JP6943185B2 - Vehicle information detector - Google Patents

Description

The present invention relates to the technical field of a vehicle information detection device that detects information about a vehicle.

A technique for non-contact power supply to a vehicle using a coil laid along a track is known. In such a technology, the position (specifically, the relative position between the laid power transmission coil and the power receiving coil provided in the vehicle) and speed of the vehicle are detected in order to supply power at an appropriate timing. Is required to do. For example, Patent Document 1 discloses a technique of detecting the amount of strike-slip from the track of a vehicle based on the magnetic field strength generated between the coil and the vehicle. Patent Document 2 discloses a technique for measuring the speed of a vehicle by using two magnetic sensors that detect the strength of magnetic fields in the X-axis direction and the Y-axis direction.

JP 2015-224007 Japanese Unexamined Patent Publication No. 2009-053056

The techniques described in Patent Documents 1 and 2 described above have room for improvement in improving the detection accuracy of the position and speed of the vehicle.

The present invention has been made in view of the above problems, for example, and an object of the present invention is to provide a vehicle information detection device capable of accurately detecting the position and speed of a vehicle.

In one aspect of the vehicle information detection device according to the present invention, a plurality of detection coils laid on the road on which the vehicle travels, an acquisition means for acquiring information on the voltages of the plurality of detection coils, and the plurality of detection coils. The plurality of detection coils include an estimation means for estimating at least one of the position and speed of the vehicle based on information about the voltage, and the plurality of detection coils are used as the vehicle passes over the plurality of detection coils. The coils provided in the vehicle and two or more of the plurality of detection coils are arranged side by side in a direction intersecting the traveling direction of the vehicle, and the estimation unit is provided in the vehicle. At least one of the position and speed of the vehicle is estimated by determining which of the plurality of detection coils overlaps with the obtained coil.

It is the schematic which shows the structure of the non-contact power supply system. It is a top view which shows the structure of the plurality of detection coils which concerns on 1st Embodiment. It is a top view which shows the structure of the power receiving coil mounted on a vehicle. It is a block diagram which shows the structure of the detection coil and the position / speed detection part which concerns on 1st Embodiment. It is a top view which shows the overlap of a plurality of detection coils and a power receiving coil which concerns on 1st Embodiment. It is a time chart which shows the change of the voltage detected in the plurality of detection coils which concerns on 1st Embodiment. It is a three-dimensional graph which shows an example of the distribution of the coupling coefficient. It is a top view which shows the overlap of a plurality of detection coils and a power receiving coil which concerns on 2nd Embodiment.

Hereinafter, embodiments of the vehicle information detection device will be described with reference to the drawings.

<Non-contact power supply system>
First, the configuration of the non-contact power supply system that supplies electric power to the vehicle and the problems that may occur in the non-contact power supply system will be described with reference to FIG. FIG. 1 is a schematic view showing the configuration of a non-contact power feeding system.

As shown in FIG. 1, the contactless power supply system, a power receiving coil C _R of a vehicle 10, power between a plurality of power transmission coils C _T laid in the road it is exchanged. Specifically, in accordance with the passage of the vehicle 10 moving at high speed, the power transmission coil C _T, that the power is the power transmission with respect to the power receiving coil C _R, power supply to the vehicle 10 can be realized.

In such a non-contact power feeding system, it is preferable that the position and speed of the vehicle can be accurately detected in order to perform efficient power feeding. However, the vehicle 10 will always do not necessarily pass through the same position to the power transmission coil C _T, varies depending on the speed driver operation. Therefore, it is not easy to accurately detect the position and speed of the vehicle.

The vehicle information detection device according to the present embodiment is configured to be able to detect the position and speed of the vehicle by using a plurality of detection coils in order to solve the above-mentioned problems.

<First Embodiment>
The vehicle information detection device according to the first embodiment will be described with reference to FIGS. 1 to 7.

<Coil layout>
First, the coil arrangement configuration in the vehicle information detection device according to the first embodiment will be described with reference to FIGS. 2 and 3. FIG. 2 is a plan view showing the configuration of a plurality of detection coils according to the first embodiment. FIG. 3 is a plan view showing the configuration of a power receiving coil mounted on a vehicle.

As shown in FIG. 2, the vehicle information detecting apparatus according to the first embodiment, the plurality of power transmission coils _{C T (L (m) ×} L (m)) Separately, a plurality of detection coils C _S configuration Has been done. Detection coil _{C S} is disposed in M (m) away from the power transmission coil _{C T.} The detection coil C _S is (in other words, the vehicle width direction) direction intersecting the traveling direction of the vehicle 10 is arranged so as to line up in.

The plurality of detection coils _CS are configured so that their lengths (that is, the sizes along the traveling direction of the vehicle 10) are different from each other. _{Specifically, assuming that} the lengths of the longest detection coils _CS2 , _CS8 , and CS13 are O (m), the second longest detection coils _CS2 , _CS4 , _CS7 , _CS9 , _CS12 , And _{the length of CS14} is O / 2 (m), and the length of the shortest detection coils _CS1 , _CS5 , _CS6 , _CS10 , _CS11 , and _CS15 is O / 4 (m). It is configured. The width of the plurality of detection coils C _S (i.e., the size along the vehicle width direction) is respectively N (m).

As shown in FIG. 3, the power receiving coil C _R provided in a vehicle 10 has a width of A (m), is configured such that B (m) in length. Width A of the power receiving coil C _R is set to be larger than the width N of the detection coil C _S. Therefore, the vehicle 10, as it passes over the detection coil _{C S} is the receiving coil _{C R} is the overlap with the plurality of detection coils _{C S} (for example, overlaps the _{C S14} from _{C S9} in FIG. 2 There is). Between the length B of the power receiving coil C _R and the length O of the detection coil C _S, the relationship B <O / 4 is set to satisfy.

<Structure of position / speed detector>
Next, the configuration of the position-speed detector for detecting the position and speed of the vehicle 10 using the detection coil C _S described above will be described with reference to FIG. FIG. 4 is a block diagram showing a configuration of a detection coil and a position / speed detection unit according to the first embodiment.

As shown in FIG. 4, the detection coil _CS is connected to the AC power supply 50. Further, a detection _{resistor RS} is provided _{between the detection coil CS} and the AC power supply 50. Voltage V _S applied to the sensing resistor R _S is used for the operation for detecting the position and speed of the vehicle 10 by the position and speed detection section 100.

The position / speed detection unit 100 includes an acquisition unit 110 and an estimation unit 120 as processing blocks that realize the function.

Acquiring unit 110 is one specific example of the "acquisition means" in the attached claims will be described later, to obtain the value of the voltage V _S applied to the sensing resistor R _S. Information about the voltage V _S that has been acquired by the acquiring unit 110 is configured to output the estimation unit 120.

Estimator 120 is one specific example of the "estimating device" of the note that will be described later, based on the information on the voltage V _S that has been acquired by the acquisition unit 110 estimates the position and velocity of the vehicle 10. It was estimated in the estimation unit 120 position information (i.e., position information indicating the vehicle 10) and speed information (i.e., information indicating the speed of the vehicle 10), the power transmission coil C _T and the power receiving coil C _R in the non-contact power supply system It is used for power transfer between. Specifically, for example, it used to determine the driving timing and the driving frequency of the power transmission coil C _T.

<Position / speed detection operation>
Next, the position / speed detection operation (that is, the operation of detecting the position and speed of the vehicle 10) by the vehicle information detection device according to the first embodiment will be described with reference to FIG. FIG. 5 is a plan view showing the overlap of the plurality of detection coils and the power receiving coil according to the first embodiment.

As shown in FIG. 5, it is assumed that the vehicle 10 is traveling at a speed V toward the position _{where the detection coil CS is laid.} In this case, when the vehicle 10 reaches the laying position of the detection coil C _S, expanded area of the receiving coil C _R and a detection coil C _S overlap each other, as a result, the voltage V _S at each detection coil C _S descend. At this time, the power receiving coil C _R, since that would overlap earlier long detection coil C _S, the more is the longer detection coil C _S, the voltage V _S drops at a faster timing.

Hereinafter, the variation of _{V S7} from the voltage _{V S3} of _{C S7} from a plurality of detection coils _{C S3} overlapping the receiving coil _{C R,} specifically described with reference to FIG. FIG. 6 is a time chart showing changes in voltage detected in the plurality of detection coils according to the first embodiment.

As shown in FIG. 6, when the vehicle 10 approaches the detection coil C _S, be the first longest detection coil C _{S3 (the} length O (m)) and the power receiving the coil and C _R overlap. Therefore, first voltage _{V S3} of the detection coil _{C S3} is reduced. Then, so that the long detection coil _{C S4} in the second and _{C S7} (length O / 2 (m)) and the power receiving coil _{C R} overlap. Therefore, the voltage _{V S4} and _{V S7} detection coil _{C S4} and _{C S7} decreases. Finally, the shortest detection coil _{C S6} and _{C S6} (length O / 4 (m)) and the power receiving the coil and _{C R} overlap. Therefore, the voltage _{V S5} and _{V S6} detection coil _{C S5} and _{C S6} is lowered.

Among the plurality of detection coils C _S overlapping the receiving coil C _R, for the detection coil C _S3 and C _S7 located at both ends, a region overlapping with the power receiving coil C _R is only partially. That is, for the detection coil _{C S3} and _{C S7} located at both ends, compared with _{C S6} from the sensor coil _{C S4} located other than at both ends, a small area overlapping with the power receiving coil _{C R.} Therefore, the voltage _{V S4} and _{V S7} detection coil _{C S3} and _{C S7} located at both ends, compared from the detection coil _{C S4} located other than at both ends with _{V S6} from the voltage _{V S4} of _{C S6,} reduced width is reduced .. Specifically, _{V S6} from the voltage _{V S4} of _{C S6} from the sensor coil _{C S4} located other than both ends, both of which decrease _{V C.} On the other hand, voltage _{V S4} and _{V S7} detection coil _{C S3} and _{C S7} located at both ends are only reduced _{V A} or _{V B,} respectively. Incidentally, _{V A} and _{V B} varies depending on the size of the region where the detection coil _{C S} and the power receiving coil _{C R} overlap.

With the V _S that varies mentioned above, it is possible to estimate the position and speed of the vehicle 10. Specifically, the vehicle speed V can be calculated by using the following mathematical formula (1).
V = 1000 × O / 2t _{O / 2} ... (1)
_{Incidentally, t O / 2} is a vehicle O / 2 (m) proceeds takes time to _(i.e., the difference between the timing at _{which V S3} is _reduced, the timing _{of V S4} and _{V S7} is lowered).

Position of the vehicle a (i.e., the distance from the end portion of the plurality of detection coils C _S to the end of the vehicle 10, see FIG. 2), of the detection coil C _S overlapping the receiving coil C _R provided in the vehicle 10 , can be calculated from the ratio of the _{V S6} from the sensor coil _{C S3} and the voltage drop width _{V a} and _{V B} of _{C S7,} the voltage drop width _{V S4} of _{C S6} from the sensor coil _{C S4} located other than both ends at both ends .. Specifically, the position a of the vehicle can be calculated by using the following mathematical formula (2).
a = x × N + (1- _VA / V _B ) × N ・ ・ ・ (2)
Incidentally, x is, there is no voltage drop of the plurality of position detecting coils C _S (in other words, non-overlapping with the power receiving coil C _R) is a number indicating the number of coils. For example, in the example of FIG. 5, x = 2.

<Operation of power transmission coil>
Next, the operation of the power transmission coil C _T after the detection of the position and speed of the vehicle as described above will be described with reference to FIG. FIG. 7 is a three-dimensional graph showing an example of the distribution of coupling coefficients.

From the vehicle 10 passes through the detection coil C _S (more specifically, from beyond the receiving coil C _R is the end of the detection coil C _S), the time TM to reach the power transmission coil C _T, the following It can be calculated using the formula (3).
_TM = M / V ・ ・ ・ (3)

Therefore, if the drive start power transmission coil C _T after T _M from the vehicle 10 passes the detection coil C _S, it can be carried out suitably powered. However, as shown in FIG. 2, a plurality of power transmission coils C _T is the case in a row along the traveling direction of the vehicle 10 calculates the T _M taking into account the position of the respective power transmission coils C _T. Incidentally, T _M, to the value calculated by the above equation (3) may be a value obtained by adding the delay time d of the power transmission coil C _T.

The driving frequency f _S of the power transmission coil C _T can be calculated using the coupling coefficient k which has been determined according to the positional relationship of the pre-transmission coil C _T and the receiving coil C _R. Specifically, the drive frequency _{f S is, f S = 1 / (2π} {(1-k 2) L 2 C 2} -2) can be calculated using the following formula (4) + _{f a} ·・ ・ (4)
Incidentally, f _a is a predetermined adjustment value.

As shown in FIG. 7, the coupling coefficient k varies depending on the distance between the centers of the power transmission coil C _T and the receiving coil C _R. Therefore, as described above, by driving the transmitting coil C _T at the driving frequency f _S which changes according to the coupling coefficient k, it is possible to effectively improve the power transmission efficiency.

<Technical effect>
Next, the technical effect obtained by the vehicle information detection device according to the first embodiment will be described.

From Figure 2, as described with reference to FIG. 7, according to the vehicle information detecting apparatus according to the first embodiment, by using a plurality of detection coils C _S, accurately detect the position and speed of the vehicle 10 can do. By using the information regarding the position and speed of the vehicle 10 detected in this way, it is possible to efficiently execute the non-contact power supply to the vehicle 10.

<Second Embodiment>
Next, the vehicle information detection device according to the second embodiment will be described with reference to FIG. FIG. 8 is a plan view showing the overlap of the plurality of detection coils and the power receiving coil according to the second embodiment.

It should be noted that the second embodiment is different from the above-described first embodiment only in a part of the configuration, and the other parts are substantially the same. Therefore, in the following, the parts different from the first embodiment will be described in detail, and the overlapping parts will be omitted as appropriate.

As shown in FIG. 8, the detection coil C _S according to the second embodiment is constructed as a coil of one another the same length. In such a structure, the difference in drop timing of the voltage V _S of each detection coil C _S as in the first embodiment does not occur. That is, the voltage V _S of the plurality of detection coils C _S according to the second embodiment is reduced approximately at the same timing.

However, even in the detection coil C _S according to the second embodiment, it is possible to detect the detection coil C _S of the voltage V _S decreases, detects whether the vehicle 10 is traveling any position. Therefore, the position of the vehicle can be detected with high accuracy. Further, if the accurate position information detected in this way is used, the accuracy in estimating the speed of the vehicle is also improved.

<Additional notes>
Various aspects of the invention derived from the embodiments described above will be described below.

(Appendix 1)
The vehicle information detection device according to Appendix 1 relates to a plurality of detection coils laid on the road on which the vehicle travels, acquisition means for acquiring information on the voltages of the plurality of detection coils, and voltages of the plurality of detection coils. An estimation means for estimating at least one of the position and speed of the vehicle based on the information is provided, and the plurality of detection coils are provided in the vehicle when the vehicle passes over the plurality of detection coils. The coils are arranged side by side in a direction intersecting the traveling direction of the vehicle so that two or more of the plurality of detection coils overlap each other, and the estimation unit is provided on the vehicle. At least one of the position and speed of the vehicle is estimated by determining which of the coils and the plurality of detection coils overlap.

According to the vehicle information detection device described in Appendix 1, the position and speed of the vehicle are determined by determining which of the coils provided in the vehicle and the plurality of detection coils laid on the road overlap. At least one of them is estimated. Therefore, the estimation accuracy (in other words, the detection accuracy) can be improved as compared with the case where the position and speed of the vehicle are estimated using, for example, a single coil.

In this embodiment, in particular, the plurality of detection coils are such that when the vehicle passes over the plurality of detection coils, the coils provided in the vehicle and two or more of the plurality of detection coils overlap each other. They are arranged side by side in a direction that intersects the traveling direction (in other words, in the vehicle width direction). By arranging the plurality of detection coils in this way, as described above, the position and speed of the vehicle can be suitably detected according to the overlap between the coils provided in the vehicle and the detection coils.

The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope of claims and within a range not contrary to the gist or idea of the invention that can be read from the entire specification, and a vehicle information detection device accompanied by such a modification. Is also included in the technical scope of the present invention.

10 vehicle 50 AC power supply 100 position and speed detection unit 110 acquiring unit 120 estimating unit C _R receiving coil C _T transmitting coil C _S detection coil R _S detection resistor

Claims (2)

Multiple detection coils laid on the road on which the vehicle travels,
An acquisition means for acquiring information on the voltages of the plurality of detection coils, and
It is provided with an estimation means for estimating at least one of the position and speed of the vehicle based on the information on the voltages of the plurality of detection coils.
The plurality of detection coils are such that when the vehicle passes over the plurality of detection coils, the coils provided in the vehicle and two or more of the plurality of detection coils overlap each other. They are arranged side by side in the direction of intersection with the direction of travel of
The estimation unit is characterized in that at least one of the position and speed of the vehicle is estimated by determining which coil of the plurality of detection coils overlaps with the coil provided in the vehicle. Vehicle information detection device. In the estimation unit, the coil provided in the vehicle and any of the plurality of detection coils overlap each other based on the voltage that is lowered by overlapping the coil provided in the vehicle and the detection coil. The vehicle information detection device according to claim 1, further comprising determining whether or not the coil information is used.

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