Circuit for realizing high-reliability connection of vehicle-mounted Ethernet

Abstract

The utility model provides a circuit for realizing the high-reliability connection of a vehicle-mounted Ethernet, which comprises a vehicle-mounted Ethernet link protector, the vehicle-mounted Ethernet link protector comprises a vehicle-mounted Ethernet interface 1-1, a vehicle-mounted Ethernet interface 2-1, a switching controller 1, a switching controller 2, an instruction processor, a signal detector, a vehicle-mounted Ethernet interface 1-2 and a vehicle-mounted Ethernet interface 2-2. When the vehicle-mounted Ethernet link protector is passive, the Ethernet bus of the original vehicle in the vehicle can be kept to be communicated; a user can recover the reliable communication of the original vehicle without inserting and pulling out any line; after the vehicle-mounted Ethernet bus is accessed, the capability of keeping zero packet loss of original vehicle communication is realized; the device is a vehicle-mounted Ethernet connection device with high reliable fault switching capability, and real-time detection and switching of Ethernet link faults can be realized through internal and external fault detection means. A reliable communication connection mode is provided for a vehicle-mounted Ethernet test, wiring can be facilitated, and testers can switch links according to needs conveniently.

Description

Technical Field

[0001] The utility model belongs to the technical field of vehicle-mounted Ethernet, and in particular relates to a circuit for realizing high-reliability connection of vehicle-mounted Ethernet. Background Art

[0002] With the rise of new technologies such as Internet of Vehicles, in-vehicle entertainment systems and autonomous driving, the bandwidth demand for in-vehicle communication buses is increasing. Ethernet network technology and TCP / IP communication protocols based on mature communication technologies in the industry have been widely used in new automotive architectures.

[0003] Automotive Ethernet is a new LAN technology that uses Ethernet to connect electronic units in the car. Unlike traditional Ethernet that uses four pairs of unshielded twisted-pair cables, automotive Ethernet can achieve transmission rates of 100Mbit / s, 1Gbit / s, and 2.5Gbit / s, 5Gbit / s, and 10Gbit / s (which are under development) on a single twisted-pair cable. At the same time, it also meets the automotive industry's requirements for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency, and synchronous real-time performance.

[0004] During vehicle model testing, a vehicle bus data recorder is required to record the vehicle bus data. For recording of vehicle Ethernet, the Ethernet link needs to be disconnected and a Y-type link is formed through the two vehicle Ethernet ports of the vehicle bus data recorder to ensure that the original vehicle communication is not affected while recording the Ethernet data frame.

[0005] Figure 1 The following is a schematic diagram of the existing original vehicle in-vehicle Ethernet communication link structure. When the original vehicle in-vehicle Ethernet communication is connected, the two controllers of the original vehicle: controller 1 and controller 2 are directly connected through the in-vehicle Ethernet signal. Figure 1 When the vehicle Ethernet signal is transmitted, the physical layer (PHY) chip of the vehicle Ethernet provides a pair of differential signals P and N to the outside, and connects with the opposite end through a twisted pair cable to realize the signal transmission between the vehicle Ethernet port Port_1_1 of the controller 1 and the vehicle Ethernet port Port_2_1 of the controller 2.

[0006] Figure 2 The following is a schematic diagram of the existing vehicle Ethernet communication link structure for accessing a data recorder. Figure 2 It is known that in Figure 1 To add a data recorder to the original vehicle's on-board Ethernet communication link, it is necessary to disconnect the original vehicle's on-board Ethernet communication, connect the data recorder's two on-board Ethernet ports Port_3_1 and Port_2_2 to the original vehicle's on-board Ethernet ports of controller 1 and controller 2 respectively, and use the data recorder to shunt and copy data to ensure that the original vehicle's communication is unimpeded. Figure 2 It can be seen that if the data recorder fails to send, it will cause the original vehicle's on-board Ethernet communication link to fail, causing communication abnormalities or even interruption of the on-board Ethernet data link.

[0007] With the popularization of in-vehicle Ethernet, its importance is increasing. If the transmission link communication is interrupted, it will cause vehicle control failure and delay, which will not only affect the use function, but more importantly, affect the processing response of instructions such as vehicle control and automatic driving. Therefore, it is particularly important to protect the in-vehicle Ethernet communication link and enhance its reliability.

[0008] Due to the point-to-point connection characteristics of in-vehicle Ethernet, the integration of data loggers in the car faces tedious wiring harness modification work. Not only that, when conducting tests involving in-vehicle Ethernet, the risk of Ethernet connection failure caused by transmission link failure may also affect the function of the entire vehicle. The existing technology ensures the communication connectivity of the in-vehicle Ethernet link through the work of the data logger, but if the data logger encounters accidents such as accidental power failure or accidental failure, the in-vehicle Ethernet link will be interrupted. Utility Model Content

[0009] In view of the above problems, the utility model proposes a circuit for realizing high-reliability connection of vehicle-mounted Ethernet.

[0010] The utility model provides a circuit for realizing high reliability connection of vehicle-mounted Ethernet, comprising: a vehicle-mounted Ethernet link protector,

[0011] The vehicle Ethernet link protector includes: a first vehicle Ethernet interface 1-1, a second vehicle Ethernet interface 2-1, a first switching controller 1, a second switching controller 2, a command processor, a signal detector, a third vehicle Ethernet interface 1-2, and a fourth vehicle Ethernet interface 2-2.

[0012] The first vehicle Ethernet interface 1-1 and the second vehicle Ethernet interface 2-1 are used to connect to the vehicle Ethernet port of the original vehicle;

[0013] The third vehicle Ethernet interface 1-2 and the fourth vehicle Ethernet interface 2-2 are used to connect to the vehicle Ethernet ports of external devices;

[0014] The first switching controller 1 is used to switch the first signal of the first vehicle Ethernet interface 1-1 to the second signal of the second vehicle Ethernet interface 2-1 or the third signal of the third vehicle Ethernet interface 1-2;

[0015] The second switching controller 2 is used to switch the fourth signal of the second vehicle Ethernet interface 2-1 to the fifth signal of the first vehicle Ethernet interface 1-1 or the sixth signal of the fourth vehicle Ethernet interface 2-2;

[0016] The first vehicle Ethernet interface 1-1 is connected to the first switching controller 1 via signal lines A1_P and A1_N, the second vehicle Ethernet interface 2-1 is connected to the second switching controller 2 via signal lines A2_P and A2_N, the third vehicle Ethernet interface 1-2 is connected to the first switching controller 1 via signal lines B1_P and B1_N, and the fourth vehicle Ethernet interface 2-2 is connected to the second switching controller 2 via signal lines B2_P and B2_N;

[0017] The first switching controller 1 is provided with ports C1_P and C1_N, the second switching controller 2 is provided with ports C2_P and C2_N, the port C1_P is connected to the port C2_P, and the port C1_N is connected to the port C2_N;

[0018] The signal detector is connected to the signal lines B1_P, B1_N, B2_P, and B2_N, and is also connected to the command processor. The signal detector is used for vehicle Ethernet signal fault detection in the vehicle Ethernet link protector. When it is detected that the signal characteristics are inconsistent with the normal communication signal, the fault protection is triggered, and an internal control instruction is issued to notify the command processor to perform a switching operation, so as to switch the vehicle Ethernet link to the default connection state - the passive state;

[0019] The command processor is connected to the first switching controller 1 and the second switching controller 2, and is used to receive the internal control instructions and the external control instructions to control the first switching controller 1 and the second switching controller 2 to perform link switching of the vehicle Ethernet.

[0020] further,

[0021] The external device is a testing device.

[0022] further,

[0023] The test equipment is a data recorder or a signal simulator.

[0024] further,

[0025] The vehicle Ethernet link protector is used to be connected in series between the vehicle Ethernet port of the first controller of the original vehicle and the vehicle Ethernet port of the test equipment, and is also used to be connected in series between the vehicle Ethernet port of the second controller of the original vehicle and another vehicle Ethernet port of the test equipment.

[0026] further,

[0027] When there is no external power supply, the first switching controller 1 and the second switching controller 2 are used to keep the link of the vehicle Ethernet connected, so as to achieve the connection of the original vehicle Ethernet link when the power is off;

[0028] When powered on and controlled, the first switching controller 1 and the second switching controller 2 are used to achieve the connection between the vehicle Ethernet and the test equipment serially connected in the link.

[0029] The utility model realizes the circuit of high-reliability connection of vehicle-mounted Ethernet. By deploying a vehicle-mounted Ethernet link protector, it can solve the problem of Ethernet link failure caused by single-point failure of test instruments involving vehicle-mounted Ethernet. When the utility model is passive (power off), it can keep the Ethernet bus of the original vehicle in the vehicle connected, and the user can restore the reliable communication of the original vehicle without plugging or unplugging any lines; after connecting to the vehicle-mounted Ethernet bus, it has the ability to maintain zero packet loss in the original vehicle communication, so that the test equipment has "zero" impact on the vehicle-mounted Ethernet bus communication; it is a vehicle-mounted Ethernet connection device with high-reliability fault switching capability, and can realize real-time detection and switching of Ethernet link faults through internal and external fault detection means. It provides a reliable communication connection method for vehicle-mounted Ethernet testing, and can also facilitate wiring, and facilitate test personnel to switch links on demand.

[0030] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of the original vehicle-mounted Ethernet communication link according to the prior art is shown;

[0033] Figure 2 A schematic diagram of the structure of an on-board Ethernet communication link for accessing a data recorder according to the prior art is shown;

[0034] Figure 3 A schematic diagram of a circuit structure for realizing high-reliability connection of vehicle-mounted Ethernet according to an embodiment of the utility model is shown;

[0035] Figure 4 A structural schematic diagram of an in-vehicle Ethernet link protector in a circuit for realizing a high-reliability connection of in-vehicle Ethernet according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", "third", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, not to describe a specific order or a primary and secondary relationship. "Multiple" appearing in this application refers to more than two (including two).

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] Figure 3 The circuit structure of the utility model for realizing high reliability connection of vehicle Ethernet is shown. Figure 3 It can be seen that the circuit structure for realizing high-reliability connection of vehicle Ethernet provided by the utility model is that a vehicle Ethernet link protector is connected in series between the vehicle Ethernet port Port_1_1 of the original vehicle controller such as controller 1 (i.e., the first controller) and the vehicle Ethernet port Port_3_1 of the test equipment such as a data recorder or a signal simulator, and the vehicle Ethernet link protector is simultaneously connected in series to the vehicle Ethernet port Port_2_1 of controller 2 (i.e., the second controller) (not in Figure 3 The bid is listed in Figure 1) and the vehicle Ethernet port Port_3_2 of the test equipment such as a data recorder or a signal simulator. The vehicle Ethernet link protector is used to actively or passively switch the vehicle Ethernet link when various communication anomalies occur, such as anomalies in the test equipment itself or anomalies in the vehicle Ethernet link protector itself, to maintain the communication connection of the original link, and avoid the risk of vehicle Ethernet link communication failure after the introduction of the test equipment, so that the vehicle Ethernet has high-reliability communication capabilities, ensuring that the vehicle Ethernet link communication between the original vehicle controllers is not interrupted under normal and abnormal conditions, thereby not affecting the original vehicle communication and ensuring the communication reliability of the original vehicle controller. Test equipment such as a data recorder or a signal simulator includes a data processor and at least two groups of vehicle Ethernet physical layer chips connected to it for communication.

[0040] Figure 4 The structure diagram of the vehicle Ethernet link protector in the circuit for realizing high reliability connection of vehicle Ethernet according to the embodiment of the utility model is shown. Figure 4 The vehicle Ethernet link protector in the utility model includes: a first vehicle Ethernet interface 1-1, a second vehicle Ethernet interface 2-1, a first switching controller 1, a second switching controller 2, a command processor, a signal detector, a third vehicle Ethernet interface 1-2, and a fourth vehicle Ethernet interface 2-2.

[0041] The first vehicle Ethernet interface 1 - 1 and the second vehicle Ethernet interface 2 - 1 are used to connect to the vehicle Ethernet port of the original vehicle.

[0042] The third vehicle Ethernet interface 1 - 2 and the fourth vehicle Ethernet interface 2 - 2 are used to connect to the vehicle Ethernet ports of a data recorder or a signal simulator.

[0043] The first switching controller 1 is used to switch the signal A1 (ie, the first signal) of the first vehicle Ethernet interface 1-1 to the signal C1 (ie, the second signal) of the second vehicle Ethernet interface 2-1 or the signal B1 (ie, the third signal) of the third vehicle Ethernet interface 1-2.

[0044] The second switching controller 2 is used to switch the signal A2 (ie, the fourth signal) of the second vehicle Ethernet interface 2-1 to the signal C2 (ie, the fifth signal) of the first vehicle Ethernet interface 1-1 or the signal B2 (ie, the sixth signal) of the fourth vehicle Ethernet interface 2-2.

[0045] The first switching controller 1 and the second switching controller 2 have the features of power-off self-protection switching and power-on controlled switching.

[0046] When in passive mode by default, that is, when there is no external power supply, the first switching controller 1 and the second switching controller 2 both keep the link of the vehicle Ethernet connected, that is, signals A1 and A2 are connected to signals C1 and C2 respectively, so that the original vehicle's vehicle Ethernet link is connected when the power is off. The link connection state at this time is recorded as a passive state.

[0047] When powered on, the first switching controller 1 and the second switching controller 2 can switch the signals A1 and A2 to the signals C1 and C2 or B1 and B2 respectively as needed, thereby achieving the connection between the vehicle Ethernet and the test equipment connected in series in its link.

[0048] Each vehicle Ethernet interface has two signal lines, P and N, for differential signal transmission of vehicle Ethernet. The first vehicle Ethernet interface 1-1 is connected to the first switching controller 1 through signal lines A1_P and A1_N, the second vehicle Ethernet interface 2-1 is connected to the second switching controller 2 through signal lines A2_P and A2_N, the third vehicle Ethernet interface 1-2 is connected to the first switching controller 1 through signal lines B1_P and B1_N, and the fourth vehicle Ethernet interface 2-2 is connected to the second switching controller 2 through signal lines B2_P and B2_N. The first switching controller 1 is provided with ports C1_P and C1_N, and the second switching controller 2 is provided with ports C2_P and C2_N, port C1_P is connected to port C2_P, and port C1_N is connected to port C2_N.

[0049] The signal detector is connected to the signal lines B1_P, B1_N, B2_P, and B2_N, and is also connected to the command processor. The signal detector is used for vehicle Ethernet signal fault detection in the vehicle Ethernet link protector. When the signal characteristics are detected to be inconsistent with the normal communication signal, the fault protection is triggered, and an internal control command is issued to notify the command processor to perform a switching operation, switching the vehicle Ethernet link to the default connection state - passive state.

[0050] In addition to being connected to the signal detector, the command processor is also connected to the first switching controller 1 and the second switching controller 2. The command processor is used to receive internal control instructions and external control instructions to control the first switching controller 1 and the second switching controller 2 to switch the link of the vehicle Ethernet.

[0051] The operation process of the vehicle-mounted system using the utility model:

[0052] 1. The vehicle is not ignited, the vehicle Ethernet link protector is not powered on, and the power consumption is zero. The vehicle Ethernet link maintains the original vehicle connection. At this time, as long as there is Ethernet communication, the original vehicle controller communication is normal.

[0053] 2. When the vehicle is ignited, the vehicle Ethernet link protector is powered on and determines the link switching state according to the received control command.

[0054] 3. Before the test equipment connected to the vehicle Ethernet works, the original vehicle link is in a passive state, and the work does not affect the original vehicle communication. After the test equipment works normally, the command notifies the vehicle Ethernet link protector to switch the link, and the vehicle Ethernet link protector switches the vehicle Ethernet signal to the test equipment, thereby achieving zero packet loss in the original vehicle controller communication, and the test equipment has zero impact on the original link communication.

[0055] 4. When the driver finds a fault, the test equipment detects a fault, or the vehicle Ethernet link protector detects a signal fault during vehicle operation, the vehicle Ethernet link protector can be triggered to switch the vehicle Ethernet link to a passive state, thereby achieving highly reliable original vehicle Ethernet communication and ensuring driving safety.

[0056] Application scenarios supported by this utility model:

[0057] 1. Vehicle rerouting. The utility model keeps the link connected in a passive state without affecting the original vehicle communication. When the vehicle Ethernet signal needs to be led out, the original connection and line do not need to be changed, and only need to be connected to the output port of the utility model. After the power is turned on, the signal connection state can be switched.

[0058] 2. Equipped with a data recorder, it supports protection switching of the vehicle Ethernet link. When the data recorder works normally, the link is switched to the data recorder; when the data recorder works abnormally, the utility model is triggered automatically or manually to maintain the original vehicle link connection.

[0059] 3. Matching vehicle-mounted Ethernet signal simulation equipment. The utility model supports Ethernet two-way communication, so it is also suitable for the connection of Ethernet signal simulation equipment. Similarly, if the simulation equipment is abnormal, the utility model can also be triggered to maintain the original vehicle link connection.

[0060] 4. Furthermore, the utility model can be used not only for active reliability protection and passive reliability protection of vehicle-mounted Ethernet, but also for protection of other buses with differential signal transmission characteristics, such as CAN bus and FlexRay bus.

[0061] The passive reliability protection refers to: when the vehicle Ethernet link protector is abnormally powered off, such as:

[0062] The power supply of the vehicle Ethernet link protector itself is abnormal.

[0063] External power supply abnormality,

[0064] When the power supply of the vehicle Ethernet link protector is cut off by the external detection system,

[0065] The vehicle Ethernet link protector can realize the original vehicle controller under passive conditions. Figure 3 The vehicle Ethernet of controller 1 and controller 2 in the system can communicate normally and continuously without affecting the original vehicle communication, thus achieving a highly reliable connection for vehicle Ethernet communication.

[0066] This feature can also be conveniently used for rerouting the vehicle-mounted Ethernet bus. The original vehicle-mounted Ethernet bus is connected to the vehicle-mounted Ethernet link protector. When the protector is powered on and the switching conditions are met, the vehicle-mounted Ethernet signal can be automatically switched to external output for docking test instruments; if the power is turned off, it will automatically switch back to the original vehicle link, without the need to plug in or unplug the bus port to change the link connection.

[0067] The active reliability protection means that when the vehicle Ethernet link protector is operating normally, the vehicle Ethernet link can be switched by receiving external control instructions or internal active detection. Before the vehicle Ethernet port of the external test equipment is operating normally, the vehicle Ethernet link protector does not receive the control of the external test equipment, does not switch the link, and keeps the original vehicle link working. When the external test equipment is working, it sends a control instruction to notify the vehicle Ethernet link protection device to switch to the mode of cutting off the original vehicle link.

[0068] Active reliability protection achieves a key capability: zero packet loss in the vehicle Ethernet communication bus. This is because the original vehicle link works before the test equipment connected to the vehicle Ethernet works. Only after the test equipment works normally and notifies the vehicle Ethernet link protector to switch the link, the vehicle Ethernet signal will be switched to the test equipment, thus achieving zero packet loss in the original vehicle controller communication, and the test equipment has zero impact on the original vehicle link communication.

[0069] In summary, the utility model can keep the original vehicle's Ethernet bus connected in the vehicle when it is passive (power off), and the user can restore the original vehicle's reliable communication without plugging or unplugging any lines; after connecting to the vehicle's Ethernet bus, it has the ability to maintain zero packet loss in the original vehicle's communication, so that the test equipment has "zero" impact on the vehicle's Ethernet bus communication; it is a vehicle-mounted Ethernet connection device with high-reliability fault switching capability, and can realize real-time detection and switching of Ethernet link faults through internal and external fault detection means.

[0070] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A circuit for realizing high reliability connection of vehicle Ethernet, characterized in that: include: Automotive Ethernet link protector, The vehicle-mounted Ethernet link protector comprises: a first vehicle-mounted Ethernet interface (1-1), a second vehicle-mounted Ethernet interface (2-1), a first switching controller (1), a second switching controller (2), a command processor, a signal detector, a third vehicle-mounted Ethernet interface (1-2), and a fourth vehicle-mounted Ethernet interface (2-2). The first vehicle-mounted Ethernet interface (1-1) and the second vehicle-mounted Ethernet interface (2-1) are used to connect to the vehicle-mounted Ethernet port of the original vehicle; The third vehicle-mounted Ethernet interface (1-2) and the fourth vehicle-mounted Ethernet interface (2-2) are used to connect to the vehicle-mounted Ethernet ports of external devices; The first switching controller (1) is used to switch the first signal of the first vehicle Ethernet interface (1-1) to the second signal of the second vehicle Ethernet interface (2-1) or the third signal of the third vehicle Ethernet interface (1-2); The second switching controller (2) is used to switch the fourth signal of the second vehicle Ethernet interface (2-1) to the fifth signal of the first vehicle Ethernet interface (1-1) or the sixth signal of the fourth vehicle Ethernet interface (2-2); The first vehicle Ethernet interface (1-1) and the first switching controller (1) are connected via a first signal line (A1_P) and a second signal line (A1_N), the second vehicle Ethernet interface (2-1) and the second switching controller (2) are connected via a third signal line (A2_P) and a fourth signal line (A2_N), the third vehicle Ethernet interface (1-2) and the first switching controller (1) are connected via a fifth signal line (B1_P) and a sixth signal line (B1_N), and the fourth vehicle Ethernet interface (2-2) and the second switching controller (2) are connected via a seventh signal line (B2_P) and an eighth signal line (B2_N); The first switching controller (1) is provided with a first port (C1_P) and a second port (C1_N), the second switching controller (2) is provided with a third port (C2_P) and a fourth port (C2_N), the first port (C1_P) and the third port (C2_P) are connected, and the second port (C1_N) and the fourth port (C2_N) are connected; The signal detector is connected to the fifth signal line (B1_P), the sixth signal line (B1_N), the seventh signal line (B2_P), and the eighth signal line (B2_N), and is also connected to the command processor. The signal detector is used for vehicle Ethernet signal fault detection in the vehicle Ethernet link protector. When it is detected that the signal characteristics are inconsistent with the normal communication signal, the fault protection is triggered, and an internal control instruction is issued to notify the command processor to perform a switching operation, so as to switch the vehicle Ethernet link to the default connection state-the passive state; The command processor is connected to the first switching controller (1) and the second switching controller (2), and is used to receive the internal control instructions and the external control instructions to control the first switching controller (1) and the second switching controller (2) to perform link switching of the vehicle Ethernet.

2. The circuit for realizing high reliability connection of vehicle-mounted Ethernet according to claim 1, characterized in that: The external device is a testing device.

3. The circuit for realizing high reliability connection of vehicle-mounted Ethernet according to claim 2, characterized in that: The test equipment is a data recorder or a signal simulator.

4. The circuit for realizing high reliability connection of vehicle-mounted Ethernet according to any one of claims 2-3, characterized in that: The vehicle Ethernet link protector is used to be connected in series between the vehicle Ethernet port of the first controller of the original vehicle and the vehicle Ethernet port of the test equipment, and is also used to be connected in series between the vehicle Ethernet port of the second controller of the original vehicle and another vehicle Ethernet port of the test equipment.

5. The circuit for realizing high reliability connection of vehicle-mounted Ethernet according to claim 4, characterized in that: When there is no external power supply, the first switching controller (1) and the second switching controller (2) are used to keep the link of the vehicle Ethernet connected, so as to achieve the connection of the original vehicle Ethernet link when the power is off; When powered on under control, the first switching controller (1) and the second switching controller (2) are used to achieve docking between the vehicle-mounted Ethernet and the test equipment serially connected in its link.

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