KR20230107481A - Left-right alignment method and device for wireless charging using camera - Google Patents

Abstract

The present invention relates to a left-right alignment method and device for wireless charging, and more specifically, to a left-right alignment method and device for wireless charging using a camera, which do not require an additional sensing device for complex alignment inside an electric vehicle and ensure simplicity and lightweightness. The left-right alignment method for wireless charging according to the present invention comprises the steps of (a) receiving image information indicating a ground assembly (GA) obtained from a camera; (b) recognizing a charging slot by obtaining identification information from the image information indicating the ground assembly (GA), input in the step (a); and (c) obtaining entry direction information into the charging slot from the image information indicating the ground assembly (GA), input in the step (a).

Description

Left-right alignment method and device for wireless charging using camera {Left-right alignment method and device for wireless charging using camera}

The present invention relates to a left-right alignment method and device for wireless charging, and more particularly, to a left-right alignment method and device for wireless charging using a camera.

An electric vehicle (EV), which has been recently developed, drives a motor with battery power, and has fewer air pollutants such as exhaust gas and noise than conventional gasoline engine vehicles, has fewer breakdowns, has a longer lifespan, and operates It has the advantage of simple operation. Electric vehicles are classified into hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (EVs) according to driving sources. HEVs have an engine for main power and a motor for auxiliary power. PHEVs have a main powered motor and an engine that is used when the battery is discharged. An EV has a motor, but no engine. Wireless charging of a battery for driving a motor of an electric vehicle may be performed by coupling a primary coil of a charging station and a secondary coil of the electric vehicle through a magnetic resonance method. In addition, in the self-resonant wireless power transmission system, if the primary coil and the secondary coil are not aligned, the efficiency of wireless power transfer can be greatly reduced. may be requested.

The left-right alignment method for conventional wireless charging was supported through a low-frequency sensing (LF) or low-power sensing (LPE) method for an electric vehicle. However, low-frequency sensing and low-power sensing methods are supported by mounting sensors inside or outside the electric vehicle, and when a sensor sensitive to a magnetic field is damaged, maintenance is difficult and maintenance items increase, so additional costs increase accordingly. In addition, since a separate power operation must be performed, there is a problem in that operation complexity or power waste occurs.

KR 10-2021-0109446 A

The present invention was invented to solve this problem, and a method and apparatus for left-right alignment of wireless charging using a camera that is simple and lightweight without additionally requiring a sensing device for complex alignment inside an electric vehicle. Its purpose is to provide

In order to achieve the above object, a left-right alignment method of wireless charging using a camera according to the present invention includes the steps of receiving image information indicating a ground assembly (GA) obtained from a camera; Recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); and obtaining entry direction information into the charging slot from image information indicating a ground assembly (GA) received in step (a).

After the step (b), a step of providing a guide so that the vehicle assembly (VA) moves in the obtained entry direction is further included.

The image information indicating the Ground Assembly (GA) is a 3x3 lattice block mark, and a triangle is displayed on one of the 3x3 lattice blocks.

The identification information in step (b) is obtained in an 8-bit array by identifying the colors of the remaining blocks except for one block in the middle from the upper left of the 3×3 grid block.

The last of the eight bit arrays is a parity bit.

In step (c), vehicle assembly (VA) access direction information is acquired in such a way that the triangle displayed in the middle block of the 3×3 grid block has a base and a height angle of 90 degrees.

Another aspect of the present invention for achieving the same object is a device for left and right alignment of wireless charging using a camera, including at least one processor; and at least one memory storing computer-executable instructions, wherein the computer-executable instructions stored in the at least one memory cause the at least one processor to: (a) a ground assembly obtained from a camera; Receiving image information indicating (GA; Ground Assembly); (b) recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); And, (c) the left and right of wireless charging using a camera so that the step of obtaining the entry direction information into the charging slot from the image information indicating the ground assembly (GA) received in step (a) is executed sorting device.

Another aspect of the present invention for achieving this object is a computer program for left and right alignment of wireless charging using a camera, stored in a non-transitory storage medium, by a processor, (a) a ground assembly obtained from the camera Receiving image information indicating (GA; Ground Assembly); (b) recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); And, (c) using a camera including a command for executing the step of obtaining information on the entry direction into the charging slot from the image information indicating the ground assembly (GA) received in step (a). A computer program for left-right alignment of wireless charging.

According to the present invention, it is possible to reduce vehicle management items by using a camera or ADAS system mounted on a vehicle without having low frequency sensing (LF) or low power sensing (LPE) for complex multiple alignment methods, and It has the effect of eliminating maintenance caused by built-in.

1 is a conceptual diagram for explaining a wireless charging concept for an electric vehicle to which an embodiment of the present invention is applied.
2a to 2b are views for explaining left-right alignment of wireless charging using a camera according to an embodiment of the present invention.
Figure 3 is a diagram schematically showing an apparatus for performing left-right alignment of wireless charging using a camera according to an embodiment of the present invention.
4 is a flowchart illustrating a left-right alignment method of wireless charging using a camera according to an embodiment of the present invention.
5 is a view for explaining a method of obtaining entry direction information in the method of arranging wireless charging using a camera according to FIG. 4;

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. The same or similar reference numerals are given to the same or similar components, and overlapping descriptions thereof will be omitted. In describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. The accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and technical scope of the present invention It should be understood to include being or replacing.

Terms including ordinal numbers, such as first, second, etc., may be used to describe various elements, but these terms are used only for the purpose of distinguishing one element from another element, and the corresponding elements are those terms. not limited by Expressions in the singular number include plural expressions unless the context clearly dictates otherwise.

Terms such as "comprises", "includes" or "has" used herein should be understood to limit the presence of features, steps, elements or combinations thereof described in the specification, and one or more other It is not intended to exclude the possibility that features, steps, components, or combinations thereof may be present or added.

It is understood that when an element is described as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but another element may exist in the middle. It should be. On the other hand, when a component is referred to as “directly connected” or “directly connected” to another component, it should be understood that no other component exists in the middle.

1 is a conceptual diagram for explaining a concept of wireless charging for an electric vehicle to which an embodiment of the present invention is applied.

Referring to FIG. 1 , wireless charging may be performed by at least one component of an electric vehicle (10) and a charging station (22), in order to wirelessly transmit power to the electric vehicle (10). can be used Here, the electric vehicle 10 may generally be defined as a vehicle (automobile) that supplies current induced from a rechargeable energy storage device such as a battery (not shown) as an energy source for an electric motor, which is a power unit. However, the electric vehicle 10 according to the present invention may include a hybrid vehicle having both an electric motor and a general internal combustion engine, and the electric vehicle 10 may wirelessly charge a battery with a receiving coil. It may include a receiving pad (not shown) included therein. Here, the charging station 22 may be connected to a power grid 30 or a power backbone, and an alternating current (AC) is supplied to the transmission pad 21 including the transmission coil through a power link. Alternatively, direct current (DC) power may be provided. In addition, the charging station 22 can communicate with a power grid 30 or an infrastructure management system or infrastructure server that manages the power grid through wired or wireless communication, and performs wireless communication with the electric vehicle 10 can do. Here, wireless communication may include Bluetooth, zigbee, cellular, wireless local area network, and the like. In addition, for example, the charging station 22 may be located in various places, such as a parking lot attached to the house of the owner of the electric vehicle 10, a parking area for charging an electric vehicle at a gas station, a shopping center, or a parking area at a workplace. Here, in the process of wireless charging the battery of the electric vehicle 10, first, the receiving pad of the electric vehicle 10 is located in the energy field by the transmitting pad 21, and the transmitting coil and the receiving pad of the transmitting pad 21 It can be performed by the receiving coils of the interaction or coupling with each other. As a result of interaction or coupling, electromotive force is induced in the receiving pad, and the battery may be charged by the induced electromotive force. In addition, all or part of the charging station 22 and the transmission pad 21 may be referred to as a Ground Assembly (GA) 20, which includes a GA coil and other suitable parts to It may refer to an assembly deployed on the infrastructure side. Other suitable components may include at least one component for controlling impedance and resonant frequency, ferrite and electromagnetic shielding material for enhancing a magnetic path. For example, a GA may include a power/frequency conversion device necessary to function as a power source for a wireless charging system, a GA controller, and wiring from the grid and wiring between each unit and filtering circuits, housing, and the like. In addition, all or part of the receiving pad of the electric vehicle 10 and other internal components of the electric vehicle may be referred to as a vehicle assembly (VA), where the vehicle assembly includes a VA coil and other appropriate parts disposed in the vehicle. can refer to an assembly that is Other suitable components may include at least one component for controlling impedance and resonant frequency, ferrite and electromagnetic shielding material for strengthening the magnetic path. For example, the VA may include wiring between each unit and filtering circuits, housing, etc., as well as wiring of the rectifier/power converter and VA controller and vehicle battery necessary to function as a vehicle component of the wireless charging system. . Here, the transmission pad or the reception pad may be non-polarized or polarized. At this time, if the pad is non-polar, one pole may be present in the center of the pad, and the opposite pole may be located on the outer periphery of the pad. Here, the flux may be formed to exit at the center of the pad and return at all outer edges of the pad. Also, if the pad is polar, it may have a respective pole at either end of the pad. Here, the magnetic flux may be formed based on the orientation of the pad.

2A to 2B are views for explaining left-right alignment of wireless charging using a camera according to an embodiment of the present invention.

First, FIG. 2A shows that a vehicle assembly (VA) 10 enters a ground assembly (GA) 20 for wireless charging. At this time, cameras or ADAS systems are mounted at different locations in the Vehicle Assembly (VA) 10 to obtain image information according to the mounting locations. At this time, image information indicating the Ground Assembly (GA) 20 is acquired among image information. The image information indicating the Ground Assembly (GA) 20 is a Ground Assembly (GA) ) (20) or a ground assembly (GA; Ground Assembly) 20 is drawn on the buried surface to become image information. In the image information displaying the Ground Assembly (GA) 20, there is information on a grid block marker 25 made of 3 × 3, and one block among the grid block markers 25 made of 3 × 3 A triangular figure 26 is displayed so that the camera acquires the grid block mark 25. The grid block marker 25 made of 3×3 is displayed in one color of white or black, respectively. The lattice block mark 25 is a means for recognizing that the Ground Assembly (GA) 20 is a charging slot for wireless charging, and is a means of recognizing that the Vehicle Assembly (VA) 10 is a charging slot for stopping. location can be identified. Here, the vehicle assembly (VA) 10 may obtain identification information from the grid block mark 25, and the method of obtaining the remaining blocks except for one block in the middle from the upper left of the 3 × 3 grid block. The color of is identified, and the identified color is obtained as an 8-bit array. For example, if the block color is white, it is identified as '1', and if the block color is black, it is identified as '0'. For reference, the identification information for the grid block mark 25 of FIGS. 2A and 2B is '10110011'. Here, the last bit of the 8 bits is a parity bit. If the number of identification information 1 is an even number, the parity bit is '1', and if the number of 1's is an odd number, the parity bit is identified as '0'. Meanwhile, among the 3×3 grid block markers 25, the middle block is displayed as a triangular figure 26, which is distorted according to the position of the direction in which the vehicle assembly (VA) 10 enters. obtained in the shape of a triangle. At this time, the distorted triangular shape is obtained in a direction in which the angle of the base and height of the triangle is 90 degrees, and the direction in which the vehicle assembly (VA) 10 should enter is extracted. At this time, the extracted entry direction is provided and used as a guide for left-right alignment. Accordingly, in FIG. 2A , a vehicle assembly (VA) 10 is entering the ground assembly (GA) 20 and a triangular figure 26 aligned left and right, and FIG. 2B shows a vehicle assembly. Since the (Vehicle Assembly (VA) 10 is biased to the right with respect to the Ground Assembly (GA) 20, the camera mounted on the Vehicle Assembly (VA) 10 at the skewed position has a triangular shape. When the figure 26 is acquired, the angle of the triangular figure 26 is calculated in a direction in which the angle between the base and the height of the triangle becomes 90 degrees. Then, left-right alignment of the vehicle assembly (VA) 10 is provided as a direction guide using the calculated angle.

3 is a diagram schematically illustrating an apparatus for performing left-right alignment of wireless charging using a camera according to an embodiment of the present invention.

A left-right alignment device for wireless charging using a camera according to an embodiment of the present invention includes a processor 110, a non-volatile storage unit 120 for storing programs and data, a volatile memory 130 for storing running programs, and other devices. It consists of a communication unit 140 for performing communication with and a bus, which is an internal communication path between these devices, etc. Programs in execution may include device drivers, operating systems, and various applications. Although not shown, the electronic device includes a power supply unit such as a battery.

The left and right alignment application 220 of wireless charging receives the image information of the Ground Assembly (GA) obtained from the camera, and obtains identification information from the image information of the received Ground Assembly (GA) Recognize the charging slot. And it plays a role of obtaining entry direction information of a vehicle assembly (VA) from the input image information of a ground assembly (GA). This left-right alignment application 220 of wireless charging is a program installed and operating in the left-right alignment device 100 of wireless charging using a camera, and wireless charging using a camera by the operation of the left-right alignment application 220 of wireless charging. The left-right alignment method of will be described later in detail with reference to FIGS. 4 and 5 .

4 is a flowchart illustrating a left-right alignment method of wireless charging using a camera according to an embodiment of the present invention, and FIG. 5 is a method for obtaining entry direction information in the left-right alignment method of wireless charging using a camera according to FIG. 4 It is a drawing for explanation.

Referring to FIG. 4 , first, image information indicating a Ground Assembly (GA) obtained from a camera is received (S210).

Then, the charging slot is recognized by obtaining identification information from the image information indicating the ground assembly (GA) received in step S210 (S220). Here, in the image information indicating Ground Assembly (GA), there is a 3x3 lattice block mark, and a triangle is displayed on one of the 3x3 lattice blocks. At this time, the identification information is obtained by identifying the color of the remaining blocks except for one block in the middle from the upper left of the 3 × 3 grid block. The color of the identified block is acquired as an 8-bit array do. For example, if the block color is white, it is identified as '1', and if the block color is black, it is identified as '0'. Here, the last bit among the 8 bits is identified as a parity bit, and if the number of 1's in the identification information is even, the parity bit is '1', and if the number of 1's is odd, the parity bit is '0'. Acquire The location of the charging slot and charging slot information can be recognized through the obtained identification information.

In addition, the entry direction information of the vehicle assembly (VA) is obtained from the image information indicating the ground assembly (GA) received in step S210 (S230). At this time, entry direction information is acquired by a triangle displayed in the middle block of the 3×3 grid block. The triangle is obtained in a distorted form according to the position of the direction in which the vehicle assembly (VA) enters, and based on the distorted triangle, the vehicle assembly is aligned left and right in a direction in which the angle of the base and height of the triangle becomes 90 degrees. Get the entry direction.

Thereafter, a guide is provided so that the vehicle assembly (VA) moves in the obtained entry direction (S240).

FIG. 5 is a view for explaining a method of obtaining entry direction information in the left-right alignment method of wireless charging using a camera according to FIG. The entry direction of the vehicle assembly 10 with respect to the base is set as the y-axis, and the direction perpendicular to the y-axis is set as the x-axis. In addition, let x 1 denote a perpendicular line drawn to the x-axis with respect to vertex ₁ of the base of the triangle 26, and x ₂ to denote a perpendicular line drawn to the x-axis with respect to vertex 2 of the base of the triangle 26. And when the perpendicular drawn down to the y-axis with respect to the vertex 1 of the base of the triangle 26 is y ₁ and the perpendicular drawn down to the y-axis with respect to the vertex 2 of the base of the triangle 26 is y ₂ , the triangle viewed from the vehicle assembly 10 The base of is dx and the height is dy. In this case, dx is an absolute value obtained by subtracting x ₂ from x ₁ , and dy can be expressed as an absolute value obtained by subtracting y ₂ from y ₁ . Thereafter, a triangular angle viewed from the current vehicle assembly position is calculated using the arctangent function of the calculated dx and dy, and entry direction information of the vehicle assembly is obtained in a direction in which the calculated angle is reflected. Using this acquired direction information, it is provided as a movement guide for the vehicle assembly, so that the vehicle assembly is left and right aligned with the ground assembly (GA).

As described above, although the present invention has been described by the limited embodiments and drawings, the present invention is not limited thereto, and the technical spirit of the present invention and the following by those skilled in the art to which the present invention belongs Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

10: Vehicle Assembly (VA)
20: Ground Assembly (GA)
25: grid block marker
26: triangle figure
27: Last block
100: left and right alignment device for wireless charging using camera
110: processor
120: storage unit
130: memory
140: communication department
220: Left-right alignment application of wireless charging

Claims (8)

As a left-right alignment method of wireless charging using a camera,
(a) receiving image information indicating a ground assembly (GA) obtained from a camera;
(b) recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); and,
(c) obtaining information on an entry direction into the charging slot from image information indicating a ground assembly (GA) received in step (a);
Left-right alignment method of wireless charging using a camera comprising a. The method of claim 1,
After step (b),
Providing a guide so that a vehicle assembly (VA) moves in the obtained entry direction.
Left-right alignment method of wireless charging using a camera further comprising. The method of claim 1,
The image information indicating the ground assembly (GA) is a 3x3 lattice block mark, and a triangle is displayed on one of the 3x3 lattice blocks.
Left-right alignment detection method of wireless charging using a camera, characterized in that. The method of claim 1,
The identification information of step (b) is,
From the upper left of the 3 × 3 grid block, identifying the color of the remaining blocks except for one block in the middle and obtaining them in an 8-bit array
Method for detecting left-right alignment of wireless charging using a camera, characterized in that The method of claim 3,
The last of the eight bit arrays is a parity bit
Left-right alignment detection method of wireless charging using a camera, characterized in that. The method of claim 1,
Acquisition of entry direction information of the vehicle assembly (VA) in step (c) is obtained in a direction in which the angle of the base and height of the triangle displayed in the middle block of the 3 × 3 grid block is 90 degrees.
Left-right alignment method of wireless charging using a camera, characterized in that. As a device for left and right alignment of wireless charging using a camera,
at least one processor; and
including at least one memory for storing computer-executable instructions;
The computer-executable instructions stored in the at least one memory are, by the at least one processor,
(a) receiving image information indicating a ground assembly (GA) obtained from a camera;
(b) recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); and,
(c) obtaining information on an entry direction into the charging slot from image information indicating a ground assembly (GA) received in step (a);
A left-right alignment device for wireless charging using a camera that enables As a computer program for left-right alignment of wireless charging using a camera,
It is stored in a non-transitory storage medium, and by the processor,
(a) receiving image information indicating a ground assembly (GA) obtained from a camera;
(b) recognizing a charging slot by obtaining identification information from image information indicating a ground assembly (GA) received in step (a); and,
(c) obtaining information on an entry direction into the charging slot from image information indicating a ground assembly (GA) received in step (a);
A computer program for left-right alignment of wireless charging using a camera including a command to execute.

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