JP2015138981A - Power transmission device, power reception device, and power transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device, a power reception device and a power transmission system, capable of appropriately transmitting data in a configuration having a preset upper limit value of the total sum of data transmission periods of time per reference time.SOLUTION: A power transmission system 10 includes: a power transmission device 11 including a primary side coil 13 and a power transmission side communication unit 15 as a power transmission part; and a power reception device 21 including a secondary side coil 23 and a power reception side communication unit 27 as a power reception part. Here, the upper limit value of the total sum of the data transmission periods of time transmitted from respective communication units 15, 27 is preset. The respective communication units 15, 27 restrict data transmission on the basis of the priority and the cumulative transmission periods of time of data.

Description

  The present invention relates to a power transmission device, a power reception device, and a power transmission system.

  DESCRIPTION OF RELATED ART Conventionally, the power transmission system provided with the power transmission apparatus which has a power transmission part, and the power receiving apparatus which has a power receiving part is known. For example, a power transmission system described in Patent Literature 1 includes a power transmission device having a power transmission connector as a power transmission unit and a power transmission cable provided with the power transmission connector, and a power reception device having a power reception connector connectable to the power transmission connector as a power reception unit. And. In this power transmission system, power transmission is performed from the power transmission device to the power reception device by connecting the power transmission connector and the power reception connector.

  For example, the power transmission system described in Patent Document 2 includes a power transmission device having a primary coil as a power transmission unit and a power reception device having a secondary coil as a power reception unit. In this power transmission system, power transmission is performed from the power transmission device to the power reception device due to magnetic field resonance between the primary side coil and the secondary side coil. Each of the power transmission device and the power reception device is provided with a communication device that performs wireless communication, and exchanges data between the two.

JP 2012-105474 A JP 2009-106136 A

  Here, depending on the wireless communication method, an upper limit value of the sum total of data transmission times per reference time may be determined in advance. For example, in 920 MHz Zigbee (registered trademark) communication, the total data transmission time per hour is limited to 360 seconds or less depending on conditions such as carrier sense time.

In such a configuration in which the total data transmission time per reference time is limited, a situation in which necessary data cannot be transmitted may occur.
An object of the present invention has been made in view of the above-described circumstances, and is a power transmission device capable of suitably transmitting data in a configuration in which an upper limit value of the sum of data transmission times per reference time is determined in advance. It is to provide a power receiving device and a power transmission system.

  A power transmission device that achieves the above object includes a power transmission unit to which power is input and a power transmission side communication unit that performs wireless communication, and a power reception unit that can receive the power input to the power transmission unit, and Transmitting power to a power receiving apparatus having a power receiving side communication unit that performs wireless communication with the power transmission side communication unit, and an upper limit of the total transmission time of data transmitted from the power transmission side communication unit per predetermined reference time The value is determined in advance, and each data transmitted from the power transmission side communication unit is set with a priority, and is used to transmit data already transmitted from the power transmission side communication unit within the reference time. A limiting unit is provided that limits data transmitted from the power transmission side communication unit based on the accumulated transmission time required and the priority.

  According to such a configuration, by limiting the data transmitted from the power transmission side communication unit based on the accumulated transmission time and the priority, for example, when the accumulated transmission time is approaching the upper limit value, relatively priority is given. It is possible not to transmit data with a low degree. As a result, it is possible to make it difficult to cause a situation in which data having a relatively high priority cannot be transmitted when the accumulated transmission time reaches the upper limit value within the reference time.

  Regarding the power transmission device, each data transmitted from the power transmission side communication unit includes high priority data and low priority data in which the priority is relatively high and low, and the limit unit includes the reference time If the cumulative transmission time becomes longer than a predetermined low threshold cumulative transmission time, the low priority data may be restricted from being transmitted until the reference time elapses. According to such a configuration, an increase in the accumulated transmission time can be suppressed by the amount that the low priority data is not transmitted. Therefore, it is possible to suppress the occurrence of a situation in which the accumulated transmission time reaches the upper limit value within the reference time.

  With respect to the power transmission device, the restriction unit may perform the high threshold cumulative transmission in which the cumulative transmission time is longer than the low threshold cumulative transmission time even when the cumulative transmission time is longer than the low threshold cumulative transmission time. If it is less than the time, transmission of the high priority data may not be restricted. According to this configuration, the high priority data is transmitted unless the accumulated transmission time reaches the high threshold accumulated transmission time. As a result, a situation in which high priority data is not transmitted is unlikely to occur. Therefore, inconvenience caused by the fact that high priority data is not transmitted can be suppressed. The high threshold cumulative transmission time includes an upper limit value of the sum total of transmission times of data transmitted from the power transmission side communication unit per reference time.

  Regarding the power transmission device, the high priority data may be data transmitted from the power transmission side communication unit to the power reception side communication unit in a situation where power transmission from the power transmission unit to the power reception unit is performed. . According to such a configuration, since data transmitted in a situation where power transmission from the power transmission unit to the power reception unit is performed is not easily restricted, there is a problem in power transmission from the power transmission unit to the power reception unit. It can be suppressed. Thereby, electric power transmission can be performed suitably. As a more specific configuration of the high priority data, for example, a stop signal for requesting to stop power transmission, power value data input to the power transmission unit, and the like can be considered.

  With respect to the power transmission device, the limiting unit transmits data from a cumulative data amount storage unit that stores a cumulative data amount that is a sum of data amounts already transmitted within the reference time, and data transmitted from the power transmission side communication unit. Each time, the update unit that updates the cumulative data amount stored in the cumulative data amount storage unit, and the cumulative transmission time using the cumulative data amount stored in the cumulative data amount storage unit. And a calculating unit for calculating. According to this configuration, it is possible to grasp the accumulated transmission time without directly measuring the transmission time that is difficult to measure compared to the data amount. Therefore, the accumulated transmission time can be grasped relatively easily.

  Regarding the power transmission device, when data is transmitted from the power transmission side communication unit to the power reception side communication unit, the power transmission side communication unit is a signal transmitted from the power reception side communication unit and has received the data When the determination unit determines that the reception response signal is not received by the determination unit, the data transmission side communication unit determines whether or not the reception response signal is received. The limiting unit limits the data not to be retransmitted based on the accumulated transmission time and the priority, or limits the number of times the data is retransmitted. There should be. According to such a configuration, based on the cumulative transmission time and priority, by not retransmitting data or limiting the number of data retransmissions, the cumulative transmission time can be increased compared to a configuration in which retransmission is performed indefinitely. Can be suppressed. Thereby, it is possible to avoid a situation in which the accumulated transmission time reaches the upper limit value.

  A power receiving device that achieves the above object is a power receiving unit that receives power from a power transmitting unit to which power is input and a power transmitting side communication unit that performs wireless communication, and is input to the power transmitting unit. A power receiving unit capable of receiving power, and a power receiving side communication unit that performs wireless communication with the power transmission side communication unit, and a transmission time of data transmitted from the power receiving side communication unit per predetermined reference time The upper limit value of the sum is determined in advance, each data transmitted from the power receiving communication unit is set with a priority, and the data already transmitted from the power receiving communication unit within the reference time And a limiting unit that limits data transmitted from the power-receiving-side communication unit based on the accumulated transmission time required for transmission and the priority.

  According to such a configuration, by limiting the data transmitted from the power receiving side communication unit based on the accumulated transmission time and the priority, for example, when the accumulated transmission time is approaching the upper limit value, relatively priority is given. It is possible not to transmit data with a low degree. As a result, it is possible to make it difficult to cause a situation in which data having a relatively high priority cannot be transmitted when the accumulated transmission time reaches the upper limit value within the reference time. In addition, about a power receiving apparatus, there exists the same effect by providing the various structure which concerns on the power transmission apparatus mentioned above.

  A power transmission system that achieves the above object includes the power transmission device and the power reception device. According to such a configuration, it is possible to suitably exchange data between the communication units in a configuration in which the upper limit value of the sum of the data transmission times per reference time is determined in advance.

  According to the present invention, data can be suitably transmitted in a configuration in which the upper limit value of the total data transmission time per reference time is determined in advance.

The schematic diagram which shows the outline | summary of an electric power transmission system. The block diagram which shows the electric constitution of an electric power transmission system. The flowchart which shows the power transmission request | requirement response process performed in the power transmission side communication part. The conceptual diagram for demonstrating map data. The flowchart which shows the reset process performed in the power transmission side communication part.

Hereinafter, embodiments of the power transmission device, the power reception device, and the power transmission system will be described.
As shown in FIG. 1, the power transmission system 10 includes a power transmission device 11 (charging station) and a power reception device 21 (vehicle side device) capable of transmitting power. The power receiving device 21 is mounted on the vehicle C.

  As illustrated in FIG. 2, the power transmission device 11 includes an AC power supply 12 that can output AC power having a predetermined frequency. The AC power supply 12 converts system power input from the system power supply E as infrastructure to AC power, and outputs the converted AC power. The AC power supply 12 is configured to be able to output AC power having a plurality of types of power values.

  The power transmission system 10 of this embodiment is a non-contact type, and AC power output from the AC power source 12 is transmitted to the power receiving device 21 in a non-contact manner, and charging of the vehicle battery 22 provided in the power receiving device 21 is performed. Used for. Specifically, the power transmission device 11 includes a primary side coil (power transmission unit) 13 to which AC power output from the AC power source 12 is input. The power receiving device 21 includes a secondary coil (power receiving unit) 23 that can receive AC power from the primary coil 13 in a non-contact manner.

  The primary side coil 13 and the secondary side coil 23 are configured to be capable of magnetic field resonance. For example, a primary side capacitor (not shown) is connected to the primary side coil 13 in series or in parallel to form a resonance circuit. Similarly, a secondary side capacitor (not shown) is connected to the secondary side coil 23 in series or in parallel to form a resonance circuit. The resonance frequency of the resonance circuit including the primary coil 13 and the resonance circuit including the secondary coil 23 are set to be the same.

  According to such a configuration, when AC power is input to the primary side coil 13 in a situation where the secondary side coil 23 is disposed at a position where the primary side coil 13 and the primary side coil 13 can magnetically resonate, the primary side coil 13 The resonance circuit including 13 and the resonance circuit including the secondary coil 23 perform magnetic field resonance. Thereby, the secondary side coil 23 receives AC power from the primary side coil 13 in a non-contact manner. Note that the frequency of the AC power output from the AC power supply 12 may be set to be the same as or close to the resonance frequency of each of the resonance circuits.

  Here, as shown in FIG. 1, a plurality of power transmission devices 11 are installed corresponding to a plurality of parking spaces S in which the vehicle C can be parked. In this case, the primary side coil 13 of each power transmission apparatus 11 is arrange | positioned 1 each in each parking space S, respectively.

  As shown in FIG. 1, the secondary side coil 23 is disposed at a position where it can face each of the primary side coils 13, specifically, at the bottom of the vehicle C. When the vehicle C is parked in one of the parking spaces S, the secondary coil 23 is opposed to the primary coil 13 installed in the parked parking space S, and the primary coil It arrange | positions in the position which can carry out magnetic field resonance with the side coil 13. FIG.

  As shown in FIG. 2, the power receiving device 21 includes a charger 24 that converts AC power received by the secondary coil 23 (hereinafter simply referred to as “received power”) into DC power. When the DC power output from the charger 24 is input to the vehicle battery 22, the vehicle battery 22 is charged.

  In addition, the power receiving device 21 includes a measuring unit 25 that measures received power. The measurement unit 25 transmits the measurement result to the power receiving side controller 26 as the power receiving side control unit provided in the power receiving device 21. Thereby, the power receiving side controller 26 can grasp | ascertain received power. That is, the power receiving side controller 26 grasps the pattern of the received power such as the power value of the received power and the timing (time) at which the received power is measured based on the measurement result of the measuring unit 25.

  The power receiving device 21 also includes an SOC sensor (not shown) that detects the state of charge (SOC) of the vehicle battery 22 and transmits the detection result to the power receiving side controller 26. Thereby, the power receiving side controller 26 can grasp | ascertain the charge condition of the battery 22 for vehicles.

  The power transmission device 11 includes a power transmission side controller 14 as a power transmission side control unit that controls the AC power supply 12 and the like, and a power transmission side communication unit 15 that performs wireless communication. When receiving various data, the power transmission side communication unit 15 transmits the received data to the power transmission side controller 14. Thereby, the power transmission side controller 14 can grasp the received data received by the power transmission side communication unit 15. Moreover, the power transmission side controller 14 requests | requires a transmission so that various data may be transmitted with respect to the power transmission side communication part 15 as needed.

  As illustrated in FIG. 2, the power reception device 21 includes a power reception side communication unit 27 that performs wireless communication with the power transmission side communication unit 15. When receiving various data, the power receiving side communication unit 27 transmits the received data to the power receiving side controller 26. Thereby, the power receiving side controller 26 can grasp the received data received by the power receiving side communication unit 27. Moreover, the power receiving side controller 26 makes a transmission request to transmit various data to the power receiving side communication unit 27 as necessary.

  The power transmission side communication unit 15 and the power reception side communication unit 27 are configured to be able to exchange data (communication) with each other wirelessly. For example, the communication units 15 and 27 exchange data with Zigbee (registered trademark) communication in the 920 MHz band.

  Incidentally, each of the communication units 15 and 27 is configured to transmit an ACK signal (reception response signal) indicating that the data has been normally received to the transmission source when the data is normally received.

The power transmission system 10 executes a series of processes related to power transmission from the power transmission apparatus 11 to the power reception apparatus 21 while exchanging data between the communication units 15 and 27.
First, the power receiving side controller 26 of the power receiving device 21 specifies the power transmitting device 11 having the primary side coil 13 capable of magnetic field resonance with the secondary side coil 23 of the power receiving device 21 among the plurality of power transmitting devices 11.

  For example, when the vehicle C is placed in the parking space S, the power receiving side controller 26 makes a transmission request to the power receiving side communication unit 27 so that the search signal is transmitted by broadcast. The power receiving side communication unit 27 broadcasts a search signal in response to the transmission request on condition that transmission is not restricted. When receiving the search signal, the power transmission side communication unit 15 transmits an ACK signal to the power reception side communication unit 27 and transmits ID data (identification data) and the like of the power transmission device 11 on the condition that transmission is not restricted. .

  The power receiving side controller 26 grasps the power transmitting device 11 existing in an area where wireless communication with the power receiving side communication unit 27 is possible from the ID data of the power transmitting device 11 received by the power receiving side communication unit 27.

  And the power receiving side controller 26 transmits to the power receiving side communication part 27 so that the power transmission side communication part 15 of the grasped power transmission apparatus 11 may transmit the 1st power transmission request signal which requests | requires transmission of the electric power for identification as AC power. Make a request. The power reception side communication unit 27 transmits the first power transmission request signal to the power transmission side communication unit 15 in response to the transmission request on condition that the transmission is not restricted.

  When receiving the first power transmission request signal, the power transmission side communication unit 15 transmits an ACK signal to the power reception side communication unit 27 on the condition that transmission is not restricted. Further, the power transmission side controller 14 controls the AC power supply 12 so that the identification power is input to the primary side coil 13 based on the reception of the first power transmission request signal by the power transmission side communication unit 15.

  Further, the power receiving side controller 26 determines whether or not the AC power corresponding to the identification power is measured by the measurement unit 25, and when the AC power corresponding to the identification power is measured by the measurement unit 25, The power receiving device 21 and the power transmission device 11 that is the transmission destination of the first power transmission request signal are identified as a combination in which power transmission is performed.

  Incidentally, when a plurality of power transmission devices 11 are grasped, the power receiving side controller 26 sequentially transmits the first power transmission request signal to the power transmission side communication unit 15 of each power transmission device 11, for example. And the power receiving side controller 26 collates the timing when alternating current power was measured by the measurement part 25, and the timing when the 1st power transmission request signal was transmitted with respect to the power transmission side communication part 15 of each power transmission apparatus 11. The power transmission device 11 having the primary side coil 13 that magnetically resonates with the secondary side coil 23 of the power receiving device 21 is specified.

  The timing at which the first power transmission request signal is transmitted to the power transmission side communication unit 15 of each power transmission device 11 can also be said to be the timing at which identification power is input to the primary side coil 13 of each power transmission device 11. . Further, the primary coil 13 that magnetically resonates with the secondary coil 23 can be said to be the primary coil 13 that satisfies the power transmission condition (power transmission condition) with the secondary coil 23.

  When a power transmission device 11 (hereinafter also simply referred to as a target power transmission device) related to a combination in which power transmission is performed is specified, the power transmission system 10 identifies the power transmission side communication unit 15 of the target power transmission device and the power reception side of the power reception device 21. Communication with the communication unit 27 is established.

  Specifically, the power receiving side controller 26 makes a transmission request to the power receiving side communication unit 27 to transmit the connection request signal. The power reception side communication unit 27 transmits a connection request signal to the power transmission side communication unit 15 of the target power transmission apparatus on the condition that transmission is not restricted. When the power transmission side communication unit 15 of the target power transmission device receives the connection request signal, the power transmission side communication unit 15 executes processing for establishing communication with the power reception side communication unit 27. Specifically, the power transmission side communication unit 15 authenticates (recognizes) the power reception side communication unit 27 as a communication partner, and transmits a connection response signal to the power reception side communication unit 27. When receiving the connection response signal, the power reception side communication unit 27 authenticates (recognizes) the power transmission side communication unit 15 of the target power transmission apparatus as a communication partner. Thereby, each communication part 15 and 27 recognizes that it is the other party who exchanges data mutually.

  The power transmission system 10 receives power from the target power transmission device 21 until the predetermined termination condition is satisfied based on the establishment of communication between the power transmission side communication unit 15 and the power reception side communication unit 27 of the target power transmission device. Power transmission to

  Specifically, the power receiving side controller 26 makes a transmission request to the power receiving side communication unit 27 to transmit a second power transmission request signal for requesting transmission of charging power as AC power. The power reception side communication unit 27 transmits the second power transmission request signal to the power transmission side communication unit 15 on the condition that transmission is not restricted. When the power transmission side communication unit 15 of the target power transmission apparatus receives the second power transmission request signal, the power transmission side communication unit 15 transmits an ACK signal on the condition that the transmission is not restricted. In addition, when the second power transmission request signal is received by the power transmission side communication unit 15, the power transmission side controller 14 controls the AC power supply 12 so that the charging power is input to the primary side coil 13. As a result, charging power is transmitted toward the secondary coil 23 via the primary coil 13, converted into DC power by the charger 24, and input to the vehicle battery 22. The input of charging power to the primary coil 13 (output of charging power from the AC power supply 12) is continued until the end condition is satisfied. Incidentally, the power value of the charging power is larger than the power value of the identification power. Although the termination condition is arbitrary, for example, a case in which the state of charge detected by the SOC sensor becomes a fully charged state (charge end trigger state) can be considered.

In such a configuration, the power transmission side communication unit 15 and the power reception side communication unit 27 regularly exchange data in a situation where charging power is output from the AC power supply 12.
In detail, the power transmission side controller 14 is the data regarding the electric power value (henceforth transmission power value) of the alternating current power input into the primary side coil 13 regularly in the condition where the electric power for charging is output from the alternating current power supply 12 A transmission request is made to the power transmission side communication unit 15 to transmit the transmitted power value data. The power transmission side communication unit 15 transmits the transmission power value data on condition that the transmission is not restricted. In addition, about the transmission power value, it is good to grasp | ascertain based on the measurement result of the said measurement part, for example, providing the measurement part which measures the electric power value of the input end of the primary side coil 13. FIG.

  When receiving power transmission power value data, the power receiving side communication unit 27 transmits an ACK signal on the condition that transmission is not restricted. Further, the power receiving side controller 26 confirms that the charging power is being transmitted based on the reception power value data received by the power receiving side communication unit 27.

  Further, the power receiving side controller 26 is the power value of the AC power received by the secondary coil 23 using the measurement result of the measuring unit 25 when the transmission power value data is received by the power receiving side communication unit 27. Know the received power value. And the power receiving side controller 26 calculates transmission efficiency from a transmitted power value and a received power value, and confirms that the transmission efficiency is not too low.

  In addition, the power receiving side controller 26 makes a transmission request to the power receiving side communication unit 27 to transmit the received power value data that is data related to the received power value. The power reception side communication unit 27 transmits the received power value data to the power transmission side communication unit 15 on the condition that transmission is not restricted.

  When receiving the received power value data, the power transmission side communication unit 15 transmits an ACK signal on the condition that transmission is not restricted. The power transmission side controller 14 determines whether the received power value of the received power value data matches the target value or falls within the allowable range. If the received power value deviates from the target value, the received power value The transmission power value (specifically, the AC power supply 12) is controlled so as to approach the target value.

  Further, the power receiving side controller 26 periodically determines whether or not the end condition is satisfied. If the end condition is satisfied, the power receiving side controller 26 requests the power receiving side communication unit 27 to transmit a normal stop signal. I do. The power reception side communication unit 27 transmits a normal stop signal to the power transmission side communication unit 15 on the condition that transmission is not restricted. When receiving the normal stop signal, the power transmission side communication unit 15 transmits an ACK signal on condition that transmission is not restricted. The power transmission side controller 14 stops the output of the charging power when the normal power stop signal is received by the power transmission side communication unit 15. Thereby, the power transmission from the target power transmitting apparatus to the power receiving apparatus 21 ends.

  Incidentally, the power receiving side controller 26 periodically determines whether or not an abnormality has occurred in the power receiving device 21 during power transmission. Then, when an abnormality occurs, the power receiving side controller 26 makes a transmission request to the power receiving side communication unit 27 so as to transmit an abnormality notification signal. The power reception side communication unit 27 transmits an abnormality notification signal to the power transmission side communication unit 15 on the condition that transmission is not restricted. When the power transmission side communication unit 15 receives the abnormality notification signal, the power transmission side communication unit 15 transmits an ACK signal on condition that transmission is not restricted. When the abnormality notification signal is received by the power transmission side communication unit 15, the power transmission side controller 14 stops the output of the charging power and notifies that the abnormality has been stopped using a predetermined notification unit.

  The abnormality in the power receiving device 21 is, for example, that the received power value (or transmission efficiency) is excessively small, the power value of the DC power input to the vehicle battery 22 is excessively small relative to the received power value, It is conceivable that the temperature of the vehicle battery 22 is excessively increased and the vehicle C is moving.

  Similarly, the power transmission side controller 14 performs abnormality determination whether abnormality has generate | occur | produced in the power transmission apparatus 11 regularly during electric power transmission. And when abnormality has generate | occur | produced, the power transmission side controller 14 makes a transmission request | requirement to the power transmission side communication part 15 so that the output of the electric power for charging may be stopped and an abnormality notification signal may be transmitted. The power transmission side communication unit 15 transmits an abnormality notification signal to the power reception side communication unit 27 on the condition that transmission is not restricted. The power receiving side controller 26 determines that the power transmission has stopped abnormally when the power receiving side communication unit 27 receives the abnormality notification signal. Note that the abnormality of the power transmission device 11 may be, for example, excessive heat generation of the AC power supply 12 and the primary coil 13, overcurrent due to a short circuit, disconnection, or the like.

  After charging of the vehicle battery 22 (power transmission related to charging power) is completed, the communication units 15 and 27 are periodically in a state of the vehicle C (power receiving device 21) on condition that transmission is not restricted. And exchanges data such as the state of the power transmission device 11. Thereby, it can be confirmed that the vehicle C has not moved from the parking space S where the primary coil 13 of the target power transmission device is installed. In addition, when AC power is erroneously input to the primary coil 13 of the target power transmission apparatus, the AC power is measured by the measurement unit 25. In this case, the power reception side communication unit 27 transmits a signal indicating that erroneous power transmission is being performed to the power transmission side communication unit 15. Thereby, incorrect power transmission can be detected.

  As described above, the power transmission side communication unit 15 and the power reception side communication unit 27 have a preparation stage until power transmission related to charging power is started, a charging stage where power transmission related to charging power is performed, and preparation. Data is exchanged with each other in both the normal and non-charging stages. Note that the various signals described above are a type of data exchanged between the communication units 15 and 27.

  More specifically, the preparation stage is a stage from the search for the power transmission device 11 (transmission of the search signal) to the output of the charging power (transmission of the second power transmission request signal), and the charging stage is the charging power. This is the stage from the output until the output of the charging power stops. The normal stage is, for example, a stage after the charging stage ends or before the search for the power transmission device 11 is performed (a stage where the vehicle C does not exist in an area where wireless communication is possible).

  Here, in the communication method between the communication units 15 and 27, the total data transmission time per reference time may be limited depending on the carrier sense time or the like. For example, in the present embodiment, the upper limit value of the total sum of data transmission times per hour is set to 360 seconds.

  On the other hand, the power transmission system 10 of the present embodiment is configured to cope with the limitation on the sum of the data transmission times per reference time. Specifically, the communication units 15 and 27 execute a transmission request handling process when a transmission request is received from the controllers 14 and 26 as a trigger (trigger). The transmission request handling process is configured to limit data transmission according to the accumulated transmission time per reference time and the priority of data.

  Hereinafter, the transmission request handling process will be described. Note that the transmission request handling process of the power transmission side communication unit 15 and the transmission request handling process of the power reception side communication unit 27 are basically the same except that the data to be transmitted is different. The transmission request response process of the power transmission side communication unit 15 will be described.

  As shown in FIG. 3, first, in step S101, the power transmission side communication unit 15 grasps the accumulated data amount. Specifically, as illustrated in FIG. 2, the power transmission side communication unit 15 includes a cumulative data amount storage unit 15 a that stores a cumulative data amount that is a sum of data amounts of data already transmitted within the reference time. ing. The accumulated data amount storage unit 15a is composed of a nonvolatile memory. The power transmission side communication unit 15 accesses the accumulated data amount storage unit 15a and grasps the accumulated data amount stored in the accumulated data amount storage unit 15a.

  In subsequent step S102, the power transmission side communication unit 15 calculates an accumulated transmission time which is a time required for transmitting data already transmitted within the reference time from the accumulated data amount. The accumulated transmission time is calculated from the accumulated data amount and the communication rate. The function of the power transmission side communication unit 15 executing the process of step S102 corresponds to the calculation unit.

  Thereafter, in step S103, the power transmission side communication unit 15 calculates a ratio R (R = cumulative transmission time / upper limit value) of the cumulative transmission time to the upper limit value of the sum of the data transmission times per reference time.

  The power transmission side communication part 15 grasps | ascertains the priority of the data (henceforth only object data) requested | required this time transmission in step S104 after the process of step S103. Here, in this embodiment, each data transmitted from the power transmission side communication unit 15 is set with a priority, and the power transmission side communication unit 15 is set with the transmission data and the priority associated with each other. Map data 15b (see FIG. 2).

  As shown in FIG. 4, in the map data 15b, “high” is set as a priority for certain data (D (1) to D (n)), and other data (D (n + 1) to “Medium” is set as the priority for D (n + m)), and “Low” is set as the priority for other data (D (n + m + 1) to D (n + m + k)). The power transmission side communication part 15 grasps | ascertains the priority of object data by referring the map data 15b. In the following description, data with priority set to “high” is referred to as high priority data, data with priority set to “medium” is referred to as medium priority data, and priority is set to “low”. "Is set as low priority data. Note that the number of each priority data is arbitrary, and may be either singular or plural.

  By the way, as an example of a specific setting mode of data priority, high priority data is data exchanged at the charging stage (transmitted power value data, received power value data, normal stop signal, abnormality notification signal, etc. ). The medium priority data is data (search signal, ID data, first power transmission request signal, connection request signal, connection response signal, second power transmission request signal, etc.) exchanged at the preparation stage. The low priority data is data exchanged at a normal stage (for example, data relating to the state of the vehicle C and the power transmission device 11).

  Returning to the description of FIG. 3, after grasping the priority of the target data in step S <b> 104, the power transmission side communication unit 15 proceeds to step S <b> 105 and determines whether the ratio R is equal to or less than a predetermined low threshold ratio Rth <b> 1. judge. The low threshold ratio Rth1 is arbitrary as long as it is a value less than 100%. For example, 50% or the like can be considered.

  Incidentally, if the low threshold ratio Rth1 is multiplied by the upper limit value, the threshold accumulated transmission time (that is, the low threshold accumulated transmission time) corresponding to the low threshold ratio Rth1 is derived. It can also be said that this is a process for determining whether or not the cumulative transmission time is equal to or less than the low threshold cumulative transmission time. Further, if attention is paid to the fact that the low threshold cumulative data amount corresponding to the low threshold ratio Rth1 is derived using the low threshold cumulative transmission time and the communication rate, the processing of step S105 is performed by the cumulative data amount being low threshold cumulative. It can also be said that it is a determination process of whether or not the amount of data is less than or equal to.

  If the ratio R is less than or equal to the low threshold ratio Rth1, it means that there is a sufficient margin in transmission time. In this case, the power transmission side communication unit 15 proceeds to step S106, and transmits the target data regardless of the priority of the target data. And the power transmission side communication part 15 updates accumulation data amount in step S107. Specifically, the power transmission side communication unit 15 adds the data amount of the target data transmitted this time to the current accumulated data amount, and stores the added value in the accumulated data amount storage unit 15a.

  On the other hand, when the ratio R is higher than the low threshold ratio Rth1, it means that the accumulated transmission time is approaching the upper limit value. In this case, the power transmission side communication unit 15 proceeds to step S108, and determines whether the ratio R is less than the middle threshold ratio Rth2 that is higher than the low threshold ratio Rth1. Although the specific value of the middle threshold ratio Rth2 is arbitrary, for example, 80% is conceivable.

  By the way, focusing on the fact that the threshold accumulated transmission time (that is, the medium threshold accumulated transmission time) corresponding to the middle threshold ratio Rth2 is derived by multiplying the middle threshold ratio Rth2 by the upper limit value, the processing in step S108 is It can also be said that this is a process for determining whether or not the accumulated transmission time is less than the medium threshold accumulated transmission time. Further, if attention is paid to the fact that the medium threshold cumulative data amount corresponding to the medium threshold ratio Rth2 is derived using the medium threshold cumulative transmission time and the communication rate, the process of step S108 is performed by the process of step S108. It can also be said that this is a process for determining whether the amount of data is less than the amount of data.

If the ratio R is less than the middle threshold ratio Rth2, the power transmission side communication unit 15 proceeds to step S109, and determines whether the priority of the target data is “medium” or higher.
If the priority of the target data is “medium” or higher (medium priority data or high priority data), the power transmission side communication unit 15 transmits the target data in step S110, and the accumulated data in step S111. Update quantity. On the other hand, if the priority of the target data is not “medium” or higher, that is, if the priority of the target data is “low”, the power transmission side communication unit 15 proceeds to step S117 without transmitting the target data. .

  If the ratio R is equal to or greater than the medium threshold ratio Rth2, the power transmission side communication unit 15 makes a negative determination in step S108 and proceeds to step S112. In step S112, the power transmission side communication unit 15 determines whether the ratio R is less than 100%. When the ratio R is less than 100%, the power transmission side communication unit 15 determines whether or not the priority of the target data is “high” in step S113. When the priority of the target data is “high”, the power transmission side communication unit 15 transmits the target data in step S114, and updates the accumulated data amount in step S115. On the other hand, when the ratio R is 100% (step S112: NO), or the ratio R is less than 100% and the priority of the target data is not “high” (step S112: If YES and Step S113: NO), the process proceeds to Step S117 without transmitting the target data.

  In addition, the function in which the power transmission side communication part 15 performs the process of step S107, step S111, and step S115 corresponds to an update part. In the present embodiment, the high threshold ratio, which is the threshold ratio with which transmission of high priority data is restricted, is 100%. In other words, in this embodiment, the high threshold cumulative transmission time, which is a time that is a threshold for limiting transmission of high priority data and is a value obtained by multiplying the high threshold ratio and the upper limit value, is per reference time. It matches the upper limit of the total data transmission time.

  In step S116 after step S107, step S111, or step S115, the power transmission side communication unit 15 determines whether or not an ACK signal has been received from the power reception side communication unit 27. When the power transmission side communication unit 15 receives the ACK signal, the power transmission side communication unit 15 ends the processing as it is, while the power transmission side communication unit 15 does not receive the ACK signal within a predetermined period after transmitting the target data. Return to step S101. Thereby, the processing after step S101 is executed, and the target data is retransmitted on condition that transmission is not restricted. In addition, the function in which the power transmission side communication part 15 performs the process of step S116 respond | corresponds to a determination part.

  The process of step S117 is executed when transmission of the target data is restricted (prohibited). In step S117, the power transmission side communication unit 15 notifies the power transmission side controller 14 that the target data cannot be transmitted. And the power transmission side communication part 15 complete | finishes this process. When the power transmission side controller 14 receives a notification that the target data cannot be transmitted, the power transmission side controller 14 interrupts the subsequent processing.

  According to this process, when the ratio R is equal to or less than the low threshold ratio Rth1 (R ≦ Rth1), the target data is transmitted regardless of the priority. On the other hand, when the ratio R is higher than the low threshold ratio Rth1 and less than the medium threshold ratio Rth2 (Rth1 <R <Rth2), the low priority data is restricted from being transmitted. Data and high priority data are transmitted without restriction. Further, when the ratio R is equal to or greater than the medium threshold ratio Rth2 and less than 100% (Rth2 ≦ R <100%), the low priority data and the medium priority data are restricted from being transmitted. High priority data is transmitted without restriction. And when the ratio R is 100%, it is restricted so that all data is not transmitted.

  As shown in FIG. 2, the power-receiving-side communication unit 27 also stores a cumulative data amount storage unit 27a that stores a cumulative data amount that is a sum of data amounts already transmitted from the power-receiving-side communication unit 27 within the reference time. It includes map data 27b in which data transmitted by the power receiving side communication unit 27 and priority are set in association with each other. When there is a transmission request from the power receiving side controller 26, the power receiving side communication unit 27 executes the transmission request handling process as described above.

  Note that the upper limit of the total data transmission time per reference time is set for each of the communication units 15 and 27. That is, the power transmission side communication unit 15 performs transmission restriction based on its accumulated transmission time and the like regardless of the transmission status of the power reception side communication unit 27. Similarly, the power receiving side communication unit 27 performs transmission restriction based on its own accumulated transmission time or the like regardless of the transmission status of the power transmission side communication unit 15.

  Incidentally, in this embodiment, the ACK signal is handled as high priority data regardless of the preparation stage, the charging stage, and the normal stage. That is, when the power transmission side communication unit 15 normally receives data from the power reception side communication unit 27, the power transmission side communication unit 15 transmits an ACK signal unless the ratio R becomes 100% (unless the cumulative transmission time reaches the upper limit value). . The same applies to the power receiving side communication unit 27.

  Each of the communication units 15 and 27 executes a reset process for resetting the accumulated transmission time (accumulated data amount). The reset process will be described below. In addition, since the reset process is the same in each communication part 15 and 27, the reset process of the power transmission side communication part 15 is demonstrated in detail, and detailed description of the reset process of the power receiving side communication part 27 is abbreviate | omitted.

As shown in FIG. 5, in step S201, the power transmission side communication unit 15 determines whether or not the reference time has elapsed from the power ON timing or the previous reset timing.
Here, the power ON timing is, for example, a timing at which operating power is supplied to the power transmission side communication unit 15. Although the timing at which the operating power is supplied to the power transmission side communication unit 15 is arbitrary, for example, the timing at which the system power is supplied from the system power supply E to the AC power supply 12 can be considered.

  When the reference time has elapsed from the power ON timing or the previous reset timing, the power transmission side communication unit 15 proceeds to step S202 and resets the accumulated transmission time. Specifically, the power transmission side communication unit 15 sets the accumulated data amount stored in the accumulated data amount storage unit 15a to “0”. Thereby, when the transmission restriction is performed, the transmission restriction is canceled. That is, the reset of the accumulated data amount is a condition for canceling the transmission restriction.

  Here, the power transmission side communication unit 15 determines that the reference time has passed for the target data that is restricted from being transmitted despite the transmission request within the reference time (the accumulated data amount has been reset). To send based on.

  The power ON timing in the reset process executed by the power receiving side communication unit 27 is arbitrary, but may be, for example, the timing when the vehicle C is parked in the parking space S, or the start timing of the vehicle C. May be.

Next, the operation of this embodiment will be described.
In a configuration in which the upper limit value of the total data transmission time per reference time is determined in advance, the higher the ratio R of the cumulative transmission time to the upper limit value, the higher the priority of the data transmission. Then, the data restricted so as not to be transmitted is transmitted based on the accumulated data amount being reset.

According to the embodiment described above in detail, the following effects are obtained.
(1) The power transmission device 11 that transmits power to the power reception device 21 having the secondary coil 23 and the power reception side communication unit 27 as a power reception unit performs wireless communication with the primary side coil 13 (power transmission unit) to which AC power is input. The power transmission side communication part 15 to perform is provided. An upper limit value of the sum of transmission times of data transmitted from the power transmission side communication unit 15 per reference time is determined in advance. In such a configuration, each data transmitted from the power transmission side communication unit 15 is set with a priority, and the power transmission side communication unit 15 of the power transmission device 11 is already transmitted from the power transmission side communication unit 15 within the reference time. The data transmitted from the power transmission side communication unit 15 is limited based on the accumulated transmission time and priority required for transmitting the data.

  According to this configuration, by limiting the data transmitted from the power transmission side communication unit 15 based on the accumulated transmission time and the priority, for example, when the accumulated transmission time is approaching the upper limit value, It is possible not to transmit data with low priority. As a result, it is possible to make it difficult to cause a situation in which data having a relatively high priority cannot be transmitted when the accumulated transmission time reaches the upper limit value within the reference time.

  In particular, in the present embodiment, the power transmission side communication unit 15 is configured to retransmit the data (target data) related to the transmission request indefinitely until an ACK signal is received. In such a configuration, when the communication state is poor due to some cause, the data is not normally received by the other party (the power receiving side communication unit 27) even though the data is transmitted, and the same data is retransmitted many times. Can occur. Then, the cumulative transmission time increases. Further, when the plurality of vehicles C on which the power receiving device 21 is mounted approach the power transmission device 11 within the reference time, the power transmission side communication unit 15 may communicate with the plurality of power reception side communication units 27. Can occur. In this case, the cumulative transmission time increases. Further, when data is exchanged simultaneously with the plurality of power receiving side communication units 27, congestion is likely to occur, and if the communication state deteriorates thereby, the accumulated transmission time may further increase.

  On the other hand, in the present embodiment, data transmission is limited based on the accumulated transmission time and priority. Thereby, it is possible to suitably suppress an increase in accumulated transmission time that is likely to occur in a configuration in which data retransmission is repeatedly performed as described above.

  In addition, “the upper limit value of the sum of transmission times of data transmitted from the power transmission side communication unit 15 per reference time is determined in advance”, in other words, the power transmission device 11 transmits the transmission time per reference time. It can also be said that an upper limit regulation unit that regulates data transmission so as to prevent the sum of the values from exceeding the upper limit.

  (2) The data transmitted from the power transmission side communication unit 15 includes high priority data and low priority data whose priority is relatively high and low. When the accumulated transmission time is longer than the predetermined low threshold accumulated transmission time (accumulated transmission time corresponding to the low threshold ratio Rth1) within the reference time (step S105: NO), Until the reference time elapses (the accumulated data amount is reset), the low priority data is restricted from being transmitted (step S109: NO). As a result, an increase in the accumulated transmission time can be suppressed by the amount that the low priority data is not transmitted. Therefore, it is possible to make it difficult for the cumulative transmission time to reach the upper limit value within the reference time.

  Incidentally, when the cumulative transmission time is equal to or less than the low threshold cumulative transmission time, the low priority data is transmitted without restriction. Thereby, for example, the state of the power transmission device 11 can be transmitted to the power reception device 21.

  (3) Even when the cumulative transmission time is longer than the low threshold cumulative transmission time, the power transmission side communication unit 15 has a case where the cumulative transmission time is less than the high threshold cumulative transmission time (upper limit value). Does not restrict transmission of high priority data. In other words, if the accumulated transmission time is less than the upper limit value, the power transmission side communication unit 15 transmits the high priority data without restriction. As a result, a situation in which high priority data is not transmitted is unlikely to occur. Therefore, it is possible to avoid inconvenience caused by the fact that high priority data is not transmitted, for example, a problem that power transmission is hindered.

  If attention is paid to the medium priority data, the power transmission side communication unit 15 determines that the cumulative transmission time is the medium threshold cumulative transmission time (medium threshold) even when the cumulative transmission time is longer than the low threshold cumulative transmission time. If it is less than the cumulative transmission time corresponding to the ratio Rth2, transmission of medium priority data is not restricted. Thereby, data can be exchanged smoothly in the preparation stage.

  (4) In particular, the high priority data is data transmitted in a situation where the power transmission from the primary side coil 13 to the secondary side coil 23 is performed (charging stage). If transmission of such data is restricted, power transmission may be hindered, and power transmission may not be completed even though power transmission should be terminated.

  On the other hand, in this embodiment, since the data transmitted in the situation where the power transmission from the primary side coil 13 to the secondary side coil 23 is performed is difficult to be restricted, the above-described situation occurs. Occurrence can be suppressed. Therefore, power transmission can be performed suitably.

  (5) The power transmission side communication unit 15 includes a cumulative data amount storage unit 15a in which a cumulative data amount that is the sum of the data amounts already transmitted within the reference time is stored. The accumulated data amount stored in the accumulated data amount storage unit 15a is updated. Then, the power transmission side communication unit 15 calculates the cumulative transmission time using the cumulative data amount stored in the cumulative data amount storage unit 15a. Thereby, it is possible to grasp the accumulated transmission time without directly measuring the transmission time that is difficult to measure compared with the data amount. Therefore, the accumulated transmission time can be grasped relatively easily.

  (6) The power transmission side communication unit 15 is configured such that the accumulated transmission time is reset every time the reference time elapses. In detail, the power transmission side communication part 15 performs the process (step S202) which resets accumulated transmission time (accumulated data amount), whenever reference time passes. In such a configuration, when the transmission of data is restricted, the power transmission side communication unit 15 transmits the transmission restricted data based on the reset of the accumulated transmission time. In other words, the power transmission side communication unit 15 transmits the predetermined data within the next reference time with respect to the predetermined reference time when the predetermined data is not transmitted within the predetermined reference time. To do. Thereby, it is possible to transmit the data requested to be transmitted while avoiding the sum of the data transmission times per reference time from exceeding the upper limit value.

  (7) The power receiving device 21 that receives power from the power transmitting device 11 having the primary side coil 13 and the power transmitting side communication unit 15 as the power transmitting unit is a secondary that can receive the AC power input to the primary side coil 13. A side coil 23 and a power reception side communication unit 27 that performs wireless communication with the power transmission side communication unit 15 are provided. An upper limit value of the sum total of transmission times of data transmitted from the power receiving communication unit 27 per reference time is determined in advance. In such a configuration, each data transmitted from the power receiving communication unit 27 is set with a priority, and the power receiving communication unit 27 of the power receiving device 21 has already been transmitted from the power receiving communication unit 27 within the reference time. The data transmitted from the power receiving communication unit 27 is limited based on the accumulated transmission time and priority required for transmitting the received data. Thereby, there exists an effect similar to (1). Moreover, since the power receiving side communication part 27 is equipped with the structure similar to the power transmission side communication part 15, there exists an effect of (2)-(6).

In addition, you may change the said embodiment as follows.
In the embodiment, the communication units 15 and 27 are configured to retransmit data indefinitely until an ACK signal is received. However, the present invention is not limited to this, and for example, based on the accumulated transmission time and priority, The configuration may be such that retransmission is not performed or the number of data retransmissions is limited. Specifically, for example, when the ratio R is higher than the low threshold ratio Rth1, the communication units 15 and 27 transmit the low priority data only once regardless of whether or not the ACK signal is received. , It may be configured not to retransmit. The communication units 15 and 27 may be configured not to retransmit the medium priority data in addition to the low priority data when the ratio R is the medium threshold ratio Rth2 or more and less than 100%. Furthermore, the communication units 15 and 27 may limit the number of retransmissions of the high priority data to, for example, 5 times when the ratio R is the medium threshold ratio Rth2 or more and less than 100%. According to such a configuration, it is possible to suppress an increase in accumulated transmission time caused by repeated transmission of data in a situation where the communication state is poor.

  As a restriction mode, for example, in a configuration in which the communication units 15 and 27 regularly transmit data, the data transmission cycle may be limited. For example, the power transmission side communication unit 15 transmits the transmission power value data when the ratio R is the medium threshold ratio Rth2 or more and less than 100%, and transmits the transmission power value data when the ratio R is less than the medium threshold ratio Rth2. It may be longer than the period.

  ○ As a restriction mode, for example, data to be transmitted may be simplified. For example, when the ratio R is higher than a predetermined threshold ratio, the power transmission side communication unit 15 is a signal (data) indicating that power transmission is being performed instead of the transmission power value data, and is greater than the transmission power value data. It is good also as a structure which transmits the signal during power transmission with small data amount. Even in this case, the power receiving side controller 26 can grasp at least that power is being transmitted. Similarly, for example, when the ratio R is higher than a predetermined threshold ratio, the power receiving side communication unit 27 simply receives a signal (data) indicating that power is being received instead of the received power value data. A configuration may be employed in which a power reception signal having a data amount smaller than that of power value data is transmitted.

That is, the restriction mode is not limited to a configuration in which data is not transmitted, and the specific mode is arbitrary as long as the increase in data amount (cumulative transmission time) is limited.
The communication units 15 and 27 are configured to transmit the data whose transmission is restricted after the reference time has elapsed when the transmission of data is restricted within the reference time. The data may not be transmitted.

  In the embodiment, the high threshold ratio, which is a threshold ratio at which transmission of high priority data is restricted, is 100%, but is not limited thereto, and is 100 if the threshold ratio is higher than the low threshold ratio Rth1 and the medium threshold ratio Rth2. % May be lower. For example, the high threshold ratio may be set lower by a ratio corresponding to the data amount of specific data (for example, an abnormality notification signal or a normal stop signal) with respect to 100%. In this case, when the ratio R is equal to or higher than the high threshold ratio, the communication units 15 and 27 may be configured to restrict transmission other than the specific data but do not restrict transmission of the specific data. Thereby, it is possible to transmit a specific signal regardless of the accumulated transmission time while suppressing the accumulated transmission time from exceeding the upper limit value.

  ○ The low threshold cumulative transmission time is the remaining transmission time obtained by subtracting the low threshold cumulative transmission time from the upper limit value in the charging stage (a situation where power is transferred from the primary coil 13 to the secondary coil 23). It is good to set so that it may become longer than the sum total of the transmission time of the data transmitted from the power transmission side communication part 15. FIG. Similarly, the medium threshold cumulative transmission time is set so that the remaining transmission time obtained by subtracting the medium threshold cumulative transmission time from the upper limit value is longer than the total transmission time of data transmitted from the power transmission side communication unit 15 in the charging stage. It should be set. As a result, it is possible to avoid in advance a situation in which transmission of high priority data is restricted due to the ratio R being 100% in the middle of the charging stage, resulting in trouble in power transmission. The same applies to the power receiving side communication unit 27.

  In the embodiment, the power transmission side communication unit 15 and the power reception side communication unit 27 determine whether or not to limit data transmission by executing the power transmission request response processing, but the present invention is not limited to this. For example, the controllers 14 and 26 have cumulative data amount storage units 15a and 27a and map data 15b and 27b, and send requests to the communication units 15 and 27 based on the priority of data and the cumulative transmission time. It may be determined whether or not to perform. In this case, when there is a transmission request, the communication units 15 and 27 may transmit the data related to the transmission request without limiting transmission. In such a configuration, each of the controllers 14 and 26 corresponds to a limiting unit. That is, the limiting unit may be the communication unit 15 or 27 or the controller 14 or 26. Further, the restriction unit may be provided separately from the communication units 15 and 27 and the controllers 14 and 26.

  In addition, the communication units 15 and 27 are configured to transmit an ACK signal without receiving a transmission request from the controllers 14 and 26 when receiving signals (data). The structure which determines whether a signal is transmitted may be sufficient.

The reference time is arbitrary, and may be, for example, a time shorter than 1 hour (for example, 30 minutes), a time longer than 1 hour (for example, 24 hours), or the like.
Similarly, the upper limit value of the sum of the data transmission times per reference time is arbitrary, and may be longer than 360 seconds or shorter than 360 seconds.

  In the embodiment, the ratio R of the cumulative transmission time with respect to the upper limit value is adopted as a parameter for determining whether to transmit data. However, the present invention is not limited to this. For example, the ratio of the upper limit value to the cumulative transmission time may be adopted, or the remaining time obtained by subtracting the cumulative transmission time from the upper limit value may be adopted. In this case, it is preferable to set each threshold value that is a criterion for determining whether or not to limit transmission in accordance with the parameter to be adopted.

  In addition, instead of the ratio R, a cumulative data amount may be adopted. In this case, the power transmitting device 11 and the power receiving device 21 are configured such that the accumulated data amount does not exceed the upper limit data amount corresponding to the upper limit value of the sum of the data transmission times per reference time. The transmission of data may be limited based on the ratio, difference, and the like, and the priority of data.

The communication units 15 and 27 may be configured to directly measure the transmission time and grasp the accumulated transmission time.
The specific content of data exchanged between the power transmission side communication unit 15 and the power reception side communication unit 27 is not limited to that of the embodiment, and is arbitrary. For example, data related to the charging state is periodically transmitted from the power receiving side communication unit 27 to the power transmission side communication unit 15, and the power transmission side controller 14 determines whether or not the termination condition is satisfied (the charging state is the fully charged state). Or not) may be determined.

  ○ Transmission of either one of transmission power value data and received power value data may be omitted. Further, transmission of transmitted power value data and transmission of received power value data may be linked or may not be linked. That is, the power receiving side communication unit 27 may be configured to transmit the received power value data based on the reception of the transmitted power value data, or may be determined in advance regardless of the reception timing of the transmitted power value data. The configuration may be such that the received power value data is periodically transmitted at a predetermined cycle.

  O Instead of the configuration in which the power reception side communication unit 27 transmits the search signal, the power transmission side communication unit 15 may periodically transmit a signal (beacon) including the ID data of the power transmission device 11. In this case, the power receiving side controller 26 grasps the power transmission device 11 based on the reception of the beacon by the power receiving side communication unit 27. In addition, when the power receiving side communication unit 27 receives a plurality of types of beacons, the power receiving side controller 26 may determine that there are a plurality of power transmission devices 11 in the communicable area of the power receiving side communication unit 27.

  In such a configuration, the beacon may be set to low priority data or medium priority data. Thereby, a beacon is transmitted in a situation where the transmission time is relatively long, whereas a beacon is not transmitted in a situation where the transmission time is relatively short. Therefore, the power transmission device 11 having the power transmission side communication unit 15 having a relatively long transmission time is grasped by the power receiving side controller 26, while the power transmission side communication unit 15 having a relatively small transmission time is provided. The power transmission device 11 is not grasped by the power receiving side controller 26. As a result, transmission is restricted during the execution of a series of processes (preparation stage and charging stage), and it is difficult for a situation of waiting until the transmission restriction is canceled (cumulative data amount is reset). Therefore, since the data exchange between the communication units 15 and 27 is performed smoothly in the series of processes, the series of processes can be executed smoothly.

  O The configuration related to the identification of the target power transmission device when a plurality of power transmission devices 11 are grasped is not limited to that of the embodiment, and may be arbitrary as long as the target power transmission device can be identified. For example, the power receiving side controller 26 makes a power transmission request so that identification power is input to the primary side coil 13 of each grasped power transmission device 11 over different times. The power receiving side controller 26 grasps the input time of the identification power measured by the measurement unit 25 (hereinafter referred to as measurement time), and the measurement time and the input time of the identification power to the primary coil 13 of each power transmission device 11. And match. And the power receiving side controller 26 may specify the power transmission apparatus 11 which has the primary side coil 13 into which the electric power for identification was input over the input time which corresponds with measurement time as an object power transmission apparatus. In this case, the input power of identification power to the primary coil 13 of each power transmission device 11 (transmission timing of the first power transmission request signal) may be the same.

  In the embodiment, three priorities of “high”, “medium”, and “low” are set in the data. However, the priority is not limited to this, and four or more priorities may be set. . In this case, it is preferable to set a plurality of thresholds for transmission restriction corresponding to each priority.

  Further, the data may have a configuration in which two priorities of “high” and “low” are set. In this case, the processing from step S108 to step S111 or the processing from step S112 to step S115 may be omitted.

  In the embodiment, the data exchanged at the charging stage is the high priority data, but the priority setting mode is arbitrary. For example, data transmitted periodically may be set as low priority data, and data transmitted irregularly may be set as high priority data.

  Each threshold ratio Rth1, Rth2 is not limited to a fixed value, and may be a variable value. For example, the remaining time from the execution timing of the power transmission request handling process to the reset timing may be grasped, and the threshold ratios Rth1 and Rth2 may be set higher as the remaining time becomes shorter. Thereby, it is possible to transmit more data while suppressing the cumulative transmission time from reaching the upper limit value.

  The power transmission end condition is arbitrary. For example, in a configuration in which the power transmission apparatus 11 is provided with an end switch, a case where the end switch is operated may be employed as the end condition. In this case, the power transmission side controller 14 may determine whether or not the end switch has been operated.

  The power transmission device 11 may have a configuration including a plurality of primary coils 13. In this case, the power transmission side communication unit 15 may be configured to establish communication with the same number of power reception side communication units 27 as the primary side coil 13. In this case, congestion may occur when the power transmission side communication unit 15 exchanges data simultaneously with the plurality of power reception side communication units 27. Then, the frequency of data retransmission increases, and the accumulated transmission time easily reaches the upper limit value. On the other hand, it is possible to suppress the cumulative transmission time from reaching the upper limit value by the transmission side communication unit 15 performing transmission restriction as described above.

(Circle) the resonance frequency of the resonance circuit containing the primary side coil 13 and the resonance frequency of the resonance circuit containing the secondary side coil 23 may differ in the range in which electric power transmission is possible.
○ The primary and secondary capacitors may be omitted. In this case, magnetic field resonance may be performed using parasitic capacitances of the primary side coil 13 and the secondary side coil 23.

The AC power received by the secondary coil 23 may be used for purposes other than charging the vehicle battery 22.
O The power receiving device 21 may be mounted on any object, and may be mounted on, for example, a robot or an electric wheelchair.

O The number of power transmission devices 11 is arbitrary, and may be one, for example.
(Circle) the power transmission apparatus 11 may be the structure which has the resonant circuit which consists of the primary side coil 13 and a primary side capacitor | condenser, and the primary side coupling coil couple | bonded with the resonant circuit by electromagnetic induction. The power receiving device 21 may have a configuration including a resonance circuit including the secondary coil 23 and the secondary capacitor, and a secondary side coupling coil coupled to the resonance circuit by electromagnetic induction.

  In the embodiment, the power transmission system 10 (the power transmission device 11 and the power reception device 21) is a non-contact type, but is not limited thereto, and may be a contact type. More specifically, the power transmission device includes a power transmission connector instead of the primary coil 13 as a power transmission unit, and a power transmission cable that connects the power transmission connector and the AC power supply 12. The power receiving apparatus has an inlet (power receiving connector) that can be fitted (connected) to the power transmitting connector as a power receiving unit. The inlet is connected to the charger 24. When the power transmission connector and the inlet are fitted (connected), power is transmitted from the power transmission device to the power reception device via the power transmission cable.

  In such a configuration, the power transmission side communication unit 15 provided in the power transmission device and the power reception side communication unit 27 provided in the power reception device may exchange data with each other wirelessly. Thereby, it is not necessary to exchange data on a wired (power transmission cable). Therefore, since it is not necessary to have a signal line in addition to the power line as the power transmission cable, the configuration can be simplified. Further, since it is possible to avoid noise from entering the signal line from the power line, it is possible to improve the reliability of data exchange. And as mentioned above, each communication part 15 and 27 has effects, such as (1)-(7) mentioned above, by restrict | transmitting according to the accumulation transmission time and priority in reference time.

  In addition, in the configuration in which power transmission is performed by wire, the power to be transmitted is not limited to AC power, and may be DC power. Alternatively, the AC power supply 12 may be omitted and the system power may be directly transmitted.

Next, a preferable example that can be grasped from the embodiment and another example will be described below.
(A) The low threshold cumulative transmission time is equal to the power transmission side in a situation where the remaining transmission time obtained by subtracting the low threshold cumulative transmission time from the upper limit value is the power transmission from the power transmission unit to the power reception unit. The power transmission device according to claim 4, wherein the power transmission device is set to be longer than a total transmission time of data transmitted from the communication unit.

  (B) The accumulated transmission time is reset every time the reference time elapses, and the power transmission side communication unit is limited by the limiting unit so that the low priority data is not transmitted, The power transmission device according to any one of claims 2 to 4 and (A), wherein the low priority data that is restricted from being transmitted is transmitted based on the accumulated transmission time being reset.

  DESCRIPTION OF SYMBOLS 10 ... Electric power transmission system, 11 ... Power transmission apparatus, 13 ... Primary side coil (power transmission part), 14 ... Power transmission side controller, 15 ... Power transmission side communication part, 15a, 27a ... Cumulative data amount storage part, 15b, 27b ... Map Data, 21: Power receiving device, 23: Secondary coil (power receiving unit), 26: Power receiving side controller, 27 ... Power receiving side communication unit.

Claims (8)

A power transmission unit to which power is input;
A power transmission side communication unit for performing wireless communication;
A power receiving device capable of receiving the power input to the power transmitting unit, and a power receiving device that transmits power to the power receiving device having a power receiving side communication unit that performs wireless communication with the power transmission side communication unit,
The upper limit value of the sum total of transmission times of data transmitted from the power transmission side communication unit per predetermined reference time is predetermined,
Priorities are set for each data transmitted from the power transmission side communication unit,
A limiting unit that limits data transmitted from the power transmission side communication unit based on a cumulative transmission time required for transmission of data already transmitted from the power transmission side communication unit within the reference time and the priority; A power transmission device characterized by that. Each data transmitted from the power transmission side communication unit includes high priority data and low priority data in which the priority is relatively high and low,
When the cumulative transmission time is longer than a predetermined low threshold cumulative transmission time within the reference time, the limiting unit does not transmit the low priority data until the reference time has elapsed. The power transmission device according to claim 1, which is limited to   The limiting unit may be a case where the cumulative transmission time is less than the high threshold cumulative transmission time longer than the low threshold cumulative transmission time even when the cumulative transmission time is longer than the low threshold cumulative transmission time. The power transmission device according to claim 2, wherein transmission of the high priority data is not limited.   The power transmission according to claim 3, wherein the high priority data is data transmitted from the power transmission side communication unit to the power reception side communication unit in a situation where power transmission from the power transmission unit to the power reception unit is performed. apparatus. The restriction unit is
A cumulative data amount storage unit that stores a cumulative data amount that is a sum of data amounts of data already transmitted within the reference time;
An update unit that updates the accumulated data amount stored in the accumulated data amount storage unit each time data is transmitted from the power transmission side communication unit;
A calculation unit that calculates the cumulative transmission time using the cumulative data amount stored in the cumulative data amount storage unit;
The power transmission device according to any one of claims 1 to 4, further comprising: When data is transmitted from the power transmission side communication unit to the power reception side communication unit, the power transmission side communication unit is a signal transmitted from the power reception side communication unit and indicates that the data has been received. A determination unit for determining whether or not
The power transmission side communication unit is configured to retransmit the data when the determination unit determines that the reception response signal is not received,
The restriction unit restricts the data from not being retransmitted based on the accumulated transmission time and the priority, or restricts the number of retransmissions of the data. The power transmission device according to one item. In a power receiving device that receives the power from a power transmitting unit to which power is input and a power transmitting device that has a power transmitting side communication unit that performs wireless communication,
A power receiving unit capable of receiving the power input to the power transmitting unit;
A power receiving side communication unit that performs wireless communication with the power transmission side communication unit;
With
An upper limit value of the sum total of transmission times of data transmitted from the power receiving side communication unit per predetermined reference time is predetermined,
Priorities are set for each data transmitted from the power receiving side communication unit,
A limiting unit configured to limit data transmitted from the power receiving communication unit based on an accumulated transmission time and the priority required to transmit data already transmitted from the power receiving communication unit within the reference time; A power receiving device. The power transmission device according to any one of claims 1 to 6,
The power receiving device according to claim 7;
A power transmission system comprising: