Inductive charging means for a vehicle charging system and device for determining information about a tolerance zone for positioning an inductive charging means
Patent Information
- Application Number
- PCT/EP2026/053869
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-02-18
- Filing Date
- 2026-02-12
- Publication Date
- 2026-08-27
Smart Images
Figure EP2026053869_27082026_PF_FP_ABST
Abstract
Description
[0001] February 12, 2026
[0002] 1
[0003] Inductive charging device for a vehicle charging system and device for determining information about a tolerance zone for the positioning of an inductive charging device
[0004] The invention relates to an inductive charging device for a vehicle charging system, a device for determining information about a tolerance zone for the positioning of an inductive charging device of one vehicle relative to another inductive charging device, a corresponding method and system, and a vehicle with an inductive charging device.
[0005] An inductive charging device for a vehicle to receive energy via a stationary inductive charging device is described in the standard SAE J2954 from August 2024.
[0006] To ensure efficient energy transfer, the vehicle's mobile inductive charging device should be positioned as optimally as possible relative to the stationary inductive charging device.
[0007] The standardized positioning system proposed in the aforementioned standard (Chapter 12; Annexes C and D) is the so-called differential inductive positioning system (DIPS). This system features a positioning device on the transmitter side, which is located in a stationary inductive charging unit (also referred to as a ground assembly or GA), preferably located in or on the ground. According to the standard, this transmitter-side positioning device has five transmitting coils, each generating a positioning magnetic field (hereinafter also referred to more generally as positioning fields) as an alternating magnetic field, each with a different frequency.
[0008] On the receiving side, a positioning device is provided, which is arranged in a mobile inductive charging device (also referred to as vehicle assembly or VA), preferably located in or on the underbody of a vehicle. According to the 12.02.2026
[0009] 2
[0010] The standard features two receiving coils that detect the positioning magnetic fields generated by the transmitting coils, which are distinguishable due to their different frequencies. From this, the relative positioning of the inductive charging devices to each other, and thus ultimately the positioning of the vehicle relative to the ground-based inductive charging device, can be determined.
[0011] In principle, a different number of transmitting and receiving coils can be used in inductive charging devices. For example, it is generally sufficient if the transmitting positioning device has at least one transmitting coil and the receiving positioning device has at least one receiving coil.
[0012] The standard specifies the positioning of the mobile inductive charging device relative to the stationary inductive charging device (chapters 6, 8 and 12;
[0013] Annex D) stipulates that the VA (or its center point) should be positioned within a tolerance zone (“alignment tolerance area”) of 150 mm in the longitudinal direction of the vehicle or the intended longitudinal direction of the vehicle and of 200 mm in the (intended) transverse direction of the vehicle (opposite the stationary inductive charging device).
[0014] For the driver of a vehicle, it is therefore important during the positioning process to receive information regarding the position of the front axle in relation to the specified tolerance zone. This allows them to adjust the vehicle's direction and speed accordingly, or to prepare for braking in order to position the vehicle optimally. Information regarding the tolerance zone can be provided to the driver, for example, via a graphic and / or acoustic display.
[0015] From WO 2023 / 194515 A1, a method for detecting the relative position of a stationary inductive charging device to a mobile inductive charging device, which interact with each other in a charging operation for inductive energy transfer, is known. 12.02.2026
[0016] 3
[0017] The determination of information regarding the tolerance zone, in particular information about whether a reference point of the mobile inductive charging device (for example, the center point) lies within the tolerance zone and / or where it lies relative to this tolerance zone, is based on parameters that are usually significantly dependent on height.
[0018] When a vehicle is loaded, its height above the ground can change. This means that the specified parameters no longer optimally cover the actual tolerance zone. It has been shown that when the height or ground clearance is reduced, the "calculated tolerance zone" shrinks compared to the actual tolerance zone. Consequently, the driver's leeway for optimal parking decreases when the vehicle is loaded. In other words, the driver might not receive a stop signal even though the vehicle is already within the actual tolerance zone and thus positioned sufficiently well.
[0019] However, this problem does not only occur when the vehicle is loaded. The initially stored parameters also fail to provide accurate information about the actual tolerance range when the shock absorbers or tires are changed, and ultimately with any change in vehicle height.
[0020] Furthermore, the vehicle's ground clearance for an unloaded, off-the-assembly vehicle is typically subject to tolerances of ± 1 cm. Therefore, even the initially determined parameters are often not exact, meaning that parameters calculated based on the original height do not accurately reflect the tolerance zone specified by the standard or the actual tolerance zone, even if there is no change in height.
[0021] The present invention aims to overcome the aforementioned disadvantages, in particular to enable the most accurate possible reproduction of the actual tolerance zone. The most accurate possible reproduction of the actual tolerance zone means that for as many different actual tolerance zones as possible, the following applies: 12.02.2026
[0022] 4
[0023] Positions of a reference point (for example, the center point of the mobile inductive charging device) are necessary to accurately determine whether it lies within the tolerance zone. The options for positioning the mobile inductive charging device relative to the stationary inductive charging device should not be restricted more than necessary.
[0024] According to one aspect of the present invention, an inductive charging device for a vehicle is provided, with
[0025] an energy coil which is configured to receive an alternating magnetic field from another energy coil of another inductive charging device or to transfer the energy of an alternating magnetic field to another energy coil of another inductive charging device, and
[0026] one or more sensor devices, which are configured when the inductive charging device is designed as a mobile inductive charging device (and the other inductive charging device as a stationary inductive charging device), to detect a measured quantity related to a height and / or a change in height of the inductive charging device relative to a ground under the vehicle and to provide corresponding measurement data, or, when the inductive charging device is designed as a stationary inductive charging device (and the other inductive charging device as a mobile inductive charging device), to detect a measured quantity related to a height and / or a change in height of the stationary inductive charging device relative to an underbody of the vehicle and to provide corresponding measurement data.
[0027] According to a further aspect of the present invention, a device is provided for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone for the positioning of a mobile inductive charging device of a vehicle relative to a stationary inductive charging device, with
[0028] a receiving unit for receiving information about positioning fields of the mobile inductive charging device or the stationary inductive charging device
[0029] Charging equipment; 12.02.2026
[0030] 5
[0031] an evaluation unit for determining whether the reference point lies within the tolerance zone, based on the positioning fields and height-dependent threshold values, preferably determined by means of one or more sensor devices, and a
[0032] Output unit for providing information on whether the reference point lies within the tolerance zone.
[0033] According to a further aspect of the present invention, a method is provided for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone for the positioning of a mobile inductive charging device relative to a stationary inductive charging device, with
[0034] Receiving information about positioning fields of the mobile inductive charging device or the stationary inductive charging device;
[0035] Determining threshold values based on altitude information, preferably determined by means of one or more sensor devices.
[0036] - Comparing the threshold values with information about the positioning fields and determining from this whether the reference point lies within the tolerance zone;
[0037] Providing information on whether a reference point lies within the tolerance zone.
[0038] According to a further aspect of the present invention, a system is provided for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone for the positioning of a mobile inductive charging device relative to a stationary inductive charging device, with
[0039] a device for determining whether the reference point lies within a tolerance zone, and
[0040] A display unit for the visual, auditory and / or haptic indication of whether the reference point lies within the tolerance zone. 12.02.2026
[0041] 6
[0042] According to a further aspect of the present invention, a vehicle is provided with an inductive charging device according to the invention, wherein the vehicle in particular comprises the system according to the invention.
[0043] Preferred embodiments of the invention are defined in the dependent claims. It is understood that the claimed method and the claimed system have similar and / or identical preferred embodiments to the claimed device, in particular as defined in the dependent claims and as disclosed herein.
[0044] The invention is based on the idea of taking into account the distance or a change in distance between the two inductive charging devices for energy transfer in order to determine the tolerance zone for positioning one inductive charging device relative to another inductive charging device, in particular for determining whether a reference point (for example, the center of the front axle) lies within the tolerance zone, in particular taking into account the height or change in height of a mobile inductive charging device relative to a ground (in, under or on which the other inductive charging device is located) or taking into account the height or a change in height of a stationary inductive charging device relative to the underbody of the vehicle to be positioned.This ensures that the tolerance zone, or the information on whether a reference point (for example, the center of the front axle) lies within the tolerance zone, cannot be correctly determined due to inaccurate information about the vehicle height (above the ground) provided by the manufacturer, the vehicle's load, or modifications to the vehicle (such as tire changes, lowering, shock absorber replacement, etc.).
[0045] In particular, it can be avoided that the tolerance zone specified for the vehicle is smaller than the tolerance zone actually available. In other words, it can be avoided that, for positions where a reference point (for example, the center point of the mobile inductive charging device) lies within the tolerance zone, the information that this is the case is incorrect. 12.02.2026
[0046] 7
[0047] This will be achieved. If this issue is resolved, the driver of a vehicle (or the vehicle itself) will thus be granted greater, i.e., in the optimal case, complete freedom of movement for positioning the vehicle relative to a stationary inductive charging device. Furthermore, a factory height measurement of the vehicle (relative to the ground (more precisely, the ground surface)) can be dispensed with.
[0048] Therefore, the strict requirements regarding height tolerances in vehicle production can also be relaxed.
[0049] According to the invention, the distance (or change in distance) of the inductive charging device to the ground (or to the other inductive charging device) is first determined. It is assumed that it is irrelevant whether the other inductive charging device is located on the ground, flush with the ground surface, or below the ground surface, since the fields provided by the ground-based inductive charging device should (by default) show no difference in this respect. If this assumption should not be correct, the height / change in height to the ground is to be understood as the distance or change in distance between the mobile inductive charging device and the stationary inductive charging device, and the height / change in height to the underbody of the vehicle is to be understood as the distance or change in distance between the stationary inductive charging device and the mobile inductive charging device.
[0050] Taking into account the height information ("measurement data") precisely acquired by the inductive charging device according to the invention, the tolerance zone can then be determined by means of the device according to the invention in (almost) complete agreement with the tolerance zone specified by the standard. In other words, the information that a reference point (for example, the center point of the mobile inductive charging device) lies within the tolerance zone can be correctly obtained for (almost) all points within the tolerance zone.
[0051] A reference point can be, in particular, the center point of the mobile inductive charging device. Specifically, "center point" refers exclusively to a 12.02.2026
[0052] 8
[0053] A plane that runs parallel to the surface. A reference point always corresponds to a (conceived) tolerance zone on or parallel to the stationary inductive charging device. Generally, the reference point is positioned relative to the tolerance zone such that optimal power transfer between the mobile and stationary inductive charging devices occurs when the reference point is located at or above the center of the tolerance zone, and sufficient power transfer occurs when the reference point is located within the tolerance zone.
[0054] For example, in the case of asymmetrical or non-concentric coil shapes, or different coil shapes on the VA and GA sides, the reference point can differ from a geometric center point of the VA. In principle, with a suitable corresponding tolerance zone, any location on the mobile inductive charging device or even the vehicle itself can be chosen as the reference point.
[0055] In particular, the tolerance zone is a two-dimensional area (extending parallel to the surface) within which a specific reference point of the mobile inductive charging device is intended to lie for the positioning to be considered sufficient for power transfer. A tolerance zone need not be visible or marked in any way. It can be a specification, for example, from a standard. Since a tolerance zone always refers to a two-dimensional area, "lying within the tolerance zone" means that the reference point of the charging device overlaps laterally with, or lies above, the tolerance zone.
[0056] The information regarding whether a reference point of a mobile inductive charging device lies within the tolerance zone is to be understood here as binary (yes / no) information. It is usually the final result of a measurement processing sequence and can be used as the basis for outputting a stop signal.
[0057] The terms height, height change, and height information(s) refer to quantities relating to the height and / or height change of the mobile inductive charging device perpendicular to a ground / substrate and / or the stationary 12.02.2026
[0058] 9
[0059] Inductive charging device under the vehicle. The height information can include, in particular, the vertical distance (distance in the z-direction) between the front axle and the front axle, or values proportional to this.
[0060] According to a preferred embodiment, the height or height information can be determined by measurements using a sensor device inside or outside the mobile inductive charging device. In principle, it is also possible that the height information is not measured but manually specified, for example, the nominal height relative to a specific vehicle.
[0061] The one or more sensor devices, configured to detect a measurement regarding the height and / or change in height of the mobile inductive charging device relative to the ground beneath the vehicle, or to detect a measurement regarding the height and / or change in height of the stationary inductive charging device relative to the underbody of the vehicle, are configured to provide corresponding measurement data to the device according to the invention for determining whether a reference point lies within the tolerance zone. Provision to other devices, in particular computing units, is also conceivable.
[0062] The one or more sensor devices are functionally part of the inductive charging device, as they provide signals that can be used for its positioning. The one or more sensor devices can be located spatially with the other components of the inductive charging device (for example, in a common housing). However, it is also possible for the one or more sensor devices to be located at a distance from the other components of the inductive charging device. In particular, the one or more sensor devices can also provide signals for purposes other than positioning.
[0063] The receiving unit of the device according to the invention is configured to receive information about the positioning fields, in particular from a positioning receiving device of the (mobile or stationary) inductive charging device (with a positioning field of an inductive 12.02.2026
[0064] 10
[0065] The term "charging device" refers to a positioning field provided or emitted by this inductive charging device. This means that when the stationary inductive charging device emits positioning fields, the device's receiving unit can receive information about the positioning fields received by the mobile inductive charging device (which is to be positioned relative to the stationary inductive charging device). Conversely, when the mobile inductive charging device emits positioning fields, the device's receiving unit can receive information about the positioning fields received by the stationary inductive charging device (which is to be positioned relative to the mobile inductive charging device). It is also conceivable that the information about the positioning fields could be obtained from another source.
[0066] The receiving unit of the device can be configured to receive measurement data from one or more sensor devices of the inductive charging device according to the invention. This data may include information about the height and / or changes in height of the mobile inductive charging device relative to the ground beneath the vehicle, and / or information about the height and / or changes in height of the stationary inductive charging device relative to the underbody of the vehicle. However, this measurement data or...
[0067] Information about the height and / or changes in height of the inductive charging device relative to the ground beneath the vehicle can also be received from other sources, such as another sensor device on the vehicle or a storage unit that has stored such information about the vehicle, or from a sensor device on, in, or beneath the ground on which the vehicle is located. The information about the positioning fields and / or the measurement data can be received by the receiving unit, for example, via a CAN (Controller Area Network) bus, LIN (Local Interconnect Network) bus, Automotive Ethernet, direct wiring, or wirelessly (e.g., via Bluetooth, WiFi, or NFC (Near Field Communication)). 12.02.2026
[0068] 11
[0069] The evaluation unit can calculate and / or adjust the parameters for determining the tolerance zone, in particular the information on whether a reference point (for example, the center point of the mobile inductive charging device) lies within the tolerance zone, based on information from the positioning fields and taking into account the measurement data or elevation information. Therefore, determining the parameters does not necessarily mean that the parameters (more precisely, their values) must be completely recalculated. Adjusting existing parameter values—for example, threshold values—based on the measurement data or elevation information is also possible. The parameters themselves (not their values) are predetermined and suitable for defining the tolerance zone.
[0070] The parameters (or their values) determined from the positioning field data, taking into account the elevation (change) data, describe the tolerance zone, in particular the information on whether a reference point of a mobile inductive charging device lies within the tolerance zone, in an improved manner and essentially reflect the tolerance zone specified by the standard, which is actually permitted, correctly. The determined information on whether a reference point of a mobile inductive charging device lies within the tolerance zone is an assumption / decision / evaluation. A correct representation of the tolerance zone here means that the information on whether a reference point of a mobile inductive charging device lies within the tolerance zone actually corresponds to reality for as many points as possible, i.e., that there are as few or no "false positives" and "false negatives" as possible.This is primarily because the positioning fields, and even their relationships to one another, depend on the height or distance at which they are detected. Taking this effect into account therefore allows for a more precise determination of the tolerance zone.
[0071] The method according to the invention eliminates the need to consider all three spatial directions directly and in one step. It suffices to determine the positioning within an XY plane parallel to the surface using the positioning fields. Height information can be determined independently of this. 12.02.2026
[0072] 12
[0073] The procedure / system is provided. This separation allows for a high degree of flexibility regarding the height information. It can be determined using similar or different sensors, it can be measured inside or outside the mobile inductive charging device, it can be determined less frequently than, for example, the positioning fields, or it can even be specified completely manually. Height information then only flows into the actual determination of the position or the information on whether a reference point of a mobile inductive charging device lies within the tolerance zone as a parameter or threshold value.
[0074] The system's display unit for indicating whether a reference point of a mobile inductive charging device lies within the tolerance zone is preferably a display. Alternatively, the display unit could be a loudspeaker that emits tones, signals, or voice prompts to provide information about the tolerance zone. The intensity or frequency of a vibration could also be used for this purpose.
[0075] In a preferred embodiment of the inductive charging device, the charging device has a positioning receiver device with at least one receiving coil for receiving positioning fields from the other inductive charging device and for providing information about the positioning fields.
[0076] The positioning receiver of the inductive charging device according to the invention (which can be a mobile or stationary inductive charging device) preferably has two cross-shaped receiving coils, wherein the angle between the radial longitudinal directions of the receiving coils is preferably substantially 90° (in this case, it is also referred to as a "cross coil"). It is also conceivable that the positioning receiver has more than two coils that intersect, wherein the angle between the radial longitudinal directions of adjacent receiving coils is preferably the same, i.e., preferably 60° in the case of three intersecting receiving coils. The receiving coil is generally a solenoid coil. The main extension direction of the 12.02.2026
[0077] 13
[0078] The winding of the receiving coil is perpendicular to the winding axis.
[0079] referred to as the radial longitudinal direction.
[0080] Preferably, the one or more sensor devices are implemented separately from the positioning receiver. The inductive charging device includes a control unit configured to perform a positioning procedure based on the received positioning fields, using threshold values based on the measurement data in the positioning procedure.
[0081] In particular, the sensor device may use a fundamentally different measurement technology (e.g., ultrasound) than the positioning receiving device (positioning fields).
[0082] In general, the control unit is functionally part of the inductive charging device.
[0083] In one embodiment, the control unit is located with other components of the inductive charging device (for example, in a common housing). In another embodiment, the control unit is located at a distance from other components of the inductive charging device. In yet another embodiment, the control unit is located outside of a housing of the inductive charging device. The control unit can be part of a larger control unit in the vehicle and / or part of another computing unit.
[0084] A threshold is a parameter used to distinguish between states.
[0085] For example, a decision made before reaching the threshold, e.g., whether the positioning is sufficient, may change when the threshold is reached.
[0086] Determining thresholds also includes adjusting existing thresholds.
[0087] An inductive charging device designed according to the invention is advantageous because the positioning receiving device can, for example, be configured to independently provide data for positioning, while the sensor device independently provides measurement data which then serve as threshold values for a more precise 12.02.2026
[0088] 14
[0089] To enable positioning. For example, the measurement data could be altitude information, and a threshold for positioning could be set depending on the altitude.
[0090] In a preferred embodiment of the inductive charging device, the inductive charging device further comprises one or more flux guide elements around which the at least one receiving coil of the positioning receiving device is wound, wherein at least one of the one or more sensor devices is arranged on one of the one or more flux guide elements or is arranged between at least two flux guide elements.
[0091] The flux-guiding element is preferably configured to guide a magnetic field in a predetermined manner. It possesses a high magnetic permeability with p. r >1 , preferably p r >50, especially preferred p r>100. The flux guide element forms a magnetic core for the receiving coil. In particular, the magnetic field is influenced by the high permeability so that the receiving coil can absorb the largest possible magnetic flux. With the flux guide element, the receiving coil absorbs a greater magnetic flux than without a flux guide element, all other parameters being equal. The flux guide element can be made of a ferromagnetic or, preferably, a ferrimagnetic material, most preferably ferrite. It can preferably be designed in a plate-like form—as a planar core—and be arranged in the inductive charging device on the side of the energy coil facing away from the other inductive charging device. The one or more sensor devices can also be mounted on this side of the flux guide element, but they can also be located on the opposite side.If multiple sensor devices are present, they must be arranged on both sides. The sensor devices can be attached to the flow guide element, for example, by means of an adhesive, screw, or plug connection. Other types of arrangement or fastening are also conceivable. 12.02.2026.
[0092] 15
[0093] If at least two flow guide elements are present, the one or more sensor devices can also be located between them. A particular advantage of this position is that the available installation space can be optimally utilized. Furthermore, if the one or more sensor devices are connected via cables, the cables can be easily routed away from the inductive charging device.
[0094] In a further embodiment, the inductive charging device also has a carrier plate for receiving the energy coil, wherein at least one of the one or more sensor devices is arranged on the carrier plate.
[0095] The carrier plate is preferably a plastic plate, for example a carrier plate made of glass fiber reinforced plastic or a polymer composite. Plastic is a preferred choice due to its good processability and the fact that it does not influence magnetic fields.
[0096] The one or more sensor devices can be connected to the carrier plate, for example, via an adhesive, screw or plug connection, or the like.
[0097] In a preferred embodiment of the inductive charging device, it is provided that at least one of the one or more sensor devices is arranged on the receiving coil, in particular on a circuit board and / or a ribbon cable of the receiving coil.
[0098] The receiving coil can be implemented as a coil in the form of conductive traces on a circuit board (or multiple circuit boards). For example, a circuit board can be mounted on each of the two main sides of a flux guide element, with the conductive traces on these two boards forming the receiving coil. The conductive traces on the different sides of the flux guide element can be connected, for example, by vias between the conductive traces. It is conceivable that at least one of the circuit boards contains one or more sensor devices. All (still available) positions on the circuit board are possible. 12.02.2026
[0099] 16
[0100] One or more sensor devices can be additionally or alternatively mounted on a flat ribbon cable of the receiving coil.
[0101] In a further preferred embodiment of the inductive charging device, the one or more sensor devices comprise an ultrasonic sensor; a compensated or uncompensated coil; a radar sensor; an ultra-wideband sensor; a laser sensor, in particular a LiDAR sensor; a time-of-flight camera; and / or an optical distance sensor.
[0102] The listed sensors are particularly well suited to measuring distances typical for a vehicle-side inductive charging device to the ground under the vehicle.
[0103] Ultrasonic sensors are particularly distinguished by their cost-effectiveness and robustness, enabling highly accurate distance measurements. Even in the presence of dust and dirt, or in poor lighting conditions (typical for vehicle undercarriages), ultrasonic sensors generally function reliably. Ultra-wideband sensors can also be used for distance measurement.
[0104] In a particularly preferred embodiment of the inductive charging device, the one or more sensor devices are essentially made of a non-metallic material and / or the one or more sensor devices are arranged at a distance from the energy coil.
[0105] The use of non-metallic materials can prevent overheating caused by the magnetic field of the energy or positioning receiving coils. Electromagnetic interference with the sensors can also be avoided. The non-metallic material can be, in particular, a plastic (e.g., acrylonitrile butadiene styrene or polycarbonate, especially 12.02.2026).
[0106] 17
[0107] suitable for covers / housings of sensor devices), ceramics (e.g.
[0108] aluminium oxide or zirconium oxide) or a fiber composite material.
[0109] The central component of an ultrasonic sensor is the piezoelectric disc or membrane, which generates and / or receives ultrasonic waves. This can be made, for example, of lead zirconate tanate or similar piezoelectric ceramics. Likewise, the housing of the sensors listed can be made of a non-metallic material.
[0110] The term "essentially made of a non-metallic material" in this context means that the one or more sensor devices (each) are predominantly, preferably almost entirely (i.e., except for electrical connections), made of a non-metallic material. At least the housing of the sensor devices is preferably made of a non-metallic material.
[0111] Preferably, the one or more sensor devices are also substantially vibration-resistant. Particularly preferably, the one or more sensor devices are made substantially of a vibration-resistant, non-metallic material.
[0112] In principle, the distance to the energy coil should be chosen so that the magnetic flux or any heating caused by the magnetic flux during energy transfer between the inductive charging device and the other inductive charging device at the location of one or more sensor devices is as low as possible.
[0113] In a preferred embodiment of the inductive charging device, the one or more sensor devices are arranged centrally in the main plane of extension of the inductive charging device and / or arranged in one or more corners of the inductive charging device. 12.02.2026
[0114] 18
[0115] These locations typically offer ample space for one or more sensor devices and are characterized by the fact that the magnetic flux, and therefore any heating caused by the magnetic flux during energy transfer between the inductive charging devices, is generally relatively low at these points. Consequently, the functionality of the sensor devices is only minimally affected, if at all, by the magnetic flux at these locations.
[0116] In the case of an arrangement in the corners, particularly when a positioning receiving device designed as a cross coil is present, the arrangement of the sensor devices on the ends of the outwardly pointing arms of the cross (which usually end in the corners of the inductive charging device) is conceivable.
[0117] In an advantageous embodiment, the one or more sensor devices are arranged separately and at a distance from the inductive charging device.
[0118] A separate and spaced arrangement of the sensor device(s) can be advantageous, since sensor devices for height measurement may already be located elsewhere in the vehicle, for example for other purposes.
[0119] In one configuration, measurement data from one or more sensor devices in the vehicle are additionally used by other components (independent of the inductive charging device).
[0120] In a preferred embodiment of the device for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone for the positioning of a mobile inductive charging device relative to a stationary inductive charging device, the evaluation unit is further configured (when the receiving unit receives information about the positioning fields of the stationary inductive charging device) to determine the position of the mobile inductive charging device relative to the tolerance zone, and the output unit is further configured to output information about the position of the mobile inductive charging device relative to the tolerance zone.
[0121] 19
[0122] The evaluation unit is further equipped (when the receiving unit receives information about the positioning fields of the mobile inductive charging device) to determine the position of the mobile inductive charging device relative to the tolerance zone, and the output unit is further equipped to output information about the position of the mobile inductive charging device relative to the tolerance zone.
[0123] This configuration therefore not only determines whether a reference point of the mobile inductive charging device lies within the tolerance zone, but also determines where the mobile (or stationary) inductive charging device (or the reference point) is located in relation to the tolerance zone. This allows for a simple determination of how the mobile inductive charging device or the vehicle should be positioned or navigated to ensure optimal positioning of the mobile and stationary inductive charging devices relative to each other.
[0124] In particular, if the reference point of the mobile inductive charging device is still outside the tolerance zone, it can be determined in which direction the vehicle must move to achieve a position within the tolerance zone.
[0125] According to one embodiment, if the reference point lies within the tolerance zone, it is determined where and how it is located within the tolerance zone.
[0126] According to one implementation variant, in addition to the information on whether a reference point is within the tolerance zone, the entire tolerance zone can be determined (for example, calculated). The driver can then be shown a graphical representation of the determined tolerance zone and the current position of the reference point.
[0127] In one embodiment of the system, the evaluation unit of the device is further configured (when the receiving unit receives information about the positioning fields of the stationary inductive charging device) to determine the position of the mobile inductive charging device relative to the tolerance zone and the output unit. 12.02.2026
[0128] 20
[0129] The device is further configured to output information about the position of the mobile inductive charging device relative to the tolerance zone, or the evaluation unit is further configured (if the receiving unit receives information about the positioning fields of the mobile inductive charging device) to determine the position of the mobile inductive charging device relative to the tolerance zone, and the output unit is further configured to output information about the position of the mobile inductive charging device relative to the tolerance zone, wherein the display unit of the system is further configured to display the position of the (mobile or stationary) inductive charging device relative to the tolerance zone visually, audibly and / or haptically.
[0130] The display unit is preferably a screen for showing the position of the inductive charging device relative to the tolerance zone. Alternatively, the display unit could be a speaker that emits tones, signals, or voice prompts to indicate the position relative to the tolerance zone. The intensity or frequency of a vibration could also be used to display this information.
[0131] In a preferred embodiment of the system, the system further comprises an inductive charging device according to the invention.
[0132] In a preferred embodiment, the inductive charging device is configured to carry out a method according to the invention for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone.
[0133] In a preferred embodiment, a device for determining whether a reference point lies within a tolerance zone can use a sensor device with features as disclosed in the context of an inductive charging device for determining threshold values. 12.02.2026
[0134] 21
[0135] In a preferred embodiment, a method for determining whether a reference point of a mobile inductive charging device lies within a tolerance zone can use a sensor device with features as disclosed in the context of an inductive charging device to determine threshold values.
[0136] Further execution options are shown below:
[0137] According to one embodiment, a device for determining a tolerance zone for the positioning of a mobile inductive charging device of a vehicle relative to a stationary inductive charging device is provided, with a receiving unit for receiving measurement data which includes information about a height and / or a change in height of the mobile inductive charging device relative to a ground under the vehicle, and / or measurement data which includes information about a height and / or a change in height of the stationary inductive charging device relative to an underbody of the vehicle, and for receiving information about positioning fields of the mobile inductive charging device or the stationary inductive charging device;
[0138] an evaluation unit for determining parameters that describe the tolerance zone, based on the measurement data and the information about the positioning fields, and a
[0139] Output unit for providing the parameters.
[0140] According to a further embodiment, a method for determining a tolerance zone for the positioning of a mobile inductive charging device relative to a stationary inductive charging device is provided, with receiving measurement data which includes information about a height and / or a change in height of the inductive charging device relative to the ground under the vehicle, and / or measurement data which includes information about a height and / or a change in height of the stationary inductive charging device relative to an underbody of the vehicle, and receiving information about 12.02.2026
[0141] 22
[0142] Positioning fields of the mobile inductive charging device or the stationary inductive charging device;
[0143] Determining parameters that describe the tolerance zone, based on the measurement data and information about the positioning fields, and
[0144] Providing the parameters.
[0145] According to another embodiment, a system is provided for determining a tolerance zone for the positioning of a mobile inductive charging device relative to a stationary inductive charging device, with
[0146] a device for determining a tolerance zone according to the present disclosure, and
[0147] a display unit for the visual, auditory and / or haptic display of the tolerance zone based on the provided parameters.
[0148] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.
[0149] Exemplary embodiments of the invention are shown in the following drawings and are explained in more detail in the following description, where identical reference numerals refer to identical, similar, or functionally equivalent components. The drawings show:
[0150] Fig. 1 shows a block diagram of an embodiment of a device according to the invention for determining a tolerance zone for the positioning of a mobile inductive charging device of a vehicle relative to a stationary inductive charging device; Z23090WQ
[0151] February 12, 2026
[0152] 23
[0153] Fig. 2 shows a highly simplified representation of an embodiment of a vehicle according to the invention (with an inductive charging device and a system according to the invention);
[0154] Figs. 3A and 3B each show a representation of a tolerance zone determined using positioning field data, compared to an actual tolerance zone for different ground clearances;
[0155] Fig. 4 shows a first embodiment of an inductive charging device according to the invention in a top view;
[0156] Fig. 5 shows a second embodiment of an inductive charging device according to the invention in a top view;
[0157] Fig. 6 shows a third embodiment of an inductive charging device according to the invention in a top view;
[0158] Fig. 7 shows a fourth embodiment of an inductive charging device according to the invention in a top view;
[0159] Fig. 8 shows an exemplary flow guidance element of an inductive charging device according to the invention with three sensor devices in a perspective view; and
[0160] Fig. 9 shows a fifth embodiment of an inductive charging device according to the invention in a top view; and
[0161] Fig. 10 shows another exemplary flow guide element of an inductive charging device according to the invention with three sensor devices in a cross-sectional view. 12.02.2026
[0162] 24
[0163] Fig. 1 shows a block diagram of an embodiment of a device 100 according to the invention for determining a tolerance zone for the positioning of an inductive charging device 10 of a vehicle 50 relative to another inductive charging device 20, or for determining whether a reference point of a vehicle lies within the tolerance zone. The device 100 comprises a receiver unit 102, an evaluation unit 104, and an output unit 106. The receiver unit 102 is configured to receive information about positioning fields emitted by the other inductive charging device 20 and received, for example, by a positioning receiver 12 of the inductive charging device 10.The receiving unit 102 is further configured to receive measurement data, in addition to the information about the positioning fields. This data includes information about the height (marked with the reference symbol "H") and / or a change in height of the inductive charging device 10 relative to a ground (more precisely, the ground surface) 35 below the (mobile) inductive charging device 10. In this respect, the receiving unit receives data about the position of the inductive charging device 10 in a plane parallel to the ground plane via the information about the positioning fields, and data about the position (or a change in position) of the inductive charging device 10 in the vertical direction (i.e., in a direction perpendicular to the ground plane) via the measurement data.
[0164] Evaluation unit 104 is configured to process this data. Based on the information about the positioning fields and the measurement data (height information), the evaluation unit can determine parameters that describe the tolerance zone. More precisely, evaluation unit 104 is configured to use the received information about the positioning fields and the measurement data to determine the values of (predefined) parameters or thresholds of a predetermined mathematical model for calculating or determining the tolerance zone (or to adjust existing values). In other words, parameter values or thresholds can be determined that ultimately provide information on whether a reference point lies within the tolerance zone, i.e., the zone within which the center point or another reference point of the inductive charging device 10 can be located when a 12.02.2026
[0165] 25
[0166] Energy transfer is to take place between the inductive charging devices 10 and 20. The output unit 106 then provides the calculated parameter values for further processing.
[0167] Fig. 2 shows an exemplary mobile inductive charging device 10, which is arranged on a vehicle 50 with an energy storage device 3 and is positioned above a stationary inductive charging device 20. During operation, energy can be transferred from the stationary inductive charging device 20 to the mobile inductive charging device 10, thereby charging the vehicle's energy storage device 3.
[0168] The mobile inductive charging device 10 and the stationary inductive charging device 20 together form, or are part of, a vehicle charging system 8. In principle, it is also possible to operate the vehicle charging system 8 bidirectionally. In this case, energy can be temporarily transferred from the mobile inductive charging device 10 to the stationary inductive charging device 20. The stationary inductive charging device 20, which is arranged on the surface 35 in Fig. 2, can alternatively be recessed into the surface 35 (not shown here). In a recessed arrangement, the inductive charging device 20 can be covered by certain layers of the surface 35 (or the roadway) or be flush with the roadway surface. The mobile inductive charging device 10 is, for example, mounted in or on the underbody of the vehicle 50.Both inductive charging devices 10 and 20 each have an energy coil 11 (energy transfer winding) and preferably several flux guide elements 16 (not shown in Fig. 2).
[0169] To position the mobile inductive charging device 10 relative to the stationary inductive charging device 20, the stationary inductive charging device 20 comprises one or more transmitting coils which emit positioning fields. The mobile inductive charging device 10 comprises a positioning receiver 12 with one or more receiving coils 13 for receiving the positioning fields. This allows the positioning of the two inductive charging devices in a plane parallel to the 12.02.2026
[0170] 26
[0171] The mobile inductive charging device 10 is positioned at a distance of 35° from the ground level. To initiate energy transfer, the SAE J2954 standard from August 2024 stipulates that the mobile inductive charging device 10 must be located within a tolerance zone around the center point of the stationary inductive charging device 20 in a plane parallel to the ground level.
[0172] To determine information about the tolerance zone, in particular the height of the vehicle 50 relative to the ground 35, the inductive charging device 10 includes a sensor device 14 configured to measure the height (and / or changes in height) of the vehicle relative to the ground 35, or the ground clearance H. The measurement data describing the height and / or changes in height are transmitted to the device 100 located in the vehicle 50 for determining the tolerance zone. Based on the measurement data and the data from the positioning fields of the positioning receiver device 12, the device determines parameters that describe the tolerance zone and ultimately indicate whether a reference point of the front axle lies within the tolerance zone. The information about the tolerance zone is displayed via the display unit 200, which is designed as a display.
[0173] Fig. 3A shows a graphical representation of a tolerance zone determined based on positioning field data (i.e., information about positioning fields (emitted by a stationary inductive charging device 20)) at a ground clearance, i.e., the distance of a vehicle's inductive charging device 10 from the ground 35, of nominally 210 mm, compared to an actual tolerance zone at an (actual) ground clearance of 210 mm. In particular, Fig. 3A shows four transmitting coils 27 of a stationary inductive charging device, each arranged in a corner of a rectangle. Furthermore, the center point 25 of the stationary inductive charging device or a GA (in a plane parallel to the ground plane) and a frame 30 around the tolerance zone specified by the standard are shown. For each point, it is shown whether the system used has determined that the center point of the mobile inductive charging device 10, when at that point, is within the tolerance zone.2026.
[0174] 27
[0175] The point is either within the tolerance zone (in which case it is displayed in black) or outside (in which case it is displayed in gray). With optimal calculation, all points within frame 30, or the actual tolerance zone, would be displayed in black, and all points outside frame 30 around the tolerance zone would be displayed in gray. The points indicate possible positions of the center point of the mobile inductive charging device 10, or the VA (in a plane parallel to the ground plane). In other words, a black point represents a stop signal, meaning that a change in the positioning of the mobile inductive charging device 10 is considered unnecessary. Conversely, if a point is displayed in gray, this means that the center point of the mobile inductive charging device 10 is located outside the calculated tolerance zone at that point.In other words, a grey dot represents a signal to continue driving; energy transfer is not yet possible at this point due to the calculated tolerance zone.
[0176] According to the graphical representation in Fig. 3A, the calculated and the actual tolerance zones essentially coincide, since almost all points within frame 30, or the actual tolerance zone, are shown in black, and all points outside the tolerance zone are shown in gray. A gray point within the tolerance zone is undesirable but acceptable, whereas a black point outside the tolerance zone indicates to the user an operating point where loading is actually not possible. This is unacceptable. A subsequent so-called
[0177] "Alignment Check" can lead to a situation where, in the latter case, the user is misled into believing that the vehicle is correctly aligned, but cannot be loaded. The example in Fig. 3A shows that the system works well when the altitude information used corresponds to the actual altitude.
[0178] Fig. 3B shows a graphical representation of a tolerance zone determined using positioning field data, with a nominal ground clearance of 210 mm used to determine the threshold values. However, the actual ground clearance was 185 mm.
[0179] As can be clearly seen in Fig. 3B, the "calculated tolerance zone" has decreased compared to the display in Fig. 3A. Within the frame 12.02.2026
[0180] 28
[0181] There are significantly more gray dots around the actual tolerance zone. At these points, it is suggested that further positioning is still necessary, even though the center point of the mobile inductive charging device 10 is already within the actual tolerance zone at these points. This reduction of the "calculated tolerance zone" compared to the actual tolerance zone is ultimately due to the fact that threshold values were used for the calculation that apply to a ground clearance of 210 mm, but not to the reduced ground clearance of 185 mm. It is therefore evident that the system does not function optimally when the height information used does not correspond to the actual height information.In the present example, no situation arises where permission to load outside the tolerance zone has been granted, but positioning is unnecessarily complicated for the driver because the system demands more precise positioning than required. Therefore, it is advantageous to use sensors that can determine the actual altitude information as accurately as possible.
[0182] Fig. 4 shows a first embodiment of a (mobile) inductive charging device 10 according to the invention in a top view (in principle, it could also be a stationary inductive charging device). The inductive charging device 10 comprises an energy coil 11, a positioning receiver device in the form of two energy coils 13a and 13b, and a sensor device 14. Furthermore, the inductive charging device 10 shown includes flux guide elements 16, which are arranged radially around the center Z (shown in Fig. 6) of the energy coil 13 in the plane (Z here also denotes the center of the support plate 18 or of the inductive charging device 10). The aforementioned components are arranged on or attached to a support plate 18.
[0183] The energy coil 11, which is designed as a flat coil in this case, is configured to receive an alternating magnetic field from another energy coil of another inductive charging device or to transmit an alternating magnetic field to another energy coil of another inductive charging device. The energy coil 11 (shown with dashed lines) is obscured in the illustrated top view by the flux guide elements 16 and the support plate 18. 12.02.2026
[0184] 29
[0185] The receiving coils 13a and 13b are configured to receive positioning fields from the other (in this case, the stationary) inductive charging device and to provide information about the received positioning fields. While receiving coil 13a is wound around one of the flux guide elements 16, receiving coil 13b is wound around another flux guide element 16. Both receiving coils 13a and 13b are designed as cylindrical coils. The sensor device 14 is configured to detect a measured quantity related to the height and / or changes in height of the inductive charging device 10 relative to a ground 35 beneath the vehicle and to provide corresponding measurement data. The sensor device 14 is arranged on the carrier plate 18, specifically at its center, i.e., in the top view shown, above the center of the energy coil 18.
[0186] The flux guide elements 16 perform the function of magnetic field guidance during energy transfer. In the charging state, the magnetic field lines run approximately radially within them. Since the receiving coils 13a and 13b are also radially aligned and thus at least approximately parallel to the magnetic field lines 35, relatively little to no voltage is induced in these coils. This is important because, at the high power levels of energy transfer, the receiving coils could otherwise easily be destroyed.
[0187] The position of the sensor device 14, which is located in the center of the energy coil 11 in the illustrated top view, is also advantageously chosen because the influence of interfering fields can be assumed to be relatively low in this position as well. The sensor device 14 is arranged so that it points towards the ground below the vehicle (when installed in a vehicle).
[0188] Fig. 5 shows a second embodiment of an inductive charging device 10 according to the invention in a top view. The second embodiment differs from the first embodiment only with regard to the position of the sensor device(s) 14. While the first embodiment has only a single sensor device 1412.02.2026
[0189] 30
[0190] The second embodiment comprises two sensor devices 14a and 14b. These are each arranged in a corner of the rectangular inductive charging device 10. Sensor device 14a is arranged on the receiving coil 13b. Sensor device 14b is arranged on one of the flux guide elements 16, which extends towards the lower left corner, outside the area of the energy coil 11. The arrangement of the sensor devices 14a and 14b in the corners of the inductive charging device has the advantage of providing a particularly large amount of installation space and thus simplifying assembly.
[0191] Fig. 6 shows a third embodiment of an inductive charging device 10 according to the invention in a top view. In this embodiment, four receiving coils 13a, 13b, 13c, and 13d are provided, each receiving coil being arranged around a different flux guide element 16. Together, the four receiving coils form a cross-shaped arrangement. Furthermore, the inductive charging device 10 in the embodiment shown in Fig. 6 comprises a total of five sensor devices 14a, 14b, 14c, 14d, and 14f, wherein the four sensor devices 14a, 14b, 14d, and 14f are arranged in the corners of the rectangular inductive charging device 10 on the receiving coils 13a, 13b, 13c, and 13d, and the sensor device 14c is arranged in the center of the inductive charging device 10 or the carrier plate 18. The sensor device 14c can be arranged on a circuit board on the carrier plate.
[0192] Fig. 7 shows a fourth embodiment of an inductive charging device 10 according to the invention in a top view. Apart from the arrangement of the sensor devices, the inductive charging devices shown in Figs. 6 and 7 do not differ.
[0193] As can be seen in Fig. 7 (and Fig. 6), narrow gaps are located between the flux guide elements 16. Like the flux guide elements 16, the gaps extend radially around the center Z of the inductive charging device 10. Thus, the gaps run approximately in the main direction of the magnetic field lines that arise during energy transfer in the flux guide elements 16.
[0194] One of the two sensor devices shown is present (the sensor device 12.02.2026).
[0195] 31
[0196] 14a) is arranged in one of the gaps between the flow guide elements 16. The other sensor device 14b is arranged on the carrier plate 18 outside the area of the flow guide elements 16.
[0197] Fig. 8 shows an exemplary flux guide element 16 of an inductive charging device 10 according to the invention, comprising three sensor devices 14a, 14b, and 14c, in a perspective view. A circuit board 17 is arranged on each of the two large sides of the flux guide element 16 (one of the circuit boards is only partially visible in Fig. 8). Conductive traces 19 arranged on the two circuit boards 17 together form a receiving coil 13. The conductor traces 19 are connected between the circuit boards 17 by means of vias. The connection of the conductor traces 19 is designed such that they run in a helical winding around the flux guide element 16. The sensor device 14a is arranged directly on the flux guide element 16 and spaced apart from the circuit board 17. In contrast, the sensor devices 14b and 14c are arranged on the circuit board 17, specifically at opposite ends of the (fully) visible circuit board 17.
[0198] Fig. 9 shows a fifth embodiment of an inductive charging device according to the invention in a top view. In the fifth embodiment, the inductive charging device 10 comprises an exemplary rectangular support plate 18, which carries or accommodates a rectangular energy coil 11, three receiving coils 13a, 13b, 13c and 13d and five sensor devices 14a, 14b, 14c, 14d and 14e. Furthermore, in this embodiment, the inductive charging device 10 comprises several rectangular flux guide elements 16.
[0199] Fig. 10 shows a further exemplary flux guide element 16 of an inductive charging device according to the invention with three sensor devices 14a, 14b and 14c in a cross-sectional view. The flux guide element 16 has circuit boards 17a and 17b mounted on both sides, with the strands 19 of the energy coil 11 running "under" the circuit board 17b being shown. As can be seen in Fig. 10, the sensor devices 14a, 14b and 14c are located directly on the circuit board 17b.
[0200] 32
[0201] wherein the sensor device 14b is arranged centrally in the coil, which consists of the strands 19. 12.02.2026
[0202] 33
[0203] Reference symbol list
[0204] Energy storage
[0205] Vehicle charging system
[0206] 10 inductive charging devices (mobile)
[0207] 11 Energy coil
[0208] 12 Positioning receiver device
[0209] 13, 13a, 13b, 13c, 13d Receiving coil
[0210] 14, 14a, 14b, 14c, 14d, 14e sensor device
[0211] 16 Flow guide element
[0212] 17, 17a, 17b circuit board
[0213] 18 Carrier plate
[0214] 19 conductor track
[0215] 20 inductive charging devices (stationary)
[0216] 27 Transmitting coil
[0217] 30 frames
[0218] 35 Floor
[0219] 37 Underbody (of the vehicle)
[0220] 50 vehicles
[0221] 100 Device for determining information about the tolerance zone 102 Receiving unit
[0222] 104 evaluation unit
[0223] 106 output units
[0224] 200 display units
[0225] H height
[0226] Z Center of the support plate
Claims
February 12, 2026 34 Patent claims 1. Inductive charging device (10, 20) for a vehicle charging system (8), comprising an energy coil (11) configured to receive an alternating magnetic field from another energy coil of another inductive charging device (20) or to transmit an alternating magnetic field to another energy coil of another inductive charging device (20), and one or more sensor devices (14) are installed when the inductive charging device (10, 20) is configured as a mobile inductive charging device (10) to detect a measured quantity related to a height and / or a change in height of the inductive charging device (10) relative to a ground (35) under the vehicle and to provide corresponding measurement data, or when the inductive charging device (10, 20) is configured as a stationary inductive charging device (20) to detect a measured quantity related to a height and / or a change in height of the stationary inductive charging device (20) relative to an underbody (37) of the vehicle (50) and to provide corresponding measurement data.
2. Inductive charging device (10, 20) according to claim 1, furthermore, with a positioning receiving device (12) having at least one receiving coil (13) for receiving positioning fields from the other inductive charging device and for providing information about the positioning fields.
3. Inductive charging device (10, 20) according to claim 2, wherein the one or more sensor devices (14) are designed separately from the positioning receiving device (12) and The inductive charging device (10, 20) has a control unit configured to perform a positioning procedure based on the received positioning fields, using threshold values based on the measurement data in the positioning procedure. 12.02.2026 35 4. Inductive charging device (10, 20) according to claim 2, furthermore with one or more flow guidance elements (16) around which the at least one receiving coil (13) of the positioning receiving device (12) is wound, wherein at least one of the one or more sensor devices (14) is arranged on one of the one or more flow guidance elements (16) or is arranged between at least two flow guidance elements (16).
5. Inductive charging device (10, 20) according to one of the preceding claims, furthermore with a carrier plate (18) for receiving the energy coil (11), wherein at least one of the one or more sensor devices (14) is arranged on the carrier plate (18) and / or wherein at least one of the one or more sensor devices (14) is arranged on the receiving coil (13), in particular on a circuit board (17) of the receiving coil (13).
6. Inductive charging device (10) according to one of the preceding claims, wherein the one or more sensor devices (14) comprise an ultrasonic sensor; a compensated or uncompensated coil, a radar sensor; an ultra-wideband sensor; a laser sensor, in particular a LiDAR sensor; a time-of-flight camera, and / or an optical distance sensor.
7. Inductive charging device (10, 20) according to one of the preceding claims, wherein the one or more sensor devices (14) are substantially made of a non-metallic material, and / or wherein the one or more sensor devices (14) are arranged at a distance from the energy coil.
8. Inductive charging device (10, 20) according to one of the preceding claims, wherein the one or more sensor devices (14) are centrally located in the main extension plane of the inductive charging device (10, 20) 12.02.2026 36 are arranged and / or are arranged in one or more corners of the inductive charging device (10, 20).
9. Inductive charging device (10, 20) according to claim 6, wherein the one or more sensor devices (14) are arranged separately and spaced apart from the inductive charging device (10, 20).
10. Device (100) for determining whether a reference point of a mobile inductive charging device (10) lies within a tolerance zone for the positioning of a mobile inductive charging device (10) of a vehicle (50) relative to a stationary inductive charging device (20), comprising a receiving unit (102) for receiving information about positioning fields of the mobile inductive charging device (10) or the stationary inductive charging device (20); an evaluation unit (104) for determining whether the reference point lies within the tolerance zone, based on the positioning fields and height-dependent threshold values, preferably determined by means of one or more sensor devices (14), and an output unit (106) for providing the information whether the reference point lies within the tolerance zone.
11. Device (100) according to claim 10, wherein the evaluation unit (104) is further configured to determine the position of the mobile inductive charging device (10) relative to the tolerance zone and the output unit (106) is further configured to output information about the position of the mobile inductive charging device (10) relative to the tolerance zone.
12. Method for determining the information whether a reference point of a mobile inductive charging device (10) is within a tolerance zone for the 12.02.2026 37 Positioning of a mobile inductive charging device (10) relative to a stationary inductive charging device (20) is, with Receiving information about positioning fields of the mobile inductive charging device (10) or the stationary inductive charging device (20); Determining threshold values based on height information, preferably determined by means of one or more sensor devices (14); Comparing the threshold values with information about the positioning fields and determining from this whether the reference point lies within the tolerance zone; Providing information on whether the reference point lies within the tolerance zone.
13. System (1) for determining whether a reference point of a mobile inductive charging device (10) lies within a tolerance zone for the positioning of a mobile inductive charging device (10) relative to a stationary inductive charging device (20), comprising a device (100) according to one of claims 10 or 11, and a display unit (200) for visual, auditory and / or haptic display of the information as to whether the reference point is within the tolerance zone.
14. System (1) according to claim 13, wherein the device (100) is a device according to claim 10 and the display unit (200) is further configured to indicate the position of the mobile inductive charging device (10) or the stationary inductive charging device (20) relative to the tolerance zone visually, audibly and / or haptically.
15. System (1) according to claim 13 or 14, furthermore with an inductive charging device (10) according to one of claims 1 to 9. 12.02.2026 38 16. Vehicle (50) with an inductive charging device (10) according to one of claims 1 to 9, in particular with a system (1) according to one of claims 13 to 15.