CAN (Controller Area Network)-to-wireless transmission device for power van load distribution

Abstract

The utility model belongs to the technical field of wireless transmission equipment, and particularly discloses a CAN (Controller Area Network)-to-wireless transmission device for power van load distribution, which comprises a CAN bus interface module, a dual-frequency dual-mode wireless transmission module and a lifting type signal antenna mast, one end of the CAN bus interface module is connected with a CAN controller of the power van and is used for receiving CAN data, and the other end of the CAN bus interface module is connected with the dual-frequency dual-mode wireless transmission module; the dual-frequency dual-mode wireless transmission module comprises a Wi F i sub-module, a 5G sub-module and an intelligent switching transmission unit, the intelligent switching transmission unit is connected with the CAN bus interface module, and the Wi F i sub-module and the 5G sub-module are both connected with the intelligent switching transmission unit; the signal connection end of the lifting type signal antenna rod is connected with the Wi F i sub-module and the 5G sub-module. According to the technical scheme, the dual-frequency dual-mode wireless transmission module is utilized, cooperative switching between Wi F i and 5G is achieved, and the signal receiving and transmitting capacity in the vehicle body environment is enhanced.

Description

Technical Field

[0001] This utility model belongs to the field of wireless transmission equipment technology, and relates to a CAN-to-wireless transmission device for load distribution in power supply vehicles. Background Technology

[0002] With the development of Industry 4.0 and intelligent power vehicles, the demand for wireless and flexible equipment has surged. Existing wireless technologies have problems such as short transmission distance, high latency, and insufficient bandwidth, making it difficult to meet the long-distance wireless interconnection needs of distributed devices (such as mobile power vehicles and mobile energy storage vehicles).

[0003] When multiple power supply vehicles are connected in parallel, the load distribution system needs to transmit multi-node CAN bus data in real time. Currently, the mainstream parallel controllers use the CANopen protocol, with a transmission rate of approximately 500Kbps. In high-performance applications such as non-data centers, the latency is generally required to be no more than 50ms.

[0004] Traditional wired CAN buses are limited by physical wiring, making them difficult to adapt to complex terrains or mobile scenarios. Furthermore, the actual total effective communication distance for multiple devices is ≤200m. When multiple devices are connected in parallel, short CAN cables restrict vehicle placement based on terrain, while long cables reduce the total parallel capacity. Existing wireless transmission solutions (such as Bluetooth, LoRa, traditional WiFi, and 4G) have the following problems:

[0005] -Single network dependence: Insufficient 4G coverage in areas can easily lead to communication interruptions, and WiFi has a short transmission distance;

[0006] - Low speed and high latency fluctuation: Although LoRa can transmit over distances of several kilometers, its speed is low (<50kbps) and its latency is high (hundreds of milliseconds to several seconds). Wireless channel interference causes unstable end-to-end latency, affecting load balancing decisions; Bluetooth latency also cannot meet the industrial needs in this scenario.

[0007] -Signal attenuation: The metal body of the power supply vehicle has a significant shielding effect, and the fixed installation of the antenna results in low signal transmission and reception efficiency.

[0008] -Low reliability: A single communication module is susceptible to channel interference, leading to data packet loss.

[0009] In existing technologies, patent CN202410781401.9 discloses a network switching device for a vehicle-mounted communication terminal, which determines whether to switch the first SIM card to the second SIM card by using a first network quality indicator. This enables dynamic switching between 5G networks from different operators, effectively ensuring signal stability, but it does not solve the signal blind spot problem. Patent CN119253234 A discloses a vehicle-mounted antenna lifting device, which raises the antenna height using a telescopic rod, but it does not coordinate with the communication protocol to automatically adjust the height and angle to achieve the best signal state. While existing CAN-to-WiFi modules integrate antennas, they are prone to signal attenuation after being installed in devices, leading to a sharp reduction in communication distance. Utility Model Content

[0010] The purpose of this invention is to provide a CAN-to-wireless transmission device for load distribution in power supply vehicles, in order to solve the problem of blind spots in single network coverage.

[0011] To achieve the above objectives, the basic solution of this utility model is: a CAN-to-wireless transmission device for load distribution in a power vehicle, comprising a CAN bus interface module, a dual-frequency dual-mode wireless transmission module, and a lifting signal antenna mast.

[0012] One end of the CAN bus interface module is connected to the CAN controller of the power vehicle to receive CAN data, and the other end of the CAN bus interface module is connected to the dual-frequency dual-mode wireless transmission module.

[0013] The dual-band dual-mode wireless transmission module includes a WiFi submodule, a 5G submodule, and an intelligent switching transmission unit. The intelligent switching transmission unit is connected to the CAN bus interface module, and both the WiFi submodule and the 5G submodule are connected to the intelligent switching transmission unit.

[0014] The signal connection terminals of the lifting signal antenna mast are connected to the WiFi submodule and the 5G submodule, respectively.

[0015] The working principle and beneficial effects of this basic solution are as follows: This technical solution collects CAN information from the power supply vehicle through the CAN bus interface module and transmits it to the dual-frequency dual-mode wireless transmission module. It utilizes an intelligent switching transmission unit to select the transmission link, with 5G and WiFi complementing each other, enabling seamless switching between urban and rural scenarios and solving the problem of blind spots in single network coverage.

[0016] Furthermore, the lifting signal antenna mast includes a dual-frequency antenna array, a GPS antenna, a multi-stage electric telescopic mast, a lifting motor, a rotary motor, an antenna mast mounting base, and a control module;

[0017] The dual-frequency antenna array and GPS antenna are located at the top of the multi-stage electric telescopic pole, and the bottom of the multi-stage electric telescopic pole is connected to the telescopic end of the lifting motor.

[0018] The lifting motor is mounted on the rotating shaft of the rotary motor, and the rotary motor is mounted on the antenna mast mounting base;

[0019] The control module includes a comparator. The input terminal of the comparator is connected to the signal strength output terminal of the dual-frequency dual-mode wireless transmission module, and is used to receive the signal quality information output by the dual-frequency dual-mode wireless transmission module. The output terminal of the comparator is connected to the control terminal of the lifting motor.

[0020] The height-adjustable antenna structure adjusts its height based on signal quality information, optimizing the signal-to-noise ratio. A comparator compares signal strength; a high level controls the antenna to rise, and a low level controls it to fall.

[0021] Furthermore, the control module also includes a memory that stores antenna height data corresponding to different latitudes, longitudes, and altitudes. The position signal input terminal of the control module is connected to the signal output terminal of the GPS antenna. The control module retrieves antenna height data of the same position from the memory based on the received position signal, and controls the lifting motor to adjust the antenna height according to the antenna height data.

[0022] The data in the memory can be preset, or it can receive antenna height data from other vehicles at the same latitude and longitude in real time.

[0023] Furthermore, the control module is mounted on the antenna mast mounting base, and the dual-frequency antenna array and GPS antenna are connected to the control module via spiral signal lines.

[0024] The structure is simple and easy to use. The spiral design facilitates the extension and retraction of the multi-stage electric telescopic rod and makes it easy to store.

[0025] Furthermore, the dual-frequency antenna array and GPS antenna are magnetic antennas.

[0026] It uses a magnetic antenna, which is easy to disassemble and assemble.

[0027] Furthermore, it also includes a power module, which is connected to the power supply terminal of the dual-band dual-mode wireless transmission module.

[0028] The power module ensures the equipment is powered, facilitating its use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the CAN-to-wireless transmission device for load distribution in a power vehicle according to this utility model.

[0030] Figure 2This is a flowchart illustrating the CAN-to-wireless transmission device for load distribution in a power vehicle, as described in this utility model.

[0031] The reference numerals in the accompanying drawings include: CAN bus interface module 1, dual-band dual-mode wireless transmission module 2, WiFi sub-module 2-1, 5G sub-module 2-2, intelligent switching transmission unit 2-3, lifting signal antenna mast 3, dual-band antenna array 3-1, spiral signal line 3-2, multi-stage electric telescopic mast 3-3, lifting motor 3-4, rotating motor 3-5, antenna mast fixing base 3-6, and power module 4. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0035] This utility model discloses a CAN-to-wireless transmission device for load distribution in power supply vehicles, solving the problem of blind spots in single network coverage, reducing wireless transmission latency and improving reliability, and enhancing signal transmission and reception capabilities in the vehicle environment. Figure 1 and Figure 2 As shown, the CAN-to-wireless transmission device includes a CAN bus interface module 1 (which can be the existing TJA1050 from Shenzhen Parex Technology Co., Ltd.), a dual-band dual-mode wireless transmission module 2, and a lifting signal antenna mast 3.

[0036] One end of the CAN bus interface module 1 is electrically connected to the CAN controller of the power supply vehicle to receive CAN data, and the other end is electrically connected to the dual-frequency dual-mode wireless transmission module 2. The CAN bus interface module 1 supports the ISO11898-2 standard CAN controller, integrates electrical isolation circuitry (2500VDC), and is directly connected to the power supply vehicle's ECU, BMS, and parallel controller. It is responsible for encapsulating and parsing CAN signals.

[0037] The dual-band dual-mode wireless transmission module 2 includes a WiFi sub-module 2-1, a 5G sub-module 2-2, and an intelligent switching transmission unit 2-3. The intelligent switching transmission unit 2-3 is electrically connected to the CAN bus interface module 1. Both the WiFi sub-module 2-1 and the 5G sub-module 2-2 are electrically connected to the intelligent switching transmission unit 2-3. The dual-band dual-mode wireless transmission module 2 includes the intelligent switching transmission unit 2-3, which can utilize the MediaTek M80 5G baseband and its existing MediaTek HyperEngine network engine to provide a low-latency, high-stability communication experience for dynamic switching requirements in different network environments (such as 5G Sub-6GHz, millimeter wave, Wi-Fi, etc.).

[0038] The dual-band dual-mode wireless transmission module 2 can utilize the MTK7981BA 5G CPE development board from Shenzhen Qiming Zhixian Technology, integrating a 5G (dual SIM) + Wi-Fi interface and supporting multiple operator network standards. The Wi-Fi submodule 2-1 supports 320MHz channel bandwidth and MLO (Multi-Link Aggregation), with a maximum speed of 30Gbps. The 5G submodule 2-2 supports Sub-6GHz and millimeter-wave bands, integrates URLLC network slicing, and supports dual SIM cards. The intelligent switching transmission unit 2-3 dynamically selects the transmission link based on signal strength (RSRP), latency (RTT), and bandwidth threshold (i.e., CAN data).

[0039] The signal connection terminals of the pop-up signal antenna mast 3 are electrically connected to the WiFi submodule 2-1 and the 5G submodule 2-2, respectively. The pop-up antenna improves the signal strength by 6-8 dB and the bit error rate is <10. -6 .

[0040] The CAN information of the power supply vehicle is collected by the CAN bus interface module 1 and transmitted to the dual-frequency dual-mode wireless transmission module 2. The intelligent switching transmission unit 2-3 selects the transmission link, with 5G and WiFi complementing each other, enabling seamless switching between urban and field scenarios and solving the problem of blind spots in single network coverage.

[0041] In a preferred embodiment of this utility model, the lifting signal antenna mast 3 includes a dual-frequency antenna array 3-1, a GPS antenna, a multi-stage electric telescopic mast 3-3 (travel 0.5-3m), a lifting motor 3-4, a rotary motor 3-5, an antenna mast fixing base 3-6, and a control module.

[0042] The dual-frequency antenna array 3-1 and the GPS antenna are set at the top of the multi-stage electric telescopic pole 3-3. The bottom of the multi-stage electric telescopic pole 3-3 is connected to the telescopic end of the lifting motor 3-4 (e.g., by welding, bonding, snapping, etc.).

[0043] The lifting motor 3-4 is mounted (e.g., by welding) on ​​the rotating shaft of the rotary motor 3-5, and the rotary motor 3-5 is mounted (e.g., by welding, riveting, etc.) on the antenna mast mounting base 3-6. The approximate locations of other nearby units can be determined first using GPS positioning. Then, the rotary motor can be controlled to rotate, allowing the WIFI antenna to connect point-to-point with the WIFI antennas of nearby units for stronger signal transmission. Alternatively, the WIFI antenna can be configured to surround the surrounding units in a 360-degree pattern.

[0044] The input terminals of the control module are electrically connected to the dual-band antenna array 3-1, the GPS antenna, and the dual-band dual-mode wireless transmission module 2 (which switches to Wi-Fi connection when the 5G signal is poor and adjustment is ineffective). It receives GPS positioning signals and signal quality information (this information is transmitted by the dual-band dual-mode wireless transmission module 2; the MediaTek M805G baseband chip decodes the baseband signal output from the RF chip and measures key parameters: RSRP (Reference Signal Received Power): reflects signal strength, measured in dBm (e.g., -70dBm indicates a strong signal); SINR (Signal to Interference Plus Noise Ratio): measures signal quality; a higher value indicates less interference. These parameters are transmitted by the baseband chip through the protocol stack via the signal line (e.g., a network cable) between the dual-band dual-mode wireless transmission module 2 and the control module).

[0045] The control module includes a comparator. The first input of the comparator is electrically connected to the signal strength output of the dual-band dual-mode wireless transmission module, used to receive signal quality information output by the dual-band dual-mode wireless transmission module. The second input of the comparator is connected to a signal strength threshold memory, and the output of the comparator is electrically connected to the control terminal of the lifting motor. The comparator can be a digital comparator or an analog comparator, such as LM324 or LM339. The first input of the comparator can be electrically connected to a digital-to-analog converter module (such as AK4021) as needed.

[0046] The retractable signal antenna mast 3 incorporates a control module, a lifting motor 3-4, and a rotating motor 3-5. The lifting motor 3-4 controls the height, and the rotating motor 3-5 controls the angle. A GPS antenna is mounted atop the multi-stage electric telescopic mast 3-3. The control module uses the GPS (Global Positioning System) antenna to receive satellite signals to determine its location, acquiring not only latitude and longitude information but also altitude. At this height, it employs obstruction detection and signal strength feedback from the dual-frequency dual-mode wireless transmission module to perform fine-tuning within ±20cm and ±5° to maximize signal strength. The control module also supports manual adjustment, which can be used for emergency adjustments when communication and data exchange between vehicles are impossible before antenna adjustment.

[0047] The height-adjustable antenna structure adjusts its height based on environmental feedback (such as obstruction detection) to optimize the signal-to-noise ratio. It automatically adjusts its height (to maximum when entering a tunnel) and angle (directional transmission and reception) based on GPS positioning and signal quality.

[0048] Preferably, the control module also includes a memory (such as the 24CXX series, 93CXX series, etc.). The memory stores antenna height data corresponding to different latitudes, longitudes, and altitudes. The data in the memory can be preset or can be collected in real time from other vehicles. The position signal input terminal of the control module is electrically connected to the signal output terminal of the GPS antenna. The control module retrieves the antenna height data of the same location from the memory based on the received position signal, and controls the lifting motor to adjust the antenna height according to the antenna height data.

[0049] More preferably, the control module is mounted (e.g., welded, glued) on the antenna mast mounting base 3-6, and the dual-frequency antenna array 3-1 and the GPS antenna are electrically connected to the control module via a spiral signal line 3-2. The spiral signal line 3-2 facilitates the extension and retraction of the multi-stage electric telescopic mast and makes it easy to store.

[0050] In a preferred embodiment of this invention, the dual-frequency antenna array 3-1 and the GPS antenna are magnetic antennas. Using a magnetic antenna facilitates disassembly and assembly.

[0051] In a preferred embodiment of this invention, the CAN-to-wireless transmission device further includes a power module 4 (such as the DC-DC regulated output short-circuit protection isolation power module URB4812LMD-50WR3 from Shenzhen Hailingke Electronics Co., Ltd.), which is electrically connected to the power supply terminal of the dual-band dual-mode wireless transmission module 2. The power module 4 supports a wide voltage input of 12 / 24V and has a built-in supercapacitor to cope with voltage fluctuations during vehicle start-stop operation.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A CAN to wireless transmission device for power car load distribution, characterized in that, The CAN bus interface module, the dual-frequency dual-mode wireless transmission module and the lifting signal antenna pole are included. One end of the CAN bus interface module is connected with the CAN controller of the power supply vehicle for receiving CAN data, and the other end of the CAN bus interface module is connected with the dual-frequency dual-mode wireless transmission module. The dual-frequency dual-mode wireless transmission module includes a WiFi sub-module, a 5G sub-module and an intelligent switching transmission unit, the intelligent switching transmission unit is connected with the CAN bus interface module, and the WiFi sub-module and the 5G sub-module are connected with the intelligent switching transmission unit. The signal connection end of the lifting signal antenna pole is connected with the WiFi sub-module and the 5G sub-module respectively.

2. The CAN to wireless transmission device for power car load distribution of claim 1, wherein, The lifting signal antenna pole includes a dual-frequency antenna array, a GPS antenna, a multi-stage electric telescopic pole, a lifting motor, an antenna pole fixing seat and a control module. The dual-frequency antenna array and the GPS antenna are arranged at the top of the multi-stage electric telescopic pole, and the bottom of the multi-stage electric telescopic pole is connected with the telescopic end of the lifting motor. The lifting motor is installed on the antenna pole fixing seat. The control module includes a comparator, the input end of the comparator of the control module is connected with the signal strength output end of the dual-frequency dual-mode wireless transmission module for receiving the signal quality information output by the dual-frequency dual-mode wireless transmission module, and the output end of the comparator is connected with the control end of the lifting motor.

3. The CAN to wireless transmission device for power car load distribution of claim 2, wherein, The control module further includes a memory, the memory stores antenna height data corresponding to different latitude, longitude and altitude, the position signal input end of the control module is connected with the signal output end of the GPS antenna, the control module retrieves the antenna height data of the same position in the memory according to the received position signal, and the height of the antenna is adjusted according to the antenna height data.

4. The CAN to wireless transfer device for power car load distribution of claim 2, wherein, The control module is installed on the antenna pole fixing seat, and the dual-frequency antenna array and the GPS antenna are connected with the control module through spiral signal lines.

5. The CAN to wireless transmission device for power car load distribution of claim 2, wherein, The dual-frequency antenna array and the GPS antenna are magnetic type antennas.

6. The CAN to wireless transfer device for power car load distribution of claim 1, wherein, A power module is further included, and the power module is connected with the power supply end of the dual-frequency dual-mode wireless transmission module.

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