DE102014207412A1 - Method for identifying inductive charging areas for vehicles and inductive charging arrangement for a plurality of inductive charging areas - Google Patents

Abstract

A method for identifying inductive charging areas (20a-c) for vehicles (12) is described. The following steps are provided: detection of a charging request (L) of a vehicle by means of a stationary communication interface (30) and delivery of an identification alternating magnetic field (I) to a vehicle-side secondary coil (14). The identification alternating magnetic field is generated by means of a stationary charging device (40a-c). The identification alternating magnetic field is modulated here with an identification signal. Furthermore, an inductive charging arrangement (10) for a plurality of inductive charging areas (20a-20c) is described, which is suitable for carrying out the method.

Description

The invention relates to the field of electric and hybrid vehicles, in which a vehicle-side energy storage is also used to supply an electric drive. Since the use as a drive power source brings a high energy conversion, there are interfaces to such vehicles, can be transmitted via the electrical energy to the vehicle. In addition to wired devices (so-called plug-in vehicles) there are wireless devices in which the energy is transmitted inductively from a stationary charging coil to the vehicle-side coil. Well-known approaches are based on a clear assignment of a vehicle to a loading device, since in these approaches only a footprint for charging the vehicle is considered.

It is therefore an object of the invention to provide a way to handle multiple inductive loaders whose magnetic fields may overlap.

Disclosure of the invention

This object is achieved by the method and by the inductive charging device according to the independent claims. Preferred embodiments result with the features of the subclaims and with the features, properties and embodiments described below.

It is proposed to individualize the alternating fields emanating from stationary charging devices. Here, a modulation of the alternating magnetic field is used, which is emitted by the charging devices to distinguish by means of an identification signal, the individual alternating magnetic fields. This allows an assignment and possibly also a location of inductive charging areas. This makes it possible for a parking lot to hold several inductive charging areas for vehicles, for example a public parking space, without the parking spaces or the vehicles being incorrectly assigned.

A correct assignment is given in the usual refueling of fuel alone by the physical connection of refueling station and vehicle. In comparison, the magnetic fields of the energy sources used herein, i. H. Chargers, merge into each other, so that an approximate local assignment does not yet mean a correct assignment. Although it is assumed that an electric vehicle when driving the public parking lot is also wirelessly connected to the charging infrastructure with respect to data exchange, this data connection makes no clear assignment parking / vehicle ago, since the radio link is not directional works. Incorrect assignments lead, for example, to incorrect postings or incorrect status messages with regard to the state of charge of vehicles. Maybe there is no charging process.

Therefore, a method for the identification of inductive charging parking areas for vehicles is proposed. These inductive charging areas are in particular parking spaces within the same parking lot. First, a charging request of a vehicle is detected by means of a stationary communication interface. Here, the communication interface is part of a Induktivladeanordnung, which is stationary, and which holds and controls the inductive charging areas. On the vehicle side, the vehicle issues a charge request, which is then recorded stationary.

This charging request is in particular a radio signal and can be, for example, by means of a mobile radio protocol, by means of a wireless local network protocol (for example IEEE802.11 and comparable protocols) or by means of a protocol for data transmission over a short distance via radio technology. Alternatively, it is possible for the charging request to be received (stationary) and delivered (on the vehicle side) as an optical signal, for example an infrared signal or also a signal in the visible spectrum which can be emitted, for example, via the headlights of the vehicle. Furthermore, the charging request can also be an acoustic signal, which can be transmitted in particular via ultrasound, for example by means of ultrasonic distance sensors of vehicles.

Here, the transmission techniques for the transmission of the charging request have in common that they do not provide sufficient local resolution to accurately locate the vehicle relative to one of the shelves. For example, a GPS based location unit is not sufficiently reliable capable of locating the vehicles so accurately that a parking space can be assigned. Rather, common location functions are only able to locate the parking lot, but not in a clear way the parking space of the parking lot to be used for loading. In addition, even accurate satellite-based positioning systems in parking garages or underground garages offer little or no sufficient localization.

For this reason, the invention proposes to issue a location-specific response for identifying the loading areas by issuing an identification alternating magnetic field emanating from the relevant loading area.

Therefore, an identification alternating magnetic field is output to a vehicle-side secondary stage. The identification alternating magnetic field is generated by means of a stationary charging device. By generating the identification alternating magnetic field in the vicinity of the secondary coil, the secondary coil also detects (inter alia) a corresponding signal which corresponds to the identification alternating magnetic field at the secondary coil. The stationary charging device generates the identification alternating magnetic field by energizing the primary coil or by energizing another coil, which is stationary, but different from the primary coil. The other coil is in this case on the charging device, in particular on the primary coil and is thus assigned to this locally. The identification AC magnetic field may be further generated by coils of a coil-based (stationary) foreign-matter detection device, wherein the foreign-matter detection device is further capable of passively or actively detecting foreign matters by changes in a magnetic field.

Usually, the strength of the identification alternating magnetic field is chosen such that a range of at least 3 or 5 m, preferably 10 m, within which a vehicle-side secondary coil can detect the identification alternating magnetic field, d. H. can detect with a signal-to-noise ratio that is above a predetermined threshold. The identification AC magnetic field is not only for power transmission (which is the basis for charging batteries as well as the basis of general signal transmission), but also serves to transmit an identification signal. As a carrier for the identification signal is the identification alternating field. The identification signal identifies an inductive charging bay and allows multiple inductive charging bay areas to be distinguished from one another.

The identification alternating magnetic field is preferably modulated by the identification signal in which the current which serves to generate the identification alternating magnetic field is modulated with the identification signal and thus the charging device converts the thus modulated current into the modulated identification alternating magnetic field. In this case, an alternating current is preferably initially assumed, which is preferably not modulated and in particular has a specific frequency and / or lies in a specific frequency band, which is intended for inductive transmission of energy. In this case, preferably not the magnetic field itself is modulated, but the signal from which the alternating magnetic field is generated (by means of energization of a coil). Alternatively, operating parameters of the charging device can also be modulated, which have an influence on the generated magnetic field, such as power, inductance, turn-off characteristic and / or a magnetic resistance within the charging device. As already noted, preferably an electrical quantity is modulated, such as current, voltage or power, whereby possibly also a magnetic quantity such as the energy of the magnetic field, the field strength or the magnetic flux itself can be modulated.

In a simple case, the identification signal is used to jointly identify all or a subset of the inductive charging areas of the parking lot. Alternatively, the identification signals of different charging devices are different. Different charging devices belong to different inductive charging areas. In the case of a plurality of charging devices belonging to the same inductive charging bay, they can also have different identification signals, or else the same identification signal, which differs from the identification signal on the charging device of another inductive charging bay. Preferably, identification signals of all inductive charging locating surfaces which lie within a range of the identification alternating magnetic field. In particular, all inductive charging parking areas that are provided in the same parking lot can emit different identification signals (via the identification alternating magnetic field).

As an identification signal, which is used for the modulation of the identification alternating magnetic field, suitable signals that are expressed in different sizes, such as signals that are expressed in the frequency domain, which are in the frequency domain or in the time domain. The identification signal can be reproduced by means of the frequency, by means of a relative or absolute time variable and / or via an amplitude. The identification signal can be reproduced or coded via its frequency or over its course of the frequency. In this case, the spectrum, in particular the frequency or even the temporal course of the frequency or of the spectrum is the quantity with which the identification signal acts on the identification alternating magnetic field via the modulation.

Furthermore, the identification signal can be encoded over the time of occurrence (or another absolute time variable, over the duration or over a duty cycle of the signal.) An absolute time variable is considered to be a time variable having a temporal reference point, for example a fixed time or also Here, the time of occurrence, the duration or the duty cycle of the identification signal reproduces identification data, the same applies to the above-mentioned variables Frequency, Frequency response or spectrum of the identification signal, which reproduce identification information or data. Finally, it is possible for the identification signal to be coded via its amplitude, in particular at the location of the primary coil or the stationary charging device. Alternatively, the identification signal can be coded via its amplitude profile. The amplitude or the amplitude curve carries the identification information.

The type of modulation with which the identification alternating magnetic field is modulated may be an amplitude, frequency, pulse and / or phase modulated modulation. As already noted, there is not necessarily a distinction here between a modulation of the magnetic field itself and a modulation of a (current) signal which is used to generate the alternating magnetic field. In physical terms, therefore, the modulation may be amplitude, frequency, pulse or phase modulation, which modulation may also include security aspects such as redundant coding of identification data and the like.

The identification data serve to individualize respective loading areas within a subset of inductive charging areas, within all inductive charging areas of a parking lot, within all inductive charging areas operated by a particular provider, or within all inductive charging areas of an area or country.

In a preferred embodiment, the identification signal is a pulse modulation signal. In this case, the identification alternating magnetic field is switched on or off according to pulses, but more than two different (discrete) power stages can be used to modulate the magnetic field. In this case, the identification signal occurs at different times or time intervals of a time grid. In other words, the identification signal changes at different times, the respective time points or time intervals representing the identification information contained in the identification signal. The identification signal may be an on or off pulse according to which the identification alternating magnetic field is on or off. A time grid can be provided, for example with branched division in milliseconds, hundredths of a second, tenth of a second or individual seconds, different identification signals or different identification alternating magnetic fields having different states (on or off) at different time intervals of this grid. In this way, the identification alternating magnetic field can be modulated very easily. Instead, or in combination with it, a duty cycle may be used to render the identification information. Here, the identification signal is a rectangular signal with different lengths on or off durations, wherein in addition to the duty cycle and the pulse duration for different identification alternating magnetic fields may be different. The identification signal is reproduced by the state history (on or off) or by switching times and possibly by switching directions (turn on or off).

The identification signal can thus also be coded on the basis of on-durations and off-durations so as to influence the amplitude or the power or the state (on or off) of the identification alternating magnetic field in a modulating manner.

The identification information which reproduces the identification signal and thus also the alternating magnetic field can be, for example, a shelf number which individualizes the shelf of a group of shelves (for example all shelves of the parking space). Alternatively, the identification information representing the identification signal may have a random value, so that the use of random values alone can distinguish the loading areas (since with sufficiently large values it is substantially unlikely that two shelves have the same value).

The identification information may be reproduced in any form of character encoding, for example in the form of ASCII code, according to an ISO character set, such as the ISO8859 , or according to a BCD code, such as the EBCDIC code.

The identification information, which is modulated by means of the identification signal in the identification alternating magnetic field, in addition to an identification of the parking space (be it by random numbers or by means of fixed characters, the respective parking spaces are permanently assigned), the identification information also relative or absolute location data reflect the location the respective inductive charging area or the relative position of the vehicle to the inductive charging parking area. Further, further information may be included in the identification information such as charge information, tariff information, operator information or even a map by the inductive charging parking areas of the parking lot are identified, preferably in combination with the current position of the vehicle. In addition, a booking confirmation for the vehicle may be present if the vehicle was booked on a specific pitch and this is now to control.

A particularly preferred embodiment provides that the information within the Identification signal reflects information that has been sent from the vehicle. For example, the vehicle may emit a pulse that is repeated in the form of a pulse (which represents the identification signal) from a stationary charging device. Thus, the signal emitted by the vehicle, ie the pulse, reappears in an identification alternating magnetic field, namely in that which characterizes the associated inductive charging area. Here, the identification signal is encoded on the exit time, wherein the exit time of the identification signal or a pulse within the identification alternating magnetic field, taking into account tolerances corresponds to the time at which the vehicle has issued such a pulse. Since only one of the inductive charging pads (namely a free one) outputs an identification alternating magnetic field reflecting the pulse of the vehicle, the vehicle can be assigned to exactly one inductive charging bay. Alternatively, a subset of the inductive charging areas repeat the pulse, so that the vehicle is free to drive one of these shelves.

The pulse emitted by the vehicle can be emitted by the secondary coil of the vehicle, but also by a communication interface such as a mobile radio module, a WLAN module or a Bluetooth module (or even a DECT module). The above-mentioned pulse, which emits the vehicle, corresponds for example to the charging request or is part of the charging request. Thus, at the time of occurrence, a charging request from one or a subset of the identification alternating magnetic fields, a pulse or another signal are emitted, so that takes place due to the temporal correlation, the assignment of vehicle and footprint. As a temporal correlation, a simultaneous occurrence is understood as well as a time-delayed occurrence, the time offset is known or predetermined and in particular fixed.

Furthermore, the vehicle can transmit the charging request to the stationary communication interface. Loading requests of different vehicles differ (for example in their content or by different appearance times) and can in particular identify the vehicle or the driver of the vehicle. The identification signal may comprise at least a portion of the load request other than other load requests, in identical or modified form. Thus, the signal representing the load request (or only a portion thereof) may be reproduced with the same amplitudes and / or frequency response within the identification signal. Alternatively, the load request may be modified, substantially to any form that allows for modification of the signals or data in question. As an identical form, it is also possible to consider forms of signals which use different physical quantities as carriers, for example different frequency ranges or different types of wireless transmission (for example inductive or radio). As a modified form, in particular, a transformation of the character or of the signal which is emitted by the vehicle and is repeated in such modified form by the identification signal can be considered.

At least one of the inductive charging areas is identified by means of the modulated identification alternating magnetic field, so that an assignment is possible. Alternatively or in combination herewith, by means of the identification alternating magnetic field, an inductive charging area can be located, for example by triangulation and / or by determining the magnetic field direction at the location of the vehicle and / or by comparing field strengths at several locations of the vehicle.

The identification alternating magnetic field can be generated with a stationary primary coil. In this case, this primary coil also serves to generate a charging alternating magnetic field. The charging AC magnetic field has a higher field strength than the identification AC magnetic field. The charging AC magnetic field can be designed to transmit power of 1 kW, 2 kW, 3 kW or more. The identification alternating magnetic field may be designed to realize a range of at least 5, 10, 15 or 20 m) and in particular may have a power that is less than 100 W, 50 W, 10 W or 5 W. The power of the charging AC magnetic field may be greater than the power of the identification AC magnetic field by a factor of 5, 10, 20 or preferably also 50 or 100. In many embodiments, since the charging AC magnetic field scatters less than the identification AC magnetic field, the higher power does not necessarily result in disturbance of the identification AC magnetic field.

Alternatively, the identification alternating magnetic field may be generated with a stationary signaling coil different from the primary coil. Both signaling coil and primary coil may be part of the charging device (an inductive charging interface). The primary coil and the signaling coil are in this case preferably arranged one above the other or next to each other, but not more spaced than the minimum distance between two charging devices of different loading areas. As described above, a preferably coil-based foreign object detection device can also be provided, the coils of which are used for detecting the magnetic field and thus be used by foreign bodies and on the other to generate the identification alternating magnetic field. In this case, the coils of the foreign body detection device have the purpose of stationary signaling coils and, like them, are not identical to the primary coil.

From the charging device, a status signal can be detected, such as an inductance of the primary coil of the charging device (or an inductance of the signaling coil or the coils of the foreign-matter detection device). The status signal may further be a level, a current or a voltage of a coil of the stationary charging device. The status signal again indicates whether or not a vehicle is also located above the relevant charging device or over the relevant primary coil. Alternatively or additionally, the status signal can reproduce whether the charging device is ready or if there is a fault, for example in the form of foreign objects. The identification alternating magnetic field is emitted only when the status signal reproduces a free charging device. In this case, the charging device is assigned to the inductive charging area, which is free. The identification alternating magnetic field can be released, in particular, when a ready charging device (and preferably also a free inductive charging contact area) is reproduced as the status signal.

Finally, an inductive charging arrangement is described which is provided for a plurality of inductive charging areas. The inductive charging arrangement comprises (at least) one stationary communication interface. This may be implemented like the communication interface described above, and thus based on a mobile radio protocol, on a wireless local network protocol, on a wireless local area network protocol or on other wireless radio protocols. In particular, the communication interface can also be set up to transmit information via one of the alternating magnetic fields described here.

The inductive charging arrangement further comprises a plurality of stationary charging devices. These are assigned to different inductive charging areas. The charging devices comprise at least one primary coil and may further comprise a signaling coil and / or coils of a foreign-body detection device.

The inductive charging device further comprises a control unit. This is connected to the communication interface to receive data from. Further, the control unit is drivingly connected to the charging devices, in particular with a plurality of charging devices or with all the charging devices of the present inductive charging areas (a parking lot). The control unit comprises an identification signal generator. This is set up to control the various charging devices with different identification signals. Here, the control unit is configured to generate a current with which the identification alternating magnetic field is generated, and which is modulated in accordance with the identification signal, preferably within the control unit. As a result, an identification alternating magnetic field, which is modulated with an identification signal, results from conversion at the charging device from the current.

In a simple case, the identification signal generator may generate a pulse in response to a load request received from the communication interface. This pulse is used to drive one or more charging devices (in particular all free devices) so that they emit an identification alternating magnetic field containing the pulse. The pulse may be a square pulse in a very simple embodiment, but may also carry (besides the exit time) further information such as an identification of the vehicle, the driver, the inductive charging area. In the case of complex pulses, these can also be used for data transmission of files, for example a file which reproduces a map of the inductive charging areas, or which reproduces a tariff, a booking confirmation or the like. In this case, the pulse may be a burst whose exit time alone already identifies the assigned inductive charging area, but which may also carry further information, in particular useful information, as described above. The user information is not only limited to data, but may also include programs executable on a device of the vehicle, or may include graphical information, or may also capture a text or hypertext document that may be displayed in the vehicle.

The signal generator is designed according to the complexity of the identification signal and can thus be realized with a bandwidth of components, ranging from a simple flip-flop, a microprocessor to a computer, which also prepares user data for transmission by identification signal.

The vehicles used herein for description are, in particular, motor vehicles having an electric drive alone or in combination with other drive types, such as electric vehicles or hybrid vehicles. Here, electric vehicles or hybrid vehicles include motor vehicles or electrically powered bicycles.

Brief description of the figures

The 1 shows a course diagram for explaining an embodiment of the method and

The 2 shows schematically an exemplary construction for an inductive charging arrangement.

In the 1 is first, in particular triggered by the approaching vehicle over the period 1 An alternating magnetic field is emitted (continuous or repetitive) so as to communicate with the vehicle that Inductive charging areas are in the vicinity. Since a magnetic alternating field is preferably emitted continuously or intermittently, a plurality of arrows is shown which indicate the communication between the stationary components (in particular the inductive charging arrangement) 10 ) and the mobile components (in particular vehicle 12 ) play. That in the time interval 1 emitted alternating magnetic field serves to make the vehicle aware of the charging option, but is optional, so that alternatively only an alternating magnetic field, in particular an identification alternating magnetic field can be issued if a charge request L already exists.

At the time 2 the vehicle detects that a loading area is nearby or sends a charge request L on its own at the time 3 received from stationary side. The following is the delivery of an identification alternating magnetic field I, which contains the identification signal, this alternating magnetic field from the mobile side at the time 4 is detected. The vehicle then moves 4 to the inductive charging area identified by means of the identification signal. Alternatively, the identification signal can also be transmitted only when the vehicle has reached the final position above the loading device.

At the time 5 the vehicle is located on the corresponding inductive charging area and a charging process begins. The transmission of power is through the line between times 5 and 6 specified. Point of time 6 thus corresponds to the start of loading from the mobile side, wherein optionally during loading, data can be transmitted from the stationary side to the mobile side, as with the dashed arrow between the reference numbers 5 and 6 is shown. This data may be, for example, the currently delivered power or a signal representing an active state of charge. Similarly, during charging, it is possible to repeatedly communicate from the mobile side to the stationary side that the charging process is error-free or it can be specified which power is requested from the mobile side. Furthermore, further operating data may also be indicated, for example the temperature of a charge control within the vehicle or the temperature of the battery, in particular also the state of charge.

Furthermore, other user data may be transmitted between the stationary side and the mobile side, for example the current charges, the state of charge of the battery, the volume of energy still to be transferred or also a schedule which controls the future charging process, for example if the charging process is later than the arrival starts at the loading area.

At the time 7 the loading is finished, whereby here from mobile side at stationary side a suitable message is sent, so that at the time 8th the transfer of power ends. At the time 7 may be further transferred that the vehicle leaves the loading area or is left at a certain time, so that at the time 8th a message N can be transmitted to other vehicles that the inductive charging area is free. These messages can also be transmitted to a database within the inductive charging arrangement or outside of the inductive charging arrangement in which currently free loading locations can be stored or retrieved from the vehicle.

This in 1 Flowchart shown is not to scale. The 1 does not primarily represent a course over time, but serves above all the representation of events and their reaction. Therefore, the angle of the arrows shown as well as the intervals between the times is not a representation of the time sequence, but only serves to illustrate an event sequence that should bring the process mechanism of the process closer.

The 2 shows next to an inductive charging device 10 a vehicle 12 which is a secondary coil 14 having. About this can the vehicle 12 getting charged. There are several inductive charging areas 20a - 20c shown, its stationary charging device 40a C are part of the inductive charging arrangement. The inductive charging areas 20a - 20c are merely shown in order to explain the spatial arrangement of the charging devices closer. The inductive charging arrangement further comprises a stationary communication interface 30 , This is with a control unit 50 connected to the inductive charging device. This gives the control unit 50 a charging request L from the vehicle 12 , which for this purpose has a not shown, corresponding communication device.

The control unit 50 further comprises an identification signal generator 60 that the different charging devices 40a -C with signal drives, comprise the different identification signals. According to one embodiment, the loading device receive 40a -C the identification signals, in which case the identification signal generator 60 directly with the charging devices 40a -C is connected. This includes the charging devices 40a C each have a power output stage, which generate a current with which the identification alternating magnetic field is generated in accordance with the identification signal. These include the charging devices 40a -C primary coils, but also other coils, such as signaling coils (shown in dashed lines, by way of example reference numerals 44a ) are contemplated to generate the identification alternating magnetic field. In the basis of 2 the illustrated case becomes the mean inductive loading area 20b and in particular their charging device 40b selected so that it generates an identification alternating magnetic field. This is from the vehicle 12 received, wherein the corresponding signal transmission by the arrow between the inductive charging area 20b and the vehicle 12 is shown.

Here, the identification signal (with the identification alternating magnetic field as a carrier signal) from the secondary coil 14 of the vehicle 12 receive.

In an alternative embodiment, the control unit comprises 50 a power output unit 70 in which the already modulated current is generated and to the charging device 40a -C is delivered individually. Here is the power output unit 70 the identification signal generator 60 upstream of the corresponding identification signal for modulation to the power output unit 70 emits.

LIST OF REFERENCE NUMBERS

1

Time interval in which an alternating magnetic field is emitted (for signaling inductive charging areas to the vehicle)

2

Reception of an alternating magnetic field, which indicates the presence of inductive charging areas, or time at which a charging request L is sent

3

Time at which the charge request L is received and at which the identification alternating magnetic field I is delivered

4

Time at which the identification AC magnetic field I is received on the mobile side

5

Time at which the vehicle arrives at the identified inductive charging area and charging start

6

Time, or time interval during loading or loading starts

7

End of loading or time at which the vehicle leaves the inductive loading area

8th

Time at which is detected from the stationary side that the inductive charging area is set free or time at which a message N is issued, which reflects a free inductive charging area

L

charging request

I

Identification alternating magnetic field

N

Message about free space instead of stationary side

mob

 mobile page

Stat

 stationary side

t

Flow direction or time

10

Induktivladeanordnung

12

vehicle

14

secondary coil

20a-c

Induktivladestellfläche

30

Communication Interface

40a-c

loaders

42a-c

Primary coils of the charging devices

50

control unit

60

Identification signal generator

70

optional power output unit

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited non-patent literature

• IEEE802.11 [0007]
• ISO8859 [0021]

Claims (10)

Method for identifying inductive charging areas ( 20a -C) for vehicles ( 12 ), comprising the steps of: detecting a charging request (L) of a vehicle by means of a stationary communication interface ( 30 ); and outputting an identification alternating magnetic field (I) to a vehicle-side secondary coil ( 14 ), wherein the identification alternating magnetic field by means of a stationary charging device ( 40a -C) is generated; wherein the identification alternating magnetic field is modulated with an identification signal. Method according to claim 1, wherein the identification signals of different charging devices ( 40a ; 40b ; 40c ), the different inductive charging areas ( 20a ; 20b ; 20c ) are different.  The method of claim 1 or 2, wherein the identification signal on the frequency or the frequency response of the signal, the time of occurrence, the duration or a duty cycle of the signal, the amplitude of the signal at the location of the primary coil, or the amplitude characteristic of the signal is encoded.  Method according to one of the preceding claims, wherein the identification alternating magnetic field with the identification signal amplitude, frequency, pulse and / or phase-modulated. Method according to one of the preceding claims, wherein the identification signal occurs at different times or time intervals of a time grid, wherein different time points or time intervals of the time grid different inductive charging areas ( 20a ; 20b ; 20c ) assigned. Method according to one of the preceding claims, wherein the vehicle ( 12 ) the loading request to the stationary communication interface ( 30 ) and charging requests (L) of different vehicles ( 12 ) and in particular the vehicle ( 12 ) or the driver of the vehicle, further comprising the identification signal with which the identification alternating magnetic field (I) is modulated, at least a portion of the charging request (L), which differs from other charging requests, in identical or modified form. Method according to one of the preceding claims, wherein at least one of the inductive charging areas ( 20a C) is identified and / or located by means of the modulated identification alternating magnetic field (I). Method according to one of the preceding claims, wherein the identification alternating magnetic field (I) with a stationary primary coil ( 42a -C), which also serves to generate a charging alternating magnetic field, or wherein the identification alternating magnetic field with a stationary signaling coil ( 44a ) is generated while a charging AC magnetic field is generated with a primary coil different therefrom. Method according to one of the preceding claims, wherein a status signal of the charging device ( 40a -C), such as an inductance of the primary coil ( 42a C) the charging device, wherein the identification alternating magnetic field (I) is emitted only when the status signal is a free, the loader associated inductive charging area ( 20a -C). Inductive charging device ( 10 ) for several inductive charging areas ( 20a - 20c ) with a stationary communication interface ( 30 ), several stationary charging devices ( 40a -C), the different inductive charging areas ( 20a - 20c ) and a control unit ( 50 ) connected to the communication interface ( 30 ) as well as with the charging devices ( 40a C), the control unit ( 50 ) an identification signal generator ( 60 ), which covers the various charging devices ( 40a -C) with signals that comprise different identification signals.

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