Vehicle and power supply device

Abstract

The invention provides a vehicle and a power supply device which can safely continue charging even if wireless communication between a vehicle side and a ground side is interrupted in non-contact power transmission between a coil on the vehicle side and a coil on the ground side. A vehicle is provided with: a power reception coil that receives power transmitted in a non-contact manner from a ground-side power transmission coil; a storage battery for storing the power received by the power receiving coil; a control device that performs charging control; and a communication device that performs wireless communication with the ground-side device, in which the control device confirms the relationship between the number of devices using the other frequency bands and the radio wave intensity before an abnormality in communication with the ground-side device occurs, performs channel sorting on the basis of the confirmation result, and performs channel sorting on the basis of the confirmation result when communication with the ground-side device is interrupted during charging. And attempting to reconnect with the ground-side device of which the communication is interrupted in the order of the sorted channels.

Description

Technical Field

[0001] The invention relates to a vehicle and a power supply device. Background Art

[0002] Patent document 1 discloses the following: In a contactless charging system that transmits power from a ground-side power supply device to a vehicle in a contactless manner, if communication between the ground-side device and the vehicle is interrupted during contactless charging, charging is continued in the communication interruption state using information received during communication.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-030049 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the configuration described in Patent Document 1, even if communication is interrupted during charging, power transmission can be continued using information acquired during communication. However, as time passes, the reliability of information becomes less reliable, and the risk of overcharging increases.

[0008] The present invention is completed in view of the above situation, and its purpose is to provide a vehicle and a power supply device that can safely continue charging even if the wireless communication between the vehicle side and the ground side is interrupted during the non-contact power transmission between the coil on the vehicle side and the coil on the ground side.

[0009] Technical solutions to solve problems

[0010] The vehicle involved in the present invention comprises: a receiving coil for receiving electric power transmitted from a power transmission coil on the ground side in a non-contact manner; a battery for storing the electric power received by the power receiving coil; a control device for performing charging control for supplying the electric power transmitted from the power transmission coil to the power receiving coil in a non-contact manner to the battery; and a communication device for performing wireless communication with a ground-side device including the power transmission coil. The vehicle is characterized in that the control device confirms the relationship between the number of devices using other frequency bands different from the frequency band used in wireless communication with the ground-side device and the radio wave strength of the other frequency bands before a communication abnormality occurs between the ground-side device and the communication device, and sorts the channels of the other frequency bands based on the confirmation result, and in the case where the communication with the ground-side device is interrupted during charging using the electric power supplied from the power transmission coil, attempts to reconnect with the ground-side device whose communication is interrupted in the order of the sorted channels.

[0011] The power supply device of the present invention comprises: a power transmission coil, which is arranged on the ground; a control device, which controls the power transmission from the power transmission coil to the power receiving coil mounted on the vehicle in a non-contact manner; and a communication device, which performs wireless communication with the vehicle. The power supply device is characterized in that the control device confirms the relationship between the number of devices using other frequency bands different from the frequency band used in the wireless communication with the vehicle and the radio wave strength of the other frequency bands before a communication abnormality occurs between the vehicle and the communication device, and sorts the channels of the other frequency bands according to the confirmation result. In the event that the communication with the vehicle is interrupted during the transmission of power from the power transmission coil to the power receiving coil, the control device attempts to reconnect with the vehicle whose communication is interrupted in the order of the sorted channels.

[0012] Effects of the Invention

[0013] In the present invention, even if wireless communication between the vehicle side and the ground side is interrupted during contactless power transmission between the coil on the vehicle side and the coil on the ground side, charging can be continued safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram showing a non-contact charging system in an embodiment.

[0015] Figure 2 It is an explanatory diagram showing frequency bands and channels.

[0016] Figure 3 : is a flowchart showing the charging control flow. DETAILED DESCRIPTION

[0017] Hereinafter, a vehicle and a power supply device in an embodiment of the present invention will be described in detail. In addition, the present invention is not limited to the embodiment described below.

[0018] Figure 1 1 is a schematic diagram showing a non-contact charging system in an embodiment. The non-contact charging system 1 is a system including a ground-side device 2 and a vehicle 3. In the non-contact charging system 1, non-contact power transmission can be performed from a coil of the ground-side device 2 to a coil of the vehicle 3 when the vehicle 3 is parked.

[0019] The ground-side device 2 is a ground device that supplies power to the vehicle 3. For example, the ground-side device 2 is installed in a parking lot of a commercial facility, a parking lot of a home, etc. The ground-side device 2 includes a power supply device 10. The power supply device 10 is a device that transmits power to the vehicle 3 in a non-contact manner. An AC power supply is connected to the power supply device 10. The AC power supply is composed of a commercial power supply, a household power supply, etc., and supplies power to the power supply device 10.

[0020] The power supply device 10 includes a power transmission coil 11 , a power transmission unit 12 , a wall box 13 , a power transmission ECU 14 , and a communication device 15 .

[0021] The power transmission coil 11 is a primary coil installed on the ground 4. The power transmission unit 12 is a device having the power transmission coil 11, and is installed on the ground 4 in the parking space together with the power transmission coil 11. The wall box 13 is installed near the parking space, such as the wall of the parking lot. The power transmission ECU 14 and the communication device 15 are installed in the wall box 13. The power transmission unit 12 is electrically connected to the wall box 13. Electric power from the AC power supply is supplied to the power transmission unit 12. In the power supply device 10, the power of the AC power supply is supplied to the power transmission unit 12 via the power conversion unit.

[0022] The power transmission ECU 14 is an electronic control device that controls the power supply device 10. The power transmission ECU 14 includes a processor and a memory. The processor is composed of a CPU and the like. The memory is composed of a RAM, a ROM and the like. Signals from various sensors are input to the power transmission ECU 14. The power transmission ECU 14 performs various controls based on the signals input from the various sensors. For example, the power transmission ECU 14 controls the switching element included in the power conversion unit of the power supply device 10 to adjust the power for power transmission. In addition, the power transmission ECU 14 can use the information obtained by the communication device 15 to perform power transmission control. The power transmission control is a wireless power transmission control to the vehicle 3.

[0023] The communication device 15 performs wireless communication with the vehicle 3 parked in the parking space. The communication device 15 transmits information from the power transmission ECU 14 to the vehicle 3 and receives information transmitted from the vehicle 3. The communication device 15 can perform wireless communication based on, for example, Wi-Fi (registered trademark) or wireless LAN.

[0024] The vehicle 3 is an electric vehicle that can be charged with electric power transmitted in a contactless manner from the ground-side device 2. For example, the vehicle 3 is composed of a battery electric vehicle (BEV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHEV), etc. The vehicle 3 is a vehicle that can be parked in a parking space provided with a power transmission coil 11.

[0025] The vehicle 3 includes a power receiving device 20 , a power receiving coil 21 , a battery 22 , a vehicle ECU 23 , and a communication device 24 .

[0026] The power receiving device 20 has a power receiving coil 21 provided at the lower part of the vehicle 3. The power receiving coil 21 receives the power transmitted from the power transmitting coil 11 in a non-contact manner. The power receiving device 20 supplies the power received from the power supply device 10 to the battery 22. The power supply device 10 and the battery 22 are electrically connected.

[0027] The battery 22 is an on-vehicle battery that can be charged externally. The battery 22 stores the electric power received by the power receiving device 20. The battery 22 is composed of a secondary battery that stores the electric power supplied from the power receiving device 20.

[0028] The vehicle ECU 23 is an electronic control device for controlling the vehicle 3. The vehicle ECU 23 has the same hardware structure as the power transmission ECU 14. The vehicle ECU 23 performs various vehicle controls based on signals input from various sensors mounted on the vehicle 3 and information obtained through communication using the communication device 24. The vehicle control includes charging control for storing the power transmitted from the power transmission unit 12 in a non-contact manner in the battery 22. The charging control is a control for transmitting power from the power transmission coil 11 to the power receiving coil 21 in a non-contact manner and storing the power received by the power receiving coil 21 in the battery 22.

[0029] The communication device 24 performs wireless communication with the vehicle external device such as the ground side device 2. The communication device 24 performs wireless communication with the communication device 15 of the power supply device 10 when the vehicle 3 performs contactless charging. The communication device 24 transmits information from the vehicle 3 to the power supply device 10 and receives information transmitted from the power supply device 10 to the vehicle 3.

[0030] When wireless communication based on Wi-Fi (registered trademark) is performed between the ground-side device 2 and the vehicle 3, as shown in FIG. Figure 2 As shown, the communication device 15 and the communication device 24 perform wireless communication using channels of each predetermined frequency band. In this case, there is a channel of a frequency band that does not interfere with each other, such as 1ch, 6ch, and 11ch. Therefore, when performing contactless charging, wireless communication can be established between the ground-side device 2 and the vehicle 3 using any one of the channels of 1ch, 6ch, and 11ch.

[0031] In the non-contact charging system 1, non-contact charging from the power supply device 10 to the vehicle 3 is performed in a state where wireless communication between the vehicle 3 and the power supply device 10 is established. In a state where the vehicle 3 and the power supply device 10 are paired by wireless communication, power is transmitted from the ground-side power transmission coil 11 to the vehicle-side power receiving coil 21 in a non-contact manner. In the vehicle 3, control is performed to supply the power received by the power receiving coil 21 to the battery 22.

[0032] In the non-contact charging system 1 configured as above, wireless communication between the vehicle 3 and the ground may be interrupted during non-contact charging from the ground-side device 2 to the vehicle 3. While charging can be continued when communication is interrupted during charging, there is a risk of overcharging the battery 22. Therefore, in the non-contact charging system 1, communication is reconnected in advance when communication is interrupted during charging, so that charging can be continued more safely.

[0033] Figure 3 is a flowchart showing charging control. Figure 3 The control shown is executed by the power transmission ECU 14 .

[0034] The power transmission ECU 14 determines whether contactless charging from the ground-side device 2 to the vehicle 3 is being performed (step S1 ). In step S1 , it is determined whether power transmission control by the power transmission ECU 14 is being executed.

[0035] When it is determined that non-contact charging is being performed from the ground-side device 2 to the vehicle 3 (step S1: Yes), the power transmission ECU 14 performs a communication check (step S2). The communication device 15 of the ground-side device 2 has a system for measuring the strength and congestion of the wireless connection. The congestion is used to grasp the number of uses of each channel of wireless communication in the surrounding environment. Figure 2 The communication device 15 can grasp which device uses which channel in the wireless communication environment by setting the channels as shown. In step S2, the number of devices (number of devices in use) using frequency bands of every 5 channels that do not interfere with each other, such as 1ch, 6ch, and 11ch, is confirmed around the ground-side device 2. In addition, the radio wave strength of frequency bands of every 5 channels that do not interfere with each other, such as 1ch, 6ch, and 11ch, is confirmed around the ground-side device 2. Then, the relationship between the number of devices in use and the radio wave strength is confirmed for each channel (each predetermined frequency band). The relationship is expressed by the ratio of the number of devices in use to the radio wave strength. In step S2, the power transmission ECU 14 confirms the number of devices in use and the radio wave strength in each 1ch, 6ch, and 11ch, and calculates the value obtained by dividing the number of devices in use by the radio wave strength. The calculated value is equal to the ratio of the number of devices in use to the radio wave strength. The smaller the value (ratio), the better the communication. The channel with the smallest ratio of the number of devices in use to the radio wave strength becomes the channel with the best communication. Then, the power transmission ECU 14 ranks the channels with good communication. The power transmission ECU 14 ranks the channels so that the smaller the calculated ratio is, the higher the ranking is.

[0036] The power transmission ECU 14 determines whether the communication state between the ground-side device 2 and the vehicle 3 is normal (step S3 ). In step S3 , it is determined whether the wireless communication between the ground-side device 2 and the vehicle 3 is not interrupted.

[0037] When it is determined that the communication state between the ground device 2 and the vehicle 3 is normal (step S3 : Yes), the power transmission ECU 14 continues the non-contact charging from the ground device 2 to the vehicle 3 (step S4 ). After the processing of step S4 is performed, this control routine ends.

[0038] When it is determined that the communication state between the ground-side device 2 and the vehicle 3 is not normal (step S3: No), the power transmission ECU 14 determines whether the power transmission from the ground-side device 2 to the vehicle 3 can be continued (step S5). In step S5, it is determined whether the battery 22 is overcharged. Using information acquired before the wireless communication between the ground-side device 2 and the vehicle 3 is interrupted, for example, using the SOC of the battery 22, when the SOC is lower than the upper limit value of the SOC and there is a margin, it can be determined that the power transmission can be continued.

[0039] When it is determined that the power transmission from the ground-side device 2 to the vehicle 3 can be continued (step S5: Yes), the power transmission ECU 14 implements reconnection of the communication between the ground-side device 2 and the vehicle 3 (step S6). In step S6, the ground-side device 2 and the vehicle 3 whose communication has been interrupted are attempted to be reconnected in the order of the channels sorted in step S2. When the power transmission ECU 14 returns from the communication interruption during charging, the power transmission ECU 14 attempts to reconnect the ground-side device 2 and the vehicle 3 whose communication has been interrupted in sequence from the highest channel after sorting. For example, when 1ch is used in the wireless communication between the ground-side device 2 and the vehicle 3, the other frequency bands different from it become 6ch and 11ch that do not interfere. The power transmission ECU 14 attempts to reconnect under 6ch when 6ch is higher than 11ch according to the sorting in step S2, and attempts to reconnect under 11ch when 11ch is higher than 6ch according to the sorting in step S2. Reconnection in a better communication state is attempted. In addition, the processing of step S2 is performed before a communication abnormality occurs between the ground-side device 2 and the vehicle 3. Therefore, compared with the case where the relationship between the number of devices in use and the radio wave strength is confirmed for each channel after a communication abnormality occurs and the channels are sorted based on the relationship, by performing the calculation before the abnormality occurs as in step S2, the time until the reconnection in step S6 is completed can be shortened.

[0040] When it is determined that the power transmission from the ground-side device 2 to the vehicle 3 cannot be continued (step S5: No), the power transmission ECU 14 stops charging based on wireless power transmission from the ground-side device 2 to the vehicle 3 (step S7). In step S7, the power transmission from the power transmission coil 11 is stopped. After the processing of step S7 is performed, the control routine ends.

[0041] When it is determined that the non-contact charging from the ground-side device 2 to the vehicle 3 is not being performed (step S1 : NO), the control routine proceeds to step S7 .

[0042] As described above, according to the embodiment, since the communication check is completed before the communication abnormality occurs, the time from the communication interruption to the completion of the reconnection can be shortened. Thus, the communication interruption period during which there is a risk of overcharging can be shortened. As a result, the risk of overcharging can be reduced.

[0043] In addition, the power supply device 10 does not necessarily need to include the wall box 13. The power supply device 10 may be a device in which the power transmission ECU 14 and the communication device 15 are installed on the ground 4 together with the power transmission unit 12.

[0044] In addition, the ground-side device 2 may be installed in a parking lot having a plurality of parking spaces. In this case, the power supply device 10 is installed in each parking space.

[0045] In addition, regarding Wi-Fi (registered trademark) channels, any combination of five channels that does not cause interference is acceptable, and is not limited to a combination of 1ch, 6ch, and 11ch. For example, a combination of 2ch, 7ch, and 12ch, or a combination of 3ch, 8ch, and 13ch is also possible.

[0046] in addition, Figure 3 The control shown is not limited to the power transmission ECU 14, but can also be performed by the vehicle ECU 23. For example, the vehicle ECU 23 can perform Figure 3 The process of steps S1 to S7 shown in the figure. In this case, the communication device 24 of the vehicle 3 has a system for measuring the strength and congestion of the wireless connection. Furthermore, in step S5, the vehicle ECU 23 determines whether it is possible to continue receiving power from the ground-side device 2.

[0047] Description of Reference Numerals

[0048] 1Contactless charging system

[0049] 2Ground side device

[0050] 3. Vehicles

[0051] 4 Ground

[0052] 10 Power supply device

[0053] 11 Power transmission coil

[0054] 12 Power Transmission Department

[0055] 13 Wall Box

[0056] 14 Power transmission ECU

[0057] 15 communication devices

[0058] 20 Power receiving device

[0059] 21 Power receiving coil

[0060] 22Battery

[0061] 23 Vehicle ECU

[0062] 24 communication devices

Claims

1. A vehicle comprising: A power receiving coil receives power transmitted from a power transmitting coil on the ground side in a contactless manner; a storage battery for storing the power received by the power receiving coil; a control device for executing charging control for supplying the storage battery with the electric power transmitted from the power transmission coil to the power reception coil in a non-contact manner; and The communication device performs wireless communication with a ground-side device including the power transmission coil, wherein the vehicle is characterized in that: The control device confirms the relationship between the number of devices using other frequency bands different from the frequency band used in wireless communication with the ground-side device and the radio wave strength of the other frequency bands before a communication abnormality occurs between the ground-side device and the communication device, and sorts the channels of the other frequency bands according to the confirmation result. When communication with the ground-side device is interrupted during charging with electric power supplied from the power transmission coil, the control device attempts to reconnect with the ground-side device with interrupted communication in the order of the sorted channels.

2. The vehicle according to claim 1, characterized in that The relationship between the number of devices and the radio wave strength is represented by a ratio of the number of devices to the radio wave strength. The control device calculates the ratio of the number of devices to the radio wave strength for each of the other frequency bands, and sorts the channels corresponding to the other frequency bands in such a way that the smaller the calculated ratio, the higher the ranking. When recovering from the interruption of the communication, attempts are made to reconnect with the ground-side device whose communication was interrupted, starting from the higher-order channels after the sorting.

3. The vehicle according to claim 2, characterized in that The control device confirms the relationship between the number of devices and the radio wave strength and sorts the channels before receiving power from the power transmission coil after establishing communication with the ground-side device.

4. A power supply device comprising: A power transmission coil is arranged on the ground; a control device for controlling power transmission from the power transmission coil to a power receiving coil mounted on the vehicle in a contactless manner; and The communication device performs wireless communication with the vehicle, and the power supply device is characterized in that: The control device confirms the relationship between the number of devices using other frequency bands different from the frequency band used in wireless communication with the vehicle and the radio wave strength of the other frequency bands before a communication abnormality occurs between the vehicle and the communication device, and sorts the channels of the other frequency bands based on the confirmation result. When communication with the vehicle is interrupted during power transmission from the power transmission coil to the power reception coil, an attempt is made to reconnect with the vehicle whose communication is interrupted in the order of the sorted channels.

5. The power supply device according to claim 4, characterized in that: The relationship between the number of devices and the radio wave strength is represented by a ratio of the number of devices to the radio wave strength. The control device calculates the ratio of the number of devices to the radio wave strength for each of the other frequency bands, and sorts the channels corresponding to the other frequency bands in such a way that the smaller the calculated ratio, the higher the ranking. When recovering from the interruption of the communication, attempts are made to reconnect with the vehicle whose communication was interrupted, starting from the ranked upper channel.

6. The power supply device according to claim 5, wherein: The control device confirms the relationship between the number of devices and the radio wave strength and sorts the channels before transmitting electric power from the power transmission coil after establishing communication with the vehicle.

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