circuits, the first crystal oscillator circuit comprises a first quartz crystal, a first ceramic capacitor and a first resistor, the first crystal oscillator circuit provides reference clock reference for the work of the MCU microcontroller chip, the circuit has the advantages that the vibration is started through the internal oscillating circuit of the MCU microcontroller chip, the first reset circuit comprises a first key, a first capacitor and a first pull-up resistor, the first reset circuit is an internal functional module of the MCU microcontroller chip and is used for uniformly electrifying a time sequence, the first decoupling circuit comprises a multi-stage capacitor, and the first decoupling circuit is used for filtering the interference on a circuit line of the MCU microcontroller chip.
Further, the MPU processing unit comprises a high power SOC, a DDR memory chip, an EMMC memory chip, a second crystal oscillator circuit, a second reset circuit and a second decoupling circuit which are all connected with the high power SOC through circuits, the high power SOC is respectively connected with the MCU chip, the LTE-V communication unit and the RGMII routing unit through circuits, the second crystal oscillator circuit provides reference clock reference for the high power SOC, the high-power SOC shock absorption and recovery integrated circuit has the advantages that the internal oscillation circuit of the high-power SOC shakes, the second reset circuit is an internal function module of the high-power SOC, the power-on time sequence is unified, the second decoupling circuit filters interference on a circuit line for the high-power SOC, the DDDR memory chip is used for providing a program operation processing cache space, a high-speed read-write data bus and a reliable data storage space are provided, and the EMMC memory chip is used for providing a power-down nonvolatile storage space for the SOC and storing application programs and high-precision map data.
Furthermore, the 4G communication unit comprises a 4G baseband module, a sim card, a crystal oscillator circuit, a reset circuit and a decoupling circuit, wherein the sim card, the crystal oscillator circuit, the reset circuit and the decoupling circuit are all connected with the 4G baseband module through a main antenna and an auxiliary antenna, the sim card is internally communicated with the MCU real-time processing unit through a USB bus, the crystal oscillator circuit provides a reference clock reference for the work of the 4G baseband module, the oscillation circuit starts to oscillate through the internal oscillation circuit of the 4G baseband module, the reset circuit is a functional module inside the 4G baseband module, the power-on time sequence is unified, and the decoupling circuit is used for filtering interference on a circuit line of the 4G baseband module.
Further, the LTE-V communication unit comprises a baseband processor, and a power management circuit, a fourth crystal oscillator circuit and a fourth reset circuit which are all connected with the baseband processor through circuits; the baseband processor is communicated with the roadbed equipment through the antenna circuit, a serial port on one side of the baseband processor is connected to the positioning unit, the fourth crystal oscillator circuit provides reference clock reference for the work of the baseband processor, the oscillation circuit in the baseband processor starts oscillation, and the fourth reset circuit is an internal functional module of the baseband processor.
Furthermore, the RGMII routing unit comprises an Ethernet switch, a fifth crystal oscillator circuit, a fifth reset circuit, a filter circuit, a power-on configuration circuit and a vehicle-mounted Ethernet transceiver, wherein the fifth crystal oscillator circuit, the fifth reset circuit, the filter circuit, the power-on configuration circuit and the vehicle-mounted Ethernet transceiver are all connected with the Ethernet switch through circuits, the fifth crystal oscillator circuit provides reference clock reference for the work of the Ethernet switch, the oscillation circuit in the baseband processor starts oscillation, and the fifth reset circuit is an internal function module of the Ethernet switch and unifies power-on time sequence.
Further, SPI bus unit includes MCU, SOC both ends SPI receiving and dispatching unit, and it links to each other through the SPI bus, and signal conditioning resistance establishes ties on the SPI bus to place at the transmitting terminal, in addition, through the IO interruption unit of hardwire connection MCU and SOC, realize high real-time hardware interruption.
Furthermore, the car intranet transceiver unit includes CAN LIN bus transceiver all rather than line connection's No. six crystal oscillator circuit, No. six reset circuit and No. six decoupling circuit, CAN LIN bus transceiver one side and MCU microcontroller chip line connection, opposite side and car intranet wireless communication unit line connection, No. six crystal oscillator circuit provides the benchmark clock reference for CAN LIN bus transceiver work, shake through the inside oscillator circuit of CAN LIN bus transceiver, No. six reset circuit is the inside function module of CAN LIN bus transceiver, No. six decoupling circuit filters the interference on the circuit line for CAN LIN bus transceiver.
Compared with the prior art, the vehicle-mounted networking central domain controller has the following advantages:
(1) the vehicle-mounted networking central domain controller integrates the central gateway domain controller framework of the vehicle internal network and the vehicle external network, has higher integration level and expandability, and has obvious cost advantage by replacing the original separation framework scheme due to the factors of reducing the number of chips, reusing the chip resources, saving high-speed interconnection wire harnesses and the like.
(2) The vehicle-mounted networking central domain controller has a differential speed bus fusion communication framework, so that C-V2X messages are directly forwarded by routing with a vehicle intranet CAN bus and a vehicle-mounted Ethernet bus, an on-board RGMII bus is used for replacing the Ethernet bus, the signal conversion delay of multiple physical layers is eliminated, a low-speed high-real-time SPI bus and a hardware interrupt signal are combined to transmit high-real-time messages, the accurate transmission of key instructions is ensured, a reliable and efficient bottom foundation is provided, and the design application process of the vehicle networking of the whole vehicle factory is accelerated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is an overall flowchart of a vehicle-mounted networking central domain controller according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of an MCU real-time processing unit of a vehicle-mounted networking central domain controller according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a crystal oscillator circuit of a vehicle-mounted networking central domain controller MCU real-time processing unit i according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a first reset circuit of a real-time processing unit of a vehicle-mounted networking central domain controller MCU according to an embodiment of the present invention;
fig. 5 is a circuit diagram of a decoupling circuit of a first real-time processing unit of an MCU of a vehicle-mounted networking central domain controller according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of an MPU processing unit of a vehicle-mounted networking central domain controller according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a 4G communication unit of a vehicle-mounted networking central domain controller according to an embodiment of the present invention;
fig. 8 is a schematic block diagram of an LTE-V communication unit of a vehicle-mounted network connection central domain controller according to an embodiment of the present invention;
fig. 9 is a schematic block diagram of a vehicle-mounted networking central domain controller RGMII routing unit according to an embodiment of the present invention;
fig. 10 is a schematic block diagram of an in-vehicle network transceiver unit of a vehicle-mounted network connection central domain controller according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The noun explains:
heterogeneous system architecture: HSA is called Heterogeneous System Architecture (heteogenes System Architecture) and translation into Chinese is called Heterogeneous System Architecture (heteogenes System Architecture), and emphasis is placed on CPU + GPU Heterogeneous computing.
As shown in figure 1, a vehicle-mounted networking central domain controller comprises a system power supply, an MCU real-time processing unit, an MPU processing unit, an in-vehicle wireless communication unit, a 4G communication unit, an LTE-V communication unit, a positioning unit, an in-vehicle network transceiving unit, an RGMII routing unit and a hardware safety unit which are electrically connected with the system power supply, wherein the LTE-V communication unit is connected with the positioning unit through a circuit, the input end of the LTE-V communication unit receives a wireless signal, the output end sends the signal to the MPU processing unit, the MPU real-time processing unit outputs the signal to the MCU real-time processing unit after calculation processing by a decision algorithm formula, the MCU real-time processing unit and the MPU processing unit are both connected with the RGMII routing unit through circuits, one side of the MCU real-time processing unit is connected with the hardware safety unit through a circuit, the MCU real-time processing unit converts the calculated signal and simultaneously converts the signal and transmits the signal to the in-vehicle network transceiving unit, The invention discloses a central gateway networking controller product which integrates a traditional in-vehicle communication network, a high-speed in-vehicle communication network, internet communication and a V2X special network, wherein the central gateway networking controller product reasonably arranges each communication bus to occupy internal processing and bandwidth resources through a multi-core heterogeneous system architecture, and realizes real-time processing and forwarding tasks through an auto-sar-like software architecture on software, so that the purpose of high-speed information interaction inside and outside a vehicle is achieved.
The system power supply comprises a system power supply unit and a standby power supply unit, a charging module is further arranged in the standby power supply unit, the system power supply unit is powered by an in-vehicle storage battery and supplies power to the whole system in a normal working state, a nickel-hydrogen battery is arranged in the standby power supply unit for supplying power, the standby power supply is provided under the condition that a main power supply cable is disconnected, the two power supply units are composed of a DCDC power supply and an LDO power supply chip, and corresponding power supply parameters are provided according to the voltage amplitude and current requirements required by each power consumption device; the system power supply unit and the standby power supply unit form the basic power supply of the controller system, the charging module is responsible for converting the level charging of a 12V system of the whole vehicle into voltages such as 5V, 3.3V,3.8V and 2.5V used by an on-board chip, and an internal power supply system is prevented from being damaged by an external complex power supply environment, such as load throwing and alternating current superposition interference. The standby power supply selects a nickel-metal hydride battery, refers to an emergency call standard, maintains the basic functions of the system for half an hour under the condition of unexpected power failure, selects 4 sections of nickel-metal hydride batteries to be connected in series according to the calculation of the power consumption of the whole machine, and applies a charging and battery management circuit and a standby power supply switching circuit.
The decision algorithm formula is as follows:
wherein V is the recommended driving speed, V0As the current vehicle speed, a1For coasting deceleration, t2At the end of the green light window, t0Is the current time, D0The distance between the tail of the current vehicle and the intersection.
As shown in fig. 2 to 5, the MCU real-time processing unit includes an MCU microcontroller chip, a first crystal oscillator circuit, a first reset circuit and a first decoupling circuit, the MCU microcontroller chip is respectively connected to the MPU processing unit, the 4G communication unit, the RGMII routing unit, the in-vehicle network transceiver unit and the hardware security unit, the first crystal oscillator circuit includes a first quartz crystal, a first ceramic capacitor and a first resistor, the first crystal oscillator circuit provides a reference clock reference for the MCU microcontroller chip to work, the first reset circuit includes a first key, a first capacitor and a first pull-up resistor, the first reset circuit is an internal functional module of the MCU microcontroller chip, unifies the power-on sequence, the first decoupling circuit includes a plurality of capacitors, the first decoupling circuit filters the interference on the circuit for the MCU microcontroller chip, as shown in fig. 3, it is a crystal oscillator circuit diagram of the MCU real-time processing unit, where the first, third, fourth, fifth and sixth crystal oscillator circuits are the same, R299 and R1043 represent a resistor, C274 and C273 represent a ceramic capacitor, Y4 represents a quartz crystal, the input terminal of the MCU microcontroller chip is divided into two paths, one path is connected to R1043 and R299 and returns to the output terminal of the MCU microcontroller chip, the other path is divided into two paths and respectively connected to Y4 and C274, the path returns to the output terminal of the MCU microcontroller chip through Y4 and R299, the path returns to the output terminal of the MCU chip through C274 and R299, as shown in fig. 4, it is a reset circuit diagram of the MCU real-time processing unit, U567 is a monitor reset chip, and monitor the system voltage from 0.4V to 5V, and when the SENSE voltage drops below the preset threshold or the Manual Reset (MR) pin drops to the logic low voltage, the open drain RESET signal is asserted. The RESET output will remain low for a user adjustable delay time when the SENSE voltage and the Manual RESET (MR) return value exceed the respective thresholds. SW10 provides the manual reset signal, D523 is the electrostatic protection diode, C1230 prevents that the shake from triggering the reset by mistake, R1211 and R121 divide the voltage for the system voltage, C1234 is the control voltage filter capacitance, guarantee that voltage detection pin input voltage is effective, C1231 is VDD power supply pin filtering power noise, R1210 pull-up resistance provides high level voltage for the open drain reset signal, R1212 is used for walking the line adjustment impedance match for the reset signal, C1232, and C1234 is used for adjusting the time delay of two signals of reset output and input. The first reset circuit, the third reset circuit, the fourth reset circuit, the fifth reset circuit and the sixth reset circuit are the same. As shown in fig. 5, a decoupling circuit diagram of the MCU real-time processing unit is shown, wherein a decoupling capacitor is designed by using an L-line filter circuit architecture, L546 selects a 120ohm characteristic impedance, and other capacitors select two capacitance values of 10uF and 0.1uF according to a notch frequency, and form a second-order filter circuit with L546 to provide a stable low-noise power supply for the MCU circuit, and the first decoupling circuit, the third decoupling circuit, and the sixth decoupling circuit are the same and reduce coupling under the same power supply; the hardware safety unit is composed of independent hardware encryption chips, is different from software algorithm encryption, CAN efficiently and quickly complete information encryption and decryption functions, is not easy to crack, and CAN meet the higher requirements of a central gateway network domain controller on information safety, the MCU real-time processing unit realizes all real-time operation tasks in the system, the hardware is provided with high-speed and low-speed buses such as USB, GPIO, I2C, UART, RGMII, CAN and the like, so that real-time task processing is realized, the power state of the whole machine is controlled, and the internal resources of the MCU use ARM Cortex M4 as reference.
As shown in fig. 6, the MPU processing unit includes a high power SOC, and a DDR memory chip, an EMMC memory chip, a second crystal oscillator circuit, a second reset circuit, and a second decoupling circuit all connected to the high power SOC, the high power SOC is respectively connected to the MCU microcontroller chip, the LTE-V communication unit, and the RGMII routing unit through circuits, the second crystal oscillator circuit provides a reference clock reference for the high power SOC to work, the method comprises the steps that an internal oscillation circuit of the high-calculation-power SOC vibrates, a second reset circuit is an internal function module of the high-calculation-power SOC, a power-on time sequence is unified, a second decoupling circuit filters interference on a circuit line of the high-calculation-power SOC, coupling under the same power supply is reduced, a DDDR memory chip is used for providing a program operation processing cache space, a high-speed read-write data bus and a reliable data storage space are provided, and an EMMC memory chip is used for providing a power-down nonvolatile storage space for the SOC and storing an application program and high-precision map data; the MPU processing unit is matched with the LTE-V communication module to realize application of vehicle-road cooperation, vehicle-vehicle interconnection and the like, a Linux customized SDK development environment is operated on the basis of an MPU kernel, the communication module receives data packets through a USB bus, 17 application scenes required by the V2X specification are realized by analyzing a large amount of concurrent data, an Ethernet bus interface is simultaneously expanded by the MPU, the MPU is communicated with an automatic driving domain controller and a digital cabin domain controller in a vehicle, and richer automatic driving functions and HMI human-machine interaction are realized for the whole vehicle.
As shown in fig. 7, the 4G communication unit includes a 4G baseband module, and an sim card, a third crystal oscillator circuit, a third reset circuit and a third decoupling circuit all connected with the circuit, the 4G baseband module communicates with the base station through a main and auxiliary antenna, the sim card communicates with the MCU real-time processing unit through a USB bus, the third crystal oscillator circuit provides a reference clock reference for the 4G baseband module to work, the 4G baseband module starts oscillation through an internal oscillation circuit, the third reset circuit is a 4G baseband module internal function module, unifies power-on timing, the third decoupling circuit filters interference on the 4G baseband module to reduce coupling under the same power supply, the 4G external wireless communication function module communicates with the base station through the main and auxiliary antenna by a baseband chip, the system board communicates with the MCU real-time control unit through the USB bus, the MCU develops through an AT command in cooperation with the 4G module openCPU, the 4G networking function is realized, the 4G wireless communication function unit is connected with an MCU external interrupt source through a GPIO to realize supporting remote awakening, and the WIFI/BT function is expanded through a serial port and an SDIO.
As shown in fig. 8, the LTE-V communication unit includes a baseband processor, and a power management circuit, a fourth crystal oscillator circuit, and a fourth reset circuit all connected to the baseband processor through a circuit; the baseband processor is communicated with roadbed equipment through an antenna circuit, one side of the baseband processor is connected to a positioning unit through a serial port, a fourth crystal oscillator circuit provides reference clock reference for the work of the baseband processor, the baseband processor vibrates through an internal oscillating circuit, a fourth reset circuit is an internal functional module of the baseband processor, the power-on time sequence is unified, the positioning unit is composed of a high-precision GNSS unit and is used for providing high-precision positioning data for an LTE-V module, the LTE-V communication unit is used for providing LTE-V communication capacity and realizing vehicle-road cooperation and vehicle-vehicle communication, the LTE-V communication unit is communicated with an MPU through a USB bus, and a USB interface is expanded to be connected with an upper computer to realize program upgrading and debugging.
As shown in fig. 9, the RGMII routing unit includes a switch chip, and a crystal oscillator circuit, a reset circuit, a filter circuit, a power-on configuration circuit, and a vehicle-mounted ethernet transceiver, all connected to the switch chip via a line, the crystal oscillator circuit provides a reference clock reference for the ethernet switch to work, the vibration is started through an internal oscillating circuit of the baseband processor, the fifth reset circuit is an internal functional module of the Ethernet switch, the power-on time sequence is unified, the RGMII routing unit comprises 100Base-T1, 1000Base-T1 and 1000Base-Tx bus interfaces, the communication of the domestic high-speed Ethernet bus is realized, the integrated Ethernet basic protocol stack and the routing forwarding function are integrated, the RGMII routing unit is communicated with the communication module outside the vehicle through an Ethernet intermediate signal RGMII/MII/SGMII, high-speed interconnection and intercommunication of information inside and outside the vehicle are achieved, and the integrated Ethernet basic protocol stack and the routing forwarding function are a core basic framework for achieving OTA and high-definition audio and video signal transmission of the whole vehicle.
As shown in fig. 10, the vehicle interior network transceiver unit comprises a sixth crystal oscillator circuit, a sixth reset circuit and a sixth decoupling circuit, wherein the CAN/LIN bus transceiver is connected with the sixth crystal oscillator circuit, the sixth reset circuit and the sixth decoupling circuit, one side of the CAN/LIN bus transceiver is connected with a microcontroller chip through a line, the other side of the CAN/LIN bus transceiver is connected with the vehicle interior network wireless communication unit through a line, the sixth crystal oscillator circuit provides a reference clock reference for the work of the CAN/LIN bus transceiver, the oscillation circuit in the CAN/LIN bus transceiver starts oscillation, the sixth reset circuit is a functional module in the CAN/LIN bus transceiver, the LIN timing sequence is unified on, the sixth decoupling circuit filters out the interference on the circuit line for the CAN/LIN bus transceiver, the coupling under the same power supply is reduced, the vehicle interior wireless communication unit, the WIFI communication module and the bluetooth communication module are formed, the network hotspot function is realized, the CAN/LIN transceiver is used for MCU microcontroller chip CAN/LIN vehicle intranet message routing forwarding and 4G network and low-speed vehicle intranet routing forwarding, and is represented by main stream vehicle communication network bus physical layer chips such as CAN, CANFD, LIN, Flexray and the like, and is combined with an internal control unit of an MCU control unit to realize the functions of data transmission of vehicle network information, routing forwarding and the like, and the vehicle intranet unit needs to meet the low power consumption requirements of vehicle control dormancy awakening and the like, and the protection requirements of short circuit, overcurrent and overvoltage electric appliances.
Example 1
The network central domain controller is a front-mounted part, and is powered on with electrical equipment of a vehicle body when an automobile is started, after the domain controller is powered on, a system power supply unit converts a 12V power supply of a storage battery in the automobile into 5V, 3.3V, 1.8V, 1.5V and other direct-current voltages required by each unit in the system, the whole system is powered on according to a power-on sequence specified by design, and the system enters a normal working mode after the power supply is stable and each functional module is powered on. The vehicle-mounted networking central domain controller can be applied to a vehicle-road cooperation scene, and in V2X17 application scenes, a red light running early warning scene is taken as an example. The vehicle runs on a traffic light system provided with an RSU, the RSU and a network connection central domain controller keep real-time communication in a period of 100Hz, the traffic light system sends the existing traffic light state and self position information to the network connection central domain controller through a PC5 communication protocol, the network connection central domain controller receives wireless signals through an antenna circuit of an LTE-V communication module, converts the RSU information and self positioning information into USB and Ethernet signals and sends the USB and Ethernet signals to an MPU processing unit, the MPU processing unit calculates the information through processing and combines a decision algorithm formula to output a decision control result (specifically, under the condition that the vehicle arrives at an intersection at a constant speed, the decision control result (recommended running speed) is calculated and output through the decision algorithm formula), the decision control result is sent to an MCU real-time control unit through an on-board bus, the MCU real-time control unit converts the received decision control result into a vehicle specific CAN bus message, the vehicle-mounted internet communication module sends the information to a vehicle body network so as to execute corresponding deceleration behaviors, meanwhile, the Ethernet exchange unit sends the information such as vehicle speed, position information and decision state to the 4G communication unit, and the 4G communication unit sends the information to the cloud platform so as to fulfill the aim of monitoring the state of the remote vehicle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A vehicle-mounted networking central domain controller is characterized in that: the system comprises a system power supply, an MCU real-time processing unit, an MPU processing unit, an in-vehicle wireless communication unit, a 4G communication unit, an LTE-V communication unit, a positioning unit, an in-vehicle network transceiving unit, an RGMII routing unit, an SPI bus unit and a hardware safety unit which are electrically connected with the system power supply, wherein the LTE-V communication unit is connected with the positioning unit through a circuit, the input end of the LTE-V communication unit receives a wireless signal, the output end sends the signal to the MPU processing unit, the MPU real-time processing unit transmits the signal to the MCU real-time processing unit after calculation processing by a decision algorithm formula, the MCU real-time processing unit and the MPU processing unit are connected through the SPI bus unit, the MCU real-time processing unit and the MPU processing unit are respectively connected with the RGMII routing unit, data bidirectional communication between the MCU unit and the MPU unit is realized, a differential bus fusion communication framework is formed, one side of the MCU real-time processing unit is connected with the hardware safety unit through a circuit, the MCU real-time processing unit converts the signals after calculation processing and is simultaneously connected with the vehicle intranet receiving and transmitting unit and the 4G communication unit through circuits, and the 4G communication unit is connected with the vehicle intranet receiving and transmitting unit through circuits.
2. The vehicle-mounted networking central domain controller according to claim 1, wherein: the decision algorithm formula is as follows:
wherein V is the recommended driving speed, V0As the current vehicle speed, a1For coasting deceleration, t2At the end of the green light window, t0Is the current time, D0The distance between the tail of the current vehicle and the intersection.
3. The vehicle-mounted networking central domain controller according to claim 1, wherein: the MCU real-time processing unit comprises an MCU microcontroller chip, a first crystal oscillator circuit, a first reset circuit and a first decoupling circuit which are all connected with the MCU microcontroller chip through circuits, the MCU microcontroller chip is respectively connected with the MPU processing unit, the 4G communication unit, the RGMII routing unit, the in-vehicle network transceiving unit and the hardware safety unit through circuits, the first crystal oscillator circuit comprises a first quartz crystal, a first ceramic capacitor and a first resistor, the first crystal oscillator circuit provides reference clock reference for the work of the MCU microcontroller chip, the circuit has the advantages that the vibration is started through the internal oscillating circuit of the MCU microcontroller chip, the first reset circuit comprises a first key, a first capacitor and a first pull-up resistor, the first reset circuit is an internal functional module of the MCU microcontroller chip and is used for uniformly electrifying a time sequence, the first decoupling circuit comprises a multi-stage capacitor, and the first decoupling circuit is used for filtering the interference on a circuit line of the MCU microcontroller chip.
4. The vehicle-mounted networking central domain controller according to claim 1, wherein: the MPU processing unit comprises a high-calculation-power SOC, a DDR memory chip, an EMMC memory chip, a crystal oscillator circuit II, a reset circuit II and a decoupling circuit II, wherein the DDR memory chip, the EMMC memory chip, the crystal oscillator circuit II, the reset circuit II and the decoupling circuit II are all connected with the circuit of the MPU processing unit, the high-calculation-power SOC is respectively connected with an MCU (micro controller unit) chip, an LTE-V (long term evolution-V) communication unit and an RGMII (remote target information) routing unit through circuits, the crystal oscillator circuit II provides a reference clock for the work of the high-calculation-power SOC, the oscillation circuit in the high-calculation-power SOC starts oscillation, the reset circuit II is a functional module in the high-calculation-power SOC, the power-on time sequence is unified, the decoupling circuit II filters interference on the circuit for the high-calculation-power SOC, the DDDR memory chip is used for providing a program operation processing cache space and providing a high-speed read-write data bus and a reliable data storage space, and the EMMC memory chip provides a power-off nonvolatile storage space for the SOC and is used for storing application programs and high-precision map data.
5. The vehicle-mounted networking central domain controller according to claim 1, wherein: the 4G communication unit comprises a 4G baseband module, a sim card, a crystal oscillator circuit, a MCU real-time processing unit and a decoupling circuit, wherein the sim card, the crystal oscillator circuit, the MCU real-time processing unit and the decoupling circuit are all connected with the 4G baseband module through a main antenna and an auxiliary antenna, the 4G baseband module is communicated with a base station through a USB bus, the crystal oscillator circuit provides reference clock reference for the work of the 4G baseband module, the oscillation circuit starts to oscillate in the 4G baseband module, the reset circuit is a functional module in the 4G baseband module, the power-on time sequence is unified, and the decoupling circuit is used for filtering interference on a circuit line of the 4G baseband module.
6. The vehicle-mounted networking central domain controller according to claim 1, wherein: the LTE-V communication unit comprises a baseband processor, and a power management circuit, a fourth crystal oscillator circuit and a fourth reset circuit which are all connected with the baseband processor through circuits; the baseband processor is communicated with the roadbed equipment through the antenna circuit, a serial port on one side of the baseband processor is connected to the positioning unit, the fourth crystal oscillator circuit provides reference clock reference for the work of the baseband processor, the oscillation circuit in the baseband processor starts oscillation, and the fourth reset circuit is an internal functional module of the baseband processor.
7. The vehicle-mounted networking central domain controller according to claim 1, wherein: the RGMII routing unit comprises a fifth crystal oscillator circuit, a fifth reset circuit, a filter circuit, a power-on configuration circuit and a vehicle-mounted Ethernet transceiver, wherein the fifth crystal oscillator circuit, the fifth reset circuit, the filter circuit, the power-on configuration circuit and the vehicle-mounted Ethernet transceiver are all connected with an Ethernet intermediate signal switch chip through lines, the fifth crystal oscillator circuit provides reference clock reference for the work of an Ethernet switch, the oscillation circuit starts oscillation through the inside of a baseband processor, and the fifth reset circuit is an internal function module of the intermediate signal switch chip and unifies power-on time sequences.
8. The vehicle-mounted networking central domain controller according to claim 1, wherein: SPI bus unit includes MCU, SOC both ends SPI receiving and dispatching unit, and it links to each other through the SPI bus, and signal conditioning resistance establishes ties on the SPI bus to place at the transmitting terminal, in addition, through the IO interruption unit of hardwire connection MCU and SOC, realize high real-time hardware interruption.
9. The vehicle-mounted networking central domain controller according to claim 3, wherein: the vehicle intranet receiving and transmitting unit comprises a CAN/LIN bus transceiver, a sixth crystal oscillator circuit, a sixth reset circuit and a sixth decoupling circuit, wherein the CAN/LIN bus transceiver is connected with a circuit of the sixth crystal oscillator circuit, the sixth reset circuit and the sixth decoupling circuit, one side of the CAN/LIN bus transceiver is connected with a MCU (micro controller unit) chip through a circuit, the other side of the CAN/LIN bus transceiver is connected with a vehicle intranet wireless communication unit through a circuit, the sixth crystal oscillator circuit provides reference clock reference for the work of the CAN/LIN bus transceiver, the oscillation circuit starts to oscillate through the inside of the CAN/LIN bus transceiver, the sixth reset circuit is a function module inside the CAN/LIN bus transceiver, and the sixth.
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