CN212206319U

CN212206319U - Wireless load sensor

Info

Publication number: CN212206319U
Application number: CN202020547998.8U
Authority: CN
Inventors: 刘双春; 陈秋淋; 魏肃; 占章平; 黄志强
Original assignee: Xiamen Chipsun Science and Technology Co Ltd
Current assignee: Xiamen Chipsun Science and Technology Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-12-22
Anticipated expiration: 2030-04-14

Abstract

The utility model relates to a wireless formula load sensor, wireless formula load sensor is used for pasting and fixes on load vehicle's spring steel sheet or axle crossbeam both sides, and it can include MCU module and the low frequency receiving module who is connected with MCU module electricity, high frequency emission module, deformation sensor module and power supply battery, low frequency receiving module is used for receiving the low frequency settlement signal of load host computer, deformation sensor module is used for detecting load vehicle's weight, high frequency emission module be used for with power supply battery voltage with the data transmission that deformation sensor module detected is to the load host computer. The utility model discloses a load sensor structure is simple relatively with the installation, does not weld, does not polish, does not punch, does not damage former car lacquer, need not change vehicle frame or axle, only need with leaf spring working face rust cleaning remove dust, paste good load sensor and carry out communication connection with the load host computer can, very convenient, have very high practicality.

Description

Wireless load sensor

Technical Field

The utility model relates to a vehicle goods technical field that weighs specifically relates to a wireless formula load sensor.

Background

In various countries and regions, the social problems caused by overload of commercial vehicles such as trucks and vans continue to be constant. In addition to causing a short braking distance and a reduction in driving stability, overload may cause damage (collapse, curling) to the road bed, deterioration of road conditions, and the like. In China, overloading of cement trucks, garbage trucks, muck trucks and logistics trucks is more common.

To prevent overload, countries are constantly perfecting regulatory mechanisms by enforcing legal regulations. Taking the automobile big country Germany as an example, a plurality of overload inspection stations are arranged on the highway, and the driver license can be cancelled for more than 3 times of violation in one year. In japan, setting an electronic scale at a highway toll station, installing an automatic measuring device for the weight of a large truck cargo, and the like are also under way.

The truck suspension is a plate spring suspension, the frame is a big frame of a vehicle, the axle is a connecting shaft between two wheels and is positioned at the upper part and the lower part of a vehicle bow plate, and when the vehicle is loaded, the physical quantity changes are as follows: firstly, the spring steel plate deforms; secondly, the distance between the frame and the axle is changed; thirdly, the axle beam deforms. The deformation amount of different load capacities is different, the larger the load capacity of the vehicle is, the larger the deformation amount is, and the smaller the distance between the vehicle frame and the axle beam is.

The vehicle load sensor mainly has two modes, one mode is a distance change detection load sensor, the load sensor is arranged between a vehicle frame and an axle, the distance change quantity in the vertical direction between the vehicle frame and the axle is converted into parameters such as angle quantity, capacitance, inductance quantity, resistance quantity or pressure quantity, the parameters are converted into electric signals through an internal circuit, the electric signals are transmitted to a load host through a special vehicle-mounted cable to carry out data processing, and the vehicle load capacity at different distances between the vehicle frame and the axle is calculated. The load sensor has a complex mechanical structure and high cost; during installation, the frame and the axle beam are required to be subjected to modification treatment such as punching, electric welding and the like; the load sensor is arranged at the bottom of the vehicle, is used in severe environments such as soil, snow water, dust, high and low temperature and the like, and has high requirements on protection levels of mechanical structural parts, electric circuits, connecting wires and the like; the measurement accuracy and the measurement stability of the load sensor are seriously influenced.

Disclosure of Invention

The utility model aims at providing a wireless formula load sensor to solve above-mentioned problem. Therefore, the utility model discloses a specific technical scheme as follows:

the utility model provides a wireless formula load sensor, wireless formula load sensor is used for pasting and fixes on load vehicle's spring steel sheet or axle crossbeam both sides, and it can include MCU module and the low frequency receiving module, high frequency transmitting module, deformation sensor module and the power supply battery who is connected with the MCU module electricity, low frequency receiving module is used for receiving the low frequency settlement signal of load host computer, deformation sensor module is used for detecting load vehicle's weight, high frequency transmitting module be used for with power supply battery voltage with the data transmission that deformation sensor module detected is to the load host computer.

Furthermore, the low-frequency receiving module is arranged in the MCU module.

Further, the MCU module comprises a chip U1 with a model of PIC16F639, the low-frequency receiving module comprises an antenna L1, capacitors C2 and C3 and a diode DIA, the antenna L1 and the capacitor C2 are connected in parallel, one end of the antenna L is connected to an LCX pin of the chip U1, the other end of the antenna L is connected to an LCCOM pin of the chip U1, one end of the capacitor C3 and the cathode of the diode DIA, the anode of the diode DIA is connected to VCC, and the other end of the capacitor C3 is grounded.

Further, the low-frequency receiving module is a 125KHZ low-frequency receiving module.

Further, the high-frequency transmitting module comprises an ASK/FSK transmitting driving integrated circuit chip U3, a crystal oscillator XT1, an internal high-frequency transmitting antenna L3 and capacitors C10, C11, C12 and C14, and U3 transmits a 433.92MHz frequency modulation FSK high-frequency signal through the antenna L3.

Further, the deformation sensor module can adopt a resistance strain gauge, a 3D accelerometer sensor or a grating deformation sensor and the like.

The utility model adopts the above technical scheme, the beneficial effect who has is: the utility model discloses a load sensor structure is simple relatively with the installation, does not weld, does not polish, does not punch, does not damage former car lacquer, need not change vehicle frame or axle, only need with leaf spring working face rust cleaning remove dust, paste good load sensor and carry out communication connection with the load host computer can, very convenient, have very high practicality.

Drawings

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

Fig. 1 is a schematic block diagram of a wireless load sensor of the present invention;

fig. 2 is a circuit diagram of the wireless load sensor shown in fig. 1.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1 and 2, a wireless load sensor is used for being stuck and fixed on a spring steel plate of a load-carrying vehicle or on two sides of a vehicle axle beam, and comprises an MCU module 1, and a low-frequency receiving module 2, a high-frequency transmitting module 3, a deformation sensor module 4 and a power supply battery 5 which are electrically connected with the MCU module 1. The power supply battery 5 can adopt a 3v button battery with the same volume as a small battery so as to reduce the volume of the whole wireless load sensor. Each block will be described below.

MCU module 1: the MCU module 1 includes a chip U1, which selects a microchip PIC16F639 and programs dedicated control software. The MCU has a built-in 125KHZ low-frequency receiving module 2, has functions of dormancy awakening and power supply low-voltage detection, and each load sensor is provided with a unique serial number. When the signal transmission works, the MCU reads the detection data of the deformation sensor module 4, generates high-frequency transmission data and controls the high-frequency transmission module to transmit high-frequency signals. And during dormancy, the deformation sensor module 4 and the high-frequency transmitting module 3 are controlled to enter a dormant state, so that the power consumption of the load sensor is reduced, and the service life is prolonged.

The low-frequency receiving module 2: the low frequency receiving module 2 is composed of a chip U1 of the MCU, an antenna L1, capacitors C2, C3 and a diode D1A, and is used for receiving a 125KHZ low frequency setting signal of an external load host. The antenna L1 is connected in parallel with the capacitor C2, one end of the antenna is connected to the LCX pin of the chip U1, the other end of the antenna is connected to the LCCOM pin of the chip U1, the capacitor C3 and the cathode of the diode DIA, the anode of the diode DIA is connected to VCC, and the capacitor C3 is grounded. The external low-frequency setting signal can enable the load sensor to enter the dormancy state, awaken the dormant load sensor to enter the working state, trigger the load sensor to transmit information such as a load sensor serial number and the like, match the information with the load host machine and enable the load host machine to accurately position the mounting position of the load sensor. It should be understood that the low frequency receiving module 2 may also be external.

High-frequency transmission module 3: the high-frequency transmitting module 3 is composed of an ASK/FSK transmitting drive integrated circuit chip U3, a crystal oscillator XT1, and internal high-frequency transmitting antennas L3, C10, C11, C12, C14, etc., as detailed in fig. 2. When the U3 receives the enable signal of the MCU module 1 and the data to be transmitted, the antenna transmits a high-frequency signal of 433.92MHz FM-modulated FSK. The transmission data includes a load sensor serial number, battery low voltage abnormality information, data detected by a sensor, and the like. The special high-frequency emission drive IC is adopted in the embodiment, the high-frequency emission power can be effectively improved during emission, and the emission drive IC can be turned off to enable the IC to enter a dormant state when the emission is stopped, so that the current of the load sensor is reduced, and the service life is prolonged.

Deformation sensor module 4: the deformation detection of the vehicle spring steel plate and the front and rear axle beams can adopt a resistance strain gauge, a 3D accelerometer sensor or a grating deformation sensor and the like. In the embodiment, a 3D accelerometer sensor is selected, and the MCU module 1 reads the static gravity value detected by the 3D accelerometer sensor U2 and transmits the static gravity value to the load host via the high frequency transmitting module 3.

The wireless load sensor can be adhered and fixed on the spring steel plate or two sides of the axle beam on the premise of not changing the original structure of the vehicle and not influencing the safety of the vehicle, the deformation of the spring steel plate or the axle beam when the vehicle is loaded is detected in real time, the detection result is transmitted through a high-frequency wireless signal, and the high-frequency wireless signal is received, decoded and operated by the load host to calculate the load capacity of the vehicle. The product simple structure has with low costs, the installation is fast, stability is strong etc. and is showing the advantage, specifically as follows:

1. the load sensor is powered by an internal battery, and the load detection result is wirelessly transmitted by a high-frequency signal, so that a special automobile cable is omitted.

2. The installation is simple and convenient, and the load sensor bottom surface is pasted on vehicle spring steel plate or front and back axle crossbeam with powerful 3M glue, and reuse joint sealing glue is with the sensor package on crossbeam or spring steel plate, need not change vehicle frame or axle, does not weld, does not polish, does not punch, does not damage former car lacquer.

3. Can achieve complete dust and water prevention, and can be used for logistics vehicles, freight transport vehicles, muck vehicles, sanitation vehicles, container vehicles and the like with poor vehicle conditions for a long time.

4. The problems that after the product is installed, the product cannot adapt to high and low temperature environments or is loosened and falls off due to long-time application, so that the deformation detection error is large and the service life is short can be solved.

5. Effectively reducing the cost and enhancing the applicability and competitiveness of the product.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a wireless load sensor, its characterized in that, wireless load sensor is used for pasting to fix on load vehicle's spring steel sheet or axle crossbeam both sides, and it includes MCU module and the low frequency receiving module, high frequency transmitting module, deformation sensor module and the power supply battery who is connected with MCU module electricity, low frequency receiving module is used for receiving the low frequency settlement signal of load host computer, deformation sensor module is used for detecting load vehicle's weight, high frequency transmitting module be used for with power supply battery voltage with the data transmission that deformation sensor module detected is to the load host computer.

2. The wireless load sensor of claim 1, wherein the low frequency receiving module is built into the MCU module.

3. The wireless load sensor according to claim 2, wherein the MCU module comprises a chip U1 with model number PIC16F639, the low frequency receiving module comprises an antenna L1, capacitors C2 and C3, and a diode DIA, the antenna L1 is connected in parallel with the capacitor C2, one end is connected to the LCX pin of the chip U1, the other end is connected to the LCCOM pin of the chip U1, one end of the capacitor C3 and the cathode of the diode DIA, the anode of the diode DIA is connected to VCC, and the other end of the capacitor C3 is grounded.

4. The wireless load sensor according to claim 2 or 3, wherein the low frequency receiving module is a 125KHZ low frequency receiving module.

5. The wireless load sensor according to claim 1, wherein the high frequency transmitting module comprises an ASK/FSK transmitting driving integrated circuit chip U3, a crystal oscillator XT1, an internal high frequency transmitting antenna L3 and capacitors C10, C11, C12 and C14, and U3 transmits a 433.92MHZ frequency modulation FSK modulated high frequency signal through an antenna L3.

6. The wireless load sensor of claim 1, wherein the deformation sensor module employs a resistive strain gauge, a 3D accelerometer sensor, or a grating deformation sensor.