CN113237585A - Capacitive torque sensor and intelligent vehicle monitoring system - Google Patents
Capacitive torque sensor and intelligent vehicle monitoring system Download PDFInfo
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- CN113237585A CN113237585A CN202110330017.3A CN202110330017A CN113237585A CN 113237585 A CN113237585 A CN 113237585A CN 202110330017 A CN202110330017 A CN 202110330017A CN 113237585 A CN113237585 A CN 113237585A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 238000004806 packaging method and process Methods 0.000 claims abstract description 12
- 230000001939 inductive effect Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 238000005266 casting Methods 0.000 description 8
- 238000009434 installation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000010248 power generation Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000004026 adhesive bonding Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001364 causal effect Effects 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
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Abstract
The application discloses capacitanc torque sensor and intelligent vehicle monitoring system, this capacitanc torque sensor includes: the first electrode plate, the bracket and the circuit assembly; the circuit assembly comprises a packaging shell, a second electrode plate positioned on the surface of the packaging shell, an inductance element positioned in the packaging shell, an energy absorbing component and a signal transmitting antenna; the circuit assembly is arranged right above the first electrode plate through the support, the first electrode plate and the second electrode plate form a capacitor, the energy absorption component is used for converting absorbed energy into electric energy, the capacitor, the inductive element and the energy absorption component form a resonance circuit, the signal transmitting antenna is connected with the resonance circuit and used for radiating a resonance signal generated by the resonance circuit outwards, and the frequency of the resonance signal is in direct proportion to the torque borne by the capacitive torque sensor. The capacitive torque sensor can be mounted on the surface of a metal structural member to monitor the torque borne by the metal structural member, so that the detection precision is improved, and the cost is reduced.
Description
Technical Field
The application relates to the technical field of safety monitoring, in particular to a capacitive torque sensor and an intelligent vehicle monitoring system.
Background
With the development of intelligent manufacturing and the requirements on vehicle safety, the requirements on monitoring the vehicle state are provided, and especially, the monitoring of important parts such as a vehicle hub and a vehicle body frame is very important. In the field of aviation, sensors are usually embedded in metal structural parts in the casting process of important structural parts such as aeroengines and gas turbines, but the sensors are required to be capable of bearing high temperature, the manufacturing cost of the sensors is extremely high, the sensors cannot be applied to common vehicles in batches, and the service life and the performance of the sensors are reduced under the high temperature condition.
Disclosure of Invention
The embodiment of the application provides a capacitanc torque sensor and intelligent vehicle monitoring system, the mountable is on metallic structure surface to the moment of torsion that monitoring metallic structure bore improves and detects the precision, reduce cost.
In a first aspect, an embodiment of the present application provides a capacitive torque sensor, including a first electrode plate, a bracket, and a circuit assembly;
the circuit assembly comprises a packaging shell, a second electrode plate positioned on the surface of the packaging shell, and an inductance element, an energy absorbing component and a signal transmitting antenna which are positioned inside the packaging shell;
the circuit assembly is mounted above the first electrode plate through the support, the second electrode plate is opposite to the first electrode plate, the first electrode plate and the second electrode plate form a capacitor, the energy absorbing component is used for converting absorbed energy into electric energy, the capacitor, the inductive element and the energy absorbing component form a resonant circuit, the signal transmitting antenna is connected with the resonant circuit and used for radiating a resonant signal generated by the resonant circuit outwards, and the frequency of the resonant signal is in direct proportion to torque borne by the capacitive torque sensor.
Optionally, the bracket and the first electrode plate form a U-shaped structure, the first electrode plate is the bottom of the U-shaped structure, and the bracket is disposed at two ends of the first electrode plate and perpendicular to the first electrode plate.
Optionally, the scaffold is a columnar structure or a sheet-like structure.
Optionally, the first electrode plate and the inductance element are electrically connected through a conductive bracket.
Optionally, the package housing and the bracket are provided with mutually matched buckles, and the package housing is fixed to the upper end of the bracket through the buckles.
Optionally, the energy drawing means comprises a vibration generating means made of a piezoelectric material for converting vibration energy into electrical energy.
Optionally, the vibration power generation component is further configured to detect a vibration condition at a position where the capacitive torque sensor is located, wherein a voltage amplitude of the output power of the vibration power generation component is proportional to a vibration amplitude of the capacitive torque sensor.
Optionally, the energy drawing component is a wireless radio frequency energy receiving component, and the wireless radio frequency energy receiving component is configured to receive wireless radio frequency energy and convert the wireless radio frequency energy into electric energy.
Optionally, the capacitive torque sensor further includes an identification module, and the identification module is configured to add a corresponding identification to the resonant signal radiated by the signal transmitting antenna.
In a second aspect, an embodiment of the present application provides an intelligent vehicle monitoring system, including: at least one capacitive torque sensor as described in the first aspect, a signal receiving antenna and a processor;
the first electrode plate of the capacitive torque sensor is mounted on the surface of the metal structural part, and the capacitive torque sensor is used for converting the torque borne by the metal structural part into a resonance signal;
the signal receiving antenna is used for receiving the resonance signal radiated by the signal transmitting antenna;
the processor is used for processing the resonance signal received by the signal transmitting antenna and determining the torque borne by the metal structural part according to the frequency of the resonance signal.
Optionally, when the energy pumping member comprises a vibration generating member made of a piezoelectric material, the processor is further configured to determine a vibration condition of the metallic structure according to a voltage amplitude of the resonance signal.
Optionally, the processor is further configured to determine a vibration amplitude of the metallic structure according to the voltage amplitude of the resonance signal.
Optionally, each capacitive torque sensor further includes an identity module, the identity module is configured to add a corresponding identity to the resonant signal radiated by the signal transmitting antenna, and the processor is further configured to determine the installation position of the capacitive torque sensor according to the identity in the resonant signal.
The embodiment of the application provides a capacitanc torque sensor and intelligent vehicle monitoring system, can be used to monitoring wheel hub, the moment of torsion of metallic structure such as automobile body frame, vibration condition isoparametric, accessible welding, modes such as sticky, fix first plate electrode and support on metallic structure surface, then fix circuit assembly at the support top, can be at wheel hub, the installation of sensor is carried out again after high temperature casting such as automobile body frame cools off, high durability and convenient installation, and guarantee that the sensor can not receive high temperature to influence, the life-span and the performance of sensor have been improved. When the surface direction of the metal structural part is subjected to torque, the influence caused by the torque is amplified through deflection deformation of the support, the detection precision of the sensor is improved, and the capacitive torque sensor is simple in structure, low in cost and capable of being applied to monitoring of common vehicles in batches.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1A is a schematic structural diagram of a capacitive torque sensor according to an embodiment of the present disclosure;
fig. 1B is a schematic structural diagram of a capacitive torque sensor according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of an equivalent circuit of a capacitive torque sensor according to an embodiment of the present disclosure;
FIG. 3A is a schematic structural diagram of a cylindrical stent provided in an embodiment of the present application;
FIG. 3B is a schematic structural diagram of a sheet-like support according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of an equivalent circuit diagram of another capacitive torque sensor provided by an embodiment of the present application;
fig. 5 is a schematic diagram of an equivalent circuit of a capacitive torque sensor with an added identity tag according to an embodiment of the present application.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, in the case of no conflict, the features in the following embodiments and examples may be combined with each other; moreover, based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
This is explained in detail below with reference to the figures and the detailed description. Although the embodiments of the present application provide the method operation steps as shown in the following embodiments or figures, more or less operation steps may be included in the method based on the conventional or non-inventive labor. In steps where no necessary causal relationship exists logically, the order of execution of the steps is not limited to that provided by the embodiments of the present application.
Referring to fig. 1A and 1B, an embodiment of the present application provides a capacitive torque sensor, including: a first electrode plate 101, a support 102 and a circuit assembly 103. The circuit assembly 103 comprises a packaging shell 104, a second electrode plate 105 positioned on the surface of the packaging shell 104, and an inductance element 106, a power-drawing part 107 and a signal transmitting antenna 108 positioned inside the packaging shell 104, wherein the circuit assembly 103 is mounted right above the first electrode plate 101 through the bracket 102, so that the second electrode plate 105 faces the first electrode plate 101, and the first electrode plate 101 is separated from the second electrode plate 105 through air, namely the first electrode plate 101 and the second electrode plate 105 form a capacitor. The capacitor, the inductive element 106 and the energy absorbing component 107 form a resonant circuit, the signal transmitting antenna 108 is connected with the resonant circuit, an equivalent circuit of the capacitive torque sensor is shown in fig. 2, the energy absorbing component 107 is used for converting the absorbed energy into electric energy to provide the required electric energy for the resonant circuit, and the signal transmitting antenna 108 is used for radiating a resonant signal generated by the resonant circuit outwards, wherein the frequency of the resonant signal is proportional to the torque borne by the capacitive torque sensor.
In specific implementation, the support 102 may be made of a metal material or a non-metal material with certain toughness, referring to fig. 1A and fig. 1B, generally, two sides of the first electrode plate 101 may be respectively provided with one support, when the support 102 is stressed, a fixed point at the bottom of the support 102 is used as a fulcrum to generate a certain angle of deflection, and the larger the deflection angle generated by the support 102 is, the larger the borne moment is. In practical applications, the two brackets 102 may deflect in the same direction or in opposite directions, and once the brackets 102 deflect, the facing areas or the spacing distances between the first electrode plate 101 and the second electrode plate 105 may change, which may cause the capacitance value of the capacitor formed by the first electrode plate 101 and the second electrode plate 105 to change, the positive area and the capacitance value of each point on the first electrode plate 101 and each point on the second electrode plate 105 are directly proportional to each other, the distance value between the first electrode plate 101 and the second electrode plate 105 is inversely proportional to the capacitance value, and the total capacitance value of the capacitor is the integral sum of each point on the electrode plates. Referring to the equivalent circuit diagram of the capacitive torque sensor shown in fig. 2, once the capacitance value changes, the resonant frequency of the resonant circuit changes, and the resonant frequency is determined according to the change of the capacitance value
It is understood that the smaller the capacitance value of the capacitor, the larger the resonance frequency. I.e. the torque to which the bracket 102 is subjectedThe larger the moment, the smaller the facing area of the first electrode plate 101 and the second electrode plate 105, and the larger the electrode plate pitch, which results in a smaller capacitance value of the capacitor and a larger resonance frequency. Therefore, the frequency of the resonance signal is proportional to the torque borne by the capacitive torque sensor, and the magnitude of the torque borne by the bracket 102 can be obtained by analyzing the frequency change of the radiation signal of the signal transmitting antenna 108.
Under the condition that the support is not stressed, the capacitive torque sensor is mounted in a manner that the first electrode plate 101 and the second electrode plate 105 are opposite. The support rod may be made of a material with certain strength and toughness, and is not limited to a metal material, so as to ensure that the bracket 102 is easily deformed after being stressed and can return to the initial position after being unstressed.
The capacitive torque sensor can be used for monitoring the torque of metal structural members such as hubs and vehicle body frames, can be fixed on the surface of the metal structural member by welding and gluing in the manner of fixing the support 102 and the first electrode plate 101, then fixes the circuit assembly 103 on the top of the support 102, and can be installed after cooling high-temperature casting members such as hubs and vehicle body frames, and is convenient to install, capable of ensuring that the sensor is not influenced by high temperature, and capable of prolonging the service life and improving the performance of the sensor. When the surface direction of the metal structural part is subjected to torque, the influence caused by the torque is amplified through deflection deformation of the bracket 102, the detection precision of the sensor is improved, and the capacitive torque sensor is simple in structure, convenient to install, low in cost and capable of being applied to common vehicles in batches.
In a possible embodiment, the bracket 102 and the first electrode plate 101 form a U-shaped structure, the first electrode plate 101 is the bottom of the U-shaped structure, the bracket 102 is disposed at two ends of the first electrode plate, and the bracket 102 is perpendicular to the first electrode plate, and the specific structure can refer to fig. 1A.
During specific implementation, the first electrode plate 101 and the bracket 102 forming the U-shaped structure may be integrally formed, or may be fixed together in a later stage by welding, gluing, or the like, the first electrode plate 101 serves as a bottom plate of the U-shaped structure, two ends of the first electrode plate 101 are respectively provided with one bracket 102, and the bottom of each bracket 102 is fixedly connected with one end of the first electrode plate 101 to form the U-shaped structure. The bracket 102 is used as a supporting part on the U-shaped bracket 10, and is used for fixing the circuit assembly, so that the circuit assembly is suspended right above the first electrode plate 101, and then the first electrode plate 101 and the second electrode plate 105 form a capacitor, the capacitor and the inductance element 106 are connected in parallel to form an LC resonance circuit, and the equivalent circuit of the whole capacitive torque sensor is shown in fig. 2.
In practical application, the U-shaped structure can be directly cast on the metal structural member in the process of casting the metal structural members such as the wheel hub and the vehicle body frame, so that the connection between the U-shaped structure and the metal structural member is more reliable and stable, and after the casting of the metal structural member is completed, the circuit assembly is fixed to the top of the support 102 of the U-shaped structure.
In another possible embodiment, referring to fig. 1B, the bracket 102 and the first electrode plate 101 are separated from each other, and the bracket 102 is located on both sides of the first electrode plate 101 and is not connected to the first electrode plate 101, so that the movement of the bracket 102 is not restricted by the first electrode plate 101, and the torque applied to the sensor can be further amplified relative to the U-shaped structure.
In specific implementation, the first electrode plate 101 and the bracket 102 can be fixed on the surface of the metal structural member by welding or gluing, and then the circuit assembly is fixed at the upper end of the bracket 102, so that the circuit assembly is suspended right above the first electrode plate 101, the first electrode plate 101 and the second electrode plate 105 form a capacitor, the capacitor and the inductance element 106 are connected in parallel to form an LC resonance circuit, and the equivalent circuit of the whole capacitive torque sensor is shown in fig. 2.
In practical application, the first electrode plate 101 and the bracket 102 can be directly cast on the metal structural member in the process of casting the metal structural members such as the wheel hub and the vehicle body frame, so that the connection among the first electrode plate 101, the bracket 102 and the metal structural member is more reliable and stable, and after the casting of the metal structural member is completed, the circuit assembly is fixed on the top of the bracket 102.
On the basis of any of the above embodiments, the signal transmitting antenna 108 may be an inductance coil, and a signal processing circuit such as an amplifying circuit may be further added inside the package housing 104 to enhance the signal intensity radiated by the signal transmitting antenna 108.
In addition to any of the above embodiments, the holder 102 may have a column structure as shown in fig. 3A, or a sheet structure as shown in fig. 3B.
When the support 102 is a columnar structure as shown in fig. 3A, on the premise of ensuring that the support 102 has sufficient strength and toughness, the cross-sectional area of the support 102 is reduced as much as possible, so that the torque can be amplified better, that is, under the same torque, the smaller the cross-sectional area of the support 102 is, the larger the deflection amplitude of the support 102 is, and the larger the capacitance value change of the capacitor is. With the column structure of fig. 3A, the holder 102 can be deflected in all directions (i.e., directions indicated by dashed arrows in fig. 3A) parallel to the first electrode plate 101, i.e., is sensitive to torques in multiple directions.
When the bracket 102 is a sheet structure as shown in fig. 3B, the bracket 102 can be made to deflect left and right, i.e. to deflect in the direction indicated by the dotted arrow in fig. 3B, i.e. to be sensitive to the torque perpendicular to the plate-shaped bracket 102, and the strength of the bracket 102 in the sheet structure is high.
Referring to fig. 1A, 1B, 3A and 3B, the package housing 104 and the bracket 102 are provided with mutually matching clips 30, and the package housing 104 is fixed at the upper end of the bracket 102 through the clips 30, so as to facilitate installation and replacement of the circuit assembly.
In specific implementation, the bracket 102 may be made of a conductive material, an electrical path is formed between the first electrode plate 101, the bracket 102 and the inductance element 106, and the bracket 102 and the inductance element 106 may be electrically connected through a wire, or the package housing 104 may be made of a conductive material, and the bracket 102 may be electrically connected to the inductance element 106 through the package housing 104. Alternatively, the first electrode plate 101 and the inductance element 106 may be electrically connected by a wire, and the wire may be laid along the bracket 102, in which case the bracket 102 may also be made of a non-conductive material.
On the basis of any of the above embodiments, the energy pumping member 107 includes a vibration power generation member made of a piezoelectric material for converting vibration energy into electric energy. The piezoelectric material is a crystalline material which generates a voltage between two end surfaces when subjected to a pressure.
Referring to the equivalent circuit diagram of the capacitive torque sensor shown in fig. 4, the piezoelectric material is sensitive to vibration, and when the capacitive torque sensor is vibrated, the vibration energy is converted into electric energy, so that the resonant circuit can radiate electromagnetic wave signals with a certain frequency outwards, and the normal operation of the capacitive torque sensor is ensured. The vibration energy is converted into the electric energy through the vibration power generation component, and the long-term and continuous self-power supply of the capacitive torque sensor is realized, so that the power supply problem of the device is not considered in the use process, the difficult problem of battery replacement is avoided, and the problem of cost increase caused by the fact that the device is integrally replaced due to the power supply problem is also avoided.
Further, the voltage amplitude of the electric energy output by the vibration power generation component is directly proportional to the vibration amplitude of the capacitive torque sensor, and the larger the voltage amplitude output by the vibration power generation component is, the larger the amplitude of the resonance signal is, that is, the voltage amplitude of the resonance signal is directly proportional to the vibration amplitude of the capacitive torque sensor, so that the vibration condition of the capacitive torque sensor can be known by analyzing the amplitude change of the radiation signal of the signal transmitting antenna 108. That is, the vibration generating component can also be used to detect vibration conditions at the location of the capacitive torque sensor.
On the basis of any of the above embodiments, the energy drawing component 107 may also be a wireless rf energy receiving component, and the wireless rf energy receiving component is configured to receive wireless rf energy and convert the wireless rf energy into electric energy.
Specifically, a device for radiating wireless radio frequency energy can be installed near the position where the capacitive torque sensor is installed, so that even if the capacitive torque sensor is installed on a metal structural member moving like a hub, enough electric energy can be obtained in a wireless transmission mode, and the power supply problem of the capacitive torque sensor is solved.
On the basis of any of the above embodiments, the capacitive torque sensor further includes an identification module, and the identification module is configured to add a corresponding identification to the resonant signal radiated by the signal transmitting antenna 108.
The energy absorbing component 107 is connected with the signal transmitting antenna 108 through the identity module. The identity identification module is used for adding corresponding identity identifications in the resonance signals radiated by the signal transmitting antenna 108, and different capacitive torque sensors can be identified based on the identity identifications, so that specific monitoring positions and related information of each capacitive torque sensor can be determined.
In a specific implementation, the identification module may be an inductive device, such as the inductive device L1 shown in fig. 5, and different capacitive torque sensors are configured with different inductive devices L1, so that each capacitive torque sensor generates different voltage signals when detecting the same torque and vibration, thereby forming a respective identification, and determining the installation location of the capacitive torque sensor and other related information according to the unique identification of each capacitive torque sensor in the system.
Still provide an intelligent vehicle monitoring system based on this application embodiment, include: at least one capacitive torque sensor, a signal receiving antenna, and a processor. The first electrode plate of the capacitive torque sensor is mounted on the surface of a metal structural part to be monitored on a vehicle, such as a hub and a vehicle body frame, and the capacitive torque sensor is used for converting torque borne by the metal structural part into a resonance signal. The signal receiving antenna is used for receiving the resonance signal radiated by the signal transmitting antenna. The processor is used for processing the resonance signal received by the signal transmitting antenna and determining the torque borne by the metal structural part according to the frequency of the resonance signal.
Specifically, the capacitive torque sensor in the smart vehicle monitoring system may be the capacitive torque sensor in any of the above embodiments. The first electrode plate of the capacitive torque sensor is arranged on the surface of a metal structural member, the first electrode plate and the bracket can be fixed on the surface of the metal structural member in a welding, gluing and other modes, and then the circuit assembly is fixed on the top of the bracket. When the surface direction of the metal structural part is subjected to torque, the bracket of the capacitive torque sensor deflects, the facing area or the spacing distance between the first electrode plate and the second electrode plate changes, so that the capacitance value of a capacitor formed by the first electrode plate and the second electrode plate changes, and the frequency of a resonant signal radiated by a resonant circuit changes, namely, the capacitive torque sensor can convert the torque borne by the metal structural part into the frequency change of the resonant signal, and then radiate the resonant signal out through the signal transmitting antenna.
The signal receiving antenna is arranged at a position capable of receiving the radiation signal of the signal transmitting antenna, so that the resonance signal can be received in the movement process of the metal structural member. The signal receiving antenna receives the resonance signal radiated by the signal transmitting antenna and inputs the resonance signal into the processor, and the processor determines the torque borne by the metal structural part according to the frequency of the resonance signal.
Specifically, the frequency of the resonance signal is proportional to the torque borne by the metal structural part, that is, the processor can analyze the frequency of the resonance signal and determine the magnitude of the torque borne by the metal structural part according to the magnitude of the frequency of the resonance signal. The correspondence between the magnitude of the frequency of the resonance signal and the magnitude of the torque to which the metallic structural member is subjected can be determined experimentally in advance.
Further, when the energy absorbing member in the capacitive torque sensor comprises a vibration generating member made of a piezoelectric material, the processor is further configured to determine a vibration condition of the metallic structure according to a voltage amplitude of the resonance signal. Wherein the voltage amplitude of the resonance signal is proportional to the vibration amplitude of the capacitive torque sensor.
Specifically, the processor is further configured to determine a vibration amplitude of the metallic structure based on the voltage amplitude of the resonant signal. Wherein, the corresponding relation between the voltage amplitude of the resonance signal and the vibration amplitude of the metal structural member can be determined in advance through experiments.
On the basis of any one of the above embodiments, each capacitive torque sensor further includes an identification module, the identification module is configured to add a corresponding identification to the resonant signal radiated by the signal transmitting antenna, and the identification is used to determine the installation position of the capacitive torque sensor.
The energy absorbing component 107 is connected with the signal transmitting antenna 108 through the identity module. The identity identification module is used for adding corresponding identity identifications in the resonance signals radiated by the signal transmitting antenna 108, and different capacitive torque sensors can be identified based on the identity identifications, so that specific monitoring positions and related information of each capacitive torque sensor can be determined.
In a specific implementation, the identification module may be an inductive device, such as the inductive device L1 shown in fig. 5, in the smart vehicle monitoring system, different capacitive torque sensors are configured with different inductive devices L1, so that each capacitive torque sensor generates different voltage signals when detecting the same torque and vibration, and forms a respective identification, and determines the installation position of the capacitive torque sensor and other related information according to the unique identification of each capacitive torque sensor in the system.
The intelligent vehicle monitoring system of this application embodiment, can be used to monitoring wheel hub, the moment of torsion of metallic structure such as automobile body frame, vibration condition isoparametric, accessible welding, modes such as sticky, fix first plate electrode and support on metallic structure surface, then fix circuit assembly at the support top, can carry out the installation of sensor again after wheel hub, automobile body frame and other high temperature casting cooling, simple to operate, and guarantee that the sensor can not receive high temperature to influence, the life-span and the performance of sensor have been improved. When the surface direction of the metal structural part is subjected to torque, the influence caused by the torque is amplified through deflection deformation of the support, the detection precision of the sensor is improved, and the capacitive torque sensor is simple in structure, low in cost and capable of being applied to monitoring of common vehicles in batches.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A capacitive torque sensor, comprising: the first electrode plate, the bracket and the circuit assembly;
the circuit assembly comprises a packaging shell, a second electrode plate positioned on the surface of the packaging shell, and an inductance element, an energy absorbing component and a signal transmitting antenna which are positioned inside the packaging shell;
the circuit assembly is mounted above the first electrode plate through the support, the second electrode plate is opposite to the first electrode plate, the first electrode plate and the second electrode plate form a capacitor, the energy absorbing component is used for converting absorbed energy into electric energy, the capacitor, the inductive element and the energy absorbing component form a resonant circuit, the signal transmitting antenna is connected with the resonant circuit and used for radiating a resonant signal generated by the resonant circuit outwards, and the frequency of the resonant signal is in direct proportion to torque borne by the capacitive torque sensor.
2. The capacitive torque sensor according to claim 1, wherein the bracket and the first electrode plate form a U-shaped structure, the first electrode plate is a bottom of the U-shaped structure, and the bracket is disposed at two ends of the first electrode plate and perpendicular to the first electrode plate.
3. The capacitive torque transducer of claim 1, wherein the support is a columnar structure or a sheet structure.
4. The capacitive torque sensor of claim 1, wherein the first electrode plate and the inductive element are electrically connected by a conductive standoff.
5. The capacitive torque transducer according to claim 1, wherein the package housing and the bracket are provided with mutually matching snaps, and the package housing is fixed at the upper end of the bracket through the snaps.
6. The capacitive torque sensor of any one of claims 1 to 5, wherein the energy drawing means comprises a vibration generating means made of a piezoelectric material for converting vibration energy into electrical energy.
7. The capacitive torque sensor of claim 6, wherein the vibration generating component is further configured to detect a vibration condition at a location of the capacitive torque sensor, wherein a magnitude of a voltage of the electrical energy output by the vibration generating component is proportional to a magnitude of the vibration of the capacitive torque sensor.
8. The capacitive torque sensor of any one of claims 1 to 5, wherein the energy sink is a radio frequency energy receiver for receiving radio frequency energy and converting the radio frequency energy into electrical energy.
9. An intelligent vehicle monitoring system, comprising: at least one capacitive torque sensor according to any one of claims 1 to 8, a signal receiving antenna and a processor;
the first electrode plate of the capacitive torque sensor is mounted on the surface of a metal structural part to be monitored on a vehicle, and the capacitive torque sensor is used for converting torque borne by the metal structural part into a resonance signal;
the signal receiving antenna is used for receiving the resonance signal radiated by the signal transmitting antenna;
the processor is used for processing the resonance signal received by the signal transmitting antenna and determining the torque borne by the metal structural part according to the frequency of the resonance signal.
10. The system of claim 9, wherein when the energy pumping component comprises a vibration generating component made of a piezoelectric material, the processor is further configured to determine a vibration condition of the metallic structure based on a voltage amplitude of the resonant signal.
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|---|---|---|---|---|
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