WO2015039797A1

WO2015039797A1 - Positioning system for vehicles comprising an electric drive and an inductive charging system

Info

Publication number: WO2015039797A1
Application number: PCT/EP2014/066705
Authority: WO
Inventors: Faical Turki; André Körner; Daniel Siekmann
Original assignee: Paul Vahle Gmbh & Co. Kg
Priority date: 2013-09-18
Filing date: 2014-08-04
Publication date: 2015-03-26
Also published as: DE102013110280A1

Abstract

The invention relates to a positioning system for a vehicle (1) which can be charged by means of an inductive energy transfer system (2, 4). On the vehicle (1) end, a secondary-side energy transfer device (2), and on the station end, a primary-side energy transfer device (4), particularly in the form of a charging point (4), are arranged and have to be brought in position relative to each other for charging the vehicle (1), additional coils and/or antennas being arranged on the station end and/or on the vehicle (1) end. The invention is characterized in that: either at least one additional primary-side coil and/or antenna forms at least one primary-side transmitter, and at least one additional coil and/or antenna arranged on the vehicle forms at least one receiver for receiving the signals of the at least one primary-side transmitter; and/or at least one coil and/or antenna is additionally arranged on the vehicle and forms at least one secondary-side transmitter, and on the primary side at least one additional coil and/or antenna forms at least one receiver for receiving the signals of the at least one transmitter arranged on the vehicle, at least two receivers and/or at least two transmitters being present; and the positioning system determines, by means of the signals transmitted by the additional coils and/or antennas, the relative distance (V_Ab) and/or orientation (F_R) of the vehicle (1) relative to the primary-side energy transfer device (4) on the station end.

Description

POSITION DETERMINATION SYSTEM FOR VEHICLES WITH ELECTRIC DRIVE AND INDUCTIVE CHARGING

The present invention relates to a position determining system for a vehicle (1) which can be charged by means of an inductive energy transmission system (2, 4), wherein on the vehicle (1) a secondary-side energy transmission device (2) and stationary primary energy transfer device (4), in particular in shape a charging point (4) are arranged, which must be brought into position for charging the vehicle (1) relative to each other, wherein stationary and / or on the vehicle (1) additional coils and / or antennas are arranged.

Vehicles that are charged by means of inductive energy transmission systems, ie wireless, have a pickup, which must be positioned relative to a stationarily arranged side energy transfer device, so that an inductive energy transfer with good efficiency is possible. It is thus known that the primary-side energy transmission device, which has at least one coil on the primary side, is adjusted to a parked vehicle by means of actuators and brought into position. It is also known that the pickup is lowered from the vehicle and thus approximated to the device on the primary side, so that the smallest possible air gap results between the primary-side and the secondary-side device.

Furthermore, positioning aids are known which optically and / or acoustically indicate to the driver and how he can reach the optimum position or when he has reached it. These positioning aids usually use in addition to the vehicle or stationarily arranged transmitter and receiver. WO 2011/116874 describes a system for contactless energy transmission to a vehicle, in which additional coils are arranged on the vehicle and / or stationary around the respective charging coils, with which the magnetic field of the energy transmission coils can be detected, whereby a position determination of the vehicle relative to the primary side Charging point of the power transmission system is possible. A disadvantage of this system, the complicated structure and the fact that the vehicle must already be in close proximity to the charging point, so that a position determination is sufficiently accurate feasible.

Object of the present invention is to provide a simple in its construction position determination system.

This object is inventively achieved with a positioning system having the features of claim 1. Advantageous embodiments of the positioning system according to claim 1 result from the features of the subclaims.

The relative positioning of the vehicle over an inductive stationary charging point must be in the centimeter range, so that an efficient energy transfer can take place. The positioning system according to the invention can be used to display the current position of the vehicle or the secondary charging unit (pickup) relative to the charging point and thus helps the driver to bring the vehicle to its destination position. Also, the data of the position determination system can be used for an automatic parking assistant, which helps the vehicle park as optimally as possible to stationary energy transmission device or the charging point or automatically parked. In this case, the positioning device can advantageously use already arranged on the vehicle transmitter and / or receiver of the keyless entry and start system, which preferably uses magnetic or electromagnetic sensors.

If only one transmitter and at least two receivers are used, the transmitter in a first embodiment of the invention may be stationary, in particular in the immediate vicinity of the primary-side charging point of the energy transmission system, or in a second embodiment of the invention on the vehicle to be ordered. In the first embodiment of the invention then the receivers on the vehicle and in the second embodiment must be arranged stationary. The receivers should be positioned as far apart as possible so that a good resolution can be achieved for the positioning system. The same applies if only one receiver and several transmitters are provided.

Thus, the receiver or transmitter arranged on the vehicle can be arranged as possible on the two longitudinal sides of the vehicle, in particular in the doors, door handles, the door sills, on the vehicle floor or on the tailgate or the tailgate handle.

Of course, it is also possible that the position determination system has at least two transmitters and at least two receivers, which are each arranged on the stationary side and on the vehicle.

For existing access and start systems, which are usually also called keyless entry systems, such. As the system KESSY® from Hella, transmission coils are arranged on the vehicle, usually in the vicinity of the door handle or in the door handle. It is also possible to arrange the transmitting coils in the area of the Türschweiler or on the underbody. Also, both in the door handle and in the Türschweiler and / or on the underbody relatively close to the sides of the vehicle, the transmission coils are arranged. If the positioning system knows the distance between the transmitter coils arranged on the vehicle, it can determine the distance and the relative orientation of the vehicle or its pickup to the charging point on the basis of the signal strengths and / or propagation time differences of the signals measured at the charging point. This data may be provided by the vehicle for additional functions, e.g. B. for the automatic parking of the vehicle. Since the transmission coils of the keyless entry systems are approximately 1.5 m apart due to the vehicle width, well-ascertainable differences in the signal strengths and / or signal propagation times of the signals emitted by the transmission coils of the keyless entry system result.

Of course, it is possible that the arranged on the vehicle coils of the keyless entry system are used as receiving coils, which Receive signals from a stationarily arranged transmitter. In this embodiment too, the determined differences in the measured signal strengths or signal propagation times for determining the position or the relative position of the stationary charging point and the secondary pickup can be used. In this case, the transmitter of the positioning system is stationary and the evaluation of the positioning device arranged on the vehicle.

If the receiver determining the signal propagation time differences and / or signal strength differences is arranged stationarily, the position determination system can be arranged completely stationary, whereby different data can be displayed to the driver by means of a display arranged on the stationary side and / or in the vehicle. If an advertisement is arranged in the vehicle, the position data must be transmitted to the vehicle. If the data of the positioning system are to serve an automatic parking assistant, they must also be transmitted to the vehicle.

In any case, the positioning system must have knowledge of the type of vehicle, the arrangement of the pickup on the vehicle and the relative position of the transmitter and / or receiver of the access and start system, so that from the signal data at least the distance of the vehicle to the charging point can be calculated. So it is within the meaning of the invention, when the data is entered once in the positioning device. However, it is also within the meaning of the invention, when the required data is transmitted from the vehicle to the positioning system, if it is not arranged in the vehicle. The positioning system can also access a database or store it in a memory of the system, the corresponding data for the respective vehicle type being stored in the database, and the vehicle merely transmitting its vehicle type to the positioning system as it approaches the charging point. The data can be transmitted via the access and start system, a separate communication system or via the data transmission interface of the inductive energy transmission system. Two possible embodiments of the invention will be explained in more detail with reference to drawings.

Show it :

Fig. 1: Positioning system with a stationary arranged

Transmitter whose signal is received by the receiver coils of the vehicle's access and start system;

Fig. 2: Positioning system with a stationary arranged

A receiver receiving the signals transmitted by the transmitting coils of the vehicle's access and start system.

FIG. 1 shows a first possible embodiment of the position determination system according to the invention in which a stationary transmitter 5c is arranged whose signal S is received by the receiving coils 3a, 3b, z. B. the access and start system, the vehicle 1 are received. Due to the different distances A _a and A _b between the transmitter 5c and the receiving coils 3a, 3b determine these different signal strengths. On the basis of the determined signal strengths, the system according to the invention can determine the distance V _ab between the charging point 4 and the vehicle-side pickup 2. Most of the orientation F _{R of} the vehicle 1 by the parking situation, z. As in a garage, predetermined, so that the only of two receiving coils 3a, 3b detected data sufficient to the driver commands, z. B. arranged on a stationary side display 8, for the exact positioning of the vehicle relative to the charging point 4 to grant. The display can of course also be arranged in the vehicle as an alternative. It is also possible that the commands acoustically, z. B. by voice.

On the display 8, the driver can be displayed in which direction he has to drive and how far he is still away from the optimal parking position.

It is of course possible that the position determination system according to the invention vehicle data, such as vehicle speed, - acceleration, steering angle, etc., in the calculation of the output data used by the system. FIG. 2 shows a position determination system in which the transmitting coils 3a, 3b, for example those of the vehicle-side access and starting system, emit signals S _a and S _b which are received and evaluated by the receiver 3c arranged on the stationary side. The signals received by the receiver 3c are evaluated and evaluated by the evaluation unit of the position-determining system arranged either on the stationary side or transmitted to the position-determining system arranged in the vehicle 1.

Of course, it is also possible to use two transmitters and two receivers, which would allow the system to accurately determine the position and orientation of the vehicle in space, solely on the basis of the measurement at a time.

Claims

Patent claims

Position determination system for a vehicle (1), which can be charged by means of an inductive energy transmission system (2, 4), with a secondary energy transmission device on the vehicle (1).

(2) and stationary a primary-side energy transmission device (4), in particular in the form of a charging point (4), which must be brought into position relative to one another in order to charge the vehicle (1), being stationary and/or on the vehicle (1) additional coils and/or antennas are arranged, characterized in that

- either at least one additional primary-side coil and / or antenna forms at least one primary-side transmitter (3c), and that at least one additional coil and / or antenna arranged on the vehicle forms at least one receiver (5a, 5b) for receiving the signals from the at least one primary-side transmitter (3c) forms, and/or

- At least one coil and/or antenna is additionally arranged on the vehicle (1), which forms at least one secondary-side transmitter (3a, 3b), and at least one additional coil and/or antenna on the primary side has at least one receiver (5c) for receiving the signals of the at least one transmitter (3a, 3b) arranged on the vehicle (1),

wherein at least two receivers (5a, 5b) and/or at least two transmitters (3a, 3b) are present, and that the position determination system uses the transmitted signals (S) of the at least one transmitter (3a, 3b, 3c) to determine the relative distance (V _Ab ) and / or the orientation (F _R ) of the vehicle (1) relative to the stationary primary-side energy transmission device (4) is determined.

Position determination system according to claim 1, characterized in that the position determination system based on the different transit times and / or signal strengths from the at least one transmitter (3a, 3b, 3c) emitted signals (S), which are received or detected by the at least ^one receiver (5a, 5b, 5c), the relative distance (V _A b) and / or the alignment (FR ) of the vehicle (1) is determined ^relative to the stationary primary-side energy transfer device (4).

3. Position determination system according to claim 1 or 2, characterized in that the position determination system has a stationary and / or vehicle-side display device (8), which shows the relative distance (V _Ab ) and / or the orientation (F _R ) of the vehicle (1 ) ^relative to the primary-side energy transmission device (4) and/or the distance still to be covered by the vehicle and/or the direction toward the stationary primary-side energy transmission device (4).

4. Position determination system according to one of claims 1 to 3, characterized in that the position determination system has a data processing unit (CPU) either on the stationary side and / or on or on the vehicle ( 1 ).

5. Position determination system according to one of the preceding claims, characterized in that the position determination system uses the coils and / or antennas of an access and starting system, in particular a keyless entry system, as the at least one transmitter (3a, 3b, 3c) and / or the at least one receiver (5a, 5b, 5c) is used.

6. Position determination system according to one of the preceding claims, characterized in that at least one transmitter (3c) arranged on the stationary side emits radio signals (S), i.e. by means of at least two coils and / or antennas (5a, 5b) arranged on the vehicle, which in particular are arranged on both sides of the vehicle (1), can be ^received or can be received.

7. Position determination system according to one of claims 1 to 5, characterized in that at least two on the vehicle (1) arranged Transmitters (3a, 3b) emit radio signals (S _a , S _b ) which can be received or are received by means of at least one coil and/or antenna (3c) arranged on the stationary side.

8. Position determination system according to claim 7, characterized in that the at least one coil and / or antenna (3c) arranged on the stationary side is arranged in or on the primary-side energy transmission device (4) or is integrated into it and forms at least one transmitter and / or receiver.

9. Position determination system according to one of the preceding claims, characterized in that the position determination system arranged on the stationary side transmits the determined data to the vehicle (1), in particular by means of contactless data transmission, particularly preferably by means of the data transmission device of the access and starting system or the energy transmission system.

10. Position determination system according to one of the preceding claims, characterized in that the vehicle (1) positions itself or parks itself automatically based on the data determined by the position determination system to the stationary energy transmission device (4) in such a way that energy transmission, in particular with optimal efficiency, can take place or he follows.

11. Position determination system according to one of the preceding claims, characterized in that the position determination system has at least two receivers (5a, 5b, 5c) and at least two transmitters (3a, 3b, 3c).

12. Position determination system according to one of the preceding claims, characterized in that the coil (s) forming a transmitter or a receiver is arranged in the side of the vehicle, in the door handle, in the door sill, on the vehicle floor, on the tailgate or in the tailgate handle.