JP6180023B2 - Position shift detection device and non-contact power feeding device - Google Patents

Description

  The present invention relates to a positional deviation detection device that detects a positional deviation between a power feeding coil and a power receiving coil in a non-contact power feeding device, and to a non-contact power feeding device including such a positional deviation detection device.

  In recent years, a non-contact power supply device that supplies power to, for example, a battery of an electric vehicle without mechanical contact such as a cable has been developed and put into practical use. This non-contact power feeding device includes a power receiving coil mounted on a vehicle and a power feeding coil that powers the power receiving coil in a non-contact manner.

  FIG. 7 is a schematic diagram showing a conventional non-contact power feeding device. In the non-contact power feeding device 5 shown in FIG. 7, the vehicle 6 is parked at the parking place 7, and the power supply coil 51 and the power receiving coil 52 are opposed to each other with a gap therebetween, and the inverter 54 is connected from the power source 53. AC power is supplied to the power supply coil 51 through the power supply. Then. The AC power is fed from the feeding coil 51 to the receiving coil 52 in a non-contact manner due to electromagnetic induction between the coils and magnetic field resonance. The AC power supplied to the power receiving coil 52 is supplied to the secondary battery 61 via the charging circuit 55 and charged. From the secondary battery 61, AC power is supplied via an inverter 65 to a motor 64 as a drive source together with the engine 63.

  Here, depending on the parking position of the vehicle 6, a positional deviation occurs between the power feeding coil 51 and the power receiving coil 52. As for the longitudinal direction of the vehicle 6, for example, the positional deviation can be avoided relatively easily by using facilities usually provided in a parking place such as a car stop. , Often left to the driver's driving. FIG. 8 is a diagram showing a positional relationship in the vehicle width direction between the power feeding coil and the power receiving coil shown in FIG. FIG. 8A shows a state in which no positional deviation occurs in the vehicle width direction between the power feeding coil 51 and the power receiving coil 52, and FIG. 8B shows the power feeding coil 51, the power receiving coil 52, and the like. A state in which a positional deviation occurs in the vehicle width direction is shown. When the misalignment occurs, the transmission distance D between the power feeding coil 51 and the power receiving coil 52 changes as shown in FIG. 8, and this causes a change between the power feeding coil 51 and the power receiving coil 52. Impedance and transmission coefficient change. Then, problems such as an increase in the leakage magnetic field, a decrease in power supply efficiency, and heat generation in the power supply coil 51 occur between the power supply coil 51 and the power reception coil 52. Therefore, it is detected whether or not the power feeding coil 51 and the power receiving coil 52 are misaligned in the vehicle width direction when entering the parking place, and if there is a misalignment, the passenger is notified of this and the approach direction is corrected. The following technologies have been proposed.

  For example, in a parking place, there is a technique in which a plurality of magnets are embedded on a center line passing through the center of the power feeding coil, and a pair of reed switches are arranged on the vehicle on both sides of the center line passing through the center of the power receiving coil. It has been proposed (see, for example, Patent Document 1). In this technology, when the vehicle center line at the time of entering the parking place is displaced from the center line of the parking place, that is, when there is a position deviation in the vehicle width direction between the feeding coil and the receiving coil, When the lead switch is turned on, the positional deviation is detected and the detection result is notified to the passenger.

JP 2012-16106 A

  However, the technique described in Patent Document 1 has a problem that it costs much to embed a plurality of magnets in a parking place. Further, it is necessary to make the embedment strong so that the magnet is not damaged even when it is stepped on a vehicle tire, or the magnet itself needs to be made strong. . In addition, in terms of being stepped on the tire of a vehicle, there is a problem that the reliability of the positional deviation detection device cannot be denied, no matter how strong the magnet is or how hard it is embedded. Furthermore, if the buried surface is not uniform or there is a variation in the magnetic force of the magnet, there is a possibility that the misalignment may be erroneously detected even though the misalignment does not actually occur. There is also a problem that the cost increases in that it is necessary to embed a magnet so as to eliminate the point.

  Therefore, the present invention provides a highly reliable positional deviation detection device that can detect a positional deviation between a power feeding coil and a power receiving coil at low cost, and a non-contact power feeding device including such a positional deviation detection device. The purpose is to provide.

  In order to solve the above-described problem, a positional deviation detection device according to claim 1 is a non-contact power supply coil that is installed in a state where at least a part projects from the ground at a parking place of a vehicle and is mounted on the vehicle without contact. In the position shift detection device that detects a position shift between the power receiving coil and the power receiving coil that is fed from the power feeding coil, the distance from the ground of the parking place that is provided on the bottom surface of the vehicle and includes the power feeding coil is set to any one A detection unit that detects a direction over a wider range than the width of the power supply coil, and a detection level of the detection unit in a state in which there is no deviation in which a deviation degree between the power supply coil and the power reception coil is within a predetermined level is stored. A storage unit, a detection level of the detection unit when the vehicle enters the parking place, and a detection level of the no-shift state stored in the storage unit. A comparator for compare, based on the comparison result in said comparison section, characterized in that and a determining section for determining the presence or absence of the positional displacement.

  According to a second aspect of the present invention, in the positional deviation detection device according to the first aspect, the detection unit is configured so that the detection portion of the feeding coil extends along a vehicle width direction substantially parallel to a tire axle on a bottom surface of the vehicle. The three or more sensors are arranged over a wider range than the width, each of which detects a distance from the ground of the parking place, and the storage unit detects each of the three or more sensors in the no-shift state. Level is stored, the comparison unit, the detection level of each of the three or more sensors when the vehicle enters the parking place, the detection level of the state without deviation stored in the storage unit, And the determination unit determines the presence or absence of the positional deviation in the vehicle width direction based on the comparison result in the comparison unit.

  According to a third aspect of the present invention, in the positional deviation detection device according to the first or second aspect, the determination unit is arranged below the detection unit based on a comparison result in the comparison unit. The presence or absence of an object other than the feeding coil is also determined.

  The positional deviation detection device according to claim 4 is the positional deviation detection device according to any one of claims 1 to 3, wherein the comparison is performed when the judgment unit determines that the positional deviation is present. The image processing apparatus further includes a calculation unit that calculates the degree of positional deviation based on the result.

  In order to solve the above problem, a non-contact power feeding device according to claim 5 is a non-contact power feeding device that is installed in a vehicle parking place with at least a part protruding from the ground and mounted on the vehicle. 5. A power receiving coil that is fed by contact from the power feeding coil, and a positional shift detecting device according to claim 1 that detects a positional shift between the power feeding coil and the power receiving coil. It is characterized by that.

  According to the position shift detection device according to claim 1, the parking place where the parking place where the feeding coil is installed can be used as it is, and the construction such as the embedding of the magnet as in the technique described in Patent Document 1 above. Is unnecessary, and the cost is reduced accordingly. In addition, the detection of the positional deviation is used by storing the detection level of the detection unit in the state of no deviation at the parking place used in the storage unit. For this reason, even if there are some irregularities in the parking place or there is some variation in the detection accuracy of the detection unit over the wide range, the detection level stored in the storage unit is not limited to these conditions. Therefore, the position shift detection itself is performed regardless of these conditions. As a result, it is not necessary to evenly level the ground of the parking place or to use an expensive detection unit with small variations in detection accuracy, and the cost can be reduced in this respect as well. Furthermore, there is no concern that the detection unit is mounted on a vehicle and is stepped on by a tire, and it is not necessary to use a more robust detection unit. Thus, according to the position shift detection device described in claim 1, it is possible to detect the position shift between the power feeding coil and the power receiving coil at a low cost. Further, since there is no concern that the detection unit is stepped on the tire, the positional deviation detection device described in claim 1 is highly reliable.

  According to the positional deviation detection device according to claim 2, for example, the positional deviation in the vehicle width direction, which is difficult to avoid by a vehicle stop placed at a parking place, is detected by each of the three or more sensors. It can be detected using the result. In addition, as a sensor here, an ultrasonic sensor is mentioned, for example. In recent years, an ultrasonic sensor is often mounted for the purpose of avoiding a collision in recent vehicles, and the positional deviation detection device according to claim 2 is realized by adding such an ultrasonic sensor. In this respect, the cost can be reduced.

  The positional deviation detecting device according to claim 3 detects the presence of the foreign substance without erroneously detecting the positional deviation when, for example, any foreign substance is placed in the parking place. It has a high quality.

  According to the positional deviation detection device of the fourth aspect, when there is a positional deviation, the degree of deviation of the positional deviation is calculated. For example, when the approach direction of the vehicle is corrected using the automatic assist function However, even when the passenger corrects the approach direction by driving, the positional deviation can be eliminated with high accuracy.

  According to the non-contact power feeding device described in claim 5, since the positional shift detection device is the positional shift detection device according to any one of claims 1 to 4, The positional deviation from the power receiving coil can be detected at low cost, and the reliability of the detection is high.

It is a schematic diagram which shows the non-contact electric power feeder provided with the position shift detection apparatus concerning embodiment of this invention. It is a block diagram showing a position shift detection apparatus. It is a schematic diagram which shows the detection level of an ultrasonic sensor when a vehicle moves on the flat surface without an unevenness | corrugation. It is a schematic diagram which shows the detection level of an ultrasonic sensor when a vehicle approachs a parking place in the state without the deviation in which the deviation | shift degree between a feeding coil and a receiving coil was settled in the predetermined degree. It is a schematic diagram which shows the detection level of an ultrasonic sensor in case the position shift of a vehicle width direction exists between a feeding coil and a receiving coil. It is a schematic diagram which shows the detection level of an ultrasonic sensor in case there exist objects other than a power feeding coil under a receiving coil. It is a schematic diagram which shows the conventional non-contact electric power feeder. It is a figure which shows the positional relationship about the vehicle width direction of the feed coil and receiving coil which are shown by FIG.

  A non-contact power feeding apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a schematic diagram illustrating a non-contact power feeding device including a positional deviation detection device according to an embodiment of the present invention. The non-contact power feeding device 1 shown in FIG. 1 includes a power feeding coil 11 installed at a parking place 3 and a power receiving coil 21 mounted on the vehicle 2. The power feeding from the power feeding coil 11 to the power receiving coil 21 is performed in a non-contact manner by electromagnetic induction between the coils or magnetic field resonance. In addition, the feeding coil 11 is installed in the parking place 3 with the upper portion protruding from the ground. The non-contact power feeding device 1 includes a power source and an inverter that are embedded in the parking place 3 and supplies AC power to the power feeding coil 11, and these configurations are, for example, the conventional configurations described with reference to FIG. 7. This is the same as the non-contact power supply device 5. For this reason, illustration is abbreviate | omitted in FIG. 1, and the description about these structures is omitted below.

  Here, the parking place 3 is provided with two vehicle stops 31 on which the two tires 22 on the rear side of the vehicle 2 abut. At the time of parking, the vehicle 2 enters until the two rear tires 22 come into contact with the vehicle stop 31. Due to this contact, in this embodiment, the positional deviation between the feeding coil 11 and the receiving coil 21 is avoided in the front-rear direction B1 of the parking place 3. On the other hand, the vehicle width direction B2 is left to the passenger's driving. Therefore, the non-contact power feeding device 1 includes a positional deviation detection device 4 that detects the presence / absence of a positional deviation in the vehicle width direction B2 and notifies the passenger.

  The positional deviation detection device 4 includes five ultrasonic sensors 41 (sensors) that emit ultrasonic waves toward the ground and receive reflected waves. These five ultrasonic sensors 41 (detecting units) are arranged in a line substantially parallel to the axle of the tire 22 on the vehicle rear end side of the power receiving coil 21 on the bottom surface of the vehicle 2. This arrangement extends over a wider range than the width of the feeding coil 11 in the vehicle width direction B2. Such an arrangement of the ultrasonic sensors 41 assumes that the vehicle 2 is parked backwards as indicated by the arrow S in FIG. 1 in which the approach direction of the vehicle 2 to the parking place 3 is indicated. Thus, when approaching by backward parking, the array of the ultrasonic sensors 41 first passes over the feeding coil 11 prior to the power receiving coil 21. At the time of this passage, the presence / absence of positional deviation is detected and notified. Then, when the passenger receives a notification that there is a positional deviation, the passenger tries to correct the approach direction to eliminate the positional deviation with reference to the notification.

  Hereinafter, the positional deviation detection device 4 including these five ultrasonic sensors 41 will be described. FIG. 2 is a block diagram illustrating a position shift detection device. As shown in FIG. 2, the positional deviation detection device 4 includes the five ultrasonic sensors 41, the storage unit 42, the comparison unit 43, the determination unit 44, the calculation unit 45, and the notification unit 46. Yes.

  The storage unit 42 stores the detection levels of the five ultrasonic sensors 41 in a no-shift state in which the degree of deviation between the power feeding coil 11 and the power receiving coil 21 is within a predetermined level in the vehicle width direction B2. The storage by the storage unit 42 is performed, for example, when the occupant enters the vehicle 2 with no deviation and performs a predetermined storage operation at the beginning of use of the parking place 3. Thereafter, unless the stored content is updated by the passenger, the detection level stored at this time is used for detecting the positional deviation.

  The comparison unit 43 detects the detection levels of the five ultrasonic sensors 41 when the vehicle 2 enters the parking place 3, and the detection levels of the five ultrasonic sensors 41 stored in the storage unit 42 in a state without deviation. And compare. The determination unit 44 determines whether or not there is a positional shift in the vehicle width direction B2 when the vehicle 2 enters the parking place 3 based on the comparison result in the comparison unit 43. The determination unit 44 also determines the presence / absence of an object other than the power feeding coil 11 below the power receiving coil 21 based on the comparison result. When the determination unit 44 determines that there is a position shift, the calculation unit 45 calculates the position shift degree based on the comparison result. Then, the notification unit 46 receives the determination result on the presence / absence of the positional deviation by the determination unit 44, the determination result on the presence / absence of an object other than the feeding coil 11, and the calculation result on the deviation degree by the calculation unit 45. Notify In this embodiment, this notification is performed by a meter display (not shown).

  Next, the positional deviation detection process performed by the positional deviation detection device 4 will be described with reference to specific detection examples by the five ultrasonic sensors 41.

  FIG. 3 is a schematic diagram showing the detection level of the ultrasonic sensor when the vehicle moves on a flat surface without unevenness. FIG. 4 is a schematic diagram illustrating the detection level of the ultrasonic sensor in a state where there is no deviation in which the degree of deviation between the power feeding coil and the power receiving coil is within a predetermined degree in the vehicle width direction. FIG. 5 is a schematic diagram showing the detection level of the ultrasonic sensor when there is a positional deviation in the vehicle width direction between the power feeding coil and the power receiving coil. FIG. 6 is a schematic diagram illustrating the detection level of the ultrasonic sensor when there is an object other than the feeding coil below the power receiving coil. Part (a) of each figure shows a schematic view of the vehicle 2 as viewed from the front in the approach direction to the parking place 3, and part (b) shows detection of each of the five ultrasonic sensors 41 in each case. Levels are shown as bar graphs. In each bar graph G, the sensor position is taken on the horizontal axis, and the sensor output is taken on the vertical axis.

  As described above, the ultrasonic sensor 41 emits an ultrasonic wave toward the ground and receives a reflected wave, and the detection level is a level corresponding to the distance between the ultrasonic sensor 41 and the surface on which the ultrasonic wave hits. Become. Therefore, as shown in FIG. 3, when the vehicle moves on a flat surface without unevenness and the five ultrasonic sensors 41 pass on such a flat surface, the five ultrasonic sensors 41. The detection levels are substantially equal to each other. On the other hand, when the five ultrasonic sensors 41 pass over an object protruding from the ground, as shown in FIGS. 4 to 6, the detection level of the ultrasonic sensor 41 positioned above the object decreases. To do.

  Here, when the vehicle 2 enters the parking place 3 without the above-mentioned deviation, as shown in FIG. 4, the three ultrasonic sensors 41 located at the center of the array protrude from the ground. It passes over the feeding coil 11 that is present. And at the time of this passage, the detection level of these three ultrasonic sensors 41 of the center falls. The degree of reduction at this time is the same between the three ultrasonic sensors 41 because the upper surface of the feeding coil 11 is a flat surface.

  On the other hand, when there is a positional shift in the vehicle width direction, the detection level of the ultrasonic sensor 41 at a position shifted in either the left or right direction is lower than that in the case of no shift. In the example of FIG. 5, the vehicle 2 is shifted to the left in the drawing with respect to the feeding coil 11, and as a result, the detection levels of the three ultrasonic sensors 41 at the positions shifted to the right in the drawing are lowered. ing. However, the degree of reduction at this time is the same between the three ultrasonic sensors 41.

  When an object T other than the feeding coil 11 is placed at the parking place 3 and the array of the ultrasonic sensors 41 passes over the object T, as shown in FIG. The detection level of the ultrasonic sensor 41 that passes immediately above decreases. At this time, the degree of the reduction depends on the height of the object T. In the example of FIG. 6, two objects T having different heights are placed at the parking place 3. As a result, the detection level of the second ultrasonic sensor 41 from the left and the rightmost ultrasonic sensor 41 in the figure decreases, and the level of the decrease is that of the right end passing over the relatively high object T. The sonic sensor 41 is larger.

  In the present embodiment, the detection level of each ultrasonic sensor 41 shown in FIG. Then, the comparison unit 43 compares the detection levels of the five ultrasonic sensors 41 when the vehicle 2 enters the parking place 3 with the detection levels stored in the storage unit 42. The determination unit 44 has a predetermined difference or more between the detection level of each ultrasonic sensor 41 and each detection level stored in the storage unit 42. The difference is, for example, shown in FIG. ), When the position of the ultrasonic sensor 41 having a low detection level is only shifted in the vehicle width direction B2, it is determined that the position shift has occurred in the vehicle width direction B2. On the other hand, a difference of a predetermined degree or more between the detection level of each ultrasonic sensor 41 and each detection level stored in the storage unit 42 is irregular as shown in FIG. 6B, for example. If the object is not, it is determined that an object T other than the feeding coil 11 exists below the ultrasonic sensor 41.

  Further, if the determination unit 44 determines that a positional deviation has occurred in the vehicle width direction B2, the calculation unit 45, for example, on the left side, for example, the ultrasonic sensor 41 based on the comparison result in the comparison unit 43 at that time. The degree of deviation is calculated so as to be one of the two or two ultrasonic sensors 41 on the right.

  Although the notification method in the notification unit 46 is not specified here, for example, the degree of deviation in the vehicle width direction B2 is displayed on the meter, the presence of the object T as described above is displayed in characters, or these A method of notifying information by voice is mentioned. Upon receiving these notifications, the passenger corrects the approach direction of the vehicle 2 to the parking place 3, or when the necessity is felt, the passenger T temporarily stops the vehicle 2 and places the object T placed in the parking place 3. It will be irritated.

  According to the positional deviation detection device 4 of the present embodiment described above, the parking place 3 can use the parking place 3 where the feeding coil 11 is installed as it is, and a magnet as in the technique described in Patent Document 1 above. Construction such as burial is unnecessary, and the cost is reduced accordingly. Further, the detection of the positional deviation is used by storing the detection levels of the five ultrasonic sensors 41 in the state of no deviation at the parking place 3 to be used in the storage unit 42. For this reason, even if there is some unevenness in the parking place 3 and there is some variation in the detection accuracy of the ultrasonic sensor 41, the detection level stored in the storage unit 42 is in accordance with these conditions. Since the value is below, the position shift detection itself is performed regardless of these conditions. As a result, it is not necessary to evenly level the ground of the parking place 3 or to use an expensive ultrasonic sensor with small variation in detection accuracy, and the cost can be reduced in this respect. Further, there is no concern that the ultrasonic sensor 41 is mounted on the vehicle 2 and is stepped on the tire 22, and it is not necessary to select a particularly robust ultrasonic sensor. Furthermore, in recent years, an ultrasonic sensor is often mounted on a vehicle in recent years for the purpose of collision avoidance, and the positional deviation detection device 4 of the present embodiment can be increased by adding such an ultrasonic sensor. This can be realized, and the cost can be reduced in this respect. Thus, according to the position shift detection device 4 of the present embodiment, the position shift between the power feeding coil 11 and the power receiving coil 21 can be detected at low cost. Further, since there is no concern that the ultrasonic sensor 41 used for detection is stepped on the tire 22, the positional deviation detection device 4 is highly reliable.

  In addition, the positional deviation detection device 4 of the present embodiment detects the positional deviation in the vehicle width direction, which is difficult to avoid by a vehicle stop placed at the parking place 3, and the detection results of the five ultrasonic sensors 41. Can be detected.

  Further, the positional deviation detection device 4 of the present embodiment detects the presence of the foreign substance without erroneously detecting the positional deviation when, for example, any foreign substance is placed in the parking place 3. It is highly reliable.

  Further, according to the positional deviation detection device 4 of the present embodiment, when there is a positional deviation, the passenger is notified of the degree of the positional deviation, so for example, the approach direction of the vehicle 2 is corrected to correct the positional deviation. It is convenient when solving the problem.

  The above-described embodiment is merely a representative form of the present invention, and the present invention is not limited to this embodiment. That is, various modifications can be made without departing from the scope of the present invention.

  For example, in this embodiment, five ultrasonic sensors 41 arranged in a row are illustrated as an example of the detection unit according to the present invention, but the detection unit according to the present invention is not limited to this, for example, A non-contact concavo-convex sensor or the like that detects the concavo-convex shape of the ground of the parking place by a surface may be used.

  In this embodiment, the ultrasonic sensor 41 is illustrated as an example of the sensor according to the present invention. However, the sensor according to the present invention is not limited to this, and may be a sensor that can detect a distance from the ground. Any type is acceptable.

  Further, in the present embodiment, as an arrangement form of the ultrasonic sensors, a form in which five ultrasonic sensors are arranged in a line substantially parallel to the axle is illustrated, but is not limited thereto. The ultrasonic sensor is arranged in such a manner that three or more ultrasonic sensors are arranged in a line substantially parallel to the axle, and the ultrasonic sensor is arranged in a line in the direction orthogonal to the axle and intersecting the arrangement. It may be a cross-like arrangement in which three or more are arranged. With such a cross-shaped arrangement, it is possible to detect a positional shift not only in the vehicle width direction but also in the traveling direction of the vehicle. Further, the arrangement form of the ultrasonic sensors may be a two-dimensional arrangement in which three or more sensor arrays in which three or more ultrasonic sensors are arranged substantially parallel to the axle are arranged in a direction perpendicular to the axle. Good. With such a two-dimensional arrangement, it is possible to detect a rotational shift around an arbitrary rotation center.

  Further, in the present embodiment, an example in which the ultrasonic sensor is arranged on the vehicle rear end side of the power receiving coil on the assumption that the vehicle is parked rearward is illustrated. It is not limited to. For example, assuming that the vehicle is parked forward, the ultrasonic sensor may be arranged on the vehicle front end side of the power reception coil, and the vehicle rear end of the power reception coil so as to support both rearward parking and forward parking. It is good also as both a side and a vehicle front end side.

  Further, in this embodiment, as an embodiment of the positional deviation detection device according to the present invention, an embodiment provided with a notification unit that notifies the passenger of the determination result of the presence / absence of positional deviation, etc. is illustrated. In response to the notification, the direction of entry of the vehicle is corrected by driving, and if necessary, the object placed in the parking area is moved away. However, the position deviation detection device according to the present invention is not limited to such a form, and a notification unit is not provided, and the vehicle approach direction is automatically determined by, for example, an automatic assist function based on the determination result of the presence or absence of position deviation. For example, the correction or the object placed at the parking place may be ignored in the process of the automatic assist function because it is not related to the positional deviation.

DESCRIPTION OF SYMBOLS 1 Non-contact electric power feeder 2 Vehicle 3 Parking place 4 Position shift detection apparatus 11 Power supply coil 21 Power receiving coil 41 Ultrasonic sensor 42 Memory | storage part 43 Comparison part 44 Judgment part 45 Calculation part 46 Notification part

Claims (5)

A positional deviation for detecting a positional deviation between a power feeding coil installed at least partially protruding from the ground at a parking place of the vehicle and a power receiving coil mounted on the vehicle and fed from the power feeding coil in a non-contact manner. In the detection device,
A detection unit that is provided on the bottom surface of the vehicle and detects a distance from the ground of the parking place including the power supply coil over a wider range than the width of the power supply coil in at least one arbitrary direction;
A storage unit for storing a detection level of the detection unit in a state without a deviation in which a deviation degree between the power feeding coil and the power receiving coil is within a predetermined range;
A comparison unit that compares the detection level of the detection unit when the vehicle enters the parking place and the detection level of the non-shift state stored in the storage unit;
A determination unit that determines presence or absence of the positional deviation based on a comparison result in the comparison unit;
A positional deviation detection device comprising: The detectors are arranged on the bottom surface of the vehicle over a wider range than the width of the power supply coil along a vehicle width direction substantially parallel to the axle of the tire, and each detects a distance from the ground of the parking place. Consisting of three or more sensors,
The storage unit stores detection levels of the three or more sensors in the non-shift state,
The comparison unit compares the detection level of each of the three or more sensors when the vehicle enters the parking place with the detection level of the no-shift state stored in the storage unit,
The position shift detection device according to claim 1, wherein the determination unit determines the presence or absence of the position shift in a vehicle width direction based on a comparison result in the comparison unit.   The position shift detection device according to claim 1, wherein the determination unit also determines the presence or absence of an object other than the power feeding coil below the detection unit based on a comparison result in the comparison unit. .   The calculation unit for calculating the degree of displacement of the positional deviation based on the comparison result when the judgment unit determines that the positional deviation is present, further comprising: The position shift detection apparatus of any one of Claims. A power supply coil installed at least partially protruding from the ground in the parking area of the vehicle;
A receiving coil mounted on the vehicle and fed from the feeding coil in a non-contact manner;
The position shift detection apparatus according to any one of claims 1 to 4, wherein a position shift between the power feeding coil and the power receiving coil is detected.
A non-contact power feeding device comprising:

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