KR20190056069A - Wireless charging system using height adjustment and control method for the wireless charging system - Google Patents

Abstract

The present invention relates to a vehicle height-controlled wireless charging system comprising: a power supplying device provided at a charging site for charging a vehicle; a current collecting device provided in the vehicle for charging a battery of the vehicle in response to the power supplying device; a vehicle height control unit provided in the vehicle and for controlling the height of the vehicle; and a wireless charging controller for controlling charging of the battery by controlling the current collecting device and the vehicle height control unit.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless charging system and a control method thereof,

The following embodiments relate to a vehicle height control type wireless charging system capable of wirelessly charging a vehicle and a control method thereof.

An electric car is an electric powered vehicle that appeared in the late 1880s and was used for passenger cars, trucks, and buses. Electric vehicles, as early as the automobile industry in the 1920s, due to relatively low speeds and battery recharging did not become a big problem in limited mileage, so luxury cars used in the city, And were in competition. Over time, however, electric vehicles have begun to be pushed out of competition with oil-fueled automobiles due to battery charging problems.

In recent years, interest in electric vehicles has been increasing in various countries around the world in order to reduce carbon dioxide emissions from environmental pollution. In addition, much effort is being devoted to the activation of electric vehicles by constructing infrastructures such as the installation of charging stations to recharge the batteries.

Conventional electric vehicles generally use wired wires and connectors to charge the battery. However, there is a problem that the standard of the charging connector is different according to each vehicle type or vehicle maker, so that it can not be used in common, there is a danger of electric shock in charging, and inconvenience in charging operation due to connection and disconnection of the connector there was.

Problems that occur when charging an electric vehicle with such a wire can be solved by applying a wireless charging method. However, the wireless charging method of electric vehicles has not yet been widely used. In order to commercialize the wireless charging of an electric vehicle, it is necessary to solve the problem of securing the charging capacity, electric power transmission efficiency and safety.

The electric vehicle charging system converts the high frequency induction magnetic field generated from the high frequency alternating current supplied through the feed line of the power feeding device to a direct current from the current collector installed in the lower portion of the vehicle to charge the battery. As such, the charging system is referred to as a contactless power supply (CPS) because it transmits power by magnetic coupling without electrical or mechanical contact.

The electric power transmission through the non-contact power transmission device is performed when the electric vehicle is stopped, such as when the electric vehicle is stopped or parked. However, the charging and power transmission efficiency is not high yet. In addition, there is a problem that the peripheral device becomes large in order to achieve the desired amount of charge in a short time. Therefore, it is urgent to develop a power transmission device that is efficient and does not cause a large peripheral device. Also, it should be considered that it can be applied without changing the structure of the existing electric vehicle.

The contents described as the background art described above are possessed or acquired by the inventor in the derivation process of the present invention and can not be regarded as a known technology disclosed in the general public before the application of the present invention.

According to embodiments, a garage-controlled wireless charging system and a control method thereof that can charge a vehicle wirelessly are disclosed.

The tasks to be solved in the embodiments are not limited to the above-mentioned tasks, and other tasks not mentioned can be clearly understood by those skilled in the art from the following description.

According to embodiments of the present invention for achieving the above object, there is provided a vehicle height control type wireless charging system including a power feeding device provided in a charging site for charging a vehicle, A power accumulating device for charging a battery of the vehicle, a garage height adjusting device for adjusting the height of the vehicle, and a wireless charging controller for controlling charging of the battery by controlling the power accumulating device and the height adjusting device .

According to one aspect of the present invention, the vehicle is provided with an electric vehicle control unit (EVCU) for detecting the car height information and the position information of the vehicle, and the radio charging controller receives the garage information from the electric vehicle control unit And the charging of the battery can be controlled by receiving the position information.

According to one aspect, the wireless charging controller can adjust the garage of the vehicle in real time while the battery is being charged. The wireless charging controller may monitor the current collection state of the battery to lower the garage when the required current value of the battery is high and to increase the garage when the requested current value is low. The wireless charging controller may adjust a garage on the side of the vehicle on which the power collector is provided or adjust the garage of the entire vehicle. The wireless charging controller may control the position of the vehicle so that the current collecting device is located at a position corresponding to the power feeding device.

According to one aspect, the height adjustment portion may be provided on the front wheel, the rear wheel, or each wheel of the vehicle.

According to one aspect of the present invention, the height adjuster may be a variable suspension using an electromagnetic induction phenomenon. Alternatively, the height adjuster may be a pneumatic variable suspension using air pressure.

According to another aspect of the present invention, there is provided a method of controlling a garage-controlled wireless charging system, the method comprising: receiving information on a charging standby state; receiving location information of the vehicle and receiving garage information; , Adjusting the height of the vehicle to a maximum height, charging the battery of the vehicle while adjusting the height of the vehicle, terminating the charging, and returning the garage of the vehicle to the state before charging .

According to one aspect of the present invention, in the charging step, a voltage and a current of a power source input to a power collector provided in the vehicle are measured, a voltage and a current value of the battery are checked, The control unit may control the garage to be supplied. In the step of adjusting the garage, the garage may be lowered when the demanded current value of the battery is high, and the garage may be increased when the demanded current value is low.

According to one aspect of the present invention, in the charging termination step, the height of the garage is adjusted to the maximum height so that the charging can be terminated by recognizing the charging device as no-load.

As described above, according to the embodiments, the amount of current can be actively controlled in real time by controlling the garage. In addition, since the wireless charging controller replaces the role of a general regulator, it can be implemented in a smaller size and at a lower cost than a regulator.

The effects of the garage-controlled wireless charging system and its control method according to an embodiment are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description, serve to further the understanding of the technical idea of the invention, It should not be construed as limited.
FIG. 1 is a schematic diagram of a garage-controlled wireless charging system according to an embodiment.
2 is a schematic view of a vehicle according to one embodiment.
3 is a schematic diagram of a garage-adjustable wireless charging system in accordance with an embodiment.
FIG. 4 is a flowchart illustrating a control method of a vehicle height control type wireless charging system according to an exemplary embodiment of the present invention. Referring to FIG.

Hereinafter, embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments, detailed description of known functions and configurations incorporated herein will be omitted when it may make the best of an understanding clear.

In describing the components of the embodiment, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be " connected, " " coupled, " or " connected. &Quot;

Hereinafter, a vehicle height control type wireless charging system 100 according to embodiments will be described with reference to FIGS. 1 to 3. FIG.

2 is a schematic diagram of a vehicle 30 in accordance with one embodiment, and Fig. 3 is a schematic view of a garage-controlled wireless charging system 100 in accordance with one embodiment. In Fig. ≪ RTI ID = 0.0 & Figure 2 is a schematic diagram of an adjustable wireless charging system 100;

In the following description, the term " vehicle " includes a vehicle having a rechargeable battery 34. [ The vehicle 30 is not limited to an electric vehicle, and may be a variety of vehicles including an eco-friendly vehicle, a mini-tram, a small shuttle bus, a Personal Rapid Transit (PRT) Transportation means.

The vehicle 30 includes a frame 31 including an axle and a wheel 32. Here, the frame 31 includes a frame of the vehicle 30 such as an axle and a chassis. In the following embodiments, only a partial configuration of the vehicle 30 is shown and described, but this is for convenience of explanation. The vehicle 30 and the frame 31 may include all the configurations of the vehicle 30 .

The vehicle 30 is provided with an electric vehicle control unit (EVCU) 42, which is provided with a rechargeable battery 34 that supplies power for driving, and controls the operation of the vehicle 30 . In addition, a garage adjuster 33 for adjusting the height of the vehicle 30 is provided on one side of the vehicle 30.

The height adjuster 33 is provided on one side of the frame 31 and is adjustable to adjust the height of the vehicle 30. For example, the height adjuster 33 may be provided on any one of the front wheel or the rear wheel of the vehicle 30, or may be provided on all the wheels. In addition, although the height adjuster 33 is illustrated as being capable of adjusting the height of the four wheels 32, the number of the height adjusters 33 can be varied substantially. Here, the height adjuster 33 is provided to adjust the height of a position where the current collector (or the rectifier) 10 or the current collector pad 11 is provided at least in the vehicle 30. [

The height adjuster 33 may be a variable suspension using an electromagnetic induction phenomenon. The vehicle height control unit 33 is constituted by a piezoelectric element, generates electricity when pressure is applied, and generates the height information of the vehicle 30 from the electric vehicle control unit 42 by the electric signal thus generated. In addition, the garage height adjuster 33 adjusts the garage height by the electric power applied from the electric vehicle control unit 42.

However, this is merely an example, and the vehicle height adjusting section 33 may be practically various means capable of adjusting the height of the vehicle 30. For example, the height adjuster 33 may be a pneumatic variable suspension.

The wireless charging system 100 includes a power collecting device 10 provided in the vehicle 30 and a power feeding device 20 provided in a charging site for charging. The wireless charging system 100 is also provided on one side of the vehicle 30 to control the charging of the battery 34 and to monitor the current collection state of the battery 34 while the battery 34 is being charged, 30). Here, the wireless charging system 100 actively controls the output voltage of the wireless charging system 100 by adjusting the distance between the current collecting apparatus 10 and the power supplying apparatus 20 by using the adjusting unit 33 .

The current collector 10 includes a current collecting pad 11 disposed under the vehicle 30. When the current collector 10 enters the charging site, the power collector 20 operates to charge the battery 34. [

The power feeding device 20 includes a power feeding pad 21 embedded in or disposed at a predetermined depth in a charging site and a high frequency power source 22 for applying power to the power feeding pad 21. [

The electric power is collected from the current collecting pad 11 in a noncontact manner and wirelessly through the self resonance induction method by the electric power generated in the electric power feeding device 20 and the AC electric power is converted into the DC electric power by the current collecting device 10, And the battery 34 to the voltage and current required to supply electricity.

At this time, the magnetic field generated as the feed current depends on the amount of radio power transmission and the magnitude of the voltage according to Ampere's law. That is, the intensity of the electromagnetic wave has a close relationship with distance. Accordingly, the wireless charging system 100 realizes the step-up / down function of the output voltage to be charged through the wireless charging system 100 by controlling the garage using the garage adjuster 33 in the wireless charging controller 41 . That is, as the wireless charging controller 41 adjusts the height of the vehicle 30, it realizes the active control in the current collector 10 in real time and can act as a regulator. When the wireless charging controller 41 controls the output voltage through the vehicle height controller 33, the wireless charging controller 41 replaces the regulator, so that the parts of the wireless charging system 100 mounted on the vehicle 30 And the cost can be reduced.

Hereinafter, with reference to FIG. 4, a method of controlling the vehicle height control type wireless charging system 100 will be described. For reference, FIG. 4 is a flowchart for explaining a control method of the vehicle height adjustable wireless charging system 100 according to an embodiment.

First, the wireless charging system 100 confirms whether the vehicle 30 has entered the charging site and is in a charging standby state (S11).

Next, when the vehicle 30 is in a charge waiting state, the wireless charging controller 41 receives the position information of the vehicle 30 and the garage information from the electric vehicle control unit 42 (S12).

The wireless charging controller 41 also receives information on the state of the battery 34 from the electric vehicle control unit 42 and the required current required by the battery 34. [

The wireless charging controller 41 also interacts with the electric vehicle control unit 42 to check the position of the vehicle 30 and determine the position of the vehicle so that the positions of the current collector 10 and the power feeding device 20 are matched Can be adjusted.

Next, the wireless charging controller 41 adjusts the height of the vehicle 30 to the maximum height by using the height adjusting portion 33 of the vehicle 30 (S13).

Next, the wireless charging controller 41 charges the battery 34 wirelessly while adjusting the height of the vehicle 30.

Here, while charging the battery 34, the voltage and the current of the power source inputted to the current collector 10 provided in the vehicle 30 are measured and charged while checking the voltage and current value of the battery 34 (S14).

In step S15, the wireless charging controller 41 adjusts the garage so that power is supplied to the battery 34 at a required current value. That is, when the current value of the battery 34 is low, the wireless charging controller 41 lowers the garage to increase the voltage and the current value to supply more power. When the current value is high The power supplied is reduced by increasing the garage. As described above, the wireless charging system 100 can adjust the intensity of the charging voltage by controlling the garage in real time. In addition, since the wireless charging system 100 monitors the charged amount of the battery 34 in real time and adjusts the height of the vehicle 30, the charging amount in the current collecting apparatus 10 can be actively controlled in real time.

Next, when the charging of the battery 34 is completed (S16), the wireless charging controller 41 adjusts the height of the garage to the maximum height (S17).

If the height of the vehicle 10 is raised to the maximum level in the wireless charging controller 41, the charging amount is rapidly reduced due to the reduction of the magnetic field. Accordingly, on the side of the feeding device 20, this state is recognized as no- .

Finally, when charging of the battery 34 is completed, the wireless charging controller 41 returns the garage of the vehicle 30 to the state before charging through the garage adjuster 33 (S18). When charging of the battery 34 is completed, the wireless charging controller 41 returns the garage to the state before charging so that the vehicle can travel.

According to the embodiments, the regulator required in the existing wireless charging system is omitted and the wireless charging controller 41 controls it. Therefore, the wireless charging controller 41 does not need cooling as compared with the regulator, and it is possible to downsize and reduce the cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments and equivalents to the claims are within the scope of the following claims.

10: Current collector (rectifier)
11: collecting pad
20: Feeding device
21: Feed pad
22: High frequency power source
30: vehicle
31: Frame
32: Wheel
33:
34: Battery
41: Wireless charging controller
42: electric vehicle control unit (EVCU)
100: Wireless charging system

Claims (13)

A power supply device provided at a charging site for charging the vehicle;
A current collecting device provided in the vehicle for charging the battery of the vehicle in response to the power feeding device;
A garage adjuster provided in the vehicle for adjusting a garage of the vehicle; And
A charge controller for controlling charge of the battery by controlling the current collector and the charge controller;
And a controller for controlling the charging system.
The method according to claim 1,
The vehicle is provided with an electric vehicle control unit (EVCU) for detecting the height information and the position information of the vehicle,
Wherein the wireless charging controller receives the garage information and the location information from the electric vehicle control unit to control charging of the battery.
3. The method of claim 2,
Wherein the wireless charging controller adjusts the garage of the vehicle in real time while the battery is being charged.
The method of claim 3,
Wherein the wireless recharge controller comprises:
Wherein the control unit monitors the current collection state of the battery to control the garage to be lowered when the required current value of the battery is higher and to raise the garage when the required current value is lower.
The method of claim 3,
Wherein the wireless recharge controller comprises:
And controlling the garage on the side of the vehicle on which the current collecting device is provided or adjusting the garage of the entire vehicle.
3. The method of claim 2,
Wherein the wireless recharge controller comprises:
And controls the position of the vehicle so that the current collector positions the vehicle at a position corresponding to the power feeding device.
The method according to claim 1,
Wherein the garage height adjusting unit is provided on the front wheel, rear wheel, or each wheel of the vehicle.
The method according to claim 1,
Wherein the garage height adjusting unit is a variable suspension using an electromagnetic induction phenomenon.
The method according to claim 1,
Wherein the garage height adjuster is a pneumatic variable suspension using pneumatic pressure.
Receiving information on a charging standby state;
Receiving location information of a vehicle and garage information;
Adjusting a height of the vehicle height to a maximum height;
Charging the battery of the vehicle while adjusting the height of the vehicle;
Terminating charging; And
Returning the garage of the vehicle to a state before charging;
And a control unit for controlling the vehicle.
11. The method of claim 10,
In the charging step,
Measuring a voltage and a current of a power source input to a current collector provided in the vehicle;
Checking voltage and current values of the battery; And
Adjusting a garage so that power is supplied at a required current value of the battery;
And a control unit for controlling the vehicle.
12. The method of claim 11,
In the step of adjusting the garage,
Wherein the control unit lowers the garage when the required current value of the battery is high and increases the garage when the requested current value is low.
11. The method of claim 10,
In the charging end step,
And controlling the height of the garage to a maximum height so that charging is terminated by recognizing the load on the power feeding device side as no load.

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