Method for operating an electrical charging device and driving recommendation for an electrically driveable motor vehicle and electric charging device and motor vehicle

Abstract

A method for operating an electric charging device for an electrically drivable motor vehicle. The electric charging device has a ground unit for positioning in the ground and for generating an alternating magnetic field for an electric charging operation. The method includes sensing a motor vehicle within a predefined perimeter surrounding the ground unit; sensing a driving parameter value of at least one driving parameter of the sensed motor vehicle at at least one respective predefinable point in time; storing the at least one driving parameter value if an electric charging operation is carried out for the detected motor vehicle; determining a driving recommendation on the basis of the at least one sensed and stored driving parameter value; and transmitting the driving recommendation if another motor vehicle is sensed within the predefined perimeter surrounding the ground unit.

Claims

1. A method for operating an electric charging device for an electrically drivable motor vehicle, comprising: (a) sensing a motor vehicle within a predefined perimeter surrounding a ground unit; (b) sensing, with a sensor system and at a plurality of respective time points, a plurality of driving parameter values, each of the plurality of driving parameter values corresponding to at least one driving parameter of the sensed motor vehicle; (c) storing, in a memory unit of the electric charging device, the plurality of driving parameter values as an approach trajectory if an electric charging operation is carried out for the sensed motor vehicle; (d) determining a driving recommendation based on the approach trajectories stored in the memory unit; and (e) transmitting the driving recommendation when another motor vehicle is sensed within the predefined perimeter surrounding the ground unit, wherein the electric charging device comprises the sensor system and a ground unit for positioning the electric charging device in a surface and for generating an alternating magnetic field for the electric charging operation, and wherein the sensor system comprises a charging coil of the ground unit.

2. The method according to claim 1, wherein the driving recommendation is determined in view of a predefined criterion, the predefined criterion comprising an elapsed time between sensing of a respective motor vehicle and initiation of the electric charging operation of the respective motor vehicle.

3. The method according to claim 1, wherein two or more of the approach trajectories are averaged together to form the driving recommendation.

4. The method according to claim 1, wherein a radius of the predefined perimeter is greater than two meters.

5. The method according to claim 1, wherein the at least one driving parameter comprises at least one of: a driving speed, a steering angle, an acceleration, a braking, a driving direction of the respective motor vehicle, and/or a position of a respective motor vehicle relative to the ground unit.

6. The method according to claim 1, wherein the sensor system is decoupled from any sensors provided on the motor vehicle.

7. The method according to claim 1, wherein the motor vehicle is sensed based on at least one of a strength and an alignment of an electromagnetic field detected by the charging coil.

8. An electric charging device for an electrically drivable motor vehicle, comprising: a sensor system, a ground unit for positioning the electric charging device in a surface and for generating an alternating magnetic field for an electric charging operation, a memory unit, and a processor unit, wherein the sensor system is configured to sense a motor vehicle within a predefined perimeter surrounding the ground unit, wherein the sensor system is further configured to, at a plurality of respective time points, sense a plurality of driving parameter values, each of the plurality of driving parameter values corresponding to at least one driving parameter of the sensed motor vehicle, wherein the electric charging device is configured to detect the electric charging operation for the sensed motor vehicle, wherein, when the electric charging operation is detected, the plurality of driving parameter values are stored in the memory unit as an approach trajectory, wherein the processor unit is configured to determine a driving recommendation based on the approach trajectories stored in the memory unit, wherein the electric charging device is configured to transmit the driving recommendation when another motor vehicle is sensed within the predefined perimeter surrounding the ground unit, and wherein the sensor system comprises a charging coil of the ground unit.

9. A motor vehicle configured to receive the driving recommendation from the electric charging device according to claim 8, the motor vehicle comprising: an electric power storage device configured to be charged by the electric charging device, and a display device for displaying the driving recommendation.

10. The electric charging device according to claim 8, wherein two or more of the approach trajectories are averaged together to form the driving recommendation.

11. The electric charging device according to claim 8, wherein the sensor system is decoupled from any sensors provided on the motor vehicle.

12. The electric charging device according to claim 8, wherein the motor vehicle is sensed based on at least one of a strength and an alignment of an electromagnetic field detected by the charging coil.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Exemplary embodiments of the disclosure will be described below. In reference to these embodiments:

(2) FIG. 1 shows a diagram depicting the method steps in a method for operating an electric charging device for an electrically drivable motor vehicle;

(3) FIG. 2 shows a schematic depiction of a motor vehicle within a perimeter surrounding an electric charging device and an approach trajectory.

DETAILED DESCRIPTION

(4) The exemplary embodiments described in the following are preferred embodiments of the disclosure. In the exemplary embodiments, the described components of the embodiments are each individual features of the disclosure that are to be considered independently of one another, and also each refine the disclosure independently of one another and for that reason as well should be regarded individually or in a combination other than the one shown as part of the disclosure. The described embodiments can also be supplemented by other features of the disclosure that have already been described.

(5) In the figures, elements having the same function are provided in each case with the same reference symbols.

(6) FIG. 1 shows a schematic diagram outlining the method steps for a method for operating an electric charging device for an electrically drivable motor vehicle. FIG. 2 shows a schematic depiction of a motor vehicle within a perimeter surrounding the electric charging device, along with an approach trajectory. In the following, the two figures will be discussed in detail together.

(7) The electric charging device, which is not shown in the figures, comprises a ground unit 10, which is set into the ground, for example, and which comprises an inductive charging coil. A charging coil of a motor vehicle 12 in the immediate vicinity of the inductive charging coil can then charge the electrically drivable motor vehicle 12 in an inductive charging operation via an alternating electromagnetic field generated in the charging coils. For this purpose, the two charging coils must be positioned correctly one above the other and must not be spaced too far apart, so that the efficiency of the inductive charging operation will remain efficient.

(8) Since a correct positioning of the motor vehicle 12 above the ground unit 10 with the charging coil may be dependent on only a few centimeters, driving the motor vehicle 12 onto the ground unit 10 is especially difficult. The electric charging device provides assistance with this by transmitting a driving recommendation with a recommended approach trajectory 14 to the motor vehicle 12. To determine the driving recommendation, in a first method step Sa a first motor vehicle 12 is sensed within a predefined perimeter 16 surrounding the ground unit 10 by the electric charging device. The predefined perimeter 16 extends in a radius of 5 to 8 meters around the ground unit 10, for example, and is depicted by way of example in FIG. 2. The motor vehicle 12 can be detected as soon as it crosses the predefined perimeter 16.

(9) In a second method step Sb, the electric charging device senses a travel path of the motor vehicle 12, for example by means of suitable sensors. The travel path can be described, for example, by a series of driving parameters, each of which attains a driving parameter value measured by the electric charging device. For instance, the electric charging device can sense individually a driving speed of the motor vehicle 12, a steering angle of the motor vehicle 12, a driving direction of the motor vehicle 12, and/or a position of the motor vehicle 12 relative to the ground unit 10. These sensed driving parameters can then be combined to form an approach trajectory 14.

(10) If the electric charging device detects that an electric charging operation is being carried out for the sensed motor vehicle 12, the sensed driving parameters and/or the approach trajectory 14 determined therefrom are stored in a memory of the electric charging device in a third method step Sc.

(11) Method steps Sa, Sb, and Sc are repeated for each additional motor vehicle 12 detected within the predefined perimeter 16 surrounding the ground unit 10 by the electric charging device. Thus, a plurality of driving parameters and/or approach trajectories 14 traveled by the respective motor vehicles 12 from the predefined perimeter 16 to the ground unit 10 accumulate in the memory of the electric charging device.

(12) In a fourth method step Sd, the electric charging device determines a driving recommendation with an ideal approach trajectory 14 to be recommended, on the basis of the approach trajectories 14 stored in the memory. For this purpose, each sensed approach trajectory 14 of the individual motor vehicles 12 can be evaluated, so that the ideal approach trajectory 14 to be recommended is determined only from those approach trajectories 14 that are rated as good. An approach trajectory 14 is rated as good, for example, if the motor vehicle 12 is driven particularly rapidly and/or in less than a predefined maximum time interval from a starting position within the perimeter 16 surrounding the ground unit 10 to a correctly positioned end position above the ground unit 10.

(13) When another motor vehicle 12 is sensed within the perimeter 16 surrounding the ground unit 10 of the electric charging device, the electric charging device transmits the determined driving recommendation with the ideal approach trajectory 14 to be recommended in a fifth method step Se. The ideal approach trajectory 14 can also adapt to an approach route 18 of the motor vehicle 12 that has already begun, so that the recommended approach trajectory 14 has as its starting point the current position of the motor vehicle 12.

(14) In the motor vehicle 12, the recommended approach trajectory 14 can be displayed dynamically on a screen, for example in the way in which a route is displayed in a navigation system. This allows the driver of the motor vehicle 12 to follow the recommended approach trajectory 14 and position himself correctly above the charging coil in the ground unit 10.

(15) The examples taken together demonstrate how the disclosure can be used to operate an electric charging device to issue a recommendation to a motor vehicle of the best way to drive up to the electric charging device to ensure an efficient electric charging operation for the motor vehicle.