Method and device for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals

Abstract

The present invention relates to a method and device for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals. The method comprises: if the electric vehicle battery is connected to a charging circuit, a GNSS signal is received. If there is no GNSS signal, the charging of the electric vehicle battery is shut down; if there is a GNSS signal, the GNSS signal is forwarded vertically above the electric vehicle battery and in a plurality of evenly distributed horizontal directions; the echo signal of the GNSS forwarded signal is captured, and the number of captured echo signal paths is combined with a preset indoor judgment model to judge whether the electric vehicle battery is indoors. If it is indoors, the charging of the electric vehicle battery is shut down; if it is not indoors, the charging of the electric vehicle battery is turned on. Through the technical solution of the present invention, the charging of the electric vehicle battery is automatically shut down when the GNSS signal cannot be received. When the GNSS signal can be received, the GNSS signal is forwarded in multiple paths and then it is judged whether the electric vehicle battery is indoors according to the number of received echo paths to automatically shut down or turn on the charging, thereby avoiding the potential safety hazards caused by the indoor charging of the electric vehicle battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle battery charging management, and in particular relates to a method and a device for automatically shutting down indoor charging of an electric vehicle battery based on a GNSS signal. Background Art

[0002] Due to the physical characteristics of electric vehicle batteries or improper production and use, they are prone to spontaneous combustion, fire and other safety accidents during charging and discharging; and due to the incomplete public facilities for electric vehicle storage and charging or the convenience of users, users often bring electric vehicles or electric vehicle batteries into closed or semi-closed indoor spaces such as corridors, rooms, and basements for storage and charging. Such indoor spaces lead to greater safety accidents when spontaneous combustion or fire occurs, and there are serious safety hazards. In response to this phenomenon, the government, community, village committee, property and other institutions have issued management regulations that strictly prohibit electric vehicles or batteries from entering corridors and indoors, but supervision is difficult to eliminate, and there is a lack of a technical means to automatically shut down the charging of electric vehicle batteries in closed or semi-closed indoor spaces such as corridors, rooms, and basements.

[0003] GNSS is the global navigation satellite system, which mainly includes the United States' GPS, Russia's Glonass, Europe's Galileo, and China's BeiDou satellite navigation system. The use of GNSS technology has become the most commonly used navigation and positioning means. Ground vehicles, smart phones, etc. rely on satellite navigation receivers to provide high-precision navigation and positioning information. GNSS signals have the advantages of being received uninterruptedly throughout the day and are not easily affected by weather, but there is a defect that GNSS signals cannot be received in shielded indoor spaces. Whether the advantages and disadvantages of GNSS technology can be used to automatically determine whether the electric vehicle battery is indoors or outdoors, thereby automatically prohibiting the electric vehicle battery from charging indoors, is of great practical significance for research at present. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals, which utilizes the characteristics that GNSS signals can be received uninterruptedly throughout the day in open spaces and cannot be received in shielded indoor spaces to determine whether the electric vehicle battery is indoors, thereby automatically shutting off or turning on the charging of the electric vehicle battery, so as to solve the current lack of effective technical means for automatically shutting off the charging of electric vehicle batteries in closed or semi-enclosed indoor spaces such as corridors, rooms, and basements.

[0005] The technical solution provided by the present invention to solve the technical problem is as follows:

[0006] In a first aspect, the present invention provides a method for automatically shutting down indoor charging of an electric vehicle battery based on a GNSS signal, comprising the steps of: S1, if the electric vehicle battery is connected to a charging circuit, receiving a GNSS signal, and if there is no GNSS signal, shutting down the charging of the electric vehicle battery; if there is a GNSS signal, S2, forwarding the GNSS signal vertically above the electric vehicle battery and in a number of evenly distributed horizontal directions; S3, capturing an echo signal of the GNSS forwarded signal, combining the number of captured echo signals with a preset indoor judgment model, and judging whether the electric vehicle battery is indoors, and if so, shutting down the charging of the electric vehicle battery; and if not, turning on the charging of the electric vehicle battery.

[0007] In a second aspect, the present invention provides a device for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals, comprising: a GNSS signal receiving unit for receiving GNSS signals; a signal forwarding and echo capture unit for forwarding the received GNSS signals vertically above the electric vehicle battery and in several evenly distributed horizontal directions, and capturing the echo signals of the forwarded signals; a signal processing unit for combining the captured echo signal paths with a preset indoor judgment model to determine whether the electric vehicle battery is indoors, and if so, shutting down the charging of the electric vehicle battery; if not, turning on the charging of the electric vehicle battery.

[0008] The beneficial effects of the present invention include:

[0009] On the first aspect, the present invention utilizes the characteristics that GNSS signals can be received all day in open outdoor spaces but often cannot be received in indoor spaces due to shielding. When the electric vehicle battery is connected to the charging circuit, it detects whether the GNSS signal can be received. If the GNSS signal cannot be received, it is determined that the electric vehicle battery is located in a closed or semi-closed indoor space, and the charging of the electric vehicle battery is automatically turned off.

[0010] Secondly, since GNSS signals can be received in some semi-enclosed spaces, such as indoor terraces or near windows, the present invention forwards the received GNSS signals as local signals and then multi-path forwards them to several directions vertically upward and evenly distributed horizontally. The number of echo signal paths of shielding bodies such as captured building walls is used to further determine whether the electric vehicle battery is in a semi-enclosed indoor space, so that if the GNSS signal can be received, it is determined that the electric vehicle battery is in an indoor space and the charging of the electric vehicle battery is automatically shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below in conjunction with the accompanying drawings.

[0012] Figure 1 is a flow chart of a method for automatically shutting down indoor charging of an electric vehicle battery based on GNSS signals provided by an embodiment of the present invention;

[0013] Figure 2 It is a schematic diagram of a structure for determining whether an electric vehicle battery is in a semi-enclosed indoor space based on a GNSS signal provided by an embodiment of the present invention;

[0014] Figure 3 is a schematic diagram of a GNSS signal vector tracking process provided by an embodiment of the present invention;

[0015] Figure 4 It is a schematic diagram of the structure of a device for automatically shutting down indoor charging of an electric vehicle battery based on GNSS signals provided in an embodiment of the present invention.

[0016] Figure ID:

[0017] 1-GNSS satellite; 2-semi-enclosed indoor space; 3-electric vehicle battery; 4-GNSS signal; 5-GNSS forwarding signal; 6-echo signal; 7-GNSS signal receiving unit; 8-signal forwarding and echo capture unit; 9-signal processing unit; 10-GNSS signal channel; 11-GNSS forwarding signal and echo signal channel; 12-detection target. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] At present, the prohibition of moving electric vehicles or electric vehicle batteries 3 into closed or semi-enclosed indoor spaces 2 such as corridors, rooms, and basements is generally achieved through administrative means such as issuing management regulations. There are also some ideas that use technical means, such as setting up electronic fences to sound an alarm when electric vehicle batteries 3 enter buildings. However, the cost is high and a corresponding data management platform needs to be established, so it has not been effectively applied. At present, under the background of the state taking the lead in establishing a new energy monitoring platform, the BMS system of energy storage batteries gradually has wireless methods such as WIFI, Bluetooth, GNSS, etc. to connect to the monitoring platform to implement full life cycle management of the battery. The present invention uses the characteristics of GNSS technology to connect to signals outdoors all day long without interruption, but often without signals indoors. The presence or absence of GNSS signals 4 and the use of echo signals 6 that are transmitted after converting GNSS signals 4 into local signals and reflected by the building wall as detection targets 12 are used as the basis for judging whether the electric vehicle or electric vehicle battery 3 is indoors, and then the BMS system of the electric vehicle battery 3 automatically shuts down the charging of the electric vehicle battery 3 indoors and allows the charging of the electric vehicle battery 3 to be connected outdoors. The indoor space mentioned in the present invention generally refers to closed indoor spaces such as corridors, rooms, basements, etc., and also generally refers to semi-enclosed indoor spaces 2 including terraces, windows, and large glass building walls.

[0020] Please refer to Figure 1 , Figure 2 , Figure 3 The present invention provides a method for automatically shutting down indoor charging of an electric vehicle battery 3 based on a GNSS signal 4, comprising the steps of: S1, if the electric vehicle battery 3 is connected to a charging circuit, receiving the GNSS signal 4, if there is no GNSS signal 4, shutting down the charging of the electric vehicle battery 3; if there is a GNSS signal 4, S2, forwarding the GNSS signal 4 vertically above the electric vehicle battery 5 and in a plurality of evenly distributed horizontal directions; S3, capturing an echo signal 6 of the GNSS forwarded signal 5, combining the captured echo signal 6 with a preset indoor judgment model, judging whether the electric vehicle battery 3 is indoors, if it is indoors, shutting down the charging of the electric vehicle battery 3; if it is not indoors, turning on the charging of the electric vehicle battery 3.

[0021] Specifically, GNSS provides a new technical means for target control and measurement, and its technical feature is to extract the parameter characteristics of the target by using the navigation satellite pseudo-random code signal or carrier signal reflected by the target. There are two detection targets of the present invention. One target is to detect whether there is a GNSS signal 4 so as to automatically shut down the charging of the electric vehicle battery 3 in a place where there is no GNSS signal 4. The other target is to detect whether the vertical upper and horizontal surroundings of the electric vehicle battery 4 contain building walls when there is a GNSS signal 4. If the included building wall, that is, the echo signal 6 that can be received, meets the preset indoor judgment model, it is judged to be indoors and the charging of the electric vehicle battery 3 is automatically shut down. The application of GNSS usually includes a GNSS satellite 1 and a GNSS signal receiving unit 7. If it is in an open outdoor space, multiple satellite signals can be received. Generally, 4 or more satellite signals are received, which can be used for positioning and target detection. In some cases, the electric vehicle battery 3 is not necessarily indoors. For example, it may be judged as indoors if it is placed under a big tree or surrounded by multiple buildings. From the perspective of eliminating safety hazards, in this case, it is judged as indoors to shut down the charging of the electric vehicle battery 3, which is also within the indoor range generally referred to by the present invention.

[0022] Furthermore, after receiving the GNSS signal 4 and before step S2, the GNSS signal 4 is vector-tracked and processed into a local GNSS forwarding signal 5, and then split-processed according to the number of forwarding paths.

[0023] Specifically, in the application of GNSS, the capture and tracking of signals will directly affect the final signal output accuracy. The working principle of the tracking loop of traditional GNSS belongs to scalar tracking. The measurements of code phase and carrier frequency by each tracking channel are independent of each other, and the common information between tracking loops is not fully explored. As one of the research hotspots of modern navigation tracking technology, vector tracking can integrate all tracking channel information and combine it with positioning output, so that it has the ability to track weak signals, high dynamic signals and anti-interference without adding any external hardware assistance. The basic idea of ​​vector tracking is to estimate the position, velocity and time information of the GNSS signal receiving unit 7 based on the observed quantity and the system dynamic equation; then predict the pseudorange, pseudorange rate and line of sight vector matrix between the GNSS signal receiving unit 7 and the GNSS satellite 1 based on the satellite ephemeris information; and then control the loop digital controlled oscillator (NCO) according to the predicted pseudorange and pseudorange rate. Unlike scalar tracking, vector tracking associates the pseudorange and pseudorange rate measurement channels that were originally independent of each other through filters. The reason is that in the loop tracking process, the receiver position, velocity and time information are shared. This is the essential difference between vector tracking and scalar tracking. Since the vector tracking technology associates the satellite signals received by multiple GNSS signal channels 10 for further GNSS signal 4 tracking, the improvement of the present invention is that the present solution uses the vector tracking technology to associate the satellite signals received by multiple GNSS signal channels 10, and then forwards them as reference signals to GNSS forwarding signals 5, and then it is very convenient to perform signal tracking and building wall target detection through GNSS forwarding signals and echo signal channels 11. The associated GNSS forwarding signal 5 is used for signal tracking and building wall target detection. Generally speaking, the building wall of the indoor space contains the top surface vertically above and the surrounding surface surrounding it, that is, there are at least 5 directions of building wall target detection. For some special shapes of indoor spaces, such as arcs or polygons, more or less than 5 faces are used to detect whether there is a building wall according to the actual situation. The present invention uses the most common top surface and four surrounding surfaces with a total of 5 detection directions as an example, and the detection number of building walls of other shapes is more or less than 5. It is also included in the scheme included in this invention. Accordingly, the GNSS forwarding signal 5 is divided into 5 transmission paths and amplified, in order to recover the echo signal 6 reflected by the building wall, the GNSS forwarding signal 5 is used to track the target through the GNSS forwarding signal and the echo signal channel 11. For the signal after the branching, phase tracking is used to obtain higher tracking accuracy.

[0024] Furthermore, the vector tracking processing process includes: collecting the code phase errors and carrier frequency errors of all GNSS signal channels 10 in the received GNSS signal 4 and filtering the data through the signal processing unit 9 to obtain a reference code phase and carrier frequency as a local signal to track the GNSS forwarding signal 5 and capture the echo signal 6 through the GNSS forwarding signal and echo signal channel 11.

[0025] Furthermore, the preset indoor judgment model is: if an echo signal 6 is captured vertically above the electric vehicle battery, and the number of echo signals 6 captured in the horizontal direction is not less than the set number threshold, then it is judged that the electric vehicle battery 3 is indoors; otherwise, it is judged that the electric vehicle battery is not indoors.

[0026] Specifically, after the GNSS forwarding signal 5 is split, the horizontal direction that transmits signals vertically upward and in several horizontal directions can adopt multiple paths, or can be preset to 4 paths. If a building wall or a shielding body is encountered, signal reflection will occur, so that the echo is captured. If there is no building wall or shielding body, there is no echo signal 6 or the echo signal 6 is too weak to be captured. The number of captured echo signals 6 is used to determine whether the electric vehicle battery 3 is indoors. Due to the existence of a fully enclosed indoor space or a semi-enclosed indoor space 2 with glass and windows, generally speaking, if more than three-quarters of the number of echo signals 6 including the echo signals emitted to the top surface vertically upward and the echo signals emitted to the surrounding surface in the horizontal direction can be captured, it can be judged as indoors. Whether the judgment standard is more flexible, such as the number of echo paths that can be captured is greater than or less than three-quarters, can be preset according to the specific situation. Based on this, the indoor judgment model is that if the signal branch echo transmitted by the GNSS forwarding signal 5 to the building wall vertically above the electric vehicle battery 3 is received, and the signal echo of three-quarters of the signal branches transmitted to the building wall in the horizontal direction is received, then it is judged that the electric vehicle battery 3 is indoors.

[0027] Furthermore, the method of the present invention further comprises: if there is a GNSS signal 4, performing GNSS positioning on the electric vehicle battery 3 and storing the positioning data.

[0028] Specifically, the electric vehicle battery 3 can receive the GNSS signal 4 and forward and detect the target, then the GNSS signal 4 is used for positioning, and after the positioning data is stored, the positioning data can be transmitted to the battery management big data platform for full life cycle management of the battery.

[0029] The present invention also provides a device for automatically shutting down the indoor charging of the electric vehicle battery 3 based on the GNSS signal 4. The device is built into the electric vehicle battery 3. Please refer to Figure 3 , Figure 4The device of the present invention includes: a GNSS signal receiving unit 7, which is used to receive a GNSS signal 4 when the electric vehicle battery 3 is connected to a charging circuit; a signal forwarding and echo capturing unit 8, which is used to forward the received GNSS signal 4 vertically above the electric vehicle battery and in a plurality of evenly distributed horizontal directions, and capture an echo signal 6 of the GNSS forwarding signal 5 through a GNSS forwarding signal and an echo signal channel 11; a signal processing unit 9, which is used to combine the captured echo signal 6 with a preset indoor judgment model to judge whether the electric vehicle battery is indoors, and if so, turn off the charging of the electric vehicle battery; if not, turn on the charging of the electric vehicle battery.

[0030] Specifically, if the signal processing unit 9 receives the signal branch echo transmitted by the GNSS forwarding signal 5 to the building wall vertically above the electric vehicle battery 3 through the GNSS forwarding signal and echo signal channel 11, and receives the signal echo of three-quarters of the signal branches transmitted to the building wall in the horizontal direction through the GNSS forwarding signal and echo signal channel, it is determined that the electric vehicle battery 3 is indoors.

[0031] Furthermore, the signal processing unit 9 also includes performing vector tracking processing on the GNSS signal 4 received by the GNSS signal receiving unit 7, and then performing branching processing according to the number of forwarding paths, so as to track the GNSS forwarding signal 5 and use the echo signal to take the building wall as the detection target 12.

[0032] Furthermore, the preset indoor judgment model is: if an echo signal 6 is captured vertically above, and the number of echo signals 6 captured horizontally is not less than the set path number threshold, it is judged that the electric vehicle battery 3 is indoors; otherwise, it is judged that the electric vehicle battery 3 is not indoors. The path number threshold is preset according to the actual situation, and this embodiment takes three quarters as an example.

[0033] Furthermore, the device of the present invention sends the judgment result of whether the electric vehicle battery 3 is indoors or not indoors to the BMS of the electric vehicle battery, and the BMS executes turning off or turning on the charging of the electric vehicle battery 3 .

[0034] Furthermore, the device of the present invention also includes GNSS positioning of the electric vehicle battery 3 and storing the positioning data.

[0035] It should be noted that the present invention refers to receiving the GNSS signal 4 if the electric vehicle battery 3 is connected to the charging circuit, which means both when the electric vehicle battery 3 is just connected to the charging circuit and the electric vehicle battery 3 is not turned on, and after the electric vehicle battery 3 is connected to the charging circuit and the electric vehicle battery 3 is turned on, if the GNSS signal 4 is received, the charging of the electric vehicle battery 3 that has been turned on is turned off. In fact, the scheme of receiving the GNSS signal 4 also includes the case where the electric vehicle battery 3 is not connected to the charging circuit. In this case, the GNSS signal 3 can be continuously received to locate the electric vehicle battery. In order to save power consumption, when the electric vehicle battery 3 is not connected to the charging circuit, the GNSS signal forwarding, echo recovery and indoor building wall target detection can be turned off.

[0036] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the methods and core ideas of the present invention. For those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scopes. This specification should not be understood as a limitation on the present invention.

Claims

1. A method for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals, characterized in that: Using a device built into an electric vehicle battery, the method includes the steps of: S1, if the electric vehicle battery is connected to the charging circuit, receive the GNSS signal, if there is no GNSS signal, turn off the electric vehicle battery charging; if there is a GNSS signal, S2, forwards the GNSS signal vertically above the battery of the electric vehicle and in several evenly distributed horizontal directions; S3, capturing the echo signal of the GNSS forwarding signal, combining the captured echo signal path with a preset indoor judgment model to determine whether the electric vehicle battery is indoors, and if it is indoors, shutting down the charging of the electric vehicle battery; If you are not indoors, plug in the electric vehicle battery to charge; The device comprises: A GNSS signal receiving unit, used for receiving GNSS signals; The signal forwarding and echo capturing unit is used to forward the received GNSS signal vertically above the battery of the electric vehicle and in several evenly distributed horizontal directions, and to capture the echo signal of the GNSS forwarding signal; The signal processing unit is used to combine the captured echo signal path with the preset indoor judgment model to judge whether the electric vehicle battery is indoors, and if it is indoors, turn off the charging of the electric vehicle battery; if it is not indoors, turn on the charging of the electric vehicle battery; The signal processing unit further includes performing a vector tracking process on the GNSS signal received by the GNSS signal receiving unit and then performing a branch process according to a set forwarding path number; The preset indoor judgment model is: if an echo signal is captured vertically above, and the number of echo signals captured horizontally is not less than the set path number threshold, it is judged that the electric vehicle battery is indoors; otherwise, it is judged that the electric vehicle battery is not indoors; The device sends the judgment result of whether the electric vehicle battery is indoors or not indoors to the BMS of the electric vehicle battery, and the BMS executes closing the charging of the electric vehicle battery or opening the charging of the electric vehicle battery; The device also includes performing GNSS positioning on the electric vehicle battery and storing the positioning data.

2. The method for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals according to claim 1 is characterized in that: Before the step S2, the GNSS signal is also subjected to vector tracking processing and then branched according to the set forwarding path number.

3. The method for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals according to claim 2 is characterized in that: The vector tracking process includes: collecting the code phase errors and carrier frequency errors of all channels in the received GNSS signal and performing data filtering to obtain a reference code phase and carrier frequency for subsequent signal tracking and echo capture.

4. The method for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals according to claim 1, characterized in that: The preset indoor judgment model is: if an echo signal is captured vertically above, and the number of echo signals captured horizontally is not less than a set path number threshold, it is judged that the electric vehicle battery is indoors; Otherwise, it is determined that the electric vehicle battery is not indoors.

5. The method for automatically shutting down indoor charging of electric vehicle batteries based on GNSS signals according to claim 1, characterized in that: The method further includes: if there is a GNSS signal, performing GNSS positioning on the battery of the electric vehicle and storing the positioning data.

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