CN213301436U

CN213301436U - Semi-trailer vehicle-mounted weighing system

Info

Publication number: CN213301436U
Application number: CN202021121621.2U
Authority: CN
Inventors: 付宏勋; 刚宪约
Original assignee: Shandong University of Technology
Current assignee: Shandong University of Technology
Priority date: 2020-06-17
Filing date: 2020-06-17
Publication date: 2021-05-28
Anticipated expiration: 2030-06-17

Abstract

The utility model provides a semitrailer vehicle-mounted weighing system relates to the vehicle-mounted weighing system field. The method mainly comprises the following steps: the device comprises a strain measurement module, a transmitting module, a data transmission module, a data processing module, a display module and a power supply module. The strain measurement module adopts a strain sensor and is arranged at the bottom of a longitudinal beam of a frame of the semitrailer; the transmitting module is connected with the strain sensor through a circuit, receives the analog signal transmitted by the strain sensor and converts the analog signal into a digital signal to be output; the data transmission module adopts a CAN bus communication mode; the data processing module is used for receiving the digital signals output by the transmitting module and calculating and outputting weight information born by the vehicle. On-vehicle weighing system of semitrailer effectively utilizes the accurate load condition of measuring vehicle of meeting an emergency of frame atress deformation production, the measurement module that meets an emergency is installed in frame both sides I-beam bottom, and the measuring result need not reequip the vehicle when accurate and installation, the later maintenance of being convenient for.

Description

Semi-trailer vehicle-mounted weighing system

Technical Field

The utility model relates to the technical field of vehicles, especially, relate to an on-vehicle weighing system of semitrailer.

Background

With the continuous development of the automobile industry and the rapid rise of the logistics industry in China, the transportation industry develops abnormally rapidly, the number of trucks is increased rapidly, the bearing capacity is increased more and more, and the overload phenomenon is forbidden frequently in order to pursue the maximization of benefits. The vehicle overload problem is one of the major problems troubling traffic safety, and according to statistics, 70% of road safety accidents are caused by vehicle overload. In addition, the damage of the overload of the vehicle to the road surface and the bridge is very serious, which causes huge economic loss and resource waste.

Traditional mode of weighing relies on the weighbridge fixed point to weigh, and cargo vehicle need drive specific position, measures under quiescent condition, consumes time for a long time, and work efficiency is low, can not satisfy the demand of modernized transportation trade already. At present, the dynamic weighing technology is developed quickly aiming at the weighing problem, the dynamic weighing technology is generally applied to highway toll stations, the non-stop measurement can be realized, the measurement efficiency and the accuracy are high, but the dynamic weighing technology is still influenced by the limitation of fixed-point detection, and the dynamic weighing technology is less applied to common roads and bridges and cannot solve the problem of weighing more widely.

In order to solve the weighing problem and avoid the defects of the traditional weighing mode, a vehicle-mounted weighing system is developed and utilized gradually, a weighing device is arranged on a vehicle body of the system, the bearing condition of the vehicle can be detected in real time, and a driver can obtain weighing information through a vehicle-mounted terminal in real time. In addition, by using the current advanced remote wireless communication and positioning technology, the company to which the vehicle belongs can monitor and manage the vehicle working outside in real time, acquire the load and position information of the vehicle at any time, and have great help for standardizing the behavior of the driver, avoiding unnecessary risks and improving the working efficiency. However, since the technology of the vehicle-mounted weighing system is not mature enough, and each component of the system is easily interfered by various factors, such as temperature, sensor installation position and the like, the vehicle-mounted weighing system needs to be further optimized.

Disclosure of Invention

To the problem mentioned above, the utility model provides an on-vehicle weighing system of semitrailer when realizing freely weighing, has promoted measuring accuracy.

The utility model discloses a semi-trailer vehicle-mounted weighing system, which comprises six components of a strain measurement module, a transmitting module, a data transmission module, a data processing module, a display module and a power supply module; the strain measurement module adopts a strain sensor, the resistance value of the strain measurement module changes along with the bearing deformation of the frame and outputs a corresponding voltage analog signal, and the strain measurement module adopts a high-precision full-bridge strain gauge with temperature self-compensation; the transmitting module is connected with the strain measuring module through a circuit, receives the analog signal transmitted by the strain measuring module, adopts a special weighing measurement digital-to-analog conversion module, can provide relatively stable excitation voltage, and can amplify and convert the analog signal transmitted by the strain measuring module; the data transmission module adopts a CAN bus communication mode and is connected with a single chip microcomputer comprising each strain sensor, a CAN transceiver, two differential signal lines and a master control single chip microcomputer for receiving data, and the master control single chip microcomputer for receiving the data encodes a message and transmits the message to the two buses by differential signals; the communication mode adopting the CAN bus has the advantages of good anti-interference performance, small wiring harness number and easiness in error detection; the data processing module adopts an STM32 single chip microcomputer, the single chip microcomputer CAN receive and decode data to realize data processing, a temperature compensation algorithm and CAN bus data receiving and sending, the single chip microcomputer CAN meet the design requirements of high performance, low cost and low power consumption, the data processing module CAN analyze and calculate the data measured at two sides of the frame to judge whether the load in the vehicle is uniformly loaded, if the difference value of the values measured by the strain sensors at the two sides is larger, the vehicle-mounted alarm CAN be triggered to remind a driver to take measures in time, and the occurrence of an unbalanced load working condition is avoided; the display module is connected with the data processing module, receives the calculation result of the data processing module and displays the finally measured weight value.

The strain measurement module adopts a high-precision full-bridge strain gauge with temperature self-compensation, saves the step of bridge combination compared with a single-shaft strain gauge, and has the temperature interference resistance; the resistance value of the strain gauge is 350 +/-5% omega, the sensitivity coefficient is 2.11 +/-1%, the strain limit is 2%, and the applicable temperature range is-30 to +80 ℃.

The strain measurement modules are symmetrically arranged at the bottom of a longitudinal beam of a frame of the semitrailer, and 4 strain measurement modules are arranged on each side of the longitudinal beam; the strain measurement module is installed without disassembling and assembling the vehicle, and is convenient to install and maintain.

The power module is connected with the vehicle-mounted cigarette lighter socket, adopts a low-dropout linear voltage stabilization chip, provides 5V and 3.3V low-ripple direct-current voltage, and drives the variable measurement module 1, the transmission module 2, the data transmission module 3, the data processing module 4 and the display module 5.

The semi-trailer vehicle-mounted weighing system is also provided with a GPS (global positioning system), a wireless communication module and an audible and visual alarm, so that weighing information and vehicle positions can be immediately transmitted to a driver and a background control center which are not in the vehicle, a user can check detection information in real time by using a mobile phone client, and if the load of the vehicle is suddenly reduced in an unconventional time period, the audible and visual alarm is triggered to remind the driver to take corresponding protective measures in time.

To sum up, the beneficial effects of the utility model are that:

(1) the utility model discloses a current vehicle-mounted weighing system is compared to vehicle-mounted weighing system, and at first the weighing result is more accurate, receives external environment factor to influence for a short time.

(2) The utility model discloses a whether on-vehicle weighing system can detect the vehicle and carry partially, avoids producing dangerous operating mode.

(3) The utility model discloses a vehicle-mounted weighing system can realize overload warning, unconventional weightlessness warning and GPS locate function.

(4) The utility model discloses an on-vehicle weighing system weighing sensor installs in frame both sides I-beam bottom, need not reequip the vehicle when measuring result is accurate and install, the later maintenance of being convenient for.

Drawings

FIG. 1 is a schematic view of the structural composition of the vehicle-mounted weighing system of the present invention;

FIG. 2 is a schematic diagram of the distribution of strain measurement modules of the present invention;

fig. 3 is the utility model discloses on-vehicle weighing system work flow chart.

Detailed Description

The utility model discloses a vehicle-mounted weighing system is further explained through the embodiment below.

As shown in figure 1, on-vehicle weighing system of semitrailer, including six component parts of measurement of strain module 1, transmission module 2, data processing module 3, data transmission module 4, display module 5 and power module 6. The strain measurement module 1 adopts a strain sensor, when an automobile frame is deformed by a load to generate strain, the strain measurement module 1 is correspondingly deformed, the resistance value of the strain measurement module is changed, and a corresponding voltage analog signal is output; the strain measurement module 1 adopts a high-precision full-bridge strain gauge with temperature self-compensation, saves the step of bridge combination compared with a single-shaft strain gauge, is easy to paste and fix, has temperature interference resistance, and obviously improves the detection accuracy.

As shown in fig. 1, the transmitting module 2 is connected to the strain measuring module 1 through a circuit, the transmitting module 2 receives the analog signal transmitted from the strain measuring module 1, amplifies and converts the analog signal, and the transmitting module 2 adopts a module dedicated to digital-to-analog conversion for weighing measurement, so that a relatively stable excitation voltage can be provided, and the accuracy of the measurement result can be further ensured.

The data transmission module 3 adopts a CAN bus communication mode, and comprises a single chip microcomputer, a CAN transceiver, two differential signal lines and a master control single chip microcomputer which are connected with each strain sensor, wherein the master control single chip microcomputer which receives data encodes messages and transmits the messages to the two buses in a differential signal mode.

And the data transmission module 3 transmits the digital signals output by the processing of the transmitting module 2 to the data processing module 4.

The data processing module 4 adopts an STM32 singlechip, and mainly receives and decodes data to realize data processing, temperature compensation algorithm and CAN bus data transceiving. STM32 singlechip can satisfy the design requirement of high performance, low cost, low-power consumption, can carry out real-time processing to the weight information that transmits and calculate and obtain final weight value to give display module 5 with weight value transmission. If the difference value of the detection values of the variable measurement modules on the two sides of the frame is large in the data calculation and processing process, the alarm indicator lamp is lightened to remind a driver of uneven loading of cargoes, corresponding measures are taken timely, the influence on the accuracy of a weighing result is avoided, and meanwhile dangerous working conditions such as rollover and the like are effectively avoided in the vehicle running process.

The display module 5 is directly connected with the data processing module 4, receives the calculation result of the data processing module, and displays the finally measured weight value.

The power supply module 6 is connected with the vehicle-mounted cigarette lighter socket and provides power for the whole system, the power supply module 6 adopts a low-dropout linear voltage stabilization chip and provides low ripple direct current voltage of 5V and 3.3V, and the variable measurement module 1, the transmission module 2, the data transmission module 3, the data processing module 4 and the display module 5 can be stably driven.

The semi-trailer vehicle-mounted weighing system is also provided with a GPS (global positioning system) 7, a wireless communication module 8 and an audible and visual alarm 9, so that weighing information and vehicle positions can be immediately transmitted to a driver and a background control center which are not in the vehicle, a user can check detection information in real time by using a mobile phone client, if the load of the vehicle is suddenly reduced in an unconventional time period, the vehicle-mounted alarm can be triggered to remind the driver to take corresponding protective measures in time, and unnecessary economic loss is avoided.

As shown in figure 2, the strain measurement modules are symmetrically arranged at the bottom of the longitudinal beam of the semitrailer frame, 4 strain measurement modules are arranged on each side of the longitudinal beam, the semitrailer frame does not need to be disassembled and assembled during installation, and the semitrailer frame is convenient to install and maintain.

As shown in fig. 3, the power supply module provides voltage, the system starts to work, the strain measurement module starts to detect strain changes of the chassis after the system is initialized, and sends measurement data to the transmission module, the transmission module converts analog signals from the strain measurement module into digital signals, at this time, one measurement is finished, and the system performs multiple acquisition according to time node cycle. After the conversion of the transmitting module is completed, the digital signal is sent to the data processing module by the data transmission module, the data processing module completes the calculation of the data and sends the calculation result to the display module for display, and if the measured weight or the measured inclination angle is larger than a limit value, the audible and visual alarm can give an alarm to remind a driver.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A semi-trailer vehicle-mounted weighing system is characterized by mainly comprising six components of a strain measurement module (1), a transmitting module (2), a data transmission module (3), a data processing module (4), a display module (5) and a power supply module (6); the strain measurement module (1) adopts a strain sensor, the resistance value of the strain measurement module changes along with the bearing deformation of the frame and outputs a corresponding voltage analog signal, and the strain measurement module (1) adopts a high-precision full-bridge strain gauge with temperature self-compensation; the strain measuring device comprises a strain measuring module (1), a transmitting module (2), a weighing measuring digital-to-analog conversion special module, a power supply module and a power supply module, wherein the strain measuring module (1) is connected with the transmitting module (2) through a circuit, the transmitting module (2) receives analog signals transmitted by the strain measuring module (1), the weighing measuring digital-to-analog conversion special module is adopted by the transmitting module (2), stable excitation voltage can be provided, and the analog signals transmitted by; the data transmission module (3) adopts a CAN bus communication mode, is connected with the single chip microcomputer of each strain sensor, the CAN transceiver, the two differential signal lines and the master control single chip microcomputer for receiving data, and the master control single chip microcomputer for receiving data encodes messages and transmits the messages to the two buses by differential signals; the data processing module (4) adopts an STM32 single chip microcomputer, the single chip microcomputer CAN receive and decode data to realize data processing, a temperature compensation algorithm and CAN bus data receiving and transmitting, and the data processing module (4) CAN analyze and calculate data measured by strain sensors on two sides of the frame, judge whether the vehicle is uniformly loaded and avoid the occurrence of an unbalance loading working condition; and the display module (5) is connected with the data processing module (4), receives the calculation result of the data processing module (4), and displays the finally measured weight value.

2. The semi-trailer on-board weighing system according to claim 1, characterized in that the strain measuring modules (1) are arranged symmetrically at the bottom of the longitudinal beam of the semi-trailer frame, 4 on each side.

3. The semi-trailer vehicle-mounted weighing system according to claim 1, characterized in that the power supply module (6) is connected with a vehicle-mounted cigarette lighter socket, the power supply module (6) adopts a low-dropout linear voltage-stabilizing chip to provide low-ripple direct-current voltages of 5V and 3.3V to drive the variable measurement module (1), the transmission module (2), the data transmission module (3), the data processing module (4) and the display module (5).

4. The semi-trailer vehicle-mounted weighing system according to claim 1, characterized in that the semi-trailer vehicle-mounted weighing system is also provided with a GPS (global positioning system) 7, a wireless communication module 8 and a sound and light alarm (9), weighing information and vehicle positions can be transmitted to a driver and a background control center which are not in the vehicle in real time, a user can check detection information in real time by using a mobile phone client, and if the vehicle suddenly reduces the load in an unconventional time period, the sound and light alarm (9) can be triggered to remind the driver in time.