Vehicle-mounted weighing system and method

Abstract

The invention relates to the technical field of automobile weight measurement, in particular to a vehicle-mounted weighing system and method. The system comprises a weighing system controller, and the weighing system controller is electrically connected with an angle sensor system, a display device and an axle load offset calibration device. The method comprises the following steps: collecting a lifting ring angle and a frame angle under different vehicle loads, and sending angle signals to the weighing system controller; calculating according to the angle signal to obtain vehicle weight information; judging whether the vehicle is overloaded according to the vehicle weight information; and if the vehicle is overloaded, displaying and reminding the vehicle weight information and the overload warning information. According to the invention, real-time weight measurement and display can be carried out on the vehicle, offset calibration can also be carried out, the weighing measurement precision is improved, and the overload phenomenon of the truck can be effectively avoided; according to the invention, the required hardware is simple in structure, convenient to install and maintain, high in precision, more convenient to operate and higher in efficiency, and the problems of complex structure and low measurement precision in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile weight measurement, and in particular to a vehicle-mounted weighing system and method. Background Art

[0002] In recent years, there have been frequent problems of overloaded commercial vehicles damaging viaducts and roads. The transportation department has formulated a series of measures to limit user overloading. To address the problem of user overloading, background vehicle load supervision is needed. In the market, not only the transportation department has a demand for vehicle load, but some bulk brands also need background commodity flow control and vehicle load control. For commercial vehicles such as urban garbage trucks and slag trucks, they adopt a profit model of charging by weight. On the vehicle side, more accurate load information is also needed to optimize the AMT shifting strategy and EBS braking strategy.

[0003] All of the above scenarios require vehicle weight information. In the past, they all relied on weighing on a scale, which required a large site to place the weighing equipment. Vehicle weighing needed to be done at a dedicated site, and could only be weighed in batches. The weight of the entire vehicle could not be monitored in real time, and the phenomenon of cargo diversion or overloading of the vehicle could not be avoided. At present, domestic and foreign regulations have gradually put forward the demand for on-board weighing systems, and domestic and foreign commercial vehicle OEMs and related supply chains are also stockpiling on-board weighing technology.

[0004] CN103909858A discloses a self-weighing system for a leaf spring suspension vehicle, which includes a displacement sensor, an electronic control unit and a display screen connected by wires. For a single-axis leaf spring suspension, the displacement sensor is arranged on a leaf spring pressure plate in the middle of the axle; for a balanced suspension, the displacement sensors are respectively arranged at both ends of a single-side leaf spring, and the electronic control unit processes the signals transmitted by each displacement sensor to obtain the total weight of the vehicle after calculation; however, the prior art uses a displacement sensor with limited measurement accuracy.

[0005] CN116358677A discloses a commercial vehicle load measurement method and system based on a rotation angle sensor, including: a data acquisition module, a communication system, a computer controller, an LCD display screen, and a power supply. The data acquisition module is composed of a magnetic guide rail slider mechanism and a measuring device. When the vehicle load changes, the relative displacement change between the leaf spring and the commercial vehicle frame longitudinal beam is converted into an angle change through the data acquisition module installed between the commercial vehicle frame longitudinal beam and the leaf spring, thereby realizing functions such as data transmission, data processing, data display, and overweight warning; however, the measuring device of the prior art has a complex structure and a high manufacturing cost. Summary of the invention

[0006] The purpose of the present invention is to provide a vehicle-mounted weighing system and method, which can measure and display the weight of the vehicle in real time, and can effectively avoid the overloading of the truck. The present invention is easy to install and maintain, has high accuracy, and solves the problems of complex structure and low measurement accuracy in the prior art.

[0007] The present invention provides the following solution

[0008] A vehicle-mounted weighing system comprises a weighing system controller, wherein the weighing system controller is electrically connected to an angle sensor system, a display device and an axle load offset calibration device;

[0009] The angle sensor system is used to collect angle information and send signals to the weighing system controller;

[0010] The weighing system controller is used to receive signals sent by the angle sensor and the axle load offset calibration device, and perform data processing and calculation;

[0011] The display device is used to display the data processed and calculated by the weighing system controller;

[0012] The axle load offset calibration device is used to calibrate the load and write it into the weighing system controller.

[0013] Furthermore, the angle sensor system includes a lifting ring angle sensor and a frame angle sensor, each of the lifting ring angle sensors is arranged on a corresponding leaf spring lifting ring of the vehicle; and the frame angle sensor is arranged on the frame.

[0014] The angle sensor is arranged on the leaf spring eye and the vehicle frame, and is easy to install and operate.

[0015] A vehicle-mounted weighing method, based on the above-mentioned vehicle-mounted weighing system, comprises the following steps:

[0016] S1: collecting the lifting ring angle and frame angle under different vehicle loads, and sending the angle signal to the weighing system controller;

[0017] S2: Calculating vehicle weight information according to the angle signal;

[0018] S3: judging whether the vehicle is overloaded according to the vehicle weight information;

[0019] S4: If overloaded, the vehicle weight information and overload warning information are displayed as a reminder.

[0020] Furthermore, before step S1 or after step S4, if the value of the vehicle weight information exceeds a preset threshold, the axle load of the vehicle is recalibrated according to the axle load offset and written into the weighing system controller.

[0021] Furthermore, step S1 includes measuring the eyelet angle α of the jth leaf spring of the i-th axis. ij , where i = 1, 2, ...; j = 1, 2; measure the frame angle β; and set α ij The angle signals of α and β are sent to the weighing system controller.

[0022] Further, the step S2 includes adjusting the angle of the ring according to the angle of the ring ij and the frame angle β to calculate the relative angle θ between each lifting ring and the vertical line of the frame ij ,θ ij =α ij -β, where i = 1, 2, ...; j = 1, 2;

[0023] According to the relative angle θ ij and the geometric relationship between the frame, the lifting ring and the leaf spring to calculate the arc height of the leaf spring under the current load;

[0024] Calculate the change in the solitary height displacement, where the change in the solitary height displacement is the difference between the arc height of the leaf spring under the current load and the no-load arc height corresponding to each leaf spring when the vehicle is unloaded;

[0025] The leaf spring load is calculated, and the leaf spring load is equal to the product of the leaf spring stiffness and the change in the leaf spring arc height; the leaf spring stiffness and the no-load arc height are preset in the weighing system controller.

[0026] Relative angle θ ij It is a necessary parameter for calculating the change in arc height of a leaf spring. Calculating the load of a leaf spring through the change in arc height of a leaf spring is actually a calculation that converts the deformation of the leaf spring caused by the upper load into the load of the leaf spring.

[0027] Furthermore, the step S2 further includes calculating the no-load weight M corresponding to each leaf spring when the vehicle is unloaded. 0ij And the total no-load mass M0 is preset in the weighing system controller, where M0 = ∑M 0ij , i=1,2,…;j=1,2;

[0028] Calculate the load M of a single leaf spring under the current load ij And the load change ΔM relative to the no-load state ij , ΔM ij =M ij -M 0ij , where i=1,2,…; j=1,2.

[0029] The weighing system controller is preset with parameters such as the no-load arc height of the leaf spring when the vehicle is unloaded, the no-load weight corresponding to the leaf spring, the stiffness of the leaf spring, and the geometric parameters of the leaf spring, the lifting ring and the frame. During weighing, only the angle information needs to be measured, eliminating the no-load calibration process, making operation and calculation simpler and more efficient.

[0030] Furthermore, step S2 also includes calculating the single-axle weight M i , M i =∑M ij , where i = 1, 2, ...; j = 1, 2;

[0031] Calculate the vehicle weight M, M = ∑M i , where i = 1, 2, ...;

[0032] Calculate the cargo weight ΔM, ΔM=M-M0.

[0033] Further, step S3 includes setting the vehicle weight overload limit Ma and the single axle weight overload limit Mb, and setting M, M i Compare with Ma and Mb respectively. If M>Ma, send the vehicle weight overload warning message; if Mi>Mb, send the i-th axle weight overload warning message.

[0034] When the weight of the entire vehicle or a certain axle is overloaded, the weighing system controller sends an overload warning message to remind the monitoring personnel to take timely measures to avoid danger caused by overloading.

[0035] Furthermore, the step S4 includes displaying the weight of each single axle, the weight of the entire vehicle, the weight of the cargo, and an overload warning symbol according to the vehicle weight information and the overload information, and changing the display color of the overloaded axle or the entire vehicle to a warning color.

[0036] The display device displays vehicle weight information for real-time monitoring. When overloaded, it displays an overload alarm symbol and changes the display color of the overloaded part to a warning color, which can quickly and intuitively remind monitoring personnel.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] The present invention utilizes the correlation between the angle change of the leaf spring lifting eye and the frame in the leaf spring suspension system and the vehicle load to measure the vehicle load, and can measure and display the vehicle weight in real time, which can effectively avoid the phenomenon of truck overloading; the hardware structure required by the present invention is simple, low cost, easy to install and maintain, and has high accuracy, and can also perform offset calibration when the difference between the displayed value of the on-board weighing system and the actual weighing value is large due to leaf spring stiffness attenuation or replacement of leaf springs, thereby further ensuring the accuracy of weighing; the present invention presets the vehicle no-load parameters, leaf spring parameters, and suspension system parameters into the weighing system controller, eliminating the no-load calibration process, and the operation is simpler and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Attached Figure 1 This is a schematic diagram of the vehicle-mounted weighing system of the present invention;

[0041] Attached Figure 2 This is a schematic diagram of the distribution of the angle sensor system of the present invention;

[0042] Attached Figure 3 This is a schematic diagram of the installation positions of the lifting ring angle sensor and the frame angle sensor of the present invention;

[0043] Attached Figure 4 This is a schematic diagram of the vehicle-mounted weighing method of the present invention;

[0044] Attached Figure 5 It is a schematic diagram of the calculation principle of the vehicle-mounted weighing method of the present invention;

[0045] Attached Figure 6 A schematic diagram of a display interface of the display device of the present invention;

[0046] Attached Figure 7 This is a schematic diagram of the display interface of the axle load offset calibration device of the present invention.

[0047] In the figure:

[0048] 1- Eyebolt angle sensor, 2- Frame angle sensor. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0050] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0051] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0052] It should be understood that although the terms first, second, third, etc. may be used to describe in the embodiments of the present application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, without departing from the scope of the embodiments of the present application, the first may also be referred to as the second, and similarly, the second may also be referred to as the first.

[0053] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0054] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0055] It should be particularly noted that any symbols and / or numbers in the specification that are not marked in the accompanying drawings are not drawing marks.

[0056] Example 1, please refer to Figure 1 As shown, this embodiment provides a vehicle-mounted weighing system, including a weighing system controller, and the weighing system controller is electrically connected to an angle sensor system, a display device and an axle load offset calibration device.

[0057] Specifically, see Figure 2As shown, the present embodiment is a 4×2 leaf spring vehicle (4 wheels, two-wheel drive), and can also be a vehicle with different numbers of wheels such as 6×2, 8×4, etc. The function of the angle sensor system is to collect angle signals. One is arranged on each leaf spring lifting ring, and a total of 4 lifting ring angle sensors 1 are arranged. A frame angle sensor 2 is also arranged on the frame; one end of the leaf spring lifting ring is pivotally connected to the frame, and the other end is pivotally connected to the leaf spring. The leaf spring lifting ring can rotate around the pivot to adapt to the length change of the leaf spring during the load-bearing process; the weighing system controller is used to collect signals transmitted by the angle sensor and the axle load offset calibration device, etc., and perform data processing and calculation; the display device is used to display the total weight of the vehicle, axle weight, load, overload warning information, etc.; in the case of leaf spring stiffness attenuation or replacement of the leaf spring, when the value displayed by the on-board weighing system is greatly different from the actual weighing, the axle load offset calibration device is used to calibrate the load at each point by itself.

[0058] Specifically, see Figure 3 As shown, the angle sensors installed on the four leaf spring lifting rings are bonded to the outer plane of the leaf spring lifting rings, parallel to the side surfaces of the leaf spring lifting rings, and are used to measure the real-time angle between the line connecting the centers of the two rotating shafts of the lifting rings and the ground; the frame angle sensor 2 is bonded to the outer plane of the frame, perpendicular to the frame, and is used to measure the real-time angle between the vertical line of the frame and the ground.

[0059] See also Figure 4 As shown, this embodiment also provides a vehicle-mounted weighing method, based on the above-mentioned vehicle-mounted weighing system, comprising the following steps:

[0060] S1: collecting the lifting ring angle and frame angle under different vehicle loads, and sending the angle signal to the weighing system controller;

[0061] S2: Calculating vehicle weight information according to the angle signal;

[0062] S3: judging whether the vehicle is overloaded according to the vehicle weight information;

[0063] S4: If overloaded, the vehicle weight information and overload warning information are displayed as a reminder.

[0064] Specifically, the angle signal under different vehicle loads is collected through the angle sensor system, and the angle signal is transmitted to the on-board weighing system controller through hard wires. The angle signal is converted into the displacement change of the leaf spring through the controller operation, and the real-time leaf spring bearing weight is calculated based on the stiffness characteristics of the leaf spring, and then the vehicle bearing weight is calculated. The weighing system controller realizes functions such as data collection, data processing, data storage, and overload judgment, and transmits information such as vehicle axle load weight, vehicle weight, cargo weight, and whether it is overloaded to the display device through CAN signals for display; when the value displayed by the on-board weighing system is significantly different from the actual weighing value measured by the scale due to leaf spring stiffness attenuation or replacement of leaf springs, the axle load offset calibration device can be used to set the current vehicle load at each point, and write it into the controller through CAN signal transmission to achieve offset calibration.

[0065] Specifically, see Figure 5 As shown, the angle sensors installed on the four leaf spring rings are bonded to the outer plane of the leaf spring rings and are parallel to the side of the leaf spring rings. They are used to measure the real-time angle between the center line of the two rotating shafts of the rings and the ground. The ring angle sensor 1 on the jth leaf spring of the i-th axis measures the ring angle α ij In this embodiment, i=1,2; j=1,2; α 11 is the eye angle of the first leaf spring of the first axis, α 12 is the eye angle of the second leaf spring of the first axis, α 21 is the eye angle of the first leaf spring of the second axis, α 22 is the lifting eye angle of the second leaf spring of the second axis; the frame angle sensor 2 is bonded to the outer plane of the frame and is perpendicular to the frame. It is used to measure the real-time angle between the vertical line of the frame and the ground, that is, the frame angle β. The frame angle β not only reflects the posture angle of the whole vehicle when the whole vehicle is in a stationary state, but also reflects the influence of the ground slope and flatness.

[0066] Specifically, see Figure 5 As shown, the weighing system controller converts the frame angle β transmitted by the frame angle sensor 2 and the lifting ring angle α transmitted by each lifting ring angle sensor 1 into ij , which is the relative angle θ between the lifting ring and the vertical line of the frame ij ,θ ij =α ij -β, where α ij is the lifting ring angle measured by the lifting ring angle sensor 1 on the jth leaf spring of the i-th axis; according to the relative angle θ ij Calculate the change in the leaf spring arc height displacement, and then calculate the leaf spring load based on the leaf spring stiffness; that is, through θ ij The initial leaf spring ear center distance can be used to calculate the leaf spring ear center distance at this time, that is, the chord length in the longitudinal direction of the leaf spring, and then the leaf spring arc height under the current load can be calculated.

[0067] Specifically, see Figure 5 As shown, a is the hard point line connecting the front and rear brackets of the leaf spring, and b is the line connecting the centers of the rotating shafts of the lifting rings; γ is the angle between the two straight lines a and b, γ=90°-δ+θ, where δ is the angle between the frame and the side a and is a fixed value, and θ is the relative angle between the lifting ring and the vertical line of the frame. According to the cosine theorem of triangles, the center distance between the front and rear ears of the leaf spring, that is, the chord length L in the longitudinal direction of the leaf spring, can be obtained; and the arc height of the leaf spring can be obtained according to the chord length formula; the arc height of the leaf spring under the current load minus the arc height of the leaf spring under the no-load state is the displacement change of the arc height of the leaf spring under the current load, and the load of the leaf spring can be obtained according to the stiffness of the leaf spring, that is, the load of the leaf spring is equal to the product of the stiffness of the leaf spring and the change of the arc height of the leaf spring. The stiffness of the leaf spring is determined by the material of the leaf spring and is pre-entered into the weighing system controller.

[0068] The weighing system controller pre-enters the arc height of the unloaded leaf spring and the corresponding unloaded weight M. 011 、M 012 、M 021 and M 022 , and the total unloaded mass M0 = ∑M 0ij , where i = 1, 2; j = 1, 2; the weighing system controller can calculate the current load M of a single leaf spring 11 、M 12 、M 21 and M 22 And the load change ΔM relative to the no-load state ij , where ΔM ij =M ij -M 0ij , where i=1,2; j=1,2.

[0069] The weighing system controller can further calculate the single-axle weight M i =∑M ij , where i = 1, 2; j = 1, 2; vehicle weight M = ∑M i , where i = 1, 2; the cargo weight of the vehicle ΔM = M-M0; the overload limit of the vehicle weight and each axle weight is set by the weighing system controller, and M and M i It is compared with the overload limit. If it exceeds the overload limit, the corresponding overload warning message is sent.

[0070] See also Figure 6 As shown, the display device can display the weight of each single axle, the weight of the entire vehicle and the weight of the cargo as well as the overload alarm symbol, and can also change the display color of the overloaded axle or the entire vehicle to a warning color.

[0071] When the value displayed by the on-board weighing system is significantly different from the actual weighing value measured by the scale due to attenuation of leaf spring stiffness or replacement of leaf springs, that is, the difference between the single-axle weight or vehicle weight displayed by the display device and the actual weighing value exceeds the preset threshold, the axle load offset calibration device can be used to set the current load weight at each point of the vehicle, and write it to the controller through CAN signal transmission to realize offset calibration; the actual weighing value is measured by a scale, and the preset threshold can be adjusted according to different vehicle models and different loads. The smaller the preset threshold, the higher the measurement accuracy of the on-board weighing system, but the frequency of offset calibration is also higher. Therefore, the appropriate preset threshold should be selected according to needs.

[0072] See also Figure 7 As shown, the axle load offset calibration device can be a separate device, or it can be integrated with the display device, or it can be integrated with the display device into the large screen of the vehicle. There is a calibration button on the display page. When the calibration button is clicked, two adjustment buttons are added to the front and rear axles to increase and reduce the axle load. When the axle load is adjusted to the required axle load, click the calibration button again to complete the axle load offset calibration; the axle load offset calibration can reduce the influence of leaf spring stiffness attenuation or replacement of leaf springs on the weighing accuracy, and improve the measurement accuracy of the system.

[0073] In addition to displaying weight and overload on the vehicle, the on-board weighing system can also be transmitted to the cloud platform for display and viewing through the big data platform; it can also display the real-time weight and whether it is overloaded on the mobile phone, and monitor the weight at the cargo monitoring center; it can also be transmitted to the traffic management department for weight monitoring; it can also be transmitted to the OEM cloud platform to collect user load information.

[0074] The on-board weighing system and method provided in the present embodiment utilize the correlation between the angle change of the leaf spring lifting eye and the frame in the leaf spring suspension system and the vehicle load to measure the vehicle load, which can measure and display the vehicle weight in real time, and can effectively avoid truck overloading. The hardware structure required by the present invention is simple, and the installation and maintenance are convenient and the accuracy is high. It can also perform offset calibration when the difference between the displayed value of the on-board weighing system and the actual weighing value is large due to leaf spring stiffness attenuation or replacement of leaf springs, thereby further ensuring the accuracy of weighing. The present invention presets the vehicle no-load parameters, leaf spring parameters, and suspension system parameters into the weighing system controller, eliminating the no-load calibration process, and the operation is simpler and more efficient.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle-mounted weighing system, characterized in that: It includes a weighing system controller, which is electrically connected to an angle sensor system, a display device and an axle load offset calibration device; The angle sensor system is used to collect angle information and send signals to the weighing system controller; The weighing system controller is used to receive signals sent by the angle sensor and the axle load offset calibration device, and perform data processing and calculation; The display device is used to display the data processed and calculated by the weighing system controller; The axle load offset calibration device is used to calibrate the load and write it into the weighing system controller.

2. The vehicle-mounted weighing system according to claim 1, characterized in that: The angle sensor system comprises a lifting ring angle sensor (1) and a frame angle sensor (2), each lifting ring angle sensor (1) being arranged on a corresponding leaf spring lifting ring of the vehicle; and the frame angle sensor (2) being arranged on the vehicle frame.

3. A vehicle-mounted weighing method, based on the vehicle-mounted weighing system according to claim 2, comprising the following steps: S1: collecting the lifting ring angle and frame angle under different vehicle loads, and sending the angle signal to the weighing system controller; S2: Calculating vehicle weight information according to the angle signal; S3: judging whether the vehicle is overloaded according to the vehicle weight information; S4: If overloaded, the vehicle weight information and overload warning information are displayed as a reminder.

4. The vehicle-mounted weighing method according to claim 3, characterized in that: The method also includes recalibrating the axle loads of the vehicle according to the axle load offset before step S1 or after step S4, if the value of the vehicle weight information exceeds a preset threshold, and writing the axle loads into the weighing system controller.

5. The vehicle-mounted weighing method according to claim 3, characterized in that: The step S1 includes measuring the angle α of the suspension ring of the jth leaf spring of the i-th axis ij , where i = 1, 2, ...; j = 1, 2; measure the frame angle β; and set α ij The angle signals of α and β are sent to the weighing system controller.

6. The vehicle-mounted weighing method according to claim 5, characterized in that: The step S2 includes determining the angle α of the lifting ring according to the angle of the lifting ring. ij and the frame angle β to calculate the relative angle θ between each lifting ring and the vertical line of the frame ij ,θ ij =α ij -β, where i = 1, 2, ...; j = 1, 2; According to the relative angle θ ij and the geometric relationship between the frame, the lifting ring and the leaf spring to calculate the arc height of the leaf spring under the current load; Calculate the change in the solitary height displacement, where the change in the solitary height displacement is the difference between the arc height of the leaf spring under the current load and the no-load arc height corresponding to each leaf spring when the vehicle is unloaded; Calculating the leaf spring load, the leaf spring load being equal to the product of the leaf spring stiffness and the leaf spring arc height change; The leaf spring stiffness and no-load arc height are preset in the weighing system controller.

7. The vehicle-mounted weighing method according to claim 6, characterized in that: The step S2 also includes calculating the no-load weight M corresponding to each leaf spring when the vehicle is unloaded. 0ij And the total no-load mass M0 is preset in the weighing system controller, where M0 = ∑M 0ij , i=1,2,…;j=1,2; Calculate the load M of a single leaf spring under the current load ij And the load change ΔM relative to the no-load state ij , ΔM ij =M ij -M 0ij , where i=1,2,…; j=1,2.

8. The vehicle-mounted weighing method according to claim 7, characterized in that: The step S2 also includes calculating the single-axle weight M i , M i =∑M ij , where i = 1, 2, ...; j = 1, 2; Calculate the vehicle weight M, M = ∑M i , where i = 1, 2, ...; Calculate the cargo weight ΔM, ΔM=M-M0.

9. The vehicle-mounted weighing method according to claim 8, characterized in that: The step S3 includes setting the vehicle weight overload limit Ma and the single axle weight overload limit Mb. i Compare with Ma and Mb respectively. If M>Ma, send the vehicle weight overload warning message; if Mi>Mb, send the i-th axle weight overload warning message.

10. The vehicle-mounted weighing method according to claim 9, characterized in that: The step S4 includes displaying the weight of each single axle, the weight of the entire vehicle, the weight of the cargo, and an overload warning symbol according to the vehicle weight information and the overload information, and changing the display color of the overloaded axle or the entire vehicle to a warning color.

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