CN109808520B - Electric vehicle wireless charging foreign matter and position detection method - Google Patents
Electric vehicle wireless charging foreign matter and position detection method Download PDFInfo
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- CN109808520B CN109808520B CN201910088826.0A CN201910088826A CN109808520B CN 109808520 B CN109808520 B CN 109808520B CN 201910088826 A CN201910088826 A CN 201910088826A CN 109808520 B CN109808520 B CN 109808520B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The invention relates to a system and a method for detecting wireless charging foreign matters and positions of an electric automobile, wherein the system comprises a charging platform and the electric automobile, wherein the charging platform is provided with a charging platform transmitting unit, and the electric automobile is provided with an electric automobile receiving unit; the charging platform transmitting unit comprises a metal shielding shell, a power supply module, a power oscillation module, a power transmitting coil, a power control circuit, a transmitting end communication module and a foreign matter and position detection module, wherein the power oscillation module and the power transmitting coil are sequentially connected with the power supply module; the electric automobile receiving unit comprises a power receiving coil, a rectification voltage-stabilizing module, an information monitoring and information modulation module, a receiving end communication module and a vehicle-mounted battery which are sequentially connected. The foreign body and position detection system can realize detection of metal foreign bodies, coordinate positioning and determination of the offset degree of the receiving coil relative to the transmitting coil, so that the wireless charging system of the electric automobile can be enabled to carry out efficient, stable and safe energy transmission.
Description
Technical Field
The invention relates to an electric vehicle wireless charging technology, in particular to a system and a method for detecting foreign matters and positions in electric vehicle wireless charging.
Background
In recent years, an electromagnetic coupling resonant wireless energy transmission technology is rapidly developed as a new wireless energy transmission technology, can realize long-distance and high-power energy transmission, is very suitable for wireless charging of electric vehicles, can realize unmanned charging and mobile charging on the premise of meeting the driving mileage of vehicle owners, greatly reduces the battery capacity of the vehicle through frequent charging, and reduces the purchase cost of the electric vehicles. In addition, the wireless charging device is convenient and safe to use, has no electricity contact phenomenon, and has no problems of sparks and the like caused by factors such as line aging and point discharge. The charging mode of the electric automobile in the future mainly takes wireless charging as the main mode.
Although wireless charging has unique advantages which are not achieved by the traditional wired power supply technology, in practice, a plurality of problems are solved, wherein two more key problems are solved, namely the coil alignment problem during wireless charging of the electric automobile and the safety problem that metal foreign matters are mixed into a magnetic field coupling area in the charging process. Inaccurate coil alignment before electric automobile charges can reduce charging efficiency, and too big direct charging that leads to of skew. Metal foreign matters are mixed in the charging process, and the metal is rapidly heated due to the eddy effect, so that potential safety hazards exist.
The existing foreign body and position detection method judges whether a foreign body exists or not by measuring the change of the magnetic field intensity in the detection coil, the difficulty of directly measuring the magnetic field is high, and the influence of the temperature change, the current change of the emission end and the alignment degree of the transmission coil on the magnetic field intensity is considered, and the influence caused by the existence of the metal foreign body is probably far less than the influence of the factors on the magnetic field. Therefore, the method for detecting the presence of the metallic foreign matter by measuring the change in the magnetic field strength is not highly accurate and practical.
Disclosure of Invention
In order to solve the problems, the invention designs a system for detecting the wireless charging foreign matters and the position of the wireless charging foreign matters applied to the electric automobile, which can realize the detection of the metal foreign matters, realize the coordinate positioning and determine the offset degree of a receiving coil relative to a transmitting coil, thereby ensuring that the wireless charging system of the electric automobile can carry out efficient, stable and safe energy transmission.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a foreign matter and position detection system charge that electric automobile is wireless which characterized in that: the electric vehicle charging system comprises a charging platform and an electric vehicle receiving unit arranged on an electric vehicle, wherein the charging platform is provided with a charging platform transmitting unit; the charging platform transmitting unit comprises a metal shielding shell, a power supply module arranged in the metal shielding shell, a power oscillation module, a power transmitting coil, a power control circuit, a transmitting end communication module and a foreign matter and position detection module, wherein the power oscillation module and the power transmitting coil are sequentially connected with the power supply module; the electric automobile receiving unit comprises a power receiving coil, a rectifying and voltage stabilizing module, an information monitoring and information modulating module, a receiving end communication module and a vehicle-mounted battery which are sequentially connected; the information monitoring and modulating module is used for detecting the real-time electric quantity information of the vehicle-mounted battery and transmitting the information to the transmitting terminal communication module through the receiving terminal communication module, and the vehicle-mounted battery is charged when the electric quantity is insufficient.
At foretell wireless foreign matter and position detecting system that charges of electric automobile, foreign matter and position detecting module are located the transmitting coil surface, include:
a resonance induction circuit: a plurality of weak coupling resonance coils are arranged and combined and used for measuring the resonance frequency change of the coupling circuit so as to judge whether foreign matters exist or not;
the coupling circuit: the inductive coupling or capacitive coupling is used for reducing the fluctuation of the resonant frequency of the induction circuit;
the detection circuit: and the charging platform is connected with the power supply module, and stops supplying power when the magnetic field coupling area is detected to have metal foreign matters or the transmission coil is misaligned.
A wireless charging foreign matter and position detection method for an electric automobile is characterized by comprising the following steps: the system power supply process comprises the following steps:
step 1, detecting whether a vehicle exists on a charging platform; if the charging platform has no vehicle, the charging platform is closed; if the vehicle is detected, performing a second step;
step 2, current is introduced into the foreign matter and position detection module to detect the foreign matter, and whether the foreign matter exists is judged by measuring the change of the resonant frequency of the coupling circuit; if the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, performing a third step; if the resonance frequencies of all the coils are normal, performing the fourth step;
step 3, when the foreign matter and position detection module detects that the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, the detection coil can be judged to have the metal foreign matter, the accurate positioning of the metal foreign matter can be quickly realized by numbering the resonance coil array, then the power supply to the current foreign matter and position detection module is stopped, and a foreign matter position message is sent to a driving program, so that the foreign matter on the charging platform is removed;
step 4, checking whether the electric quantity state of the vehicle-mounted battery is one hundred percent; if the electric quantity state of the vehicle-mounted battery is one hundred percent, stopping supplying power to the charging platform; if the electric quantity of the vehicle-mounted battery is not enough, performing a fifth step;
step 5, current is introduced into the foreign matter and position detection module to detect the position of the vehicle-mounted receiving coil, under the condition that other circuits and elements are not added, the foreign matter and position detection module considers the receiving coil as a 'foreign matter' of a foreign matter detection system, the position of the receiving coil can also influence the inductive reactance value of the resonance coil, so that the resonance frequency of the measurement coupling circuit changes, and the position deviation degree of the power receiving coil can be determined by numbering the resonance coil array, so that the position detection is realized; when the power receiving coil and the power transmitting coil are completely overlapped, the detection circuit sends a signal to the charging platform power supply module to start electrifying and wirelessly charges the electric automobile; and finally, stopping the charging process of the electric automobile after the battery is fully charged.
Compared with the prior art, the invention has the beneficial effects that: 1. the foreign matter detection is realized before the wireless charging system of the electric automobile is charged, so that potential safety hazards caused by metal foreign matters mixed in a magnetic field coupling area are avoided, and the resonant coil array is adopted to realize the accurate positioning of the metal foreign matters; 2. under the condition that other circuits and elements are not added, the position detection of the receiving coil can be realized at the same time, and the power is started after the coupling coil is completely aligned, so that the high efficiency of wireless power transmission is ensured. 3. The coupling circuit is added on the charging platform, the resonant frequency of the coupling circuit is measured to judge whether metal foreign matters exist or not, and the inductive reactance value of the coupling circuit is measured in advance, so that the influence of lead inductance and resistance on detection when the resonant frequency is measured is avoided, and the detection accuracy is improved.
Drawings
Fig. 1 is an overall functional schematic of the present invention.
Fig. 2 is a schematic view of the overall structure of the foreign object and position detection according to the present invention.
FIG. 3 is a schematic diagram of the loop arrangement of the weakly coupled resonant coil of the present invention.
Fig. 4 is a schematic diagram of the receiver coil position offset detection of the present invention.
Fig. 5 is a power flow diagram of the present invention.
Detailed Description
The following describes a specific embodiment of the present invention with reference to the drawings.
In order to solve the problems of coil alignment and safety of metal foreign bodies mixed in a magnetic field coupling area during wireless charging of the electric automobile, the invention designs the wireless charging foreign body and position detection system for the electric automobile, which can realize detection of the metal foreign bodies, coordinate positioning and determination of the offset degree of a receiving coil relative to a transmitting coil, thereby ensuring that the wireless charging system for the electric automobile can carry out efficient, stable and safe energy transmission.
As shown in fig. 1, in order to achieve the above purpose, the technical solution adopted by the present invention is: a wireless charging foreign matter and position detection system for an electric automobile comprises a charging platform and the electric automobile, wherein the charging platform is provided with a charging platform transmitting unit 1, and the electric automobile is provided with an electric automobile receiving unit 2; the charging platform transmitting unit 1 comprises a metal shielding shell, a power supply module 11, a power oscillation module 12, a power transmitting coil 16, a power control circuit 13, a transmitting end communication module 14 and a foreign matter and position detection module 15, wherein the power oscillation module 12 and the power transmitting coil 16 are sequentially connected with the power supply module 11; the electric vehicle receiving unit 2 comprises a power receiving coil 21, an information monitoring and information modulating module 22, a rectifying and voltage stabilizing module 23, a receiving end communication module 24 and a vehicle-mounted battery 25 which are connected in sequence.
The power supply module 11 provides a charging voltage for the power oscillation module 12; the power oscillation module 12 oscillates the power input from the power supply module into a high-frequency oscillation circuit; the power control circuit 13 controls the on-off of the power oscillation module; the transmitting end communication module 14 realizes communication with the receiving end communication module 24; the power transmitting coil 16 and a high-frequency oscillating circuit oscillated by the transmitting power oscillating module adopt a combined coil array, and each coil in the array adopts a concentric double-coil structure to generate a uniform high-frequency alternating-current magnetic field; the foreign matter and position detection module 15 is used for detecting the existence of metal foreign matters in the transmission channel, realizing accurate positioning and determining the offset degree between the receiving coil and the transmitting coil; the metal shielding shell is made of aluminum materials, the thickness of the metal shielding shell is about 2mm, and the electromagnetic shielding effect is good.
The power receiving coil 21 receives the energy transmitted by the power transmitting coil 16, and the coil is positioned at the bottom of the electric automobile; the rectification and voltage stabilization module 23 is configured to rectify and stabilize the high-frequency alternating current received by the receiving coil, so as to transmit the high-frequency alternating current to the vehicle-mounted battery 25; the information monitoring and modulating module 22 is used for detecting real-time electric quantity information of the vehicle-mounted battery 25, transmitting the information to the transmitting terminal communication module 14 through the receiving terminal communication module 24, and charging when the electric quantity is insufficient; the receiving end communication module 24 is used for realizing information exchange with the transmitting end communication module 14; the vehicle-mounted battery 25 stores electricity used by the electric vehicle.
As shown in fig. 2, in the above-mentioned wireless charging foreign object and position detecting system for an electric vehicle, the foreign object and position detecting module 15 is located on the surface of the transmitting coil, and is composed of a resonant sensing circuit, a coupling circuit and a detecting circuit, wherein the resonant sensing circuit and the coupling circuit are coupled inductively or capacitively, the coupling circuit is used for reducing the fluctuation of the resonant frequency of the sensing circuit, the detecting circuit is connected to the power supply module, and the charging platform stops supplying power when detecting that there is a metal foreign object in the magnetic field coupling area or the transmitting coil is misaligned. The resonance induction circuit is arranged and combined by adding a plurality of weak coupling resonance coils, and the existence of the foreign matters can be judged by measuring the change of the resonance frequency of the coupling circuit because the existence of the metal foreign matters can influence the inductive reactance value of the resonance coils.
As shown in fig. 3, the foreign object and position detection module 15 is in the form of a resonant coil array instead of a single large detection coil, so that the foreign object detection system can have high accuracy even when confronted with a very small metal object (such as a key ring, etc.), and the resonant coil array can accurately detect the position coordinates of the foreign object. When the foreign matter detection circuit detects that the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, the fact that the coil has the metal foreign matter can be judged, and the coordinates of the metal foreign matter can be rapidly determined by numbering the resonance coils.
As shown in fig. 4, the foreign object and position detection module 15 considers the receiving coil as a "foreign object" of the foreign object detection system, and the position of the receiving coil also affects the inductive reactance value of the resonant coil, which in turn causes a change in the resonant frequency of the measurement coupling circuit, and the degree of position deviation of the power receiving coil can be determined by numbering the resonant coil, so as to implement position detection. When the power receiving coil and the power transmitting coil are completely overlapped, the detection circuit sends a signal to the charging platform power supply module to start electrifying, and the electric automobile is charged wirelessly.
As shown in fig. 5, a power supply process of a wireless charging foreign object and position detection system of an electric vehicle includes the following steps:
step one, detecting whether a vehicle exists on a charging platform. If the charging platform has no vehicle, the charging platform is closed; if the vehicle is detected, performing a second step;
and step two, introducing current into the foreign matter and position detection module 15 to detect the foreign matter, and judging whether the foreign matter exists or not by measuring the change of the resonant frequency of the coupling circuit. If the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, performing a third step; if the resonance frequencies of all the coils are normal, performing the fourth step;
step three, judging that a metal foreign body exists on the detection coil, numbering the resonant coil array to quickly realize accurate positioning of the metal foreign body, then stopping power supply to the current foreign body and the position detection module 15, and sending a foreign body position message to a driving program to remove the foreign body on the charging platform;
and step four, checking whether the electric quantity state of the vehicle-mounted battery 25 is one hundred percent. If the electric quantity state of the vehicle-mounted battery is one hundred percent, stopping supplying power to the charging platform; if the electric quantity of the vehicle-mounted battery is not enough, performing a fifth step;
and step five, introducing current into the foreign matter and position detection module 15 to detect the position of the vehicle-mounted receiving coil, and when the power receiving coil 21 and the power transmitting coil 16 are completely overlapped, sending a signal to the charging platform power supply module 11 by a detection circuit to start electrifying and wirelessly charging the electric automobile. And finally, stopping the charging process of the electric automobile after the battery is fully charged.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (2)
1. A wireless charging foreign matter and position detection method for an electric automobile is characterized by comprising the following steps: the system for detecting the foreign matters and the positions in the wireless charging of the electric automobile comprises a charging platform and an electric automobile receiving unit arranged on the electric automobile, wherein a charging platform transmitting unit is arranged on the charging platform; the charging platform transmitting unit comprises a metal shielding shell, a power supply module arranged in the metal shielding shell, a power oscillation module, a power transmitting coil, a power control circuit, a transmitting end communication module and a foreign matter and position detection module, wherein the power oscillation module and the power transmitting coil are sequentially connected with the power supply module; the electric automobile receiving unit comprises a power receiving coil, a rectifying and voltage stabilizing module, an information monitoring and information modulating module, a receiving end communication module and a vehicle-mounted battery which are sequentially connected; the information monitoring and modulating module is used for detecting real-time electric quantity information of the vehicle-mounted battery and transmitting the information to the transmitting terminal communication module through the receiving terminal communication module, and the vehicle-mounted battery is charged when the electric quantity is insufficient;
the system power supply process comprises the following steps:
step 1, detecting whether a vehicle exists on a charging platform; if the charging platform has no vehicle, the charging platform is closed; if the vehicle is detected, performing a second step;
step 2, current is introduced into the foreign matter and position detection module to detect the foreign matter, and whether the foreign matter exists is judged by measuring the change of the resonant frequency of the coupling circuit; if the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, performing a third step; if the resonance frequencies of all the coils are normal, performing the fourth step;
step 3, when the foreign matter and position detection module detects that the difference exists between the resonance frequency of a certain coil and the ideal resonance frequency and exceeds a set threshold value, the coil can be judged to have the metal foreign matter, the accurate positioning of the metal foreign matter can be quickly realized by numbering the resonance coil array, then the power supply to the current foreign matter and position detection module is stopped, and a foreign matter position message is sent to a driving program, so that the foreign matter on the charging platform is removed;
step 4, checking whether the electric quantity state of the vehicle-mounted battery is one hundred percent; if the electric quantity state of the vehicle-mounted battery is one hundred percent, stopping supplying power to the charging platform; if the electric quantity of the vehicle-mounted battery is not enough, performing a fifth step;
step 5, current is introduced into the foreign matter and position detection module to detect the position of the vehicle-mounted receiving coil, under the condition that other circuits and elements are not added, the foreign matter and position detection module considers the receiving coil as a 'foreign matter' of a foreign matter detection system, the position of the receiving coil can also influence the inductive reactance value of the resonance coil, so that the resonance frequency of the measurement coupling circuit changes, and the position deviation degree of the power receiving coil can be determined by numbering the resonance coil array, so that the position detection is realized; when the power receiving coil and the power transmitting coil are completely overlapped, the detection circuit sends a signal to the charging platform power supply module to start electrifying and wirelessly charges the electric automobile; and finally, stopping the charging process of the electric automobile after the battery is fully charged.
2. The method for detecting the wireless charging foreign matter and the position of the electric automobile according to claim 1, is characterized in that: the foreign matter and position detection module is located the transmitting coil surface, includes:
a resonance induction circuit: a plurality of weak coupling resonance coils are arranged and combined and used for measuring the resonance frequency change of the coupling circuit so as to judge whether foreign matters exist or not;
the coupling circuit: the inductive coupling or capacitive coupling is used for reducing the fluctuation of the resonant frequency of the induction circuit;
the detection circuit: and the charging platform is connected with the power supply module, and stops supplying power when the magnetic field coupling area is detected to have metal foreign matters or the transmission coil is misaligned.
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| CN110077247A (en) * | 2019-06-06 | 2019-08-02 | 北京有感科技有限责任公司 | Wireless charging foreign matter detection system and detection method based on optical fiber sensing network |
| CN112134373B (en) * | 2019-06-24 | 2024-04-12 | 西安中兴新软件有限责任公司 | Metal foreign matter detection method, wireless charging equipment and receiving system |
| CN110626187A (en) * | 2019-10-21 | 2019-12-31 | 中兴新能源汽车有限责任公司 | Metal foreign matter detection device, detection method and wireless charging system |
| CN110884370B (en) * | 2019-12-06 | 2021-05-28 | 兰州理工大学 | Conductor foreign matter detection device for wireless charging device of electric vehicle |
| CN110860489B (en) * | 2019-12-16 | 2023-12-01 | 上海圣享科技股份有限公司 | Foreign matter detection and classification device and detection and classification method thereof in wireless power supply technology |
| CN111146874A (en) * | 2020-03-06 | 2020-05-12 | 美芯晟科技（北京）有限公司 | Wireless charging foreign matter detection method |
| CN111431259B (en) * | 2020-04-30 | 2021-11-23 | 中兴新能源汽车有限责任公司 | Wireless charging starting method and device and storage medium |
| CN111682654B (en) * | 2020-05-11 | 2023-03-24 | 哈尔滨工业大学 | Design method of intelligent foreign matter detection system for wireless power transmission |
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| CN112165180B (en) * | 2020-09-30 | 2022-08-30 | 北京理工大学 | Wireless charging system and control method |
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| CN112550009B (en) * | 2020-11-27 | 2022-05-13 | 南方科技大学 | Wireless charging foreign matter detection device and electric vehicle parking auxiliary device |
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