Road traffic information acquisition device

Abstract

The utility model relates to a road traffic information acquisition device, which is buried on the surface of a road and comprises a piezoelectric power generation monitoring module, a signal acquisition module, an energy storage module and a wireless transmitting module, the piezoelectric power generation monitoring module converts mechanical force generated when a vehicle runs on a road into a current signal and a voltage signal through a piezoelectric plate. The signal acquisition module is used for acquiring a voltage signal, recording time for generating a peak value of the voltage signal, and transmitting the voltage signal and the time for generating the peak value of the voltage signal to the wireless transmitting module; the energy storage module is used for acquiring and storing current signals and supplying power to the signal acquisition module and the wireless transmitting module; the wireless transmitting module transmits the voltage signal and the time for generating the peak value of the voltage signal to an external data processing terminal in a wireless communication mode. The road traffic information acquisition device does not need an external power supply, so that the cost is reduced, and the maintenance burden of a lot of equipment and the use burden of a sensor network are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of highway traffic, and in particular relates to a highway traffic information collection device. Background Art

[0002] With the development of smart transportation technology, the level of highway intelligence and traffic capacity are constantly improving. Smart transportation technology mainly relies on all-round road traffic information perception, and road intelligent sensing is an important component of road traffic information perception. At present, the acquisition of smart transportation technology data mainly relies on the information collection of roadside external facilities, such as radar, images, etc., and lacks effective means of real-time perception of road information.

[0003] Existing methods of acquiring road information mostly use sensors buried inside the road surface. Currently, embedded sensors generally need to be powered by very long power cords, or a built-in power supply is provided for the embedded sensors. Once the power supply is exhausted, new sensors need to be re-buried or the sensors need to be removed to replace the power supply, which greatly increases the maintenance cost of the embedded sensors and also limits the application of embedded sensors. Utility Model Content

[0004] In order to solve the above problems existing in the prior art, the utility model provides a highway traffic information collection device. The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0005] The utility model provides a highway traffic information collection device, which is buried on the road surface and includes: a piezoelectric power generation monitoring module, a signal collection module, an energy storage module and a wireless transmission module, wherein:

[0006] The piezoelectric power generation monitoring module is respectively connected to the signal acquisition module and the energy storage module; the energy storage module is respectively connected to the signal acquisition module and the wireless transmission module; the wireless transmission module is connected to the signal acquisition module;

[0007] The piezoelectric power generation monitoring module converts the mechanical force generated by the vehicle when it is driving on the road into a current signal and a voltage signal using a piezoelectric sheet;

[0008] The signal acquisition module is used to collect the voltage signal, record the time when the peak value of the voltage signal is generated, and transmit the voltage signal and the time when the peak value of the voltage signal is generated to the wireless transmission module;

[0009] The energy storage module is used to collect and store the current signal and to supply power to the signal collection module and the wireless transmission module;

[0010] The wireless transmitting module transmits the voltage signal and the time when the peak value of the voltage signal is generated to an external data processing terminal in a wireless communication manner.

[0011] In one embodiment of the utility model, the piezoelectric power generation monitoring module includes two piezoelectric sheet assembly components arranged in sequence along the track of the vehicle tire on the road;

[0012] The piezoelectric sheet assembly component comprises a buffer layer arranged on a road base layer, a plurality of piezoelectric sheets are arranged on the buffer layer, and an asphalt layer of the road is located above the plurality of piezoelectric sheets;

[0013] Among the plurality of piezoelectric sheets, some piezoelectric sheets are connected to the signal acquisition module as piezoelectric detection components, and the remaining piezoelectric sheets are connected to the energy storage module as piezoelectric energy capture components.

[0014] In one embodiment of the present invention, the distance between the two piezoelectric sheet assembly components is smaller than the distance between the front and rear wheels of the vehicle.

[0015] In one embodiment of the present invention, the plurality of piezoelectric sheets are separated from the asphalt layer by an intermediate layer of foam or rubber material.

[0016] In one embodiment of the present invention, the buffer layer has protrusions corresponding to the positions of the plurality of piezoelectric sheets, and the piezoelectric sheets cover the corresponding protrusions on the buffer layer.

[0017] In one embodiment of the present invention, the protrusion is hemispherical.

[0018] In one embodiment of the present invention, the signal acquisition module is a single chip microcomputer.

[0019] In one embodiment of the utility model, the energy storage module includes a rectifier power supply circuit and an energy storage device;

[0020] The rectifier power supply circuit comprises a first diode, a second diode, a third diode, a fourth diode, and a first capacitor, wherein the anode of the first diode is respectively connected to the anode of the third diode and the lower plate of the first capacitor; the cathode of the first diode is connected to the anode of the second diode; the cathode of the third diode is connected to the anode of the fourth diode; the cathode of the second diode is respectively connected to the cathode of the fourth diode and the upper plate of the first capacitor; the anode of the second diode and the anode of the fourth diode serve as input ends of the rectifier power supply circuit, and the upper and lower plates of the first capacitor serve as output ends of the rectifier power supply circuit;

[0021] The energy storage device is connected to the output end of the rectifier power supply circuit.

[0022] In one embodiment of the present invention, the energy storage device is a supercapacitor.

[0023] In one embodiment of the present invention, the wireless transmission module is a ZigBee communication module.

[0024] Compared with the prior art, the beneficial effects of the utility model are:

[0025] The highway traffic information collection device of the utility model utilizes a piezoelectric power generation monitoring module to convert the mechanical force generated by a vehicle when traveling on the road into current signals and voltage signals. By collecting and storing the current signals, a stable power supply source can be provided for the entire device. Therefore, no external power supply is required, which reduces costs and reduces a lot of equipment maintenance and sensor network usage burdens.

[0026] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural block diagram of a highway traffic information collection device provided by an embodiment of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a piezoelectric sheet assembly component provided by an embodiment of the utility model;

[0029] Figure 3 This is a schematic diagram of the installation of a piezoelectric sheet provided by an embodiment of the utility model;

[0030] Figure 4 It is a circuit diagram of an energy storage module provided by an embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of a highway traffic information collection device provided by an embodiment of the utility model for collecting information to obtain vehicle speed.

[0032] Icons: 1-piezoelectric power generation monitoring module; 11-piezoelectric sheet assembly; 111-buffer layer; 112-piezoelectric sheet; 113-nail; 2-signal acquisition module; 3-energy storage module; 31-rectifier power supply circuit; 32-energy storage device; 4-wireless transmission module; 5-road base layer; 6-asphalt layer; 7-data processing terminal; 8-middle layer. DETAILED DESCRIPTION

[0033] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the present invention, a highway traffic information collection device proposed according to the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] The above and other technical contents, features and effects of the utility model are clearly presented in the following detailed description of the specific implementation mode in conjunction with the accompanying drawings. Through the description of the specific implementation mode, the technical means and effects adopted by the utility model to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation, and are not used to limit the technical solution of the utility model.

[0035] The embodiment of the utility model provides a highway traffic information collection device, which is buried on the road surface. Figure 1 , Figure 1 is a structural block diagram of a highway traffic information collection device provided by an embodiment of the utility model, such as Figure 1 As shown, the highway traffic information collection device of this embodiment includes a piezoelectric power generation monitoring module 1, a signal collection module 2, an energy storage module 3 and a wireless transmission module 4.

[0036] Among them, the piezoelectric power generation monitoring module 1 is connected to the signal acquisition module 2 and the energy storage module 3 respectively; the energy storage module 3 is connected to the signal acquisition module 2 and the wireless transmission module 4 respectively; and the wireless transmission module 4 is connected to the signal acquisition module 2.

[0037] In this embodiment, the piezoelectric power generation monitoring module 1 uses a piezoelectric sheet to convert the mechanical force generated when the vehicle is driving on the road into a current signal and a voltage signal. The mechanical force can be the vibration force generated when the vehicle passes the piezoelectric power generation monitoring module 1 on the road surface or the mechanical force such as the airflow pressure generated by the vehicle passing by. The signal acquisition module 2 is used to collect voltage signals, record the time when the peak value of the voltage signal is generated, and transmit the voltage signal and the time when the peak value of the voltage signal is generated to the wireless transmission module 4. The energy storage module 3 is used to collect and store current signals and to power the signal acquisition module 2 and the wireless transmission module 4. The wireless transmission module 4 sends the voltage signal and the time when the peak value of the voltage signal is generated to the external data processing terminal 7 in a wireless communication manner. The data processing terminal 7 obtains the speed of the vehicle and the traffic volume on the highway based on the received voltage signal and the time when the peak value of the voltage signal is generated.

[0038] Optionally, the piezoelectric power generation monitoring module 1 includes two piezoelectric sheet assembly components 11, which are arranged in sequence along the track of vehicle tires on the road, and the distance between the two piezoelectric sheet assembly components 11 is smaller than the distance between the front and rear wheels of the vehicle.

[0039] See also Figure 2 , Figure 2 Schematic diagram of the structure of a piezoelectric sheet assembly provided by an embodiment of the utility model. Figure 2 As shown, the piezoelectric sheet assembly component 11 includes a buffer layer 111 arranged on the road base layer 5, and a plurality of piezoelectric sheets 112 are arranged on the buffer layer 111, and above the plurality of piezoelectric sheets 112 is the asphalt layer 6 of the road; wherein, among the plurality of piezoelectric sheets 112, some of the piezoelectric sheets are connected to the signal acquisition module 2 as piezoelectric detection components, and the remaining piezoelectric sheets are connected to the energy storage module 3 as piezoelectric energy capture components.

[0040] Exemplarily, a plurality of piezoelectric sheets 112 arranged in a 3*3 array are provided on the buffer layer 111, and the piezoelectric sheet 112 at the center position is connected to the signal acquisition module 2 as a piezoelectric detection component; the eight piezoelectric sheets 112 surrounding the piezoelectric sheet 112 at the center position are connected to the energy storage module 3 as piezoelectric energy capture components.

[0041] In an optional embodiment, the piezoelectric sheet 112 and the asphalt layer 6 may be separated by an intermediate layer 8 of foam or rubber material. The intermediate layer 8 can prevent the piezoelectric sheet assembly 11 from being affected when laying asphalt.

[0042] Optionally, the buffer layer 111 has protrusions corresponding to the positions of the plurality of piezoelectric sheets 112, and the piezoelectric sheets 112 cover the corresponding protrusions on the buffer layer 111. Exemplarily, the plurality of protrusions on the buffer layer 111 may be hemispherical.

[0043] See also Figure 3 , Figure 3 It is a schematic diagram of the installation of a piezoelectric sheet provided by an embodiment of the utility model. In this embodiment, a cylindrical pit with a diameter of about 20 mm and a depth of about 15 mm can be dug on the roadbed 5, and a buffer layer 111 composed of a rubber block or spring with a certain elasticity is placed in the pit. A hemispherical protrusion with a radius of about 10 mm is exposed at the upper end. The two together constitute an elastomer. The elastic coefficient of the buffer layer 111 is generally 550-650 N / mm. The piezoelectric sheet 112 is placed close to the protrusion in a certain arc or bow shape, and the two ends of the piezoelectric sheet 112 can be fixed by nails 113.

[0044] Optionally, the buffer layer 111 may be composed of an elastic body consisting of a plurality of separate cylindrical and hemispherical protrusions, or may be composed of an elastic body consisting of a plurality of cylindrical and hemispherical protrusions connected to each other.

[0045] In this embodiment, when the piezoelectric sheet 112 is acted upon by an external force, i.e., a mechanical force such as a vibration force generated when a vehicle passes the piezoelectric sheet assembly 11 on the road surface or an air flow pressure generated when a vehicle passes by, the piezoelectric sheet 112 will be nearly flat against the roadbed 5, and the elastic body will shrink into the gap of the roadbed 5 due to deformation. When the external force is removed, i.e., when the vehicle leaves the piezoelectric sheet assembly 11, the elastic body returns to its original state, and the piezoelectric sheet 112 returns to its original state under the action of the elastic body.

[0046] During the entire process described above, the piezoelectric sheet 112 will deform, and a corresponding piezoelectric field will be generated inside due to the strain. Due to the effect of induced charge, this piezoelectric field will cause a potential difference to be generated on the upper and lower electrode surfaces of the piezoelectric sheet 112, and this potential difference will in turn drive the electrons in the external circuit to flow from one electrode to the other electrode, thereby forming a current until the electrons accumulated on the electrodes reach a balance with the piezoelectric field; and when the external stress is unloaded, the potential difference formed by the piezoelectric field disappears, and the electrons accumulated on one electrode will flow back in the opposite direction, thus forming an AC current signal. During this process, the upper and lower electrodes of the piezoelectric sheet 112 will also generate a small voltage difference, forming a voltage signal.

[0047] Optionally, the signal acquisition module 2 is a single chip microcomputer, for example, an STM32 chip. The piezoelectric detection components in the two piezoelectric sheet assembly components 11 are connected to the signal acquisition module 2 through a wire. When a vehicle passes by, the signal acquisition module 2 successively collects two voltage signal waveforms generated by the piezoelectric detection components in the two piezoelectric sheet assembly components 11, and records the time corresponding to the peak values ​​of the two generated voltage signals.

[0048] See also Figure 4 , Figure 4 is a circuit diagram of an energy storage module provided by an embodiment of the utility model, such as Figure 4 As shown, the energy storage module 3 may include a rectifier power supply circuit 31 and an energy storage device 32. The rectifier power supply circuit 31 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a first capacitor C1. Among them, the positive electrode of the first diode D1 is respectively connected to the positive electrode of the third diode D3 and the lower plate of the first capacitor C1; the negative electrode of the first diode D1 is connected to the positive electrode of the second diode D2; the negative electrode of the third diode D3 is connected to the positive electrode of the fourth diode D4; the negative electrode of the second diode D2 is respectively connected to the negative electrode of the fourth diode D4 and the upper plate of the first capacitor C1; the positive electrode of the second diode D2 and the positive electrode of the fourth diode D4 serve as the input end of the rectifier power supply circuit 31, and the upper and lower plates of the first capacitor C1 serve as the output end of the rectifier power supply circuit 31. The energy storage device 32 is connected to the output end of the rectifier power supply circuit 31.

[0049] Alternatively, the energy storage device 32 may be a supercapacitor.

[0050] The piezoelectric energy-harvesting components in the two piezoelectric sheet assembly components 11 are connected to the input end of the rectifier power supply circuit 31 through a wire. When a vehicle passes by, the rectifier power supply circuit 31 converts the AC current signal generated by the piezoelectric energy-harvesting components in the piezoelectric sheet assembly components 11 into a DC current signal. The converted DC current signal provides power to the signal acquisition module 2 and the wireless transmission module 4 on the one hand, and stores the excess power through the energy storage device 32 on the other hand.

[0051] It can be understood that since the electrical signals generated by the piezoelectric energy capture component and the piezoelectric detection component in the piezoelectric sheet assembly 11 are relatively small, in order to better collect electrical signals, the electrical signals can be amplified using voltage / current amplifiers such as SR 560 and SR 570, and the amplified signals are collected by the signal acquisition module 2 and the energy storage module 3.

[0052] Optionally, the wireless transmitting module 4 is a ZigBee communication module.

[0053] Optionally, the external data processing terminal 7 may be a system terminal of a traffic management department or a highway management department.

[0054] Furthermore, the process of obtaining the vehicle speed and the traffic volume of the highway by the data processing terminal 7 according to the received voltage signal and the time when the peak value of the voltage signal is generated is described. Figure 5 , Figure 5 This is a schematic diagram of a highway traffic information collection device provided by the embodiment of the utility model for collecting information to obtain vehicle speed. Figure 5 As shown, two piezoelectric sheet assembly components 11 arranged in sequence along the track of the vehicle tires on the road are respectively marked as N1 and N2, and the distance between them is L1 which is less than the distance L2 between the front and rear wheels of the vehicle.

[0055] When the front tire of the vehicle passes the first piezoelectric sheet assembly N1 in the direction of travel, the mechanical force generated by the vehicle's travel acts on the first piezoelectric sheet assembly N1, and the signal acquisition module 2 collects the voltage signal generated by the piezoelectric detection component of the first piezoelectric sheet assembly N1 and records the time t1 when the peak value of the voltage signal is generated. The vehicle continues to move, and when the front tire of the vehicle passes the second piezoelectric sheet assembly N2 in the direction of travel, the mechanical force generated by the vehicle's travel acts on the second piezoelectric sheet assembly N2, and the signal acquisition module 2 collects the voltage signal generated by the piezoelectric detection component of the second piezoelectric sheet assembly N2 and records the time t2 when the peak value of the voltage signal is generated.

[0056] The data processing terminal 7 can obtain the speed v of the vehicle according to the times t1 and t2 of the peak values ​​of two consecutive voltage signals: v=L1 / (t2-t1).

[0057] Because the fixed distance L1 between the two piezoelectric sheet assemblies N1 and N2 is smaller than the distance L2 between the front and rear wheels of the vehicle, the time it takes for one tire of the vehicle to continuously pass through the two piezoelectric sheet assemblies N1 and N2 is relatively short. During this relatively short time, it can be approximately considered that the vehicle speed remains unchanged.

[0058] Since the two piezoelectric sheet assemblies N1 and N2 are arranged on the track of the vehicle tires, the vehicle directly rolls over the two piezoelectric sheet assemblies N1 and N2. When arranged in this way, the front and rear tires of the vehicle may roll over the two piezoelectric sheet assemblies N1 and N2 to generate multiple voltage signals. In order to accurately detect the traffic volume on the highway, the maximum time interval between the peak values ​​of the voltage signals of the two piezoelectric sheet assemblies N1 and N2 can be set to t4 in the data processing terminal 7. Only the peak value less than the time interval t4 can represent the voltage signal generated by the same wheel rolling over. By recording the number of peak values ​​generated per unit time, the road traffic volume is obtained. It should be noted that the peak value less than the time interval t4 represents the voltage signal generated by the same wheel rolling over, which needs to be removed.

[0059] The highway traffic information collection device of the utility model utilizes a piezoelectric power generation monitoring module to convert the mechanical force generated by a vehicle when traveling on the road into current signals and voltage signals. By collecting and storing the current signals, a stable power supply source can be provided for the entire device. Therefore, no external power supply is required, which reduces costs and reduces a lot of equipment maintenance and sensor network usage burdens.

[0060] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant is intended to cover non-exclusive inclusion, so that the article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the article or device including the elements. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The orientation or position relationship indicated by "up", "down", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0061] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A highway traffic information collection device, characterized in that: The highway traffic information collection device is buried on the road surface and comprises: a piezoelectric power generation monitoring module (1), a signal collection module (2), an energy storage module (3) and a wireless transmission module (4), wherein: The piezoelectric power generation monitoring module (1) is connected to the signal acquisition module (2) and the energy storage module (3) respectively; the energy storage module (3) is connected to the signal acquisition module (2) and the wireless transmission module (4) respectively; the wireless transmission module (4) is connected to the signal acquisition module (2); The piezoelectric power generation monitoring module (1) utilizes a piezoelectric sheet to convert the mechanical force generated when a vehicle is traveling on a road into a current signal and a voltage signal; The signal acquisition module (2) is used to acquire the voltage signal, record the time when the peak value of the voltage signal is generated, and transmit the voltage signal and the time when the peak value of the voltage signal is generated to the wireless transmission module (4); The energy storage module (3) is used to collect and store the current signal and to supply power to the signal collection module (2) and the wireless transmission module (4); The wireless transmission module (4) transmits the voltage signal and the time when the peak value of the voltage signal is generated to an external data processing terminal (7) in a wireless communication manner.

2. The highway traffic information collection device according to claim 1, characterized in that: The piezoelectric power generation monitoring module (1) comprises two piezoelectric sheet assembly components (11) arranged in sequence along the track of the vehicle tires on the road; The piezoelectric sheet assembly component (11) comprises a buffer layer (111) arranged on a road base layer (5), a plurality of piezoelectric sheets (112) being arranged on the buffer layer (111), and an asphalt layer (6) of the road being located above the plurality of piezoelectric sheets (112); Among the plurality of piezoelectric sheets (112), some piezoelectric sheets are connected to the signal acquisition module (2) as piezoelectric detection components, and the remaining piezoelectric sheets are connected to the energy storage module (3) as piezoelectric energy capture components.

3. The highway traffic information collection device according to claim 2, characterized in that: The distance between the two piezoelectric sheet assembly components (11) is smaller than the distance between the front and rear wheels of the vehicle.

4. The highway traffic information collection device according to claim 2, characterized in that: The plurality of piezoelectric sheets (112) are separated from the asphalt layer (6) by an intermediate layer (8) of foam or rubber material.

5. The highway traffic information collection device according to claim 2, characterized in that: The buffer layer (111) has protrusions corresponding one-to-one to the positions of the plurality of piezoelectric sheets (112), and the piezoelectric sheets (112) cover the corresponding protrusions on the buffer layer (111).

6. The highway traffic information collection device according to claim 5, characterized in that: The protrusion is hemispherical.

7. The highway traffic information collection device according to claim 1, characterized in that: The signal acquisition module (2) is a single chip microcomputer.

8. The highway traffic information collection device according to claim 1, characterized in that: The energy storage module (3) comprises a rectifier power supply circuit (31) and an energy storage device (32); The rectifier power supply circuit (31) comprises a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), and a first capacitor (C1), wherein the positive electrode of the first diode (D1) is respectively connected to the positive electrode of the third diode (D3) and the lower plate of the first capacitor (C1); the negative electrode of the first diode (D1) is connected to the positive electrode of the second diode (D2); the negative electrode of the third diode (D3) is connected to the positive electrode of the fourth diode (D4); the negative electrode of the second diode (D2) is respectively connected to the negative electrode of the fourth diode (D4) and the upper plate of the first capacitor (C1); the positive electrode of the second diode (D2) and the positive electrode of the fourth diode (D4) serve as the input end of the rectifier power supply circuit (31), and the upper and lower plates of the first capacitor (C1) serve as the output end of the rectifier power supply circuit (31); The energy storage device (32) is connected to the output end of the rectifier power supply circuit (31).

9. The highway traffic information collection device according to claim 8, characterized in that: The energy storage device (32) is a supercapacitor.

10. The highway traffic information collection device according to claim 1, characterized in that: The wireless transmission module (4) is a ZigBee communication module.

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