Method and device for assigning a first automobile to a second automobile

A method for assigning a first motor vehicle to a second motor vehicle by exchanging electromagnetic signals. The electromagnetic signals are transmitted from the first motor vehicle in a predetermined temporal signal pattern and received by the second motor vehicle, where they are compared as to whether the received electromagnetic signals correspond to a signal pattern stored in the second motor vehicle. The first motor vehicle then is assigned as a function of the comparison. This method is particularly suited to assigning trailers to a towing vehicle.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a method and a device for assigning a first motor vehicle to a second motor vehicle.

In order to exchange relevant data between two motor vehicles, e.g. a towing vehicle and its trailer, it is necessary for a clear assignment to take place between the two motor vehicles.

If other motor vehicles are in direct proximity when connection is established between a trailer and a towing vehicle, there is the risk that a signal connection, e.g. by means of a HF connection, is not established between the coupled motor vehicles.

A radio system is used for the connection between controllers in the towing vehicle and on the trailer. No user interaction is needed for acceptance while the connection is being established.

BRIEF SUMMARY OF THE INVENTION

The object underlying the present invention is thus to indicate a way in which a reliable signal connection is enabled between a motor vehicle and its trailer.

This object is achieved in accordance with the invention by a method with the features of claim1and a device with the features of claim6. Advantageous embodiments and developments, which can be used individually or in combination with one another, form the subject matter of the dependent claims.

In a first aspect of the invention, a method is proposed for assigning a first motor vehicle to a second motor vehicle by means of exchanging electromagnetic signals with the following method steps:transmitting electromagnetic signals from the first motor vehicle, with the electromagnetic signals being sent in a predetermined temporal signal pattern,receiving the electromagnetic signals transmitted from the first motor vehicle by means of the second motor vehicle,comparing in the second motor vehicle whether the received electromagnetic signals correspond to a signal pattern stored in the second motor vehicle,assigning the first motor vehicle as a function of the comparison.

In a preferred embodiment of the invention, an assignment of the first motor vehicle takes place, if the comparison produces a correspondence between the received signal pattern and a signal pattern stored in the second motor vehicle.

In a further preferred embodiment of the invention, an assignment of the first motor vehicle does not take place, if the comparison does not produce a correspondence between the received signal pattern and a signal pattern stored in the second motor vehicle.

The method according to the invention is expediently repeated if no assignment takes place.

It has proven worthwhile for a temporally non-periodic signal sequence to underlie the temporal signal pattern.

A precise temporal sequence, the so-called timing, is defined for the connection. This is used so that the precise time of coupling the trailer to the towing vehicle is only known to the two relevant motor vehicles. This herewith ensures that the connection can only be established between the two coupled motor vehicles.

During the connection establishment, one motor vehicle assumes the role of the server, which awaits the connection establishment and one motor vehicle assumes the role of the client, which initiates the connection establishment. If the two motor vehicles are coupled, the server allows the connection establishment for a specific time. The client attempts to set up the connection immediately after the coupling process.

A precise time pattern, which can only be maintained by the actual client, is now defined for the connection establishment from time0of the coupling process.

In a second aspect of the invention, a device is proposed for assigning an object to a motor vehicle by means of exchanging electromagnetic signals, with the deviceincluding a communication facility on the motor vehicle side, with which means are designed for receiving electromagnetic signals transmitted from the object in the form of a signal pattern, andincluding a control device on the motor vehicle side, to which the signal pattern can be fed, and with which means are designed in order to compare a stored signal pattern with the feedable signal pattern, with the object being assignable as a function of the comparison.

DESCRIPTION OF THE INVENTION

With the subsequent description of a preferred embodiment of the present invention, the same reference characters refer to identical or comparable components.

FIG. 1shows two motor vehicles1and2, which are to be clearly assigned to one another with the aid of electronic means. The respective communication receivers4,7for motor vehicle1,2control the signal exchange by means of electromagnetic signals3, typically high-frequency signals3. The communication receivers4,7are actuated accordingly by each control device6,9by way of a CAN bus5,8in each instance.

FIG. 2shows an exemplary signal pattern10of a temporal sequence of signals3, which is predetermined for the exchange between the motor vehicles1,2.

In the example of a coupling process between a trailer, e.g. the motor vehicle2and a towing vehicle, e.g. the motor vehicle1, the exchange of signals3for identifying the motor vehicle2from motor vehicle1is shown below. Starting from the coupling time0, based on a communication receiver4in the motor vehicle2, an antenna sends high-frequency signals3in the form of connection establishment messages at times1,2t,4t,5tand7tto the communication receiver7in motor vehicle1. The signals3, which the communication receiver7in the motor vehicle1has received, are subsequently forwarded to a control device9on the motor vehicle side. The communication between the control device6and the communication receiver4, as well as the control device9and the communication receiver7is usually carried out by way of a corresponding CAN bus5,8. The received signals3are analyzed in the control device9in respect of their temporal occurrence. If periodic connection establishment messages with the period t are now identified in motor vehicle1by a motor vehicle for instance, no assignment takes place since no signals3are expected at times3tand6tin the predetermined signal pattern10. If some messages of the coupled motor vehicle2get lost as a result of connection faults, an adequately reliable statement relating to the connection can still always be made on the basis of the received messages.

The connection establishment is then concluded successfully, if at time7t, for example, 3 messages were received synchronously, otherwise a new connection establishment is initiated in accordance with the same pattern.

With the application according to the invention, no user interaction (driver) is needed in order to establish the connection between the towing vehicle and trailer. This nevertheless ensures that the connection can only be established between the coupled motor vehicles and faulty connections can be ruled out.

With the definition of the timing, it is important for as minimal a correlation to other radio connections as possible to be ensured.

The design according to the invention allows a cost-effective and consequently reliable wireless assignment of a trailer to a towing vehicle.

Furthermore, no additional components are needed in the transmit/receive facilities.

The present invention is particularly suited to the assignment of trailers to a towing vehicle.