CN113859154A - System and method for generating power and feeding back information based on tire deformation - Google Patents
System and method for generating power and feeding back information based on tire deformation Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002033 PVDF binder Substances 0.000 claims abstract description 118
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 117
- 238000011217 control strategy Methods 0.000 claims abstract description 9
- 230000003750 conditioning effect Effects 0.000 claims description 29
- 238000012545 processing Methods 0.000 claims description 19
- 239000003381 stabilizer Substances 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000009123 feedback regulation Effects 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 230000003993 interaction Effects 0.000 abstract description 3
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- 239000000463 material Substances 0.000 description 10
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- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
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Abstract
The invention relates to a system and a method for generating power and feeding back information based on tire deformation, wherein the system is characterized in that a power generation element and a sensing element which are made of PVDF piezoelectric films are arranged in a tire, namely a first PVDF piezoelectric film (for power generation) and a second PVDF piezoelectric film (for sensing), the second PVDF piezoelectric film can timely and accurately sense the interaction between a wheel and the ground, the road surface environment information is directly acquired, the error is small, the real-time performance is strong, and the problem of lack of acquisition of the road environment information is solved; the first PVDF piezoelectric film and the power management chip can effectively convert tire deformation energy into electric energy, so that the energy utilization rate is improved, the single chip microcomputer supplies power, the maintenance cost is reduced, meanwhile, the PVDF piezoelectric film is used as a power generation element and a sensing element, and the integration level is high; the single chip microcomputer can feed back road surface environment data to the whole vehicle control unit in time, and prompt the whole vehicle control unit to change a control strategy in time when the road surface changes, so that the driving safety of the vehicle is improved.
Description
Technical Field
The invention belongs to the technical field of sensing systems, and particularly relates to a system and a method for power generation and information feedback based on tire deformation.
Background
In recent years, automobile electromotion, intellectualization, networking and sharing become a great trend of global automobile industry development, advancing planning and control of vehicles are continuously optimized and upgraded, and meanwhile, higher requirements are put forward on accuracy and universality of environmental data acquisition. Meanwhile, the global environment problem is increasingly serious, and the energy demand is continuously increased. The automobile industry is used as a pillar type industry of global industry, has huge energy consumption, and needs to gradually improve the energy utilization rate and reduce the energy consumption.
At present, the collection of automobile environment data on the market mainly aims at sensing and collecting obstacles, lane lines, traffic signals, pedestrians and the like, so as to plan and control the running of the automobile, and the sensing of road surface parameters, such as friction factors, wet and slippery degree and other information is relatively lacked.
At present, various vehicle-mounted wireless sensors always adopt a battery power supply mode to measure and send wireless data. Although the power supply mode is reliable and low in difficulty, the maintenance cost is high, the batteries are complicated to replace, even partial batteries cannot be replaced, and the consumption is high.
Disclosure of Invention
Aiming at the technical problems that the sensing of road surface parameters is lack, the maintenance cost for measuring and sending wireless data by adopting a battery power supply mode is high, the battery replacement is complicated, even partial batteries cannot be replaced, and the consumption is large in the prior art, the invention provides a system for generating power and feeding back information based on tire deformation. The invention also provides a method for generating power and feeding back information based on tire deformation.
The technical scheme of the invention is as follows:
a system for generating power and feeding back information based on tire deformation is characterized by comprising:
the device comprises a first PVDF piezoelectric film, a second PVDF piezoelectric film, a conditioning circuit, a single chip microcomputer, a power management chip and a whole vehicle control unit;
the first PVDF piezoelectric film and the second PVDF piezoelectric film are alternately arranged and compounded in the tire, and the first PVDF piezoelectric film is in communication connection with the power management chip and is used for providing electric energy for the tire; the second PVDF piezoelectric film is in communication connection with the conditioning circuit and is used for transmitting a charge signal corresponding to road environment information during driving to the conditioning circuit;
the conditioning circuit is respectively connected with the second PVDF piezoelectric film and the single chip microcomputer and is used for receiving a charge signal generated by the second PVDF piezoelectric film, converting the charge signal into a voltage signal and then sending the voltage signal to the single chip microcomputer for data processing;
the single chip microcomputer is respectively in communication connection with the conditioning circuit, the power management chip and the vehicle control unit, and is used for performing data processing on a voltage signal which is sent by the conditioning circuit and reflects road environment information and wirelessly transmitting a processing result to the vehicle control unit for feedback regulation;
the power management chip is used for converting the charges generated by the first PVDF piezoelectric film into stable direct-current voltage to supply power to the single chip microcomputer.
Further, the first PVDF piezoelectric film has the size of 80mm × 30mm × 200 μm, is alternately arranged in the tire in series/parallel connection and is used for outputting a charge signal corresponding to the deformation of the tire to the power management chip according to the deformation of the tire tread; the second PVDF piezoelectric film is 30mm 100 μm in size, is arranged in the tire in series, and is used for generating a corresponding charge signal according to the tire deformation information and sending the charge signal to the conditioning circuit.
Further, wirelessly transmitting the processing result to the vehicle control unit for feedback adjustment includes: and the whole vehicle control unit calculates and adjusts a control strategy and dynamic output according to a preset formula according to the processing result reflecting the road environment information.
Further, the road environment information includes: the road surface parameters comprise an adhesion coefficient, roughness, road surface type and gradient, and the running state parameters comprise a slip rate and tire stress.
Further, the power management chip comprises a piezoelectric transducer and a power management circuit which are connected with each other, and a rectifier and a voltage stabilizer which are integrated on the power management circuit and connected with each other; the piezoelectric transducer is connected with the first PVDF piezoelectric film and is used for converting a charge signal sent by the first PVDF piezoelectric film into alternating voltage; the rectifier is connected with the piezoelectric transducer, and adopts a full-wave bridge rectifier for rectifying alternating voltage output by the piezoelectric transducer into direct-current voltage; the voltage stabilizer adopts a step-down voltage stabilizer and is used for adjusting the direct current voltage output by the rectifier and stabilizing the direct current voltage within a set value range so as to output the stable direct current voltage to supply power for the single chip microcomputer.
Further, the type of the single chip microcomputer is as follows: arduino maga 2560; the model of the power management circuit is LTC 3588-1.
Furthermore, the first PVDF piezoelectric film and the second PVDF piezoelectric film are compounded at the inner side and the outer side of the tire; the conditioning circuit, the single chip microcomputer and the power management chip are all arranged inside the wheel hub.
A method for generating power and feeding back information based on tire deformation, wherein the method is performed by the system according to any one of claims 1-7, and the method comprises the following steps:
the power management chip collects charge signals generated by the first PVDF piezoelectric film according to tire deformation, processes and outputs stable direct-current voltage to supply power to the single chip microcomputer;
the conditioning circuit collects charge signals generated by the second PVDF piezoelectric film according to tire deformation, converts the charge signals into voltage signals and sends the voltage signals to the single chip microcomputer for data processing;
the single chip microcomputer wirelessly transmits the processed data to a vehicle control unit;
and the whole vehicle control unit feeds back and adjusts the control strategy and the dynamics output information according to the received processed data so as to control the vehicle to run.
Further, the first PVDF piezoelectric film has a size of 80mm x 30mm x 200 μm, and is alternately arranged in series/parallel in the tire; the second PVDF piezoelectric film, having dimensions of 30mm by 100 μm, is arranged in series in the tyre.
Further, the type of the single chip microcomputer is as follows: arduino maga 2560.
The invention has the following technical effects:
according to the system and the method for generating power and feeding back information based on tire deformation, the power generation element and the sensing element which are made of the PVDF piezoelectric film are arranged in the tire, namely the first PVDF piezoelectric film (for power generation) and the second PVDF piezoelectric film (for sensing), the sensing element which is made of the PVDF piezoelectric film, namely the second PVDF piezoelectric film, can timely and accurately sense the interaction between the wheel and the ground, the road surface environment information is directly acquired, the error is small, the real-time performance is strong, and the problem of lack of acquisition of the road environment information is solved; the PVDF piezoelectric film is used as a power generation element, namely the first PVDF piezoelectric film and the power management chip, which are made of the PVDF piezoelectric film, can effectively convert the tire deformation energy into electric energy, so that the energy utilization rate is improved, the power can be supplied to a single chip microcomputer per se, the maintenance cost is reduced, and meanwhile, the PVDF piezoelectric film is used as the power generation element and the sensing element, so that the integration level is high; the single chip microcomputer can feed back road surface environment information to the whole vehicle control unit in time, and prompt the whole vehicle control unit to change a control strategy in time when the road surface changes, so that the driving safety of the vehicle is improved. The invention is not limited by the type and driving environment of the vehicle, has wide applicability and lower cost, can be widely applied to various vehicles, and provides a self-supplied system and a method for sensing road surface information.
The positive piezoelectric effect of PVDF (polyvinylidene fluoride) material is utilized to generate electricity, and due to the good compatibility of PVDF and tire material, PVDF can be made into piezoelectric films and compounded in the tire, the pulse voltage is generated along with the deformation of the tire, the voltage generated by each piezoelectric film is output by the contact of an electric brush slip ring and an output device, and the voltage is rectified and stored for utilization. In addition, the PVDF material can be used as a sensing system material, has the unique advantages of low cost, high flexibility, strong compatibility with tire materials and the like, and in the driving process of a vehicle, the tire deforms the PVDF piezoelectric film (for sensing) to generate electric charges, the electric charges are converted into voltage signals and then are transmitted to the single chip microcomputer to carry out data, so that the road surface state can be sensed, different road surface conditions are distinguished, and road surface environment data such as slip rate, adhesion coefficient and the like are obtained. And the whole vehicle control unit optimizes dynamic control according to the data and adjusts the corresponding system output of the vehicle. The PVDF piezoelectric film is used for data acquisition through tire deformation, the real-time degree of road environment information is high, the information source is stable and accurate, and the PVDF piezoelectric film is not influenced by the environment. The tire deformation can be used as an environmental information source of the tire sensor for processing and can also be used as an energy source for providing electric energy for the tire sensor, so that the vehicle dynamics optimization control of a whole vehicle control unit is facilitated, the maintenance cost is effectively reduced, and the resources are saved.
Drawings
Fig. 1 is a schematic structural diagram of a system for generating power and feeding back information based on tire deformation according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a connection relationship and an information transmission relationship between components of a system for generating power and feeding back information based on tire deformation according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a power management chip connected to a first PVDF piezoelectric film according to an embodiment of the invention.
Fig. 4 is a flowchart of a method for generating power and feeding back information based on tire deformation according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.
The invention relates to a system for generating power and feeding back information based on tire deformation, which is improved in the way that the existing various vehicle-mounted wireless sensors are powered by batteries, and the tire deformation can be used as an environmental information source of a tire sensor to process and use and can also be used as an energy source to provide electric energy by arranging a first PVDF piezoelectric film (for power generation) and a second PVDF piezoelectric film (for sensing) which are compounded in the tire when a vehicle runs, and particularly, as shown in figure 1, the system comprises a first PVDF piezoelectric film 1, a second PVDF piezoelectric film 2, a conditioning circuit 3, a singlechip 5, a power management chip 4 and a whole vehicle control unit (not shown in the figure); the first PVDF piezoelectric film is a piezoelectric film with a larger area and a thicker thickness, the size is 80mm x 30mm x 200 mu m, the size of the second PVDF piezoelectric film is 30mm x 100 mu m, and the sizes of the first PVDF piezoelectric film and the second PVDF piezoelectric film are not limited in particular. As shown in fig. 2, the first PVDF piezoelectric film (PVDF piezoelectric film 80mm x 30mm x 200 μm) is communicatively connected to a power management chip for providing electrical power to the tire; the second PVDF piezoelectric film (PVDF piezoelectric film 30mm 100 μm) is in communication connection with the conditioning circuit and is used for transmitting charge signals corresponding to road environment information during driving to the conditioning circuit. The first PVDF piezoelectric film can be compounded in the tire due to strong compatibility with the tire material. In order to ensure safety, the first PVDF piezoelectric film is compositely arranged at the inner side and the outer side of the tire. When an automobile runs, the first PVDF piezoelectric film generates a pulsating voltage under the action of pressure, and outputs a stable direct-current voltage after passing through a piezoelectric transducer and a power management circuit in a power management chip shown in figure 3 to supply power to a single chip microcomputer, wherein the type of the single chip microcomputer is Arduino maga 2560. The first PVDF piezoelectric film is used as a transduction material, a structure of series-parallel alternate arrangement is adopted, the voltage output of the piezoelectric film is improved in series connection, the energy collection rate is improved, and multiple layers of the first PVDF piezoelectric film are connected in parallel to collect low-frequency vibration energy in the environment.
The conditioning circuit is preferably installed inside the wheel hub, and as shown in fig. 2, the conditioning circuit is respectively connected to the second PVDF piezoelectric film (PVDF piezoelectric film 30mm x 100 μm) and the single chip microcomputer (Arduino maga2560), and is configured to receive a tiny charge signal generated by the second PVDF piezoelectric film (PVDF piezoelectric film 30mm x 100 μm), convert the charge signal into a voltage signal, and send the voltage signal to the single chip microcomputer (Arduino maga2560) for data processing.
The second PVDF piezoelectric film is uniformly distributed and compounded in the tire. As shown in fig. 2, when the automobile is running, the second PVDF piezoelectric film (PVDF piezoelectric film 30mm x 100 μm) is subjected to pressure to generate electric charge, and the electric charge is converted into a voltage signal by the conditioning circuit, and then sent to the single chip microcomputer (Arduino maga2560) for data processing. The second PVDF piezoelectric film (PVDF piezoelectric film 30mm 100 μm) is used as a sensing material, and the output voltage is improved, the design difficulty of the conditioning circuit is reduced, and the measurement precision is improved in a mode of arranging a plurality of piezoelectric films in series.
As shown in fig. 1, the single chip microcomputer 5 is in communication connection with the conditioning circuit 3, the power management chip 4 and the vehicle control unit (not shown in the figure), and the single chip microcomputer 5 is configured to perform data processing on the voltage signal, which is sent by the conditioning circuit 3 and reflects the road environment information, and wirelessly transmit the processing result to the vehicle control unit for feedback adjustment.
The power management chip 4 is preferably disposed inside the wheel hub, as shown in fig. 1, and connected to the first PVDF piezoelectric film 1 and the single chip microcomputer 5, for converting the charge generated by the first PVDF piezoelectric film into a stable dc voltage to power the single chip microcomputer 5. The piezoelectric transducer, the power management circuit, the rectifier and the voltage stabilizer are integrated in the power management chip, for example, the power management chip can be directly connected with a piezoelectric power supply, and after rectification and voltage reduction, stable direct-current voltage as shown in fig. 3 is output to supply power to the single chip microcomputer 5. The electric charge of the first PVDF piezoelectric film 1 generated by tire deformation can output stable direct current voltage to supply power for the single chip microcomputer after being converted by the power management chip 4. Specifically, as shown in fig. 1-3, the power management chip 4 includes a piezoelectric transducer and a power management circuit connected to each other, and a rectifier and a voltage regulator integrated on the power management circuit and connected to each other; the piezoelectric transducer is connected with the first PVDF piezoelectric film 1 and is used for converting a charge signal sent by the first PVDF piezoelectric film into alternating voltage; the rectifier is connected with the piezoelectric transducer, a full-wave bridge rectifier is adopted for rectifying alternating voltage output by the piezoelectric transducer into direct-current voltage, and the type of the rectifier is not specifically limited; the voltage stabilizer adopts a step-down voltage stabilizer and is used for adjusting the direct current voltage output by the rectifier and stabilizing the direct current voltage within a set value range so as to output the stable direct current voltage to supply power for the singlechip 5.
Specifically, in the above embodiment, for example, in the power management chip based on the LTC3588-1 power management circuit, in order to output the voltage generated by the first PVDF piezoelectric film, a layer of metal film with good flexibility is plated on both sides of the first PVDF piezoelectric film to serve as a polar plate, and the area of the polar plate is slightly smaller than that of the first PVDF piezoelectric film. Preferably, the plate lead adopts a high-quality flexible stranded wire to prevent the tire from being broken due to repeated pressure deformation. The piezoelectric transducer converts the collected strain energy into electric energy, and then sends the electric energy into the LTC3588-1 power management circuit, a low-loss full-wave bridge rectifier and a voltage-reducing type voltage stabilizer are integrated in the power management circuit, the low-loss full-wave bridge rectifier and the voltage-reducing type voltage stabilizer can be directly connected to a piezoelectric power supply, and stable output is provided after rectification and voltage reduction. In addition, the chip can provide 4 different voltage outputs through the configuration pins. Wherein, piezoelectric transducer's effect does: the first PVDF piezoelectric film is used as an excitation source, and the first PVDF piezoelectric film is also deformed in the tire deformation process, so that potential difference is formed on the upper surface and the lower surface of the piezoelectric layer, and the piezoelectric transducer is used for converting deformation energy in the thickness direction into electric energy and outputting alternating voltage. The power management circuit has the following functions: the alternating current output by the piezoelectric transducer is converted into stable direct current voltage for the sensor to work. As shown in fig. 3, the low-loss full-wave bridge rectifier in the power management circuit mainly rectifies the alternating voltage output by the piezoelectric transducer into a direct voltage with large fluctuation, and outputs the direct voltage to the load after filtering; the step-down voltage regulator is a power supply circuit capable of automatically adjusting output voltage, and can stabilize direct-current voltage with large fluctuation output by a low-loss full-wave bridge rectifier in a power management circuit within a set value range so as to obtain stable direct-current voltage.
The invention also relates to a method for generating power and feeding back information based on tire deformation, as shown in fig. 4, the method comprises the following steps: the power management chip collects charge signals generated by the first PVDF piezoelectric film according to tire deformation, processes and outputs stable direct-current voltage to supply power to the single chip microcomputer; the conditioning circuit collects charge signals generated by the second PVDF piezoelectric film according to tire deformation, converts the charge signals into voltage signals and sends the voltage signals to the single chip microcomputer for data processing; the single chip microcomputer wirelessly transmits the processed data to a vehicle control unit; and the whole vehicle control unit feeds back and adjusts the control strategy and the dynamics output information according to the received processed data so as to control the vehicle to run.
In particular, in this example, the first PVDF piezoelectric film, having dimensions of 80mm by 30mm by 200 μm, is alternately arranged in series/parallel in the tyre; a second PVDF piezoelectric film, having dimensions of 30mm by 100 μm, was arranged in series in the tire. The type of the singlechip is as follows: arduino maga 2560.
Specifically, in this embodiment, the method for generating power and feeding back information based on tire deformation according to the present invention is described as follows: along with the vehicle goes, the tire tread constantly takes place to deform, leads to first PVDF piezoelectric film 1, the second PVDF piezoelectric film 2 of equipartition constantly to produce the electric charge, and first PVDF piezoelectric film 1 is because area, thickness are great, and the electric charge production electric charge is more, and the electric charge is as stable direct current voltage output after 4 conversions of power management chip and is the singlechip 5 power supply. The 2 areas of second PVDF piezoelectric film are less, and mainly used collects tire deformation information, exports electric charge to conditioning circuit 3, inputs singlechip 5 after turning into voltage signal, and the contact condition of real-time perception tire and road surface obtains road environmental information, and road environmental information includes: the road surface parameters comprise adhesion coefficient, roughness, road surface types and gradient, the driving state parameters comprise slip rate and tire stress, and the road surface types comprise asphalt, ice surface and gravel road surface. And finally, the singlechip 5 sends the road surface parameter and the driving state parameter information to the whole vehicle control unit, and the whole vehicle control unit calculates and adjusts information such as control strategies and dynamic output after receiving the road environment information, so that the safety of the vehicle is ensured, and the dynamic performance of the vehicle is optimized.
Based on the embodiment of the invention, the system and the method for generating power and feeding back information based on tire deformation provided by the invention have the advantages that through arranging the power generation element and the sensing element which are made of the PVDF piezoelectric film in the tire, namely the first PVDF piezoelectric film (for power generation) and the second PVDF piezoelectric film (for sensing), the sensing element which is made of the PVDF piezoelectric film, namely the second PVDF piezoelectric film, can accurately sense the interaction between the wheel and the ground in time, the road surface environment information is directly acquired, the error is small, the real-time performance is strong, and the problem of lack of acquisition of the road environment information is solved; the PVDF piezoelectric film is used as a power generation element, namely the first PVDF piezoelectric film and the power management chip, which are made of the PVDF piezoelectric film, can effectively convert the tire deformation energy into electric energy, so that the energy utilization rate is improved, the power can be supplied to a single chip microcomputer per se, the maintenance cost is reduced, and meanwhile, the PVDF piezoelectric film is used as the power generation element and the sensing element, so that the integration level is high; the single chip microcomputer can feed back road surface environment information to the whole vehicle control unit in time, and prompt the whole vehicle control unit to change a control strategy in time when the road surface changes, so that the driving safety of the vehicle is improved.
Moreover, the PVDF material has the unique advantages of low cost, high flexibility, good flexibility, strong compatibility with tire materials, high mechanical strength, good chemical corrosion resistance, easy formation of large-area films with complex shapes and the like, can meet the requirement of poor working conditions of tires, and can meet the requirement of large-area laying in tires due to strong compatibility with tire materials. During the running process of a vehicle, the PVDF piezoelectric film (for sensing) deformed by the tire generates electric charges, the electric charges are converted into voltage signals and then transmitted to the single chip microcomputer for data, so that the road surface state can be sensed, different road surface conditions are distinguished, and road surface environment data such as slip rate, adhesion coefficient and the like are obtained. And the whole vehicle control unit optimizes dynamic control according to the data and adjusts the corresponding system output of the vehicle. The PVDF piezoelectric film is used for data acquisition through tire deformation, the real-time degree of road environment information is high, the information source is stable and accurate, and the PVDF piezoelectric film is not influenced by the environment. The tire deformation can be used as an environmental information source of the tire sensor for processing and can also be used as an energy source for providing electric energy for the tire sensor, so that the vehicle dynamics optimization control of a whole vehicle control unit is facilitated, the maintenance cost is effectively reduced, and the resources are saved.
It should be noted that the above-mentioned embodiments enable a person skilled in the art to more fully understand the invention, without restricting it in any way. Therefore, although the present invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A system for generating power and feeding back information based on tire deformation is characterized by comprising:
the device comprises a first PVDF piezoelectric film, a second PVDF piezoelectric film, a conditioning circuit, a single chip microcomputer, a power management chip and a whole vehicle control unit;
the first PVDF piezoelectric film and the second PVDF piezoelectric film are alternately arranged and compounded in the tire, and the first PVDF piezoelectric film is in communication connection with the power management chip and is used for providing electric energy for the tire; the second PVDF piezoelectric film is in communication connection with the conditioning circuit and is used for transmitting a charge signal corresponding to road environment information during driving to the conditioning circuit;
the conditioning circuit is respectively connected with the second PVDF piezoelectric film and the single chip microcomputer and is used for receiving a charge signal generated by the second PVDF piezoelectric film, converting the charge signal into a voltage signal and then sending the voltage signal to the single chip microcomputer for data processing;
the single chip microcomputer is respectively in communication connection with the conditioning circuit, the power management chip and the vehicle control unit, and is used for performing data processing on a voltage signal which is sent by the conditioning circuit and reflects road environment information and wirelessly transmitting a processing result to the vehicle control unit for feedback regulation;
the power management chip is used for converting the charges generated by the first PVDF piezoelectric film into stable direct-current voltage to supply power to the single chip microcomputer.
2. The system according to claim 1, characterized in that said first PVDF piezoelectric film has dimensions of 80mm x 30mm x 200 μm, is arranged in said tyre in series/parallel and alternately, and is used for outputting to the power management chip, according to the deformation of the tyre tread, a charge signal corresponding to the deformation of the tyre; the second PVDF piezoelectric film is 30mm 100 μm in size, is arranged in the tire in series, and is used for generating a corresponding charge signal according to the tire deformation information and sending the charge signal to the conditioning circuit.
3. The system of claim 2, wherein the wirelessly transmitting the processing result to the vehicle control unit for feedback adjustment comprises: and the whole vehicle control unit calculates and adjusts a control strategy and dynamic output according to a preset formula according to the processing result reflecting the road environment information.
4. The system of claim 3, wherein the road environment information comprises: the road surface parameters comprise an adhesion coefficient, roughness, road surface type and gradient, and the running state parameters comprise a slip rate and tire stress.
5. The system of claim 4, wherein the power management chip comprises a piezoelectric transducer and a power management circuit connected to each other and a rectifier and a voltage regulator integrated on the power management circuit and connected to each other; the piezoelectric transducer is connected with the first PVDF piezoelectric film and is used for converting a charge signal sent by the first PVDF piezoelectric film into alternating voltage; the rectifier is connected with the piezoelectric transducer, and adopts a full-wave bridge rectifier for rectifying alternating voltage output by the piezoelectric transducer into direct-current voltage; the voltage stabilizer adopts a step-down voltage stabilizer and is used for adjusting the direct current voltage output by the rectifier and stabilizing the direct current voltage within a set value range so as to output the stable direct current voltage to supply power for the single chip microcomputer.
6. The system of claim 5, wherein the single chip microcomputer is of a type: arduino maga 2560; the model of the power management circuit is LTC 3588-1.
7. The system according to any one of claims 1 to 6, wherein the first PVDF piezoelectric film and the second PVDF piezoelectric film are compounded at the inner side and the outer side of the tire; the conditioning circuit, the single chip microcomputer and the power management chip are all arranged inside the wheel hub.
8. A method for generating power and feeding back information based on tire deformation, wherein the method is performed by the system according to any one of claims 1-7, and the method comprises the following steps:
the power management chip collects charge signals generated by the first PVDF piezoelectric film according to tire deformation, processes and outputs stable direct-current voltage to supply power to the single chip microcomputer;
the conditioning circuit collects charge signals generated by the second PVDF piezoelectric film according to tire deformation, converts the charge signals into voltage signals and sends the voltage signals to the single chip microcomputer for data processing;
the single chip microcomputer wirelessly transmits the processed data to a vehicle control unit;
and the whole vehicle control unit feeds back and adjusts the control strategy and the dynamics output information according to the received processed data so as to control the vehicle to run.
9. The method according to claim 8, characterized in that said first PVDF piezoelectric film, having dimensions of 80mm by 30mm by 200 μm, are arranged alternately in series/parallel in said tyre; the second PVDF piezoelectric film, having dimensions of 30mm by 100 μm, is arranged in series in the tyre.
10. The method of claim 8, wherein the type of the single chip microcomputer is: arduino maga 2560.
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