Vehicle-mounted weighing device

Abstract

The utility model relates to a vehicle-mounted weighing device, which comprises a pressure data acquirer, a vehicle-mounted weighing controller and a display, the pressure data acquirer comprises a plurality of suspension embedded pressure sensors, the suspension embedded pressure sensors are uniformly arranged on a vehicle suspension, and the suspension embedded pressure sensors are electrically connected with the vehicle-mounted weighing controller through cables with shielding layers; the vehicle-mounted weighing controller is fixed to the inner wall of a vehicle cab, the displayer is embedded into a center console of a vehicle, and the vehicle-mounted weighing controller is connected with the displayer through a CAN bus interface. The pressure data acquisition device acquires pressure data borne by the current vehicle and sends the pressure data to the vehicle-mounted weighing controller; and the vehicle-mounted weighing controller reads the pressure data, sends the pressure data to an external data platform by using an internal communicator, and sends the returned load data to a display for displaying. The device can break through technical bottlenecks among data accuracy, operation and maintenance efficiency and working condition adaptability.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive electrical component system test benches, specifically relating to an on-board weighing device. Background Technology

[0002] In the field of commercial vehicle load monitoring, traditional weighing systems often face core problems such as data inaccuracy under dynamic operating conditions and insufficient anti-interference capabilities. Existing technologies mostly use single-position sensors to collect pressure signals, which are easily distorted by vehicle vibration, road bumps, and engine electromagnetic interference. Furthermore, they lack multi-axis load collaborative analysis capabilities, making it difficult to accurately reflect the overall vehicle load distribution. In addition, the debugging of traditional devices relies on real load simulation, resulting in cumbersome testing procedures and long calibration cycles, failing to meet the needs of efficient factory testing and on-site maintenance. Regarding hardware adaptability, ordinary electronic equipment cannot withstand the mechanical shocks and voltage fluctuations under complex vehicle operating conditions, and poor communication interface compatibility restricts system reliability and expansion potential. To address these pain points, there is an urgent need for an on-board weighing solution that integrates high-precision dynamic monitoring, a modular testing system, and automotive-grade stability to overcome the technical bottlenecks in data accuracy, operational efficiency, and operating condition adaptability. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a vehicle-mounted weighing device. The technical problem to be solved by this utility model is achieved through the following technical solution:

[0004] This utility model provides a vehicle-mounted weighing device, including: a pressure data acquisition unit, a vehicle-mounted weighing controller, and a display; the pressure data acquisition unit includes multiple suspension-embedded pressure sensors, each of which is evenly disposed on the vehicle suspension, and each of the suspension-embedded pressure sensors is electrically connected to the vehicle-mounted weighing controller via a shielded cable; the vehicle-mounted weighing controller is fixed to the inner wall of the vehicle's cab, and the display is embedded in the vehicle's center console, with the vehicle-mounted weighing controller and the display connected via a CAN bus interface; the pressure data acquisition unit is used to acquire the pressure data currently being borne by the vehicle and send the pressure data to the vehicle-mounted weighing controller; the vehicle-mounted weighing controller is used to read the pressure data, send the pressure data to an external data platform using an internal communicator, receive load data returned by the external data platform, and send the load data to the display; the display is used to display the load data.

[0005] Preferably, the plurality of suspension-embedded pressure sensors include: a left front pressure sensor, a left center pressure sensor, a left rear pressure sensor, a right front pressure sensor, a right center pressure sensor, and a right rear pressure sensor; wherein, the left front pressure sensor is threadedly fixed at the left front wheel of the vehicle to obtain pressure data at the left front wheel; the left center pressure sensor is threadedly fixed at the left center wheel of the vehicle to obtain pressure data at the left center wheel; the left rear pressure sensor is threadedly fixed at the left rear wheel of the vehicle to obtain pressure data at the left rear wheel; the right front pressure sensor is threadedly fixed at the right front wheel of the vehicle to obtain pressure data at the right front wheel; the right center pressure sensor is threadedly fixed at the right center wheel of the vehicle to obtain pressure data at the right center wheel; and the right rear pressure sensor is threadedly fixed at the right rear wheel of the vehicle to obtain pressure data at the right rear wheel.

[0006] Preferably, the vehicle-mounted weighing device further includes: a first manual reset button; the manual reset button is electrically connected to the plurality of suspension embedded pressure sensors respectively through shielded cables, and is used to force the plurality of suspension embedded pressure sensors to zero.

[0007] Preferably, the vehicle-mounted weighing device further includes: a VAC to VDC switching power supply, which is used to provide VDC voltage to the pressure data acquisition unit, the vehicle-mounted weighing controller and the display respectively.

[0008] Preferably, the vehicle-mounted weighing device further includes: a test box; the test box is used to test whether the vehicle-mounted weighing device can work normally; the test box panel integrates: multiple voltage signal generators, each voltage signal generator is used to output simulated pressure signals at different suspension positions of the vehicle, and one voltage signal generator corresponds to one of the multiple suspension embedded pressure sensors; a main switch button, used to power on or off the test box; a second manual reset button, used to force the output values ​​of the multiple voltage signal generators to zero; V+ and GND interfaces, connected to the test box with banana plugs, used to provide power to the vehicle-mounted weighing controller and the display; CAN_H and CAN_L interfaces, connected to the test box with banana plugs, for monitoring and debugging the CAN bus interface; and a terminal block, the terminal block being used to gather the outputs of the multiple voltage signal generators, the main switch button, the second manual reset button, the V+ and GND interfaces, and the CAN_H and CAN_L interfaces inside the test box, for electrical connection with the vehicle-mounted weighing controller and the display.

[0009] Preferably, each voltage signal generator includes an amplitude adjustment knob with scale markings and a three-digit LED display for displaying the output voltage value in real time.

[0010] Preferably, the amplitude adjustment of each amplitude adjustment knob is set to 0.5V~4.5V.

[0011] Preferably, the vehicle-mounted weighing device further includes: a CAN box, the CAN box being electrically connected to the CAN_H and CAN_L interfaces, as well as the vehicle-mounted weighing controller and the display.

[0012] Preferably, the back of the test box is provided with a threaded hole for fixing the box to a pre-set stud on the outside of the vehicle.

[0013] Preferably, the back of the test box is provided with a non-slip silicone grip groove for hand use.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] (1) This utility model directly collects the pressure load at each wheel axle of the vehicle through the distributed layout of multi-position embedded pressure sensors in the suspension. Combined with the transmission of shielded cables, it effectively suppresses electromagnetic interference during vehicle operation and ensures the high fidelity of the original pressure data. The vehicle-mounted weighing controller communicates stably with the display via the CAN bus, processes and displays the load information in real time, and meets the accuracy requirements of dynamic weighing.

[0016] (2) The device is equipped with an independent test box, which simulates the pressure input of each suspension through an adjustable voltage signal. It can be quickly zeroed and calibrated with a manual reset button, simplifying the debugging process. The test box integrates a power interface, a signal generation module and bus monitoring function to form a closed-loop detection system, avoiding problems such as messy wiring and signal interference. It facilitates functional verification before leaving the factory and troubleshooting during use, significantly improving maintenance efficiency and helping to reduce the simulation cost of the whole vehicle.

[0017] (3) The hardware design adopts automotive-grade power modules and shielded cables to adapt to voltage fluctuations and mechanical vibrations under complex vehicle operating conditions. The test box connects to the vehicle system through a standard interface, supporting rapid deployment and disassembly. Its structural design takes into account the flexibility of fixed installation and handheld operation, ensuring the stable operation and adaptability of the device in different scenarios. Attached Figure Description

[0018] Figure 1 This is a top-down view of the structural position of a vehicle-mounted weighing device after it has been installed in a vehicle, as provided by this utility model.

[0019] Figure 2 A circuit connection diagram of the vehicle-mounted weighing device provided by this utility model in a test state;

[0020] Figure 3 This is a schematic diagram of the test box panel provided by this utility model;

[0021] Figure 4 This is a schematic diagram of the display panel provided by this utility model;

[0022] Figure 5 This is a circuit connection diagram of the test box provided by this utility model.

[0023] Figure label:

[0024] 1-Pressure data acquisition unit; 2-Vehicle weighing controller; 3-Display; 4-First manual reset button; 5-Test box; 6-CAN box; 11-Suspension embedded pressure sensor; 31-Digital LED display; 32-Two-digit digital LED display; 51-Voltage signal generator; 52-Main switch button; 53-Second manual reset button; 54-24V+ and GND interfaces; 55-CAN_H and CAN_L interfaces; 56-Terminal block; 111-Left front pressure sensor ; 112-Left center pressure sensor; 113-Left rear pressure sensor; 114-Right front pressure sensor; 115-Right center pressure sensor; 116-Right rear pressure sensor; 511-Left front voltage signal generator; 512-Left center voltage signal generator; 513-Left rear voltage signal generator; 514-Right front voltage signal generator; 515-Right center voltage signal generator; 516-Right rear voltage signal generator; 5110-Amplitude adjustment knob; 5120-Three-digit LED display. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments, but the implementation of the present invention is not limited thereto.

[0026] The present invention provides a vehicle-mounted weighing device in conjunction with the accompanying drawings.

[0027] Figure 1 This is a top-down view of the structural position of a vehicle-mounted weighing device after installation in a vehicle, as provided by this utility model. Figure 1As shown, the system includes: a pressure data acquisition unit 1, an on-board weighing controller 2, and a display 3. The pressure data acquisition unit 1 includes multiple suspension-embedded pressure sensors 11, which are evenly arranged on the vehicle suspension. Each suspension-embedded pressure sensor 11 is electrically connected to the on-board weighing controller 2 via a shielded cable. The on-board weighing controller 2 is fixed to the inner wall of the vehicle's cab, and the display 3 is embedded in the vehicle's center console. The on-board weighing controller 2 and the display 3 are connected via a CAN bus interface. The pressure data acquisition unit 1 is used to acquire the pressure data currently being borne by the vehicle and send the pressure data to the on-board weighing controller 2. The on-board weighing controller 2 is used to read the pressure data, send the pressure data to an external data platform using an internal communicator, receive the load data returned by the external data platform, and send the load data to the display 3. The display 3 is used to display the load data.

[0028] In one possible implementation, the vehicle-mounted weighing controller 2 is equipped with a wireless communication terminal (such as Bluetooth, wireless network card, WiFi chip, ZigBee or Z-Wave) to send pressure data to an external data platform and receive load data.

[0029] It should be understood that, in one possible implementation, the vehicle-mounted weighing controller 2 of this utility model can also be a controller with an integrated external data platform that integrates data analysis capabilities. The core control part of this controller adopts an NXP S32K144 automotive-grade microcontroller with a built-in ARM Cortex-M4F core, a main frequency of 120MHz, and integrates a CAN FD controller and a 12-bit ADC module, meeting the AEC-Q100 Grade 2 standard. The S32K144 has a built-in DSP instruction set, which can perform FFT filtering and least squares fitting operations on pressure sensor data. When the pressure data acquisition unit 1 outputs a 0.5-4.5V analog signal, the S32K144's ADC acquires the data in a 16x oversampling mode, and after FIR digital filtering, sends it to the display 3 via CAN FD.

[0030] Here, the CAN bus is a highly reliable communication protocol used in vehicles, suitable for high-noise environments, and featuring a multi-master architecture and error detection mechanisms. In on-board weighing devices, real-time transmission of weight data to the display is crucial, making the low latency and reliability of CAN key. Furthermore, regarding wiring, the CAN bus typically uses twisted-pair cables, and both ends of the CAN bus interface—the on-board weighing controller 2 and the display 3—are equipped with 120Ω terminating resistors to eliminate signal reflections.

[0031] Here, multiple suspension-embedded pressure sensors 11 include: a left front pressure sensor 111, a left center pressure sensor 112, a left rear pressure sensor 113, a right front pressure sensor 114, a right center pressure sensor 115, and a right rear pressure sensor 116. The left front pressure sensor 111 is threadedly fixed to the left front wheel of the vehicle to obtain pressure data at that location; the left center pressure sensor 112 is threadedly fixed to the left center wheel of the vehicle to obtain pressure data at that location; the left rear pressure sensor 113 is threadedly fixed to the left rear wheel of the vehicle to obtain pressure data at that location; the right front pressure sensor 114 is threadedly fixed to the right front wheel of the vehicle to obtain pressure data at that location; the right center pressure sensor 115 is threadedly fixed to the right center wheel of the vehicle to obtain pressure data at that location; and the right rear pressure sensor 116 is threadedly fixed to the right rear wheel of the vehicle to obtain pressure data at that location.

[0032] It should be noted that the vehicle suspension is a core component of the vehicle chassis, and its components (not shown in the figure) include: elastic elements for cushioning road impacts (such as coil springs, leaf springs, and air springs); damping elements for suppressing vibrations (such as hydraulic dampers and electromagnetic dampers); guiding mechanisms for transmitting force and maintaining wheel alignment (such as control arms, linkages, and stabilizer bars); and auxiliary components for adjusting height / stiffness (such as air compressors and electronic control units). Here, multiple suspension-embedded pressure sensors 11 are threaded and embedded, positioned at different locations on the vehicle suspension to ensure rigid coupling with the suspension structure, reduce mechanical hysteresis errors, and suppress high-frequency interference generated by engine ignition, motor drive, etc., through shielded twisted-pair transmission, effectively improving the signal-to-noise ratio.

[0033] It should be understood that, in one possible implementation, a voltage signal generator can also be used to replace the multiple suspension-embedded pressure sensors 11 shown in the figure.

[0034] Please continue to refer to Figure 1 The vehicle-mounted weighing device also includes a first manual reset button 4. The manual reset button is electrically connected to multiple suspension-embedded pressure sensors 11 via shielded cables, and is used to force the multiple suspension-embedded pressure sensors 11 to zero. By using the first manual reset button 4, the zeroing operation is simplified. Compared to traditional methods that may require operation through the controller menu, the first manual reset button 4 provides direct physical operation, which is faster, effectively shortens the zeroing time, improves efficiency, and reduces the user's learning cost.

[0035] Please continue to refer to Figure 1The vehicle-mounted weighing device also includes a 220VAC to 24VDC switching power supply (not shown in the figure), which is used to provide 24VDC voltage to the pressure data acquisition unit 1, the vehicle-mounted weighing controller 2 and the display 3 respectively.

[0036] Figure 1 The actual structural distribution of the vehicle-mounted weighing device when it is installed on the vehicle, except Figure 1 In addition to the structure shown, this invention also includes a test box 5 for verifying the transmission accuracy of the vehicle-mounted weighing device. This test box 5 can replace multiple suspension-embedded pressure sensors 11 to generate pressure signals at different locations on the vehicle suspension. Figure 2 This is a circuit connection diagram of the vehicle-mounted weighing device provided by this utility model in the test state. Figure 3 This is a schematic diagram of the test box panel provided by this utility model; Figure 4 This is a schematic diagram of the display panel provided by this utility model; Figure 5 This is a circuit connection diagram of the test box provided by this utility model.

[0037] like Figure 2-4 As shown, test box 5 is used to test whether the vehicle-mounted weighing device can work properly. The test box 5's panel integrates: multiple voltage signal generators 51, each outputting simulated pressure signals at different suspension positions on the vehicle; one voltage signal generator 51 corresponds to one of the multiple suspension embedded pressure sensors 11; a main switch button 52 for powering on or off the test box 5; a second manual reset button 53 for forcing the output values ​​of the multiple voltage signal generators 51 to zero; and a 24V+ and GND interface 54. The banana plug is connected inside the test box 5 to provide power to the vehicle weighing controller 2 and the display 3; the CAN_H and CAN_L interfaces 55 are connected inside the test box 5 using banana plugs to monitor and debug the CAN bus interface; the terminal block 56 is used to gather the outputs of multiple voltage signal generators 51, main switch button 52, second manual reset button 53, 24V+ and GND interfaces 54, and CAN_H and CAN_L interfaces 55 inside the test box 5, so as to electrically connect them to the vehicle weighing controller 2 and the display 3.

[0038] Here, the left front voltage signal generator corresponding to the left front pressure sensor 111 is marked as 511, the left center voltage signal generator corresponding to the left center pressure sensor 112 is marked as 512, the left rear voltage signal generator corresponding to the left rear pressure sensor 113 is marked as 513, the right front voltage signal generator corresponding to the right front pressure sensor 114 is marked as 514, the right center voltage signal generator corresponding to the right center pressure sensor 115 is marked as 515, and the right rear voltage signal generator corresponding to the right rear pressure sensor 116 is marked as 516. Each voltage signal generator 51 includes an amplitude adjustment knob 5110 with scale markings and a three-digit LED display 5120 for real-time display of the output voltage value. The amplitude adjustment of each amplitude adjustment knob 5110 is adjusted from 0.5V to 4.5V.

[0039] For example, Table 1 shows the voltage values ​​of a vehicle model under a 90-ton full load condition simulated by multiple voltage signal generators. The returned load data shows that the actual simulated data matches the theoretical load data.

[0040] Table 1

[0041]

[0042] Here, in test mode, the vehicle-mounted weighing device also includes: a CAN box 6, which is electrically connected to the CAN_H and CAN_L interfaces 55, as well as the vehicle-mounted weighing controller 2 and the display 3. The CAN box 6 can be connected to a laptop computer serving as an external data analysis platform.

[0043] It should be understood that the CAN box 6 is located on the outside of the vehicle and the test box 5. In one possible implementation, the CAN box 6 can also be integrated inside the test box 5.

[0044] Please refer to Figure 4 The display panel 3 integrates a digital LED display 31 showing the current load of the vehicle in tons; and the display 3 also has six two-digit LED displays 32, which respectively display the pressure values ​​of the left front axle, the right front axle, the left middle axle, the right middle axle, the left rear axle, and the right rear axle, in MPa.

[0045] Please refer to Figure 5The test box 5 is connected to a 220V external power supply and uses an internal 220VAC to 24VDC module to convert it to 24V to power multiple internal voltage signal generators, a manual reset button, and to supply power to the vehicle weighing controller 2 and the display 3 via the 24V+ and GND interfaces 54. The main switch button 52 is a single-pole double-throw switch. During testing, the main switch button 52 on the test box 5 is closed, powering on the test box 5. The user manually rotates multiple amplitude adjustment knobs 5110 to output multiple voltage signals representing a certain pressure load at different locations. The vehicle weighing controller 2 sends voltage signals to the laptop computer and receives the returned load data, which is then displayed on the display 3.

[0046] It should be noted that the test box 5 is not installed inside the vehicle, but is installed at any location outside the vehicle. For example, the back of the test box 5 has threaded holes (not shown in the figure) for fixing the box to pre-set studs on the outside of the vehicle. Alternatively, the back of the test box 5 has anti-slip silicone grip grooves (not shown in the figure) for handheld use, allowing the user to hold the test box 5 and rotate the amplitude adjustment knob 5110.

[0047] In one embodiment, during vehicle assembly, multiple suspension-embedded pressure sensors 11 are installed at corresponding positions on the vehicle suspension, an on-board weighing controller 2 is installed on the inner wall of the vehicle cab, and a display 3 is embedded in the vehicle's center console. Each suspension-embedded pressure sensor 11 is electrically connected to the on-board weighing controller 2 via a shielded cable. The on-board weighing controller 2 and the display 3 are connected via a CAN bus interface. Subsequently, the working status of the on-board weighing device is debugged using a test box 5 and a CAN box 6. After confirming that the on-board weighing device can work normally and meets the factory requirements, the connection between the test box 5, the CAN box 6, the on-board weighing controller 2, and the display 3 is disconnected to complete the test. After leaving the factory, multiple voltage signal generators 51 collect pressure loads at different locations in real time to monitor the vehicle load during vehicle operation.

[0048] The vehicle-mounted weighing device provided by this utility model has the following technical advantages:

[0049] (1) This utility model directly collects the pressure load at each wheel axle of the vehicle through the distributed layout of multi-position embedded pressure sensors in the suspension. Combined with the transmission of shielded cables, it effectively suppresses electromagnetic interference during vehicle operation and ensures the high fidelity of the original pressure data. The vehicle-mounted weighing controller communicates stably with the display via the CAN bus, processes and displays the load information in real time, and meets the accuracy requirements of dynamic weighing.

[0050] (2) The device is equipped with an independent test box, which simulates the pressure input of each suspension through an adjustable voltage signal. It can be quickly zeroed and calibrated with a manual reset button, simplifying the debugging process. The test box integrates a power interface, a signal generation module and bus monitoring function to form a closed-loop detection system, avoiding problems such as messy wiring and signal interference. It facilitates functional verification before leaving the factory and troubleshooting during use, significantly improving maintenance efficiency and helping to reduce the simulation cost of the whole vehicle.

[0051] (3) The hardware design adopts automotive-grade power modules and shielded cables to adapt to voltage fluctuations and mechanical vibrations under complex vehicle operating conditions. The test box connects to the vehicle system through a standard interface, supporting rapid deployment and disassembly. Its structural design takes into account the flexibility of fixed installation and handheld operation, ensuring the stable operation and adaptability of the device in different scenarios.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the present invention's conception through the foregoing teachings or related technical or knowledge. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A vehicle-mounted weighing device, characterized in that, include: Pressure data acquisition device (1), vehicle-mounted weighing controller (2), and display (3); The pressure data acquisition device (1) includes multiple suspension embedded pressure sensors (11), each suspension embedded pressure sensor (11) is evenly arranged on the vehicle suspension, and each suspension embedded pressure sensor (11) is electrically connected to the vehicle weighing controller (2) through a shielded cable; the vehicle weighing controller (2) is fixed to the inner wall of the vehicle cab, the display (3) is embedded in the center console of the vehicle, and the vehicle weighing controller (2) and the display (3) are connected through a CAN bus interface; The pressure data acquisition device (1) is used to acquire the pressure data currently borne by the vehicle and send the pressure data to the vehicle weighing controller (2); The vehicle-mounted weighing controller (2) is used to read the pressure data, send the pressure data to an external data platform using an internal communicator, receive the load data returned by the external data platform, and send the load data to the display (3). The display (3) is used to display the load data.

2. The vehicle-mounted weighing device according to claim 1, characterized in that, The plurality of suspension-embedded pressure sensors (11) include: a left front pressure sensor (111), a left center pressure sensor (112), a left rear pressure sensor (113), a right front pressure sensor (114), a right center pressure sensor (115), and a right rear pressure sensor (116); The left front pressure sensor (111) is installed at the left front wheel of the vehicle by means of thread fixation to obtain pressure data at the left front wheel of the vehicle. The left center pressure sensor (112) is installed at the left center wheel of the vehicle by means of thread fixing to obtain pressure data at the left center wheel of the vehicle; The left rear pressure sensor (113) is installed at the left rear wheel of the vehicle by means of thread fixation, so as to obtain the pressure data at the left rear wheel of the vehicle. The right front pressure sensor (114) is installed at the right front wheel of the vehicle by means of thread fixation to obtain pressure data at the right front wheel of the vehicle; The right center pressure sensor (115) is installed at the right center wheel of the vehicle by means of thread fixing to obtain pressure data at the right center wheel of the vehicle; The right rear pressure sensor (116) is installed at the right rear wheel of the vehicle by means of thread fixation to obtain pressure data at the right rear wheel of the vehicle.

3. The vehicle-mounted weighing device according to claim 1, characterized in that, The vehicle-mounted weighing device further includes: a first manual reset button (4); the manual reset button is electrically connected to the plurality of suspension embedded pressure sensors (11) via shielded cables, and is used to force the plurality of suspension embedded pressure sensors (11) to zero.

4. The vehicle-mounted weighing device according to claim 2, characterized in that, The vehicle-mounted weighing device further includes a 220VAC to 24VDC switching power supply, which is used to provide 24VDC voltage to the pressure data acquisition unit (1), the vehicle-mounted weighing controller (2) and the display (3) respectively.

5. The vehicle-mounted weighing device according to claim 1, characterized in that, The vehicle-mounted weighing device also includes: a test box (5); the test box (5) is used to test whether the vehicle-mounted weighing device can work normally; The test box (5) has the following integrated features on its panel: Multiple voltage signal generators (51) are provided, each of which is used to output analog pressure signals at different suspension positions of the vehicle. One voltage signal generator (51) corresponds to one of the multiple suspension embedded pressure sensors (11). The main switch button (52) is used to power on or off the test box (5); The second manual reset button (53) is used to force the output value of the plurality of voltage signal generators (51) to return to zero; The 24V+ and GND interfaces (54) are connected to the test box (5) with banana plugs to provide power to the vehicle weighing controller (2) and the display (3); The CAN_H and CAN_L interfaces (55) are connected to the test box (5) with banana plugs to monitor and debug the CAN bus interface; Terminal block (56) is used to collect the output terminals of multiple voltage signal generators (51), main switch button (52), second manual reset button (53), 24V+ and GND interfaces (54), CAN_H and CAN_L interfaces (55) inside the test box (5) for electrical connection with the vehicle weighing controller (2) and the display (3).

6. The vehicle-mounted weighing device according to claim 5, characterized in that, Each voltage signal generator (51) includes an amplitude adjustment knob (5110) with scale markings and a three-digit LED display (5120) for displaying the output voltage value in real time.

7. The vehicle-mounted weighing device according to claim 6, characterized in that, The amplitude adjustment of each amplitude adjustment knob (5110) is 0.5V~4.5V.

8. The vehicle-mounted weighing device according to claim 5, characterized in that, The vehicle-mounted weighing device further includes: a CAN box (6), which is electrically connected to the CAN_H and CAN_L interfaces (55), the vehicle-mounted weighing controller (2), and the display (3).

9. The vehicle-mounted weighing device according to claim 5, characterized in that, The test box (5) has a threaded hole on the back of its body for fixing the box to a stud on the outside of the vehicle.

10. The vehicle-mounted weighing device according to claim 5, characterized in that, The back of the test box (5) is provided with a non-slip silicone grip groove for hand use.

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