Contactless power supply system, control program for contactless power supply system, vehicle, and contactless power receiving device

Abstract

To provide a non-contact power feed system in which an abnormality can be detected separately in power supply segments, and, even when an abnormality occurs in consecutive power supply segments, the abnormality in the power supply segments can be detected, and a control program for the non-contact power feed system, a vehicle, and a non-contact power reception device.SOLUTION: A non-contact power feed system according to the present invention includes a power transmission characteristic acquisition unit that is disposed on a power supply segment side and measures a power transmission characteristic of a power supply segment, a power reception characteristic acquisition unit that is disposed on a vehicle side and measures a power reception characteristic of a vehicle, and abnormality detection means that makes a measurement time period of the power transmission characteristic of the power supply segment measured by the power transmission characteristic acquisition unit coincident with a measurement time period of the power reception characteristic of the vehicle measured by the power reception characteristic acquisition unit, calculates the efficiency of the power supply segment by using the power transmission characteristic of the power supply segment and the power reception characteristic of the vehicle the measurement time periods of which have been made coincident with each other, and determines an abnormality in the power supply segment on the basis of the calculated efficiency.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a contactless power supply system that supplies power to a vehicle in a contactless manner while the vehicle is running, a control program for the contactless power supply system, the vehicle, and a contactless power receiving device. [Background technology]

[0002] Patent Document 1 describes a technology for detecting an abnormality in a power supply segment that contactlessly supplies power to a moving vehicle. Specifically, the technology described in Patent Document 1 shares electrical characteristics with a target segment that is the subject of abnormality determination and at least one of a front segment that supplies power before the target segment and a rear segment that supplies power after the target segment, and determines whether or not there is an abnormality in the electrical characteristics of the target segment by comparing the electrical characteristics of the target segment with at least one of the electrical characteristics of the front segment and the rear segment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-178471 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology described in Patent Document 1 cannot detect an abnormality in a power supply segment individually. Furthermore, if an abnormality occurs in multiple consecutive power supply segments, the abnormality in the power supply segment cannot be detected.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a contactless power supply system, a control program for the contactless power supply system, a vehicle, and a contactless power receiving device that can detect abnormalities in power supply segments individually and can detect abnormalities in power supply segments even when abnormalities occur in multiple consecutive power supply segments. [Means for solving the problem]

[0006] The contactless power supply system of the present invention is a contactless power supply system that supplies power to a traveling vehicle contactlessly from a power supply segment provided on the vehicle's travel path, and includes: a power transmission characteristic acquisition unit provided on the power supply segment side that measures the power transmission characteristics of the power supply segment; a power receiving characteristic acquisition unit provided on the vehicle side that measures the power receiving characteristics of the vehicle; and an abnormality detection means that matches a measurement period of the power transmission characteristics of the power supply segment measured by the power transmission characteristic acquisition unit with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition unit, calculates the efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determines an abnormality in the power supply segment based on the calculated efficiency.

[0007] A control program for a contactless power supply system according to the present invention is a control program for a contactless power supply system that contactlessly supplies power to a traveling vehicle from a power supply segment provided on the vehicle's travel path, and causes a computer to execute a power transmission characteristic acquisition procedure that measures the power transmission characteristics of the power supply segment, a power receiving characteristic acquisition procedure that measures the power receiving characteristics of the vehicle, and an abnormality detection procedure that matches a measurement period of the power transmission characteristics of the power supply segment measured by the power transmission characteristic acquisition procedure with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition procedure, calculates the efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determines an abnormality in the power supply segment based on the calculated efficiency.

[0008] The vehicle of the present invention is a vehicle capable of receiving power from a contactless power supply system that supplies power to a traveling vehicle contactlessly from a power supply segment installed on the vehicle's travel path, and is equipped with a power receiving characteristic acquisition unit that measures the power receiving characteristics of the vehicle, and an alarm device that notifies an abnormality detection means of the contactless power supply system of the measured power receiving characteristics, and causes the abnormality detection means to match the measurement period of the power transmission characteristics of the power supply segment measured by the power transmission characteristic acquisition unit installed on the power supply segment side with the measurement period of the vehicle's power receiving characteristics measured by the power receiving characteristic acquisition unit, calculate the efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle for which the measurement periods have been matched, and determine an abnormality in the power supply segment based on the calculated efficiency.

[0009] The contactless power supply receiving device of the present invention is a contactless power supply receiving device mounted on a vehicle capable of receiving power from a contactless power supply system that supplies power to a traveling vehicle contactlessly from a power supply segment provided on the traveling path of the contactless power supply receiving device vehicle, and includes a power receiving characteristic acquisition unit that measures the receiving characteristics of the vehicle, and an alarm device that notifies an abnormality detection means of the contactless power supply system of the measured receiving characteristics, and causes the abnormality detection means to match a measurement period of the transmission characteristics of the power supply segment measured by a power transmission characteristic acquisition unit provided on the power supply segment side with a measurement period of the receiving characteristics of the vehicle measured by the receiving characteristic acquisition unit, calculates the efficiency of the power supply segment using the transmission characteristics of the power supply segment and the receiving characteristics of the vehicle whose measurement periods have been matched, and determines an abnormality in the power supply segment based on the calculated efficiency. [Effects of the Invention]

[0010] The contactless power supply system, control program for the contactless power supply system, vehicle, and contactless power receiving device of the present invention determine abnormalities in the power supply segment using power information acquired by matching the acquisition timing on the vehicle side and the power supply segment side, so that abnormalities in the power supply segment can be detected individually, and abnormalities in the power supply segment can be detected even if abnormalities occur in multiple consecutive power supply segments. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing the configuration of a contactless power supply system according to one embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing the configuration of the vehicle shown in FIG. [Figure 3] FIG. 3 is a block diagram showing the configuration of the power supply segment shown in FIG. [Figure 4] FIG. 4 is a diagram for explaining the operations of the acquisition timing adjustment unit and the abnormality determination unit of the server device. [Figure 5] FIG. 5 is a diagram illustrating an example of the power supply characteristic. [Figure 6] FIG. 6 is a diagram showing an example of the relationship between the time required for the vehicle to travel 2.6 mm and the vehicle speed. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a contactless power supply system according to an embodiment of the present invention will be described in detail with reference to the drawings.

[0013] Fig. 1 is a block diagram showing the configuration of a contactless power supply system according to one embodiment of the present invention. As shown in Fig. 1, the contactless power supply system 1 according to one embodiment of the present invention is a system that contactlessly supplies power to a running vehicle, and includes a vehicle 2, a power supply segment 3, and a server device 4.

[0014] The vehicle 2 is configured as a well-known vehicle such as an HV (Hybrid Vehicle), an EV (Electric Vehicle), a PHV (Plug-in Hybrid Vehicle), or an FCEV (Fuel Cell Electric Vehicle), and is equipped with a communication module capable of communicating information via a telecommunications network NW such as the Internet network or a mobile phone network. As shown in Fig. 2, the vehicle 2 is equipped with a power receiver 21 that receives power supplied from the power supply segment 3 and a rectifier 22 that rectifies the power received by the power receiver 21. The rectifier 22 supplies the rectified power to various parts of the vehicle 2, such as a battery 23, an auxiliary / air conditioner 24, and a motor 25.

[0015] The vehicle 2 is equipped with an electrical characteristic acquisition unit 26 that measures the waveform of the input power (received power) from the power supply segment 3 to the battery 23. The electrical characteristic acquisition unit 26 transmits information about the measured input power waveform to the battery 23 to the server device 4 via the telecommunications line NW, together with information about the time when the input power waveform to the battery 23 was measured (measurement time information) and information about unique identification information assigned to each vehicle 2 (vehicle ID). Examples of the measurement time information include time information about the measurement time measured using a radio-controlled clock and a count value for the period during which the vehicle 2 is traveling on the power supply segment 3.

[0016] As shown in FIG. 3, the power supply segment 3 includes a rectifier 31 that rectifies a DC voltage from the grid, a plurality of inverters 32a to 32d that convert the DC voltage rectified by the rectifier 31 into an AC voltage, and a plurality of power transmitters 33a to 33d that transmit the AC voltage output from the plurality of inverters 32a to 32d to the vehicle 2.

[0017] The power supply segment 3 includes an electrical characteristic acquisition unit 34 that measures the input power (power transmission) waveforms of the power transmitters 33a to 33d. The electrical characteristic acquisition unit 34 transmits information about the measured input power waveforms of the power transmitters 33a to 33d to the server device 4 via the telecommunications line NW, together with information about the time when the input power waveforms of the power transmitters 33a to 33d were measured (measurement time information), information about unique identification information assigned to each power supply segment 3 (segment ID), and information about the vehicle ID of the vehicle 2 that supplied power. Examples of the measurement time information include time information about the measurement time measured using a radio-controlled clock and a count value for the period during which the vehicle 2 travels on the power supply segment 3. The transmitted information about the input power waveform is information plotted at at least one or more time points (e.g., 2:30:01 second, 2:30:01.1 seconds, etc.). For example, the time when the peak power is reached or the time when the power is half the peak power may be selected as a characteristic point of the input power waveform and transmitted.

[0018] Returning to FIG. 1 , the server device 4 is configured by an information processing device such as a workstation, and is connected to the vehicle 2 and the power supply segment 3 via a telecommunications line NW. The server device 4 communicates information with the vehicle 2 and the power supply segment 3 via the telecommunications line NW. The server device 4 functions as an acquisition timing adjustment unit 41 and an abnormality determination unit 42 by an arithmetic processing unit such as a CPU within the information processing device executing a computer program.

[0019] The acquisition timing adjustment unit 41 acquires information from the electrical characteristic acquisition unit 26 and the electrical characteristic acquisition unit 34 via the telecommunications line NW, and links the input power waveform to the battery 23 and the input power waveform of the power transmitters 33a to 33d related to the same vehicle 2 based on the vehicle ID included in the acquired information. Then, as shown in Figures 4(a) to 4(c), the acquisition timing adjustment unit 41 matches the measurement period of the input power waveform to the linked battery 23 with the measurement period of the input power waveform of the power transmitters 33a to 33d based on the measurement time information included in the acquired information. In the example shown in Figures 4(a) to (c), the rise time of the input power waveform of transmitter A and the rise time of the input power waveform to battery 23 coincide at time T = T2, the rise time of the input power waveform of transmitter B and the rise time of the input power waveform to battery 23 coincide at time T = T4, the extinction time of the input power waveform of transmitter A and the extinction time of the input power waveform to battery 23 coincide at time T = T5, and the extinction time of the input power waveform of transmitter B and the extinction time of the input power waveform to battery 23 coincide at time T = T6.

[0020] The abnormality determination unit 42 determines an abnormality in the power supply segment 3 using the input power waveform to the battery 23 and the input power waveforms of the power transmitters 33a to 33d whose measurement periods are matched by the acquisition timing adjustment unit 41, and notifies a manager or the like of information on the segment ID of the power supply segment 3 determined to be abnormal. For example, in the example shown in FIGS. 4(a) to 4(c), the average charging efficiency of the power transmitter A is calculated by subtracting the amount of power transmitted by the power transmitter B from the time T=T2 to T5 from the amount of power received by the battery 23 from the time T=T2 to T5, and dividing the result by the amount of power transmitted by the power transmitter A from the time T=T2 to T5. If the calculated average charging efficiency is not within a predetermined range, the abnormality determination unit 42 determines that an abnormality exists in the power transmitter A and notifies a manager or the like of the segment ID of the power transmitter A. Similarly, the abnormality determination unit 42 determines an abnormality in the power transmitter B. Note that the abnormality determination unit 42 may perform the abnormality determination using the charging efficiency at any timing instead of the average charging efficiency. In this case, however, the arbitrary timing excludes timings when multiple power transmitters are driven (for example, times T=T4 to T5 shown in Figs. 4(a) to 4(c)). Note that times T=T1 and T3 shown in Figs. 4(a) to 4(c) indicate timings when power transmitter A and power transmitter B are permitted to supply power, respectively.

[0021] As is clear from the above description, in the contactless power supply system 1 according to one embodiment of the present invention, the server device 4 matches the measurement period of the input power waveform to the battery 23 with the measurement period of the input power waveform to the power transmitters 33a to 33d, and then determines whether or not an abnormality has occurred in the power supply segment 3 based on the efficiency of the power supply segment 3 calculated from the input power waveform to the battery 23 and the input power waveform to the power transmitters 33a to 33d. This makes it possible to detect an abnormality in each power supply segment 3 individually, and also makes it possible to detect an abnormality in a power supply segment 3 even when abnormalities have occurred in multiple consecutive power supply segments 3.

[0022] [Definition of match] In in-motion power transfer, the relative positions of the receiver and transmitter change constantly as the vehicle moves. This change in position can also be seen as a change in the upper limit of the power supply (ease of power transmission). For example, if power is continuously supplied at the upper limit without controlling the power supply, a deviation in the power waveform measurement period can result in a large difference in the power used to compare efficiencies between the vehicle side and the power supply segment side. The Weights and Measures Act stipulates that the upper limit of measurement accuracy (measurement error) is 5% for up to 50 kW and 3% for up to 500 kW. Furthermore, the catalog value for measurement accuracy is 2.5%. This indicates that a high measurement accuracy, such as 3%, is required for power measurement. Here, if the upper limit of measurement accuracy is 3%, and the sensor's measurement accuracy is 2.5%, there is only a 0.5% margin of error in measurement accuracy, and errors (changes in conditions) exceeding 0.5% are not acceptable. For this reason, the definition of "match" mentioned above requires that changes in conditions be within 0.5%.

[0023] For example, if the length of the power receiver is 1.5 m, the available power characteristics are as shown in Figure 5. The available power characteristics shown in Figure 5 are normalized by the position of the power receiver relative to the power transmitter. As shown in Figure 5, a 15 cm change in the relative position of the power receiver and power transmitter results in a 28% fluctuation in the power value. Therefore, considering a 0.5% fluctuation range, a 2.6 mm difference results in a 0.5% fluctuation, so a power acquisition timing accuracy of 2.6 mm or less is required. Figure 6 shows the time corresponding to 2.6 mm as a function of vehicle speed. Setting the time corresponding to coincidence to 50 μs or less can cover most vehicle speeds. While the length of the power receiver in this example is 1.5 m, if the length were half that, at 0.75 m, the time corresponding to coincidence would also be half that, at 25 μs or less. The specific value of coincidence varies depending on the size of the power receiver and power transmitter and the vehicle's traveling speed.

[0024] [Calibration of electrical characteristics acquisition section] An apparatus for measuring the lateral deviation position and ground clearance of the vehicle may be arranged around the measurement power transmitter, the amount of power when the vehicle passes the measurement power transmitter may be measured, and if there is a difference between the measured amount of power and the amount of power calculated from the efficiency of the combination of the device's measurement value and the amount of power, the conversion gain of the vehicle-side electrical characteristic acquisition unit may be adjusted to reduce the difference. Also, an apparatus for measuring the lateral deviation position and ground clearance may be arranged on the vehicle, the amount of power when the vehicle passes the measurement power transmitter may be measured, and if there is a difference between the measured amount of power and the amount of power calculated from the combination of the device's measurement value, the conversion gain of the power segment-side electrical characteristic acquisition unit may be adjusted to reduce the difference.

[0025] Although the present invention has been described above as an embodiment, the present invention is not limited to the description and drawings that form part of the disclosure of the present invention. In other words, other embodiments, examples, and operational techniques that can be made by those skilled in the art based on the present invention are all included in the scope of the present invention. [Explanation of symbols]

[0026] 1. Contactless power supply system 2 vehicles 3. Power Supply Segment 4. Server equipment 21 Power receiver 22 Rectifier 23 Battery 24 Auxiliary equipment / air conditioner 25 motor 26 Electrical characteristics acquisition section 31 Rectifier 32a~32d Inverter 33a~33d Power transmitter 41 Acquisition timing adjustment unit 42 Abnormality determination section NW telecommunications line

Claims

1. A wireless power supply system that supplies power to a traveling vehicle from a power supply segment provided on a traveling path of the vehicle in a wireless manner, a power transmission characteristics acquisition unit provided on the power supply segment side, which measures the power transmission characteristics of the power supply segment; a power receiving characteristic acquisition unit provided on the vehicle side that measures the power receiving characteristics of the vehicle; an abnormality detection means for matching a measurement period of the power transmission characteristics of the power supply segment measured by the power transmission characteristic acquisition unit with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition unit, calculating an efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determining an abnormality in the power supply segment based on the calculated efficiency; A contactless power supply system comprising:

2. A control program for a contactless power supply system that supplies power to a traveling vehicle from a power supply segment provided on a traveling path of the vehicle in a contactless manner, the control program comprising: a power transmission characteristics acquisition step of measuring the power transmission characteristics of the power supply segment; a power receiving characteristics acquisition step of measuring the power receiving characteristics of the vehicle; an abnormality detection procedure for matching a measurement period of the power transmission characteristics of the power supply segment measured by the power transmission characteristic acquisition procedure with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition procedure, calculating an efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determining an abnormality in the power supply segment based on the calculated efficiency; A control program for a wireless power supply system that causes a computer to execute the above.

3. A vehicle capable of receiving power from a wireless power supply system that supplies power to a traveling vehicle in a wireless manner from a power supply segment provided on a traveling path of the vehicle, a power receiving characteristic acquisition unit that measures the power receiving characteristics of the vehicle; a notification device that notifies the abnormality detection means of the contactless power supply system of the measured power receiving characteristics; Equipped with a vehicle in which the abnormality detection means matches a measurement period of the power transmission characteristics of the power supply segment measured by a power transmission characteristics acquisition unit provided on the power supply segment side with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition unit, calculates the efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determines an abnormality in the power supply segment based on the calculated efficiency.

4. A wireless power supply receiving device mounted on a vehicle capable of receiving power from a wireless power supply system that supplies power to a traveling vehicle in a wireless manner from a power supply segment provided on a traveling path of the vehicle, a power receiving characteristic acquisition unit that measures the power receiving characteristics of the vehicle; a notification device that notifies the abnormality detection means of the contactless power supply system of the measured power receiving characteristics; Equipped with a wireless power supply receiving device that causes the abnormality detection means to match a measurement period of the power transmission characteristics of the power supply segment measured by a power transmission characteristic acquisition unit provided on the power supply segment side with a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition unit, calculates the efficiency of the power supply segment using the power transmission characteristics of the power supply segment and the power receiving characteristics of the vehicle whose measurement periods have been matched, and determines an abnormality in the power supply segment based on the calculated efficiency.

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