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

Abstract

This non-contact power supply system is provided with: a power transmission characteristic acquisition unit that is provided on the power supply section side and that measures the power transmission characteristics of the power supply section; a power reception characteristic acquisition unit that is provided on the vehicle side and that measures the power reception characteristics of the vehicle; and an abnormality detection means that matches the measurement period of the power transmission characteristics of the power supply section measured by the power transmission characteristic acquisition unit with the measurement period of the power reception characteristics of the vehicle measured by the power reception characteristic acquisition unit. The efficiency of the power supply section is calculated using the power transmission characteristics of the power supply section and the power reception characteristics of the vehicle in which the measurement periods match, and the abnormality of the power supply section is determined on the basis of the calculated efficiency.

Description

Technical Field

[0001] The present invention relates to a contactless power supply system for supplying electric power to a traveling vehicle in a contactless manner, a control program for the contactless power supply system, a vehicle, and a contactless power supply and receiving device. Background Art

[0002] Patent document 1 describes a technique for detecting an abnormality in a power supply section that supplies power to a moving vehicle in a non-contact manner. Specifically, in the technique described in patent document 1, an electrical characteristic is shared between a target section, which is a target of abnormality determination, and at least one of a front section that supplies power before the target section and a rear section that supplies power after the target section, and the electrical characteristic of the target section is compared with at least one of the electrical characteristic of the front section and the electrical characteristic of the rear section to determine whether there is an abnormality in the electrical characteristic of the target section.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-178471 Summary of the invention

[0006] According to the technology described in Patent Document 1, it is not possible to detect abnormalities in power supply sections independently. In addition, when abnormalities occur in a plurality of consecutive power supply sections, it is not possible to detect abnormalities in the power supply sections.

[0007] The present invention has been completed in view of the above-mentioned problems, and its purpose is to provide a contactless power supply system that can independently detect abnormalities in power supply sections and can detect abnormalities in power supply sections even when abnormalities occur in multiple consecutive power supply sections, a control program for the contactless power supply system, a vehicle, and a contactless power supply receiving device.

[0008] The present invention provides a contactless power supply system for contactlessly supplying power to a moving vehicle from a power supply section arranged on a driving path of the vehicle, wherein the contactless power supply system comprises: a power transmission characteristic acquisition unit, arranged on the power supply section side, for measuring the power transmission characteristics of the power supply section; a power receiving characteristic acquisition unit, arranged on the vehicle side, for measuring the power receiving characteristics of the vehicle; and an abnormality detection unit, which makes the measurement period of the power transmission characteristics of the power supply section measured by the power transmission characteristic acquisition unit and the measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition unit consistent, uses the power transmission characteristics of the power supply section and the power receiving characteristics of the vehicle that make the measurement periods consistent to calculate the efficiency of the power supply section, and determines the abnormality of the power supply section based on the calculated efficiency.

[0009] The present invention provides a control program for a contactless power supply system, wherein the contactless power supply system supplies power to a moving vehicle in a contactless manner from a power supply section arranged on a driving path of the vehicle, wherein a computer is caused to execute: a power transmission characteristic acquisition step for measuring the power transmission characteristic of the power supply section; a power receiving characteristic acquisition step for measuring the power receiving characteristic of the vehicle; and an abnormality detection step for making the measurement period of the power transmission characteristic of the power supply section measured by the power transmission characteristic acquisition step and the measurement period of the power receiving characteristic of the vehicle measured by the power receiving characteristic acquisition step consistent, using the power transmission characteristic of the power supply section and the power receiving characteristic of the vehicle that make the measurement period consistent to calculate the efficiency of the power supply section, and judging the abnormality of the power supply section based on the calculated efficiency.

[0010] The present invention provides a vehicle capable of receiving electricity from a contactless power supply system, wherein the contactless power supply system supplies power to the traveling vehicle contactlessly from a power supply section arranged on a driving path of the vehicle, wherein the vehicle comprises: a power receiving characteristics acquisition unit for measuring the power receiving characteristics of the vehicle; and a reporting device for reporting the measured power receiving characteristics to an abnormality detection unit of the contactless power supply system, wherein for the abnormality detection unit, a measurement period of the power transmission characteristics of the power supply section measured by a power transmission characteristics acquisition unit arranged on the power supply section side and a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition unit are made consistent, the power transmission characteristics of the power supply section whose measurement periods are consistent and the power receiving characteristics of the vehicle are used to calculate the efficiency of the power supply section, and the abnormality of the power supply section is determined based on the calculated efficiency.

[0011] The present invention provides a contactless power supply and receiving device, which is mounted on a vehicle capable of receiving power from a contactless power supply system, wherein the contactless power supply system supplies power to the traveling vehicle contactlessly from a power supply section arranged on a traveling path of the vehicle, wherein the contactless power supply and receiving device comprises: a power receiving characteristic acquisition unit, which measures the power receiving characteristics of the vehicle; and a reporting device, which reports the measured power receiving characteristics to an abnormality detection unit of the contactless power supply system, wherein for the abnormality detection unit, a measurement period of the power transmission characteristics of the power supply section measured by a power transmission characteristic acquisition unit arranged on the power supply section side and a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristic acquisition unit are made consistent, the power transmission characteristics of the power supply section whose measurement periods are consistent and the power receiving characteristics of the vehicle are used to calculate the efficiency of the power supply section, and the abnormality of the power supply section is determined based on the calculated efficiency.

[0012] The contactless power supply system, the control program of the contactless power supply system, the vehicle and the contactless power supply receiving device involved in the present invention use the power information obtained by aligning the acquisition timing on the vehicle side and the power supply section side to determine the abnormality of the power supply section, so that the abnormality of the power supply section can be detected independently, and even when the abnormality occurs in multiple consecutive power supply sections, the abnormality of the power supply section can be detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 1 is a block diagram showing a configuration of a contactless power supply system as one embodiment of the present invention.

[0014] Figure 2 It is shown Figure 1 A block diagram of the structure of the vehicle is shown.

[0015] Figure 3 It is shown Figure 1 Block diagram of the structure of the power supply section shown.

[0016] Figure 4 This is a diagram for explaining the operations of the acquisition timing adjustment unit and the abnormality determination unit of the server device.

[0017] Figure 5 This is a diagram showing an example of characteristics of power that can be supplied.

[0018] Figure 6 This is a diagram showing an example of the relationship between the time required for a vehicle to travel 2.6 mm and the vehicle speed. DETAILED DESCRIPTION

[0019] Hereinafter, a contactless power supply system as one embodiment of the present invention will be described in detail with reference to the drawings.

[0020] Figure 1 1 is a block diagram showing the structure of a contactless power supply system as one embodiment of the present invention. Figure 1 As shown, a contactless power supply system 1 as one embodiment of the present invention is a system for contactlessly supplying power to a traveling vehicle, and includes a vehicle 2 , a power supply section 3 , and a server device 4 .

[0021] The vehicle 2 includes a 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 provided with a communication module capable of performing information communication via an electric communication line NW such as an Internet line network or a mobile phone line network. Figure 2 As shown, the vehicle 2 includes a power receiver 21 that receives power supplied from the power supply section 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, auxiliary equipment / air conditioner 24, and a motor 25.

[0022] The vehicle 2 is provided with an electrical characteristic acquisition unit 26 for measuring the waveform of the input power (power received) from the power supply section 3 to the battery 23. The electrical characteristic acquisition unit 26 transmits information on the measured waveform of the input power to the battery 23, information on the time when the waveform of the input power to the battery 23 is measured (measurement time information), and information on the inherent identification information assigned to each vehicle 2 (vehicle ID), to the server device 4 via the electrical communication line NW. As the measurement time information, time information of the measurement time measured using a radio clock and a count value during the period when the vehicle 2 is traveling in the power supply section 3 can be exemplified.

[0023] like Figure 3 As shown, the power supply section 3 includes: a rectifier 31 for rectifying the DC voltage from the system; a plurality of inverters 32a~32d for converting the DC voltage rectified by the rectifier 31 into an AC voltage; and a plurality of power transmitters 33a~33d for transmitting the AC voltage output from the plurality of inverters 32a~32d to the vehicle 2.

[0024] The power supply section 3 includes an electrical characteristic acquisition unit 34 for measuring the input power (power transmission) waveform of the power transmitters 33a to 33d. The electrical characteristic acquisition unit 34 transmits information about the measured input power waveform of the power transmitters 33a to 33d, information about the time when the input power waveform of the power transmitters 33a to 33d was measured (measurement time information), information about the inherent identification information assigned to each power supply section 3 (section ID), and information about the vehicle ID of the vehicle 2 supplying power to the server device 4 via the electrical communication line NW. As the measurement time information, time information of the measurement time measured using a radio clock and a count value during the period when the vehicle 2 travels in the power supply section 3 can be exemplified. In addition, the information about the input power waveform to be transmitted may be information depicted at least at one or more times (2:30:01, 2:30:1.1, etc.), for example, the time when the peak power is reached, the time when the peak power is half, etc. are picked up and transmitted as the characteristic points of the input power waveform.

[0025] Return to Figure 1The server device 4 is composed of an information processing device such as a workstation, and is connected to the vehicle 2 and the power supply section 3 via the electrical communication line NW. The server device 4 communicates information with the vehicle 2 and the power supply section 3 via the electrical communication line NW. The server device 4 executes a computer program by a CPU or other computing device inside the information processing device, and functions as an acquisition timing adjustment unit 41 and an abnormality determination unit 42.

[0026] The acquisition timing adjustment unit 41 acquires information from the electrical characteristics acquisition unit 26 and the electrical characteristics acquisition unit 34 via the electrical communication line NW, and associates 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. Figure 4 As shown in (a) to (c), the acquisition timing adjustment unit 41 makes the measurement period of the input power waveform to the battery 23 and the measurement period of the input power waveform of the power transmitters 33a to 33d consistent with each other based on the measurement time information included in the acquired information. Figure 4 In the examples shown in (a) to (c), the rising edge timing of the input power waveform of power transmitter A and the rising edge timing of the input power waveform to battery 23 coincide at time T=T2, the rising edge timing of the input power waveform of power transmitter B and the rising edge timing of the input power waveform to battery 23 coincide at time T=T4, the arc extinction timing of the input power waveform of power transmitter A and the arc extinction timing of the input power waveform to battery 23 coincide at time T=T5, and the arc extinction timing of the input power waveform of power transmitter B and the arc extinction timing of the input power waveform to battery 23 coincide at time T=T6.

[0027] The abnormality determination unit 42 determines the abnormality of the power supply section 3 using the input power waveform to the battery 23 and the input power waveform of the power transmitters 33a to 33d whose measurement periods are made consistent by the acquisition timing adjustment unit 41, and notifies the manager etc. of information related to the section ID of the power supply section 3 determined to be abnormal. Figure 4In the examples shown in (a) to (c), the average charging efficiency of power transmitter A is calculated by subtracting the amount of power transmitted by power transmitter B during time T=T4-T5 from the amount of power received by battery 23 during time T=T2-T5, and dividing the value by the amount of power transmitted by power transmitter A during time T=T2-T5. Furthermore, when the calculated average charging efficiency is not within a predetermined range, the abnormality determination unit 42 determines that there is an abnormality in power transmitter A, and notifies the manager, etc. of the segment ID of power transmitter A. Similarly, the abnormality determination unit 42 determines that there is an abnormality in power transmitter B. The abnormality determination unit 42 may perform abnormality determination using the charging efficiency at an arbitrary timing instead of the average charging efficiency. However, in this case, the timing for driving multiple power transmitters (for example, Figure 4 (a) to (c) The time T shown is T4 to T5). Figure 4 The times T= T1 and T3 shown in (a) to (c) respectively indicate the timings at which the power transmitter A and the power transmitter B are permitted to supply power.

[0028] As can be seen from the above description, in the contactless power supply system 1 as one embodiment of the present invention, the server device 4 makes the measurement period of the input power waveform to the battery 23 and the measurement period of the input power waveform to the power transmitters 33a to 33d coincide, and then determines whether an abnormality has occurred in the power supply section 3 based on the efficiency of the power supply section 3 obtained from the input power waveform to the battery 23 and the input power waveform to the power transmitters 33a to 33d. Thus, the abnormality of the power supply section 3 can be detected independently, and even when the abnormality occurs in a plurality of consecutive power supply sections 3, the abnormality of the power supply section 3 can be detected.

[0029] 〔Agreeable Definition〕

[0030] During the power supply while driving, the positional relationship between the power receiver and the power transmitter changes every moment due to the driving of the vehicle. The change in this positional relationship is also called the change in the upper limit value of the power supply (the ease of transmission of power). For example, when the power supply waveform is shifted during the measurement period when the power supply is continuously supplied at the upper limit value of the power supply without controlling the power supply, a large difference is generated in the power used for comparing efficiency on the vehicle side and the power supply section side. In the metering method, for ~50kW, the upper limit of the measurement accuracy (measurement error) is determined to be 5%, and for ~500kW, the upper limit of the measurement accuracy (measurement error) is determined to be 3%. In addition, the nominal value of the measurement accuracy is 2.5%. It can be seen that the requested measurement accuracy when measuring power under such conditions requires a relatively high measurement accuracy of 3%. When the measurement accuracy of the sensor is 2.5% in the process where the upper limit of the measurement accuracy is determined to be 3%, there is only a margin of 0.5% in the measurement accuracy, and an error (condition change) exceeding 0.5% is not allowed. Therefore, as the definition of the above-mentioned "consistency", the condition change that converges to a change less than 0.5% is a necessary condition.

[0031] For example, when the length of the power receiver is 1.5 m, the power characteristics that can be supplied are as follows: Figure 5 shown. Figure 5 The power characteristics that can be supplied are parameters obtained by normalizing the power characteristics that can be supplied by using the position of the power receiver relative to the power transmitter. Figure 5 As shown in the figure, the power value changes by 28% due to a 15cm change in the positional relationship between the power receiver and the power transmitter. Therefore, when viewed from the perspective of a 0.5% change range, since a 2.6mm offset changes by 0.5%, the power acquisition timing accuracy of less than 2.6mm is required as the distance. When arranging the time corresponding to the vehicle speed with respect to 2.6mm, as shown in the figure below, Figure 6 As shown in FIG. 1 , if the time corresponding to the agreement is set to 50 μs or less, it can be said that most vehicle speeds can be covered. However, in this example, the length of the power receiver is set to 1.5 m. If the length is half of 0.75 m, the time corresponding to the agreement is also half of 25 μs or less. The specific value of the agreement varies depending on the size of the power receiver and the power supply and the driving speed of the vehicle.

[0032] [Calibration of the electrical characteristics acquisition unit]

[0033] It is also possible to arrange a device for measuring the lateral offset position and the height above the ground of the vehicle around the measuring power transmitter, measure the amount of electric power when the vehicle passes through the measuring power transmitter, and when there is a difference between the measured amount of electric power and the amount of electric power calculated based on the efficiency of the combination of the measured value of the device and the amount of electric power, adjust the conversion gain of the electrical characteristic acquisition unit on the vehicle side so as to reduce the difference. It is also possible to arrange a device for measuring the lateral offset position and the height above the ground on the vehicle, measure the amount of electric power when the vehicle passes through the measuring power transmitter, and when there is a difference between the measured amount of electric power and the amount of electric power calculated based on the combination of the measured value of the device, adjust the conversion gain of the electrical characteristic acquisition unit on the power section side so as to reduce the difference.

[0034] The above describes the implementation of the invention completed by the inventor, but the present invention is not limited to the description and drawings of a part of the disclosure of the present invention involved in this implementation. That is, other implementations, examples, and application technologies completed by those skilled in the art based on this implementation are all included in the scope of the present invention.

[0035] Industrial Applicability

[0036] According to the present invention, a contactless power supply system, a control program for the contactless power supply system, a vehicle, and a contactless power supply receiving device can be provided that can independently detect abnormalities in power supply sections and can detect abnormalities in power supply sections even when abnormalities occur in multiple consecutive power supply sections.

[0037] (Explanation of symbols)

[0038] 1: non-contact power supply system; 2: vehicle; 3: power supply section; 4: server device; 21: power receiver; 22: rectifier; 23: battery; 24: auxiliary equipment / air conditioner; 25: motor; 26: electrical characteristic acquisition unit; 31: rectifier; 32a~32d: inverter; 33a~33d: power transmitter; 41: acquisition timing adjustment unit; 42: abnormality determination unit; NW: electrical communication line.

Claims

1. A contactless power supply system for contactlessly supplying power to a traveling vehicle from a power supply section provided on a traveling path of the vehicle, wherein: The contactless power supply system comprises: a power transmission characteristic acquisition unit, provided on the power supply section side, for measuring the power transmission characteristic of the power supply section; a power receiving characteristic acquisition unit, provided on the vehicle side, for measuring the power receiving characteristic of the vehicle; as well as The abnormality detection unit makes the measurement period of the power transmission characteristics of the power supply section measured by the power transmission characteristics acquisition unit and the measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition unit consistent, calculates the efficiency of the power supply section using the power transmission characteristics of the power supply section and the power receiving characteristics of the vehicle that make the measurement periods consistent, and determines the abnormality of the power supply section based on the calculated efficiency.

2. A control program of a contactless power supply system for supplying power to a traveling vehicle in a contactless manner from a power supply section provided on a traveling path of the vehicle, wherein: The control program causes the computer to execute: a power transmission characteristic acquisition step of measuring the power transmission characteristic of the power supply section; a power receiving characteristics obtaining step of measuring the power receiving characteristics of the vehicle; and The abnormality detection step makes the measurement period of the power transmission characteristics of the power supply section measured by the power transmission characteristics acquisition step and the measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition step consistent, uses the power transmission characteristics of the power supply section and the power receiving characteristics of the vehicle that make the measurement periods consistent to calculate the efficiency of the power supply section, and determines the abnormality of the power supply section based on the calculated efficiency.

3. A vehicle capable of receiving power from a contactless power supply system, wherein the contactless power supply system supplies power to the vehicle in motion in a contactless manner from a power supply section provided on a driving path of the vehicle, wherein: The vehicle has: a power receiving characteristic acquisition unit that measures a power receiving characteristic of the vehicle; and a reporting device for reporting the measured power receiving characteristics to the abnormality detection unit of the contactless power supply system, For the abnormality detection unit, a measurement period of the power transmission characteristics of the power supply section measured by a power transmission characteristics acquisition unit provided on the power supply section side and a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition unit are made consistent, the efficiency of the power supply section is calculated using the power transmission characteristics of the power supply section and the power receiving characteristics of the vehicle whose measurement periods are made consistent, and the abnormality of the power supply section is determined based on the calculated efficiency.

4. A contactless power supply and receiving device, mounted on a vehicle capable of receiving power from a contactless power supply system, wherein the contactless power supply system supplies power to the traveling vehicle contactlessly from a power supply section provided on a traveling path of the vehicle, wherein: The contactless power supply and receiving device comprises: a power receiving characteristic acquisition unit that measures a power receiving characteristic of the vehicle; and a reporting device for reporting the measured power receiving characteristics to the abnormality detection unit of the contactless power supply system, For the abnormality detection unit, a measurement period of the power transmission characteristics of the power supply section measured by a power transmission characteristics acquisition unit provided on the power supply section side and a measurement period of the power receiving characteristics of the vehicle measured by the power receiving characteristics acquisition unit are made consistent, the efficiency of the power supply section is calculated using the power transmission characteristics of the power supply section and the power receiving characteristics of the vehicle whose measurement periods are made consistent, and the abnormality of the power supply section is determined based on the calculated efficiency.

Images