JP7243477B2 - power supply system - Google Patents

Description

The present disclosure relates to power feeding systems.

2. Description of the Related Art A power supply system is known that supplies power to a vehicle equipped with a power receiving device while the vehicle is moving. For example, Patent Literature 1 discloses a technology for detecting a foreign object located near a power supply device in a power supply system.

Japanese Patent Publication No. 2016-506714

In the power supply system described in Patent Document 1, foreign matter is detected by, for example, changes in inductance and voltage of detection windings embedded in the road. However, not limited to this, another technology that can detect a foreign object in a power supply system has been desired.

According to one aspect of the present disclosure, there is provided a power supply system (100) that supplies power to a power receiving device (205) mounted on a vehicle (200). This power supply system includes a power supply device (110) that supplies electric power to the power receiving device, and a planar sensor (120) that is provided on the road surface located below the vehicle in the vicinity of the power supply device and detects magnetic flux changes. ), and said detection indicating a change in movement including at least one of a magnitude of a detection value of a signal detected by said flat-surface type sensor, a change in the detection position of said signal in time series, and the presence or absence of periodicity of said signal. a foreign object detection unit (130) for detecting a foreign object according to a detection pattern that is a combination of time-series information of values ;

According to the power supply system of this aspect, the foreign matter detection section can detect foreign matter according to the pattern of the signal detected by the flat laying type sensor.

It is an explanatory view showing an outline of composition of a power supply system. FIG. 4 is an explanatory diagram showing an example of the arrangement of flat laying type sensors; FIG. 4 is an explanatory diagram showing an example of a state in which a foreign object is detected; FIG. 4 is a diagram showing an example of a detection pattern of signals detected by a weight sensor; It is a figure which shows an example of the detection pattern of the signal which the electrostatic capacitance sensor detected. FIG. 4 is a diagram showing an example of detection patterns of signals detected by loop coils; 6 is a flowchart showing an example of foreign object detection processing;

A. Embodiment:
As shown in FIG. 1, power supply system 100 is a system capable of supplying power while vehicle 200 equipped with power receiving device 205 is running. Vehicle 200 is configured as, for example, an electric vehicle or a hybrid vehicle. The power supply system 100 includes a power supply device 110 installed on a road RS, a flat-surface installation type sensor 120, a foreign object detection unit 130, and a notification device 140. FIG. In FIG. 1, the x-axis direction indicates the traveling direction of the vehicle 200, the y-axis direction indicates the width direction of the vehicle 200, and the z-axis direction indicates the vertically upward direction. These axes correspond to the axes shown in FIG. 2 onwards.

Vehicle 200 includes a power receiving device 205, a main battery 230, a motor generator 240, an inverter circuit 250, a DC/DC converter circuit 260, an auxiliary battery 270, an auxiliary device 280, and a control device 290. there is The power receiving device 205 has a power receiving resonance circuit 210 and a power receiving circuit 220 .

The power receiving resonance circuit 210 includes a power receiving coil and a resonance capacitor, and is a device that obtains AC power induced in the power receiving coil by an electromagnetic induction phenomenon with a power transmission resonance circuit 111 in the power supply device 110 described later. The power receiving circuit 220 is a circuit that converts AC power output from the power receiving resonance circuit 210 into DC power. A specific configuration example of the power receiving circuit 220 will be described later. The DC power output from the power receiving circuit 220 can be used to charge the main battery 230 as a load, charge the auxiliary battery 270, drive the motor generator 240, and drive the auxiliary device 280. is also available.

Main battery 230 is a secondary battery that outputs DC power for driving motor generator 240 . Motor generator 240 operates as a three-phase AC motor and generates driving force for running vehicle 200 . Motor generator 240 operates as a generator during deceleration of vehicle 200 and generates three-phase AC power. Inverter circuit 250 converts the DC power of main battery 230 into three-phase AC power to drive motor generator 240 when motor generator 240 operates as a motor. When motor generator 240 operates as a generator, inverter circuit 250 converts the three-phase AC power output from motor generator 240 into DC power and supplies the DC power to main battery 230 .

DC/DC converter circuit 260 converts the DC voltage of main battery 230 into a lower DC voltage and supplies it to auxiliary battery 270 and auxiliary device 280 . Auxiliary battery 270 is a secondary battery that outputs DC power for driving auxiliary device 280 . Auxiliary device 280 is a peripheral device such as an air conditioner or an electric power steering device.

Control device 290 controls each part in vehicle 200 . Control device 290 controls power receiving circuit 220 to receive power when receiving contactless power supply while the vehicle is running.

The power supply device 110 includes a plurality of power transmission resonant circuits 111, a plurality of power transmission circuits 112 that supply AC power to the plurality of power transmission resonant circuits 111, and a power supply circuit 113 that supplies DC power to the plurality of power transmission circuits 112. ing.

The plurality of power transmission resonance circuits 111 are installed on or in the road surface of the road RS along the traveling direction of the vehicle 200 (hereinafter also referred to as "extending direction of the road RS"). The power transmission resonance circuit 111 includes a power transmission coil and a resonance capacitor.

Each of the power transmission circuits 112 is a circuit that converts DC power supplied from the power supply circuit 113 into high-frequency AC power and applies the high-frequency AC power to the power transmission coil of the power transmission resonance circuit 111 . The power supply circuit 113 is a circuit that supplies DC power to the power transmission circuit 112 . For example, the power supply circuit 113 is configured as an AC/DC converter circuit that rectifies an AC voltage of an external power supply and outputs a DC voltage.

The power transmission resonance circuit 111 and the power transmission circuit 112 that supplies AC power to the power transmission resonance circuit 111 are treated as one segment. In this embodiment, the power supply device 110 includes a plurality of segments arranged along the extending direction of the road surface. FIG. 1 shows five segments from the i−2 th segment Segi−2 to the i+2 th segment Segi+2. In the following description, when there is no particular need to distinguish between segments, the code indicating the number of the segment, such as "i" appended at the end, may be omitted. The length of segment Seg in the extending direction of road RS is preferably shorter than the length of vehicle 200 . Note that the power transmission resonant circuit 111 and the power transmission circuit 112 do not necessarily have to be treated as one segment. 112 may be connected. In this case, the power transmission circuit 112 stops power transmission by controlling the power transmission section switching circuit. The power transmission switching circuit is a circuit that switches whether to send a signal sent from the power transmission circuit to the power transmission resonance circuit 111 .

The flat laying type sensor 120 is, for example, a sensor including one or more of a pressure sensor, a weight sensor, a capacitance sensor, a loop coil, and the like. It is preferable that the planar-laying type sensor 120 can detect at least one or more of gravity, pressure, changes in capacitance, and changes in magnetic flux. As shown in FIG. 2 , planar installation type sensor 120 is provided on the ground around power supply device 110 and below vehicle 200 . More specifically, like the power transmission resonance circuit 111, it is installed on or in the road surface of the road RS along the extending direction of the road RS. In this embodiment, the flat sensor 120 is installed so as to cover the power transmission resonance circuit 111 in the width direction and the extension direction of the road RS, but may be installed below the power transmission resonance circuit 111 . The planar installation type sensor 120 is preferably provided in a wider range than the power transmission resonance circuit 111 of the power supply device 110 in at least one of the width direction and the extension direction of the road RS. Further, in the present embodiment, the flat surface installation type sensor 120 is provided for each segment. Note that the planar installation type sensor 120 may be provided for each range narrower than the segment.

The foreign matter detection unit 130 detects a foreign matter on the road RS according to the detection pattern of the signal detected by the flat laying type sensor 120, and detects the position of the foreign matter according to the position of the flat laying type sensor 120 that detected the signal. . Foreign object detection unit 130 can control notification device 140 (shown in FIG. 1) to notify detection of a foreign object. For example, when a foreign object is detected and the foreign object is a living body, the foreign matter detection unit 130 outputs a signal to the notification device 140 to notify the living body. As a result, the living body can be encouraged to move. Further, when a foreign object is detected and the foreign object is an inanimate object, the foreign object detection unit 130 sends a signal to the notification device 140 to notify the road administrator that the foreign object has been detected and the position of the foreign object. to output This allows the road administrator to remove the foreign matter.

In this embodiment, the foreign object detection unit 130 can control the power transmission circuit 112 to stop supplying power to the segment corresponding to the position where the foreign object is detected and to the surrounding segments. It is preferable that the foreign object detection unit 130 can control the power supply circuit 113 so as to stop supplying power to at least the segment corresponding to the position where the foreign object is detected. As shown in FIG. 3, for example, when the foreign object detection unit 130 detects the foreign object 300 at the position of the segment segN, the segment segN, which is the hatched area in FIG. control the power supply circuit 113 to stop supplying power to segment segN+1 and segment segN+1;

The foreign matter detection unit 130 detects foreign matter according to the detection pattern of the signals of the flat laying type sensor 120 shown in FIGS. In the present embodiment, the "signal detection pattern" is information combining detection values, time-series information, and characteristics of each sensor, as shown in FIGS. More specifically, for example, as shown in FIG. 4, when the detection value detected by the pressure sensor or weight sensor is large, there is a change in movement, and pressure or gravity is detected at four locations at the same time, the four-wheel vehicle It is a detection pattern of a signal. In this embodiment, "movement change" means, for example, that the position of the signal detected by the planar-installation type sensor 120 moves in time-series along a plurality of segments in the traveling direction or width direction of the road RS. show. In other words, the "movement change" indicates the position change of the signal detected by the flat laying type sensor 120, and the change of the detection position of the detection signal continuously due to the movement of the vehicle and the discrete detection due to the movement of the living body. Refers to the transition of the detection position of the signal. Further, the signal detection pattern may be information obtained by combining information obtained by two or more types of sensors. For example, as shown in FIGS. 5 and 6, it is a detection pattern of a biological signal when detected by a capacitive sensor and not detected by a loop coil. The signal detection pattern can be determined in advance by conducting simulations and experiments.

Further, as shown in FIG. 4, the foreign object detection unit 130 uses the detection pattern of the signal of the pressure sensor or the weight sensor to determine whether the detection signal is due to vibration caused by a large vehicle running on the road RS or due to power supply. It can be determined that it is the generated noise. When the detection value detected by the pressure sensor or the gravity sensor is small and detected periodically, that is, when there is periodicity, it is a detection pattern of a signal of vibration or noise. The noise signal detection pattern can be determined in advance by conducting simulations and experiments.

The foreign object detection process shown in FIG. 7 is a process in which the foreign object detection unit 130 detects the foreign object 300 on the road RS. This process is a process repeatedly executed by the foreign object detection unit 130 while the power supply system 100 is in operation. This process may be performed not only when power supply system 100 supplies power to vehicle 200 but also periodically.

First, in step S100, the foreign object detection unit 130 acquires a signal detected by the planar installation type sensor 120. As shown in FIG. The detection signal to be acquired is not limited to the signal detected by the flat laying type sensor 120 most recently, and may be a detection signal in a predetermined period. This makes it possible to obtain changes in the time series of the detection signal. Next, in step S110, the detection signal acquired in step S100 is used to refer to whether or not it corresponds to the above-described signal detection pattern.

Subsequently, in step S120, foreign object detection unit 130 determines whether or not foreign object 300 is detected. More specifically, it is determined whether or not the detection signal acquired in step S110 corresponds to the detection pattern of the foreign object signal. If the foreign object 300 is not detected, the foreign object detection unit 130 determines in step S145 that power can be supplied, and ends the foreign object detection process. On the other hand, if the foreign object 300 is detected, the foreign object detection unit 130 proceeds to step S130.

Foreign object detection unit 130 determines whether or not a vehicle has been detected in step S130. More specifically, it is determined whether or not the detection signal acquired in step S110 corresponds to the detection pattern of the signal of a four-wheeled vehicle or a two-wheeled vehicle. If the vehicle is detected, the foreign object detection unit 130 proceeds to step S145 and ends the foreign object detection process. On the other hand, if the vehicle is not detected, foreign object detection unit 130 determines in step S140 to stop power supply to the segment corresponding to the position where foreign object 300 other than a vehicle is detected. The segment corresponding to the position where the foreign object 300 is detected is determined according to the position of the flat laying type sensor 120 that detected the signal acquired in step S100. When power supply system 100 is not supplying power to vehicle 200, foreign object detection unit 130 controls power supply circuit 113 so as not to supply power.

Subsequently, in step S150, foreign object detection unit 130 determines whether or not foreign object 300 detected in step S120 is a living body. If the foreign object 300 is a living body, the foreign body detection unit 130 uses the notification device 140 to notify the living body to move in step S160, and returns to the process of step S100. In this case, the notification device 140 is, for example, a speaker that emits ultrasonic waves or warning sounds. On the other hand, if the foreign object is not a living body, the foreign object detection unit 130 notifies the road administrator using the notification device 140 in step S165, and returns to step S100. In this case, the notification device 140 is, for example, a device that performs communication to instruct the road administrator to remove the foreign object 300 . Foreign object detection unit 130 returns to the process of step S100 after performing the process of step S160 or step S165. In other words, the foreign object detection process is repeatedly executed until the foreign object 300 is no longer detected. Note that step S140 may be executed after steps S160 and S165, or may be executed in parallel.

According to the power supply system 100 of the present embodiment described above, the foreign object detection unit 130 can detect the foreign object 300 different from the vehicle 200 according to the detection pattern of the signal detected by the flat laying type sensor 120 . In addition, since the planar installation type sensor 120 is provided in a wider range than the power transmission resonant circuit 111 of the power supply device 110 in the width direction of the road RS, for example, when a person crosses the road surface, the sensor 120 is located above the power transmission resonant circuit 111. It can be detected as a foreign object 300 before it moves to. Therefore, the foreign object detection unit 130 can control the notification device 140 to prompt movement, or stop the power supply from the power supply device 110 to avoid supplying power to the segment where the living body exists. . Further, the planar installation type sensor 120 is provided in a wider range than the power transmission resonance circuit 111 of the power supply device 110 in the extending direction of the road RS. That is, the flat sensor 120 is provided in a wider range than the power transmission resonance circuit 111 at the switching point between the section of the road RS where the power supply device 110 is installed and the section where the power supply device 110 is not installed. Therefore, the foreign object 300 can be detected before it moves above the power transmission resonant circuit 111 .

B. Other embodiments:
(B1) In the above-described embodiment, the power supply device 110 includes a plurality of segments each having one power transmission resonant circuit 111 and one power transmission circuit 112 . Alternatively, the feed device 110 may comprise only one segment. More specifically, the power supply device 110 may be configured to include one power transmission resonance circuit 111 and one power transmission circuit 112 .

(B2) In the above-described embodiments, the power supply system is configured to perform contactless power supply. Alternatively, the power supply system may be configured to provide power by contact. Specifically, the power supply device 110 includes, for example, a power supply rail on the road RS as the power transmission resonance circuit 111 . The power receiving device 205 mounted on the vehicle 200 may include, for example, a power receiving pad as the power receiving resonance circuit 210, and includes a movable arm that moves downward in the vehicle and an arm driving unit that moves the arm. is brought into contact with the power supply rail to supply direct current. The power receiving device 205 may not have an arm, and for example, the power transmitting resonant circuit 111 and the power receiving device 205 may always be in contact.

(B3) In the above-described embodiment, the foreign object detection unit 130 detects a foreign object obtained from a sensor different from the flat laying type sensor 120 (hereinafter referred to as "another sensor") in addition to the detection signal of the flat laying type sensor 120. A foreign object may be detected using detection information related to. In the present embodiment, the “other sensors” include, for example, various sensors such as a camera, laser radar, millimeter wave radar, and ultrasonic sensor mounted on the vehicle 200, and cameras, laser radar, and millimeter sensors installed on the road RS. They are various sensors such as wave radar and ultrasonic sensors. For example, when it is difficult to determine whether a foreign object is a living object or an inanimate object from the signal detected by the flat-surface-laying type sensor 120, if another sensor detects movement of the foreign object, it can be determined that the foreign object is a living object. According to this embodiment, since the detection signal can be shared, the foreign object 300 can be detected more accurately and the type of the foreign object can be determined.

(B4) In the above-described embodiment, the material arranged around the flat laying type sensor 120 may be changed according to the type of the flat laying type sensor 120 . For example, if the flat laying type sensor 120 is a weight sensor, a material having elasticity or flexibility can be used, and if the flat laying type sensor 120 is a loop coil, a magnetic material can be used.

(B5) In the above-described embodiment, the foreign object detection unit 130 detects a foreign object and determines the type of foreign object according to the detection pattern of the signal detected by the flat laying type sensor 120 . Instead of this, or in addition to this, the foreign object detection unit 130 may detect a foreign object and determine the type of foreign object according to the detection value of the signal detected by the flat laying type sensor 120 . For example, as shown in FIG. 4, the foreign object detection unit 130 can determine that a four-wheeled vehicle is detected when the detection value of the pressure sensor is large. Further, as shown in FIG. 5, the foreign object detection unit 130 can determine that a foreign object other than the vehicle is detected if the detection value of the capacitance sensor is not small.

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in each form described in the outline of the invention are In addition, it is possible to perform replacement and combination as appropriate. Moreover, if the technical feature is not described as essential in this specification, it can be deleted as appropriate.

REFERENCE SIGNS LIST 100 power supply system 110 power supply device 111 power transmission resonance circuit 112 power transmission circuit 113 power supply circuit 120 planar installation type sensor 130 foreign object detection unit 140 notification device 200 vehicle 205 power receiving device 300 foreign object RS road

Claims (7)

A power supply system (100) for supplying power to a power receiving device (205) mounted on a vehicle (200),
a power supply device (110) that supplies power to the power receiving device;
a flat laying type sensor (120) provided on a road surface located below the vehicle in the vicinity of the power supply device and detecting a change in magnetic flux ;
The magnitude of the detection value of the signal detected by the flat-surface type sensor, and the time of the detection value indicating a change in movement including at least one of a change in the detection position of the signal in time series and the presence or absence of periodicity of the signal. A power supply system, comprising: a foreign object detection unit (130) that detects a foreign object according to a detection pattern that is a combination of series information . The power supply system according to claim 1,
The flat-surface-laying sensor further senses at least one or more of weight, pressure, and changes in capacitance ,
The power supply system , wherein the foreign matter detection unit determines whether the foreign matter is a vehicle, a living body, or an inanimate object according to the detection pattern . The power supply system according to claim 1 or claim 2 ,
The power supply system, wherein the planar installation type sensor is provided in a wider range than the power supply device in at least one of a width direction of the vehicle on the road surface and an extension direction of the road surface. The power supply system according to any one of claims 1 to 3 ,
The power supply device has a plurality of segments arranged along the extending direction of the road surface, and when the foreign object detection unit detects the foreign object, supplies power to the segment corresponding to the position where the foreign object is detected. Power supply system to stop. The power supply system according to any one of claims 1 to 4 ,
The power supply system, wherein the foreign matter detection unit outputs a signal to a notification device (140) to notify the living body when the foreign matter is detected and the foreign matter is a living body. The power supply system according to any one of claims 1 to 5 ,
The power supply system, wherein the foreign object detection unit outputs a signal to a notification device to notify a road administrator when the foreign object is detected and the foreign object is an inanimate object. The power supply system according to any one of claims 1 to 6 ,
The power feeding system, wherein the foreign matter detection unit detects the foreign matter using detection information regarding the detection of the foreign matter acquired from a sensor different from the flat laying type sensor.

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