CAN FD vehicle-mounted local area network wire harness with LCD screen indication connector

Abstract

A CAN FD vehicle-mounted local area network wire harness with an LCD screen indication connector is mainly applied to local area network control of a new energy electric vehicle with a CAN FD bus, and comprises a CAN FD vehicle-mounted local area network, a CAN FD vehicle-mounted local area network bus plug, a control circuit and an LCD screen indication connector part. According to the CAN FD interface connector, the CAN FD interface connector, the controller and the display are integrated in a space structure through three groups of threaded connection modes on a CAN FD bus plug intermediate body, the structure that the system is most economical and the whole is optimal is achieved, the structure is simple, the cost is low, and the cost is low. The method can be widely applied to CAN FD vehicle-mounted local area network bus equipment of new energy electric vehicles.

Description

Technical Field

[0001] The utility model relates to a CAN FD in-vehicle local area network wire harness with an LCD screen indicating connector, which is mainly applied to the local area network control and display of new energy electric vehicles with a CAN FD bus. Background Art

[0002] An automotive wire harness is a typical non-standard automotive component, yet it is an essential component for achieving automotive lightweight and electronization. With the introduction of artificial intelligence (AI) technology and driverless vehicles, as well as the widespread application of high-definition cameras and radar devices, the demand for high bandwidth and large data volume data lengths is increasing day by day; in addition, the emerging new energy electric vehicles have greatly enhanced the control level of automotive anti-skid stability systems, anti-lock braking systems, and suspension systems. Especially during the instant of these control actions, a large amount of data needs to be exchanged and processed, making the traditional technology become powerless, and even the upgrade of the standard CAN bus has been put on the agenda.

[0003] On the other hand, the manufacturing process of automotive wire harnesses usually has its particularity. Besides partially using wire harness plug-in machines, a large amount of manual labor is also required. The inventor has visited many automotive wire harness manufacturing factories and found an indisputable fact: in the manufacturing process of automotive wire harnesses, in addition to a large amount of manual labor, the CAN in-vehicle local area network bus is always divided into high, medium, and low types, that is, multiple high, medium, and low CAN in-vehicle local area network buses are simultaneously pulled out from the in-vehicle central control box, without branching out from any point on a main wire harness. This wiring arrangement logic means that the standard CAN in-vehicle local area network control bus is merely used as an ordinary wire-controlled wire harness, which will inevitably greatly limit the effective execution of the CAN in-vehicle local area network protocol, is uneconomical in terms of the network, and is a waste.

[0004] In fact, this non-networked by-wire arrangement of the CAN in-vehicle local area network has its own difficulties. First of all, such wiring harnesses only support data packets of 8 bytes, have a fixed transmission baud rate, and low network transmission efficiency. Once the data link goes wrong, the entire data packet has to be discarded. Therefore, the wiring can only be arranged according to the requirements of high, medium, and low baud rate transmissions. Secondly, with the emergence of driverless cars or drones, a large amount of high-definition camera information, 5G location, and radar information need to be transmitted to the monitoring base station in real time. Therefore, the current state of development also forces the original CAN protocol to be improved and extended. For this reason, in 2012, Bosch Company in Germany took the lead in launching an upgraded version of the CAN bus protocol, CAN FD (CAN with Flexible Data-Rate), which is an upgraded version of variable-rate CAN to meet the requirements of in-vehicle local area networks for rapidly developing high bandwidth and large data volume data field lengths. Since the CAN FD bus inherits the advantages of the standard CAN bus, standardizes the compatibility between any two CAN nodes, upgrades the 8-byte data packet to 64 bytes, and extends the standard 11-bit identifier to 29 bits, its ease of use and high reliability have made its application scope far exceed the automotive industry and have begun to penetrate into fields such as new energy battery management, machinery manufacturing, robotics, numerical control machine tools, medical instruments, electric locomotives, ships, and community security management. It is recognized as one of the most promising industrial fieldbuses.

[0005] Accordingly, the present utility model application proposes a CAN FD in-vehicle local area network wiring harness solution based on the idea of the CAN FD local area network bus. Its novel and unique features are as follows: First, only one main bus wiring harness based on the CAN FD in-vehicle local area network needs to be pulled out from the in-vehicle local area network central control box, rather than pulling out several in-vehicle local area network wiring harnesses from the in-vehicle local area network central control box multiple times; Second, multiple node branches are allowed to be connected outward on this pulled-out main CAN FD in-vehicle local area network wiring harness, and all node branches follow the CAN FD protocol, regardless of the CAN in-vehicle local area network wiring harnesses of three different rates, high, medium, and low; Third, LCD screen indication connectors are provided at the endpoints of all sub-node branches. Therefore, this CAN FD in-vehicle local area network wiring harness with LCD screen indication connectors shows strong real-time display and control capabilities at each node terminal, demonstrating the robustness of implementing the CAN FD protocol.

[0006] In 2017, one of the inventors of the present invention once proposed an "Electric Vehicle CAN Bus Local Area Network Integration Module Controller" (Patent Invention Number: ZL201710760842.0). Unfortunately, in the face of CAN FD, the idea of this network integration module controller is also obviously outdated. First of all, it is a network integration module based on standard CAN, and it is at a disadvantage in terms of performance compared with the prior art. Secondly, this network integration module controller does not have the function of displaying online data and status, so it still bears the traces of traditional wire control and shows incompleteness in function operation. Thirdly, this network integration module controller is built on the basis of a standard CAN bus local area network and only supports data packets of eight bytes, making it difficult to meet the new requirements in aspects such as edge computing, autonomous driving, and deep learning.

[0007] Accordingly, the present utility model application proposes a CAN FD in-vehicle local area network harness with an LCD screen indicating connector. The CAN FD followed by the system is actually a local area network bus protocol with high reliability, confidentiality, and strong error detection capabilities. Since CAN FD supports up to 64 data packets and adopts a more efficient CRC algorithm, it greatly improves the detection efficiency of data frame errors and the reliability of communication, and strongly reduces the risk of errors occurring between harnesses, effectively supporting the communication link for real-time control, that is, abandoning a large number of on-site signal connection cables and replacing them only with a single and simple CAN FD field bus, thus greatly reducing the complexity and cost of on-site signal connection and simplifying the complexity of on-site harnesses.

[0008] From the perspective of the physical structure of the network, CAN FD belongs to a bus-type multi-master communication network. Therefore, it is different from both the traditional analog 4mA - 20mA current loop, the BITBUS bit bus, and the master-slave type RS-485 protocol. In the 4mA - 20mA current loop, generally only one signal can be carried, usually a process variable. While the CAN FD bus transmits various device identifiers and diagnostic execution information along with the process variables during the transmission process, and the accuracy of its digital signal has a higher resolution than the 4mA - 20mA analog signal. On the other hand, an important difference between CAN FD and general local area networks is that it is a network specifically used in the field of industrial automation, different from the Internet for information processing, etc. Its physical characteristics and network protocol characteristics adopt the latest technologies and a unique hardware design with an LCD indicator screen, and its reliability and performance are much higher than those of obsolete field communication technologies. This is the technical background of this utility model application. In short, the CAN FD in-vehicle local area network harness with an LCD screen indicator connector allows us to truly feel the existence of this network world, and it is also one of the effective measures to ensure vehicle lightweight. Obviously, this utility model application will cause a redistribution of the wealth in the network harness market, and the value of its creativity and practicality is very obvious. Summary of the Invention

[0009] Accordingly, the applicant proposes a design scheme for a CAN FD in-vehicle local area network harness with an LCD screen indicator connector that is completely different from the traditional technical ideas.

[0010] The specific content is as follows:

[0011] The CAN FD in-vehicle local area network harness with an LCD screen indicator connector is composed of a main cable, branch cables A, B, C, a CAN FD in-vehicle local area network bus plug with an LCD screen indicator connector, a T-shaped sheath, and a sheath end cap. The key points are:

[0012] The outer sheath of the main cable is a wear-resistant corrugated pipe. At the branch node of the main cable and the branch line, there is a T-shaped sheath. After the branch cable is joined in parallel with the main cable, it extends out from the sheath end cap, and at the end of the branch cable, a CAN FD in-vehicle local area network bus plug with an LCD screen indicator connector is externally connected;

[0013] The main cable, branch cable A, branch cable B, and branch cable C are all four-wire cables, which are respectively defined as CAN+, CAN-, +12V, and common ground wire COM;

[0014] At both ends of the main cable, a CAN FD in-vehicle local area network bus plug with an LCD screen indicator connector is also externally connected to facilitate the expansion of other CAN FD nodes or connection to a host computer;

[0015] The described CAN FD in - vehicle local area network bus plug with an LCD - screen - indicating connector is a CAN in - vehicle local area network bus plug with a built - in digital indicator, that is, it includes two parts: an LCD - screen - indicating connector and a CAN in - vehicle local area network bus plug. The bus plug part meets the ISO / DIS 11898 international standard adopted by the International Organization for Standardization's ISO / TC22 Technical Committee. The digital indicator is equipped with an LCD screen, and around the LCD screen, there are a power - on indicator, a communication indicator, a node indicator, and a self - test indicator.

[0016] The described T - shaped sheath is an openable and closable sheath component with a sheath hinge. The main cable passes through the main channel of the T - shaped sheath. After the branch cable A, branch cable B, and branch cable C are paralleled with the main cable by a parallel - wire clamp, they then pass through the sheath branch channels and the sheath end - cap for output. Then, the sheath end - cap is connected to the external thread of the T - shaped sheath branch channel through the internal thread of the sheath end - cap.

[0017] Furthermore, the main cable is sleeved in a corrugated pipe embedded with steel wire material, and the connection of each branch cable to the main cable is encapsulated in the space formed by the T - shaped sheath and the sheath end - cap to prevent the cable from being damaged at the joint due to friction or causing a short - circuit fault between wires.

[0018] Furthermore, the described T - shaped sheath is injection - molded from engineering plastics with high temperature resistance and wear resistance.

[0019] Furthermore, the power - on indicator, communication indicator, node indicator, and self - test indicator all adopt energy - saving LED light - emitting diodes. Among them, when the node indicator is lit, it indicates that CAN FD is communicating with this node. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. The drawings only show an embodiment with one main cable and three branch cables. Obviously, for those skilled in the art, without creative efforts, they can draw inferences from one instance and obtain other similar drawings based on these drawings.

[0021] Figure 1 Appearance of the CAN FD in - vehicle local area network harness with an LCD - screen - indicating connector Figure 1 ;

[0022] Figure 2 Appearance of the CAN FD in - vehicle local area network harness with an LCD - screen - indicating connector Figure 2 ;

[0023] Figure 3Appearance of CAN FD In-Vehicle Local Area Network Harness with LCD Screen Indicator Connector Figure 3 ;

[0024] Figure 4 Disassembly of CAN FD In-Vehicle Local Area Network Harness with LCD Screen Indicator Connector Figure 4 ;

[0025] Figure 5 Appearance of the Connector with LCD Screen Indicator Figure 1 ;

[0026] Figure 6 Appearance of the Connector with LCD Screen Indicator Figure 2 ;

[0027] Figure 7 Appearance Diagram of T-shaped Sheath;

[0028] Figure 8 Disassembly of T-shaped Sheath Figure 1 ;

[0029] Figure 9 Disassembly of T-shaped Sheath Figure 2 。

[0030] 1 Main Cable

[0031] 2 Branch Cable A

[0032] 3 Branch Cable B

[0033] 4 Branch Cable C

[0034] 5 CAN FD In-Vehicle Local Area Network Bus Plug with LCD Screen Indicator Connector

[0035] 5-1 Digital Indicator

[0036] 5-2 LCD Screen

[0037] 5-3 Power Indicator Light

[0038] 5-4 Communication Indicator Light

[0039] 5-5 Node Indicator Light

[0040] 5-6 Self-Test Indicator Light

[0041] 6 T-shaped Sheath

[0042] 6-1 Main Channel of T-shaped Sheath

[0043] 6-2 Branch Channel of T-shaped Sheath

[0044] 6-3 External Thread of Branch Channel of T-shaped Sheath

[0045] 6-4 Sheath Hinge

[0046] 7 Sheath end cap

[0047] 7-1 Internal thread of sheath end cap Specific embodiments

[0048] The following combines with the attached drawings to illustrate the specific embodiments of the present utility model. The key points are as follows:

[0049] The CAN FD in-vehicle local area network harness with an LCD screen indicator connector is composed of a main cable (1), branch cables A (2), B (3), C (4), a CAN FD in-vehicle local area network bus plug (5) with an LCD screen indicator connector, a T-shaped sheath (6), and a sheath end cap (7). Its characteristics are as follows:

[0050] The outer sheath of the main cable (1) is a wear-resistant corrugated pipe. At the branch node of the main cable (1) and the branch line, there is a T-shaped sheath (6). After the branch cable is connected in parallel with the main cable (1), it then extends out from the sheath end cap (7), and at the end point of the branch cable, a CAN FD in-vehicle local area network bus plug (5) with an LCD screen indicator connector is externally connected;

[0051] The main cable (1), branch cable A (2), branch cable B (3), and branch cable C (4) are all four-wire cables, defined as CAN+, CAN-, +12V, and common ground wire COM;

[0052] At both ends of the main cable (1), a CAN FD in-vehicle local area network bus plug (5) with an LCD screen indicator connector can also be externally connected to facilitate the expansion of other nodes or connection to the upper computer;

[0053] The CAN FD in-vehicle local area network bus plug (5) with an LCD screen indicator connector is a CAN FD in-vehicle local area network bus plug with a built-in digital indicator (5-1). In terms of electrical specifications, it still follows the international standard ISO / DIS 11898 "ISO11898: High-Speed Controller Area Network Digital Information Exchange Standard for Road Vehicles" adopted by the Technical Committee ISO / TC22 of the International Organization for Standardization. The digital indicator (5-1) is equipped with an LCD screen (5-2), and around the LCD screen (5-2), there are a power indicator (5-3), a communication indicator (5-4), a node indicator (5-5), and a self-check indicator (5-6);

[0054] The T-shaped sheath (6) is an openable and closable sheath component with a sheath hinge (6-4). The main cable (1) passes through the T-shaped sheath main channel (6-1), and the branch cables A (2), B (3), and C (4) pass through the T-shaped sheath branch channel (6-2). The cables are then paralleled with the main cable (1) using a paralleling pliers, and then pass through the sheath branch channel (6-2) and the sheath end cover (7) for output. Then, the sheath end cover (7) is connected to the T-shaped sheath branch channel external thread (6-3) via the sheath end cover internal thread (7-1).

[0055] Furthermore, the main cable (1) is sheathed in a corrugated tube embedded with a steel wire material, and the connection between each branch cable and the main cable (1) is encapsulated in a space formed by a T-shaped sheath (6) and a sheath end cover (7).

[0056] Furthermore, the T-shaped sheath (6) is injection-molded using high-temperature-resistant and wear-resistant engineering plastics.

[0057] Furthermore, the power indicator light (5-3), the communication indicator light (5-4), the node indicator light (5-5), and the self-test indicator light (5-6) all adopt energy-saving LED light-emitting diodes, wherein when the node indicator light is on, it indicates that CAN FD is communicating with the node. Beneficial Effects

[0058] The CAN FD vehicle-mounted LAN wiring harness with LCD screen indicator connector proposed in the preferred embodiment of the utility model has the following significant beneficial effects:

[0059] The utility model proposes a CAN FD vehicle-mounted LAN wiring harness with an LCD screen indicator connector. With an integrated topological space, it is the first to combine the CAN FD interface connector, controller, LCD display and signal light indicator into one, truly realizing the most economical system and overall optimization, and directly ensuring the reliability of the CAN FD vehicle-mounted LAN wiring harness with an LCD screen indicator connector; on the other hand, the CAN FD bus greatly reduces the number of connection signal wiring harnesses between various devices on the car in a concise form. Due to its physical characteristics and network protocol characteristics, it emphasizes the bottom-level monitoring and control of industrial automation, thereby effectively promoting the lightweight level of new energy electric vehicles and avoiding the clutter and complexity of the field bus; at the same time, the CAN FD connector also raises the online monitoring technology of automotive field electronic equipment to a new management level due to its built-in LCD screen. Its main features are:

[0060] First, the CAN FD bus structure is simple and convenient. Especially with the addition of signal indicators and LCD screens, its control logic becomes more intuitive and clear. It allows users to design and select the physical connection drive method and voltage level according to their needs. Multiple microcontrollers and sensors can be directly connected to the bus through the node controller of CAN FD, forming multi-master access and communication between the host computer and node units. The physical connection medium can be either the inexpensive balanced twisted pair differential drive, or the single-wire plus ground wire drive method, or even the optical cable drive. The number of units that can be connected to the communication link bus is only limited by the delay time or the maximum electrical load that the bus can withstand.

[0061] Second, compared with other serial data communication protocols, CAN FD adopts the non-destructive bus priority arbitration technology and the timestamp function of data synchronous transmission. When two nodes send data to the bus simultaneously, the data with a higher priority level enjoys the priority to occupy the bus. The node with a lower priority level will actively stop data transmission to ensure that the node with a higher priority level can continue to transmit data without being affected, thus greatly saving the arbitration time when bus conflicts occur.

[0062] Third, CAN FD can automatically identify faults and recover autonomously, and has an automatic error correction function. When a serious error occurs in the wiring harness of a certain CAN node, it can autonomously shut down and cut off the communication link between this node and the bus, so that the operations of other nodes on the bus are not affected. This ensures that the network will not become paralyzed even when the load is very heavy, which is quite important for ensuring the safe driving of electric vehicles.

[0063] Fourth, since the CAN FD bus operates in a multi-master mode, any node on the network can actively send information to other nodes on the network at any time, achieving multi-master access without distinguishing between master and slave communication. The communication method is quite flexible. Using this feature, it is also convenient to form an in-vehicle multi-computer backup redundant system to improve the reliability of the control system.

[0064] Fifth, the reason why the CAN FD in-vehicle local area network with an LCD screen indicator connector has been recognized by the applicant is a crucial one, that is, its bright application prospect. It solves the problem of data exchange and communication between a large number of microprocessors, sensors and actuators with a small number of wiring harnesses inside modern cars or electric vehicles. Because currently, the signal wires connecting all the electronic devices, power batteries and equipment on an electric car will be more than a hundred times that of the past car wiring harness. The reliability of the connection of numerous car wiring harnesses and equipment itself becomes a problem. Moreover, the connection of numerous wiring harnesses not only causes difficulties in maintenance, but more importantly, the weight of hundreds of kilograms of wiring harnesses will become the biggest obstacle to the further lightweight of the car.

[0065] Sixth, in terms of control strategy, the CAN FD vehicle-mounted LAN bus with LCD screen indicator connector has both multi-master parallel peer control mode and distributed system architecture control mode, wherein, in the multi-master parallel control mode, each harness node can autonomously call the other node with a specific ID number to achieve system redundant cooperation; in the distributed system architecture mode, each harness node can also be responsible for controlling a nearby subtask of the system. In short, during the working process, each harness node realizes dynamic information exchange on the CAN FD bus through the LCD screen on the connector, including displaying the call information of the node control and the response information of the node, and dynamically refreshing the different operating conditions on the CAN FD vehicle-mounted LAN.

[0066] It is particularly important that the utility model application introduces a brand new CANFD vehicle LAN bus product that has never been seen on the market, rather than an innovative method, and its application scope has been extended to the battery management system of special power supply and distribution units. All the design drawings of the utility model are engineered, among which the most substantial improvement is to connect the LCD screen indicator connector with the CAN FD vehicle LAN bus connector, and to strengthen the protection of the parallel connection of the main cable and the branch cable by a T-shaped sheath, thereby greatly improving the reliability of the connection of the CAN FD bus at the parallel interface.

[0067] In the utility model, the main communication cable is composed of ordinary spiral balanced four-twisted wires without special requirements. Terminal impedance matching technology is adopted at both ends of the bus. The main cable of the CAN FD vehicle-mounted LAN bus is firstly sheathed in a corrugated tube, and then wear-resistant steel wire material is embedded in the outer wall of the corrugated tube. The environmental mapping interference is reduced by single-end grounding of the corrugated tube with steel wire material, thereby greatly reducing the rising and falling slopes of the radio frequency interference and improving the anti-interference ability of the network.

[0068] The utility model application adopts a detachable integrated topological structure, which ensures that the CAN FD vehicle-mounted LAN wiring harness with an LCD screen indicator connector can be widely used in new energy electric vehicle CAN vehicle-mounted LAN bus equipment or BMS control devices of high-power backup energy storage batteries; in terms of structure, the problem of replacing the LCD screen indicator after aging is also considered, that is, the LCD screen indicator component can be easily and quickly removed and replaced through a rotating operation.

[0069] In this specification, specific implementation examples are used to elaborate on the principles and implementation manners of the present utility model, which are only for helping to understand the core idea of the present utility model and should not be construed as a limitation to the present utility model. Those skilled in the art understand that all changes made to the present utility model in terms of form and details within the spirit and scope of the present utility model defined by the appended claims and the specification belong to the protection scope of the present utility model.

Claims

1. A CAN FD vehicle-mounted LAN wiring harness with an LCD screen indicator connector, comprising a main cable (1) and branch cables A (2), branch cables B (3), branch cables C (4), a CAN FD vehicle-mounted LAN bus plug with an LCD screen indicator connector (5), a T-shaped sheath (6) and a sheath end cover (7), and is characterized in that: The main cable (1) is covered with a wear-resistant corrugated tube, and has a T-shaped sheath (6) at the branch node between the main cable (1) and the branch cable. After the branch cable is connected to the main cable (1) in parallel, it extends out from the sheath end cover (7), and a CAN FD vehicle LAN bus plug (5) with an LCD screen indicator connector is externally connected at the end point of the branch cable. The main cable (1) and branch cable A (2), branch cable B (3), and branch cable C (4) are all four-wire cables, which are defined as CAN+, CAN-, +12V, and a common ground wire COM; The two ends of the main cable (1) may also be externally connected to a CAN FD vehicle-mounted LAN bus plug (5) with an LCD screen indicator connector; The CAN FD vehicle-mounted LAN bus plug (5) with an LCD screen indicator connector is a CAN FD vehicle-mounted LAN bus plug with a built-in digital indicator (5-1). The electrical specifications still comply with the ISO / DIS 11898 international standard "ISO11898: High-speed control LAN digital information exchange standard for road vehicles" adopted by the ISO / TC22 technical committee of the International Organization for Standardization. The digital indicator (5-1) is provided with an LCD screen (5-2), and the LCD screen (5-2) is surrounded by a power indicator light (5-3), a communication indicator light (5-4), a node indicator light (5-5) and a self-test indicator light (5-6); The T-shaped sheath (6) is an openable and closable sheath component with a sheath hinge (6-4). The main cable (1) passes through the T-shaped sheath main channel (6-1), and the branch cables A (2), B (3), and C (4) pass through the T-shaped sheath branch channel (6-2). The cables are then paralleled with the main cable (1) using a paralleling pliers, and then pass through the sheath branch channel (6-2) and the sheath end cover (7) for output. Then, the sheath end cover (7) is connected to the T-shaped sheath branch channel external thread (6-3) via the sheath end cover internal thread (7-1).

2. The CAN FD vehicle-mounted LAN wiring harness with LCD screen indicator connector according to claim 1, characterized in that: The main cable (1) is sheathed in a corrugated tube embedded with a steel wire material, and the connection between each branch cable and the main cable (1) is encapsulated in a space formed by a T-shaped sheath (6) and a sheath end cover (7).

3. The CAN FD vehicle-mounted LAN wiring harness with LCD screen indicator connector according to claim 1, characterized in that: The T-shaped sheath (6) is injection-molded using high-temperature-resistant and wear-resistant engineering plastics.

4. The CAN FD vehicle-mounted LAN wiring harness with LCD screen indicator connector according to claim 1, characterized in that: The power indicator light (5-3), communication indicator light (5-4), node indicator light (5-5), and self-test indicator light (5-6) are all LED light-emitting diodes.

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