ULTRASONIC SYSTEM AND METHOD FOR DETERMINING THE LOCATION OF A DRIVER OF A VEHICLE

Abstract

An ultrasonic system for determining the location of a driver of a vehicle, includes a hand-held device with at least a first ultrasonic sensor, wherein the first ultrasonic sensor has at least one transmitter, and a motor vehicle having a multiplicity of second ultrasonic sensors, wherein the second ultrasonic sensors each have at least one receiver for receiving signals of the first ultrasonic sensor. A method is disclosed for determining the location of a driver of a vehicle.

Claims

1. An ultrasonic system for determining the location of a driver of a vehicle, comprising a hand-held device with at least a first ultrasonic sensor, wherein the first ultrasonic sensor has at least one transmitter, and a motor vehicle having a multiplicity of second ultrasonic sensors, wherein the second ultrasonic sensors each has at least one receiver for receiving signals of the first ultrasonic sensor.

2. The ultrasonic system according to claim 1, wherein the first ultrasonic sensor is exclusively configured as a sender/transmitter.

3. The ultrasonic system according to claim 1, wherein the first ultrasonic sensor is configured in such a manner that it a transmits a series of ultrasonic bursts after a known time code.

4. The ultrasonic system according to claim 3, wherein the second ultrasonic sensors are configured in such a manner that they receive signals from the first ultrasonic sensor when an operation for at least one of pulling into or pulling out of a parking space is activated.

5. The ultrasonic system according to claim 1, wherein the hand-held device is at least one of a car key, a key fob, a smartphone or a tablet.

6. The ultrasonic system according to claim 1, wherein at least three second ultrasonic sensors are provided and are configured to receive signals from the first ultrasonic sensor.

7. A method for determining the location of a driver of a vehicle, comprising: transmitting of ultrasonic signals by at least a first ultrasonic sensor which is arranged on a hand-held device, receiving ultrasonic signals by a multiplicity of second ultrasonic sensors arranged on a vehicle, processing the received ultrasonic signals determining a position of the hand-held device with respect to the vehicle based upon the processing.

8. The method according to claim 7, wherein the first ultrasonic sensor exclusively transmits ultrasonic signals.

9. The method according to claim 7, wherein the first ultrasonic sensor transmits a series of ultrasonic bursts after a known time code.

10. The method according to claim 7, wherein an operation of the vehicle for at least one of pulling into or out of a parking space is activated based upon the position of the hand-held device.

11. The method according to the claim 10, wherein the determination of the location of the driver of the vehicle takes place exclusively during the operation for pulling into or out of a parking space.

12. The method according to claim 10, wherein at least one of the first ultrasonic sensor does not transmit ultrasonic signals, the ultrasonic signals are not received by the second ultrasonic sensors, or the ultrasonic signal are not processed until after the operation for at least one of pulling into or pulling out of a parking space has been at least one of activated or recognized.

13. The method according to claim 10, wherein the operation for at least one of pulling into or pulling out of a parking space is interrupted as soon as it is established that a specific distance between the hand-held device and the vehicle has been exceeded.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Further advantageous configurations are set out in the drawings, wherein:

[0027] FIG. 1: shows a schematic representation of an ultrasonic system according to the invention in a configuration;

[0028] FIG. 2: shows a schematic flow chart of a method according to the invention in a configuration.

DETAILED DESCRIPTION

[0029] FIG. 1 shows a schematic representation of an ultrasonic system 10 according to the present disclosure for determining the location of a driver of a vehicle 12 in a configuration. The ultrasonic system 10 includes a hand-held device 14 with at least a first ultrasonic sensor 16, wherein the first ultrasonic sensor 16 has at least one transmitter. The hand-held device 14 can be a key fob, a smartphone and/or a tablet. It is advantageous if the first ultrasonic sensor 16 is exclusively configured as a sender/transmitter and can consequently only transmit ultrasonic signals, but cannot receive them. The first ultrasonic sensor 16 is configured in such a manner that it transmits a series of ultrasonic bursts after a known time code.

[0030] The ultrasonic system 10 further includes a motor vehicle 20 having a multiplicity of second ultrasonic sensors 22, wherein the second ultrasonic sensors 22 each has at least one receiver for receiving signals of the first ultrasonic sensor 16. The second ultrasonic sensors 22 are in particular configured in such a manner that they exclusively receive signals 18 of the first ultrasonic sensor 16 during an operation for pulling into and/or out of a parking space. If the sensors 22 have multiple receiver channels, in particular two receiver channels, then one channel can listen to the sensor 16 and the other channel can listen for other signals.

[0031] FIG. 2 shows a schematic flow chart of a method according to the present disclosure for determining the location of a driver of a vehicle 12 in a configuration. In a first step, ultrasonic signals 18 are transmitted (S1) by at least a first ultrasonic sensor 16 which is arranged on a hand-held device 14. In a second step, the ultrasonic signals are received (S2) by a multiplicity of second ultrasonic sensors 22 arranged on a vehicle 20. In a third step, the received ultrasonic signals are processed, as a result of which the position of the hand-held device 14 with respect to the vehicle 20 is determined.

[0032] If the ultrasonic signals transmitted by the first ultrasonic sensor are received by the second ultrasonic sensors which are located on the vehicle, the individual second ultrasonic sensors cannot in principle determine the radial distance from the hand-held device with the time of flight (ToF). The differences in the time of flight can, however, be utilized in order to estimate the location of the hand-held device by means of multilateration. With the aid of the time difference of arrival (TDOA) of the second ultrasonic sensors, hyperbolic curves can however preferably be drawn, the point of intersection of which corresponds to the location of the transmitter, that is to say of the first ultrasonic sensor.

[0033] It is possible to create an implementation of a time synchronization between the hand-held device or the first ultrasonic sensor and the vehicle or the second ultrasonic sensors via a radio channel (RF), e.g., Bluetooth or Wi-Fi. If the time synchronization between the hand-held device or the first ultrasonic sensor and the vehicle or second ultrasonic sensors is possible, then it is in principle sufficient to have sufficient ToF measurements from two second ultrasonic sensors. A trilateration is then used in order to determine the location of the hand-held device.

[0034] Further, it is in principle also possible to use second ultrasonic sensors which are able to directly estimate the angle of attack (AoA) of ultrasonic signals. If there is no temporal synchronization between the hand-held device and the vehicle, the AoA of at least two second ultrasonic sensors is in principle sufficient in order to determine the location of the hand-held device by means of triangulation. If a temporal synchronization is performed, then an ultrasonic sensor can in principle estimate the radial distance, for example by ToF, and the position, for example by the AoA with respect to the hand-held device.

[0035] It is advantageous if the second ultrasonic sensors have two receiver channels. They are configured such that they receive direct and cross-shaped echoes. When receiving direct echoes, the transmitter of the US pulse is preferably the same as the receiver. When receiving cross-shaped echoes, the transmitter of the impulse is a neighbor of the receiver. If the second ultrasonic sensors have two receiver channels, then they can in particular also still detect the surroundings during an operation for pulling into and/or out of a parking space.

[0036] The invention has been described above with reference to example embodiments. It is understood that numerous alterations and modifications are possible, without departing from the scope of protection defined by the claims. A combination of the various exemplary embodiments is also possible.

LIST OF REFERENCE NUMERALS

[0037] 10 Ultrasonic system [0038] 12 Driver of a vehicle [0039] 14 Hand-held device [0040] 16 First ultrasonic sensor [0041] 18 Ultrasonic signal [0042] 20 Motor vehicle [0043] 22 Second ultrasonic sensor [0044] S1-S3 Method steps