EP2200877A1

EP2200877A1 - Anti-theft system for a vehicle, and method for the operation of an anti-theft system

Info

Publication number: EP2200877A1
Application number: EP08804380A
Authority: EP
Inventors: Thomas Georgi; Roland Wagner
Original assignee: Continental Automotive GmbH
Current assignee: Continental Automotive GmbH
Priority date: 2007-09-18
Filing date: 2008-09-18
Publication date: 2010-06-30
Also published as: DE102007044398A1; JP2010538913A; US8150563B2; US20100217457A1; WO2009037312A1; JP5175353B2; DE102007044398B4

Abstract

Disclosed is an anti-theft system, especially in the form of an access and/or starting system for a vehicle (FZ). Said anti-theft system comprises a vehicle-mounted receiver (K1, E1; K2, E2) for receiving a request signal (AFS) containing the instruction to find out whether objects that are associated with the vehicle, e.g. lost identifiers (IDG1, IDG2), are located in one or more specific areas (SBA1, SBA2, SBI1, SBI2) of the vehicle. The anti-theft system further comprises a vehicle-mounted control and evaluation unit (STAE) for verifying whether the objects are in said one or more specific areas of the vehicle and outputting information on whether an object that is associated with the vehicle has been found. The anti-theft system finally comprises a vehicle-mounted transmitter (K1, S1; K2, S2) for transmitting a result signal (EGS) containing the information on whether objects have been found. Such an anti-theft system allows an identifier (IDG3), for example, which is associated with a user, to start a search from a distance in order to verify whether certain objects that are associated with the vehicle are located near or inside the vehicle.

Description

description

Anti-theft system for a vehicle and method of operating an anti-theft system

The present invention relates to an anti-theft system, in particular in the form of an access and / or start system of a vehicle, as well as a method for operating such a protection system. In this case, the purpose of the theft protection system, in addition to its main task of preventing theft of the vehicle or of objects located therein, is to locate objects associated with the vehicle in a specific area inside and / or outside the vehicle.

In order to prevent unauthorized access to a vehicle, modern access systems in vehicles use electronic security systems in which to authenticate a user, data communication between a first communication device of the user

(a portable user identification device or identification transmitter, such as a key or key fob) and a second communication device of the vehicle takes place. If authentication has taken place, a locking system of the vehicle is instructed to release the locking of any or all vehicle doors.

In so-called active access systems authentication is initiated by a user presses a particular provided for the unlocking of the vehicle button of his identification transmitter, which then sends an unlocking signal to the vehicle in the function of a remote control. In passive access systems and methods, an authentication code is initiated, for example, by touching integrated proximity or locking sensors in a door handle of the vehicle, the vehicle sending a code request signal to the identification transmitter in response to the touch, which eventually ends upon receipt of the Request signal sends a response signal with the corresponding authentication code back to the vehicle. In the vehicle, an examination of the received code can then take place and, in the case of a positive or successful test, as already mentioned above, the locking of the vehicle or of the vehicle doors can be canceled. It is also possible that an identification transmitter, for example in the form of an electronic key, is designed for both an active and a passive access method.

Similar to a passive entry system, code information can be transmitted from the identification device to the vehicle in a start system of the vehicle through a dialogue consisting of request signal from the vehicle and corresponding response signal from the identification device, for example deactivating an immobilizer or starting a drive motor of the vehicle Allow vehicle.

In addition to the actual "short-range" application of gaining access to or starting the drive motor of a nearby vehicle, there are also plans for longer range ("long range" applications) applications involving user identification devices, such as Key of a vehicle can communicate over long distances with the vehicle. Modern access or start systems are also designed to typically include a plurality of user identification devices or keys that provide access to the vehicle or start the drive motor of the vehicle. It may happen that, for example, two persons have driven in a vehicle, both of which carry a key associated with the vehicle access system. If the vehicle is turned off, and the two people leave the vehicle, for example, one of the

If the key is lost in the vehicle or outside the vehicle, this lost key poses a safety risk since it can be used by unauthorized persons Obtaining access to the vehicle or to start the drive motor can be used. Especially when the key slips into badly visible pockets, for example, a side door of the vehicle or in the event of loss outside the vehicle under a pile of dirt or

Foliage device, it is very difficult to notice the disappearance of the user identification device and later finding. The key is then usually considered lost.

Thus, the object of the present invention is to provide a way to minimize the loss of objects associated with the vehicle.

This object is solved by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims.

According to a first aspect of the invention, a method is provided for operating an anti-theft system, in particular in the form of an access and / or starting system for a vehicle. In this case, a portable identification transmitter assigned to the vehicle or the anti-theft system in the function of a remote control is designed to send out a request signal with the instruction to determine the presence of objects assigned to the vehicle in a specific area in and / or outside the vehicle. Further, an on-vehicle portion of the antitheft system is configured to perform the following steps. It receives the prompts signal and, in response to the prompts signal, verifies the presence of the objects in and / or outside the vehicle. Finally, the vehicle-mounted part of the anti-theft system after verification sends a result signal with information as to whether or not objects associated with the vehicle (or even the anti-theft system) have been found in the presence check. Due to the possibility of removing the vehicle-side part of the anti-theft system by means of prompting a request signal to search for objects associated with the vehicle and notifying a result of the search provides an easy and convenient way to retrieve near the vehicle or in the vehicle lost objects. Thus, the risk of total loss of these objects is minimized. In particular, the described method also creates a further field of application for an anti-theft system, in particular an access system with a long range, since a request signal also comes from a distance away from the vehicle

Location (in which the vehicle is no longer in sight, for example) can be sent to search for objects associated with the vehicle. For example, a user no longer needs to go directly to the vehicle to search for objects associated with the vehicle, but can do so conveniently, for example, by sending the prompt signal from his home.

According to one embodiment of the invention, the checking of the presence of the objects associated with the vehicle takes place in that a request signal is sent to the vehicle interior and / or the vehicle exterior from the vehicle-side part of the theft protection system. Subsequently, the vehicle-side part of the anti-theft protection system checks whether a response signal of an object is received. Advantageously, the request signal is a radio signal, in particular in the low-frequency range or LF (low frequency) range, for example with a frequency of 125 kHz. By contrast, the response signal can be a radio signal, in particular in the radio frequency range or RF (radio

Frequency) range, for example, with a frequency of 433 MHz act. Thus, to find objects, a similar method as for a conventional passive access system with a corresponding question-answer dialogue can be used. By using the same or similar algorithms as in an authentication in an access system for the search of objects no additional process or device-technical effort is required. It should be noted that in the response signal of an object, an identifier can be contained, which provides information about which object is concerned, from which the response signal originates.

According to a further embodiment, the request signal is emitted by the portable or user-side carry-along identification transmitter associated with the vehicle or the theft protection system, which is embodied, for example, in the form of an electronic key. The identification transmitter - also referred to as user identification device - basically has the purpose of communicating with the vehicle-side part of the anti-theft system in order to authenticate itself to the vehicle-side part. In the case of successful authentication, unlocking or locking of the vehicle or its doors is finally effected within the framework of an access system, while the drive motor of the vehicle can be activated on successful authentication in the context of a start system. It is conceivable that the portable identification transmitter has a long-range functionality and thus enables the associated user to arrange the vehicle from a greater range, for example from one or two kilometers away, by emitting the request signal for assigned objects to look nearby. Accordingly, the identification transmitter may receive the result signal to output the contained information regarding found objects to the user. For this purpose, the identification transmitter can output an optical, acoustic and / or mechanical signal (for example a vibration) to the user. It should also be noted that it is further possible that the identification transmitter sends along with the request signal an identifier or an authentication code, so that the vehicle recognizes that an authorized identification transmitter wants to initiate the search for objects.

It may be in the objects assigned to the vehicle which the vehicle-side part of the theft-proofing system can search near the vehicle (inside or outside the vehicle) be more to the vehicle associated with identification transmitter or other connected to a communication device items. Such communication devices may include a transceiver, such as an RFID (Radio Frequency Identification) transponder. The vehicle-side part of the anti-theft system then serves as a type of reading device for the RFID transponder of an object.

According to an advantageous embodiment, a resolution of the one or more places is to be created, where the vehicle associated objects can be found. For this purpose, the vehicle-side part of the anti-theft system may comprise a plurality of antennas, which are attachable to different positions of the vehicle and thus can cover various specific areas in and / or outside of the vehicle by radio technology. In this case, one or more request signals with a predetermined field strength can be emitted by the respective antennas, in which case objects located in the reception area of the respective antenna respond in response to a request signal. For example, the respective antennas may transmit their request signals at different times so that it is possible to detect from the vehicle-side part of the anti-theft system which request signal received a response signal within a specific time interval and thus to the antenna sending the request signal and finally to the location and the position (Receiving range of the antenna) of the responding object can be closed. It is also conceivable that one or more antennas emit a plurality of request signals with different field strength. If no object responds to the request signal for a first request signal with a low field strength, this means that the object is not in the immediate vicinity of an antenna. However, if the field strength of a second request signal is increased, and then an object responds, it is now possible to reference the range of the antenna to an approximate distance of the object to be searched are closed by the antenna emitting the second request signal.

According to a further aspect of the invention, a theft protection system is provided, in particular in the form of an access and / or starting system for a vehicle. The anti-theft system has a vehicle-side part comprising a vehicle-side receiving device for receiving a request signal with the instruction to determine the presence of objects associated with the vehicle in one or more specific areas of the vehicle. Furthermore, the vehicle-side part comprises a vehicle-side control and evaluation device for checking the presence of the objects in the one or more specific areas of the vehicle and for outputting an information, whether or not

Vehicle assigned object was found. Finally, the vehicle-side part has a vehicle-side transmitting device for emitting a result signal with the information about finding objects. Thus, in addition to its actual function of preventing theft protection of the vehicle, the thief steel protection system also enables another function, namely the locating of certain objects in the vicinity of the vehicle. In particular, the triggering of the search for objects by a request signal, which can be sent, for example, from an off-vehicle device from a certain distance to the vehicle, allows a user to conveniently start the search without directly approaching or approaching the vehicle to have to. Thus, the loss or total loss of certain objects that have been lost in the vicinity of the vehicle can be minimized.

According to one embodiment, for checking the presence of objects assigned to the vehicle, the vehicle-side control and evaluation device can cause the vehicle-side transmitting device to emit at least one request signal into the one or more specific areas of the vehicle, wherein the vehicle-mounted control and evaluation device in response to the receipt of a respective response signal of an object via the receiving device detects the presence of the response signal transmitting object. In particular, this check of the presence is radio-based, whereby, for example, a request signal in the low-frequency range (for example 125 kHz) and a corresponding response signal in the high-frequency range (for example 433 MHz) can be transmitted. Such an operation is similar to the operation of the anti-theft system in the context of an access system, in which the authentication of a user assigned to an identification transmitter by means of a similar question-answer dialog.

An anti-theft system for a vehicle may also include, in addition to the vehicle-mounted part, usually one or more portable identification transmitters associated with or carried by one or more users. By communicating a portable identification transmitter with the vehicle-side part of the anti-theft system, or more precisely by authenticating it, in the case of positive authentication in the context of an access system, it is possible for the vehicle or its doors to be unlocked, while in the case of positive authentication Authentication of an identification transmitter in the context of a start system is possible that the drive motor of the vehicle is activated. According to one embodiment of the invention, portable identification encoders, for example in the form of an electronic key, in addition to their actual function for unlocking / locking a vehicle or for activating a drive motor that has just been explained, can also be configured to receive the request signal (for example in the form of a Radio signal) to the vehicle-mounted portion of the anti-theft system to cause it to search for nearby vehicles (within and around the vehicle). Accordingly, a portable identification transmitter may be further configured to receive the result signal transmitted from the vehicle-side part, and its content or the information about finding objects to a user output. For this purpose, the identification transmitter can have one or more output devices for outputting optical, acoustic and / or mechanical signals. For example, an output device may comprise a display device in which, for example, in the case of an LCD (Liquid Crystal Display) display, a particular symbol or a corresponding text message "an object found" is output if one or more objects were found one or more

LEDs (LED: light-emitting diode), wherein e.g. a (specific) LED flashes when one or more objects have been found near the vehicle. It is also possible for an output device to comprise a loudspeaker which outputs a specific tone sequence in the case of found objects. Finally, an output device may comprise a vibration device which then outputs a specific vibration pattern when one or more objects have been found near the vehicle.

According to a further embodiment, a resolution of the location can be achieved at which a particular object is located near the vehicle. According to one possibility, the vehicle-side transmitting device comprises a plurality of antennas which can be attached to different positions of the vehicle. In this case, the vehicle-side transmitting device can emit one or more request signals (with a certain field strength) via the antennas, wherein finally a response signal can be received by the vehicle-side receiving device from an object located in a receiving region of a respective antenna. In particular, the vehicle-side transmitting device can control the respective antennas with a time offset, so that in response within a certain time interval after sending a specific request signal to the receiving range of the antenna can be inferred, in which the responding object is located, and thus a spatial resolution is enabled , It is also conceivable that the vehicle-side transmitting device has an antenna (or a plurality of antennas), which drives it with a plurality of request signals with different field strength. By emitting a plurality of request signals with different field strengths, the reception range for objects around the antenna can thus be varied and thus the approximate position of an object around the antenna can be determined, if no response signal is received on certain request signals with a certain field strength, while in others Request signals with, for example, higher field strength, a response signal from the vehicle-side receiving device is obtained.

In the following, exemplary embodiments of the present invention with reference to the accompanying drawings will now be explained in more detail. It shows:

Figure 1 is a schematic representation of a vehicle with an anti-theft system, in the vicinity

Identification transmitter to be found on the vehicle side of the anti-theft system.

Reference is now made to Figure 1, in which the schematic

Structure of a vehicle FZ with an anti-theft system is shown. The vehicle-side part of the anti-theft system has a vehicle-side control and evaluation device STAE as a central unit. To implement a radio-based access system, this control and evaluation device STAE is connected to two communication devices K1 and K2, which comprise respective transmission devices S1 or S2 and reception devices E1 and E2. To realize a good radio coverage, but also to realize a spatial resolution of communicating with the communication devices Kl and K2 objects, the communication device Kl has a provided in the front area of the vehicle outside antenna AlA and has an in the front Interior indoor antenna All. Correspondingly, the second communication device K2 has an external antenna A2A at the rear vehicle exterior, and has an interior antenna A2I in the rear interior region of the vehicle. Only the reception areas of the respective antennas are shown schematically, namely the reception area SBA1 of the outside antenna AlA, the reception area SBI1 of the inside antenna All, the reception area SBA2 of the outside antenna A2A and finally the reception area SBI2 of the inside antenna A2I. Objects located within the respective reception areas can eventually communicate with the respective antennas. It should merely be mentioned that the interior antenna All is intended to communicate with objects located in the passenger compartment or passenger compartment FGZ of the vehicle FZ, while the interior antenna A2I is intended to communicate with objects located in the trunk KOR of the vehicle FZ are located.

In the context of a conventional function of a passive access system or a passive access arrangement, by a specific event (pulling a door handle or approaching an identification transmitter or a person to the vehicle) from the transmission device Sl via the external antenna AlA, for example, to a User assigned identification transmitter IDGl a request signal Ql that responds with a response signal Rl in which its identifier or an authentication code are included. The receiving device El receives the response signal R 1 via the external antenna AlA and forwards its content to the vehicle-side control and evaluation device STAE. This checks the validity of the authentication code or the identifier of the identification transmitter and causes a door closing device TS to unlock a vehicle door associated with this FZT. A corresponding question-answer dialogue can also be carried out, for example, via the internal antenna All with an identification transmitter IDG located in the vehicle interior as part of a start system or start procedure. For example, press the ID transmitter IDG2 entraining user a start / stop button for activating the drive motor so is the vehicle-side control and evaluation via the first communication device Kl the just-addressed question-answer dialog (request signal Q2, response signal R2) executed by the finally the IDG IDG2 transmits its identifier or its authentication code via the first communication device K1 to the vehicle-side control and evaluation device. This checks the authentification code or the identifier for their validity and, in the positive case, will enable an engine start device MSE, so that it activates the drive motor (an internal combustion engine or an electric motor).

In addition to these actual functions of an anti-theft system, namely as an entry system or as a start system as described above, the anti-theft system shown in FIG. 1 is also capable of handling certain objects, such as identification transmitters associated with the vehicle (for example the IDGs IDG1 and IDG2 ) in certain areas inside or outside the vehicle.

Let it be assumed that a person who has traveled with the vehicle FZ as a passenger has lost his identification transmitter IDG2 inside the vehicle. As this passenger encounters the loss and is already out of sight of the vehicle FZ, the driver of the vehicle to which the identification transmitter IDG3 is assigned wants to remotely determine whether the person entering the vehicle is near the IDG2 (in or outside the vehicle in close proximity) has lost. For such a search, he now uses his IDG IDG3, which is constructed as follows.

It has three buttons TAI, TA2 and TA3, by means of which a user can trigger certain control commands. For example, the button TA2 may be assigned the function of unlocking the vehicle, while the button TA3 may have the function of locking the vehicle. Riegelns the vehicle may be associated (corresponding to the function of a conventional electronic key for remote control of a central locking of a vehicle). In the example of FIG. 1, the key TAI is assigned the function of initiating the locating of objects in specific areas inside or outside the vehicle FZ assigned to the identification transmitter IDG3. If one of the three keys is pressed by a user, information about it is passed to an identification transmitter-side control device ST, which is further connected to an identification transmitter-side display DSP (for example an LCD display) and an identification transmitter-side transmitter / receiver SE. The transmitting / receiving device SE furthermore has an identification transmitter-side antenna AN for transmitting and receiving signals or radio signals. It should be noted that the other ID encoders IDG1 and IDG2 shown in the figure have the same structure as the ID encoders IDG3 and therefore will not be explained separately.

As described above, if the driver of the vehicle wants to initiate a search of objects in the vicinity of the vehicle FZ, in particular of the lost ID transmitter IDG2 remotely, he presses the key TAI of his ID transmitter IDG3 in the first step. The control device ST recognizes the pressing of the TAI button and instructs the transmitting / receiving device SE, via the antenna AN to send a request signal AFS with the instruction to the vehicle FZ, that the vehicle FZ objects assigned to him in one or more areas within or looking outside the vehicle FZ. More precisely, objects are to be searched for in the vehicle or in the immediate vicinity outside the vehicle.

In a second step, the second communication device K2 or its receiving device E2 receives the request signal AFS via the external antenna A2A and transmits it to the vehicle-side control and evaluation device STAE. took a third step further. Triggered by this request signal, the vehicle-side control and evaluation STAE according to a third step, a command to the two communication devices Kl and K2 or at their transmitting devices Sl or S2 from that they now on the outdoor antennas AlA and A2A, and on the indoor antennas All and A2I send out request signals with a specific field strength in order to search the reception areas or search areas SBA1, SBA2 and SBI1 and SBI2 for objects, such as the identification transmitter IDG2.

In the present case, as shown in Figure 1, it is assumed that the sought IDG IDG inside the vehicle, namely in the passenger compartment FGZ. Thus, according to a fourth step, the ID transmitter IDG2 receives via its antenna AN the request signal Q2 sent from the inner antenna All. After receiving this request signal via the transmitting / receiving device SE and forwarding to the control device ST of the IDG IDG2, the control device ST issues a command to the

Transceiver SE that this sends back via the antenna AN a response signal R2 according to a fifth step. According to a sixth step, the first communication device Kl or its receiving device El now receives the response signal R2 via the antenna All and forwards it to the vehicle-side control and evaluation device STAE. It should be noted that in the present case it is assumed that the identification transmitter IDG2 is the only object that is located near the vehicle (that is to say in the vehicle or in the immediate vicinity outside the vehicle).

According to a seventh step, the vehicle-mounted control and evaluation device STAE now summarizes the result of the search and generates information which in the simplest case indicates whether or not an object has been found near the vehicle. According to an advantageous embodiment, the result information can further contain information about the number of found objects and / or can provide information about contain the search area in which one or more objects have been found. According to a further advantageous embodiment, a found object with its response signal (in the example shown above, the IDG2 IDG2 with the response signal R2) transmit an identifier of the object, so that in the result information in addition to or alternatively to the above presented data also a name of the found object can be inserted with. For the following description, it is assumed that the result information contains information as to whether an object was found, how many objects were found, in which search area they were found, and, if appropriate, which designation these found objects have.

After compiling the result information, the vehicle-side control and evaluation device forwards this result information according to an eighth step of the second communication device K2 (but possibly also the first communication device Kl), so that a result signal EGS with the result information is transmitted via a corresponding transmission device S2 (or Sl) or to the requesting ID transmitter IDG3 is sent.

In the identification transmitter IDG3, according to step 10, the received result signal EGS is transmitted via the antenna AN and the

Transmitting / receiving device SE to the control device ST passed, which processes the result signal EGS and the display device DSP on a display assigned to the ID transmitter IDG3 user according to step eleven. For example, according to the search shown above, a result text may appear on the display DSP "an object found: identification transmitter IDG2, in the search area: passenger compartment." In this way, the passenger knows that their identification transmitter IDG2 is somewhere in the vehicle interior, in the passenger compartment Passenger cell is lost, and can focus on the search in this area or does not have to search in the vicinity of the vehicle for the IDG2 IDG. It should be noted that other objects can be provided with a corresponding transceiver, which are associated with the vehicle. For example, a warning triangle or a first aid kit can be provided with a corresponding transceiver, so that a driver of a vehicle knows at any time whether he carries the necessary for the operation of a vehicle with objects in the vehicle.

Although only the case has been described that an ID transmitter IDG2 inside the vehicle has been forgotten or lost, and found by means of the vehicle-side part of the anti-theft system of the vehicle FZ, it is also conceivable that an identification transmitter or other objects with a corresponding Transceiver can be searched or found by the vehicle FZ, which are located outside the vehicle, in particular in the immediate vicinity of the vehicle, for example in the search areas SBAl and SBA2. For this purpose, the identification transmitter IDG1 is also shown in Figure 1, which has been lost for example by another person traveling with the vehicle FZ outside the vehicle. According to the above-described search process with respect to the IDG IDG2, a search process can also be triggered for the IDG IDG1 by means of an IDG3 transmitter, triggered by the receipt of the request signal AFS from the vehicle control and evaluation device STAE again request signals of the various antennas of the communication device Kl and K2 be sent, the IDG IDGl in the example receives a request signal Ql, and a corresponding response signal Rl returns, so that now the vehicle-side control and evaluation device can send a result signal with information to the IDG IDG3, which states that an object has been found, namely the identification transmitter IDGl, in a specific search area in the front left outside of the vehicle. Egg- ne such result information can then be displayed again on the display device DSP of the IDG IDG3 for a user so that he knows the approximate location of the IDG IDGl.

Finally, consider the case that, triggered by a request signal AFS (eg from the IDG IDG3), a search is started for objects in the vehicle or in the immediate vicinity outside the vehicle, although no object assigned to the vehicle is in a search area located.

After issuing the instruction according to the above-described third step that request signals about the respective antennas are to be output to the search areas, the on-vehicle control and evaluation unit STAE will start a time measuring means to measure the time. If a predetermined time interval TM has elapsed, within which no response signal has been received from any antenna, the control and evaluation device assumes that no object is in a search area and will now summarize in the above-mentioned step 7 as a result no object was found. The notification of this result is again analogous to the methods described above.

While it is advantageous for a portable identification transmitter as part of an anti-theft system that when transmitting a signal or radio signal corresponding to the pressing of one of the buttons for activating unlocking or locking the vehicle, as explained with respect to the keys TA2 or TA3 to the IDG IDG3 If authentication of the signal takes place, it is conceivable that authentication of the search-initiating signal AFS also takes place for searching objects in accordance with the above-described pressing of the TAI key. For this purpose, for example, be sent with the same signal AFS with an identification code, which then on the vehicle side of the Control and evaluation STAE is checked for its eligibility or validity. Only if the identification code is valid, the search for objects is then performed. Consequently, in a simple embodiment, an identification transmitter can be designed as a remote control only for searching for objects in or in the vicinity of the vehicle, while in an expanded embodiment it can also be designed as a remote control for unlocking or locking the vehicle.

Claims

claims

A method of operating an anti-theft system for a vehicle in which a portable identification transmitter (IDG3) associated with the anti-theft system performs the step of: transmitting a request signal (AFS) with the instruction to indicate the presence of objects (IDG1, IDG2) associated with the vehicle in one determine certain area (SBAl, SBA2, SBI1, SBI2) in and / or outside the vehicle (FZ);

and in which an on-board part of the anti-theft system performs the following steps:

Receiving the request signal (AFS);

Checking the presence of the objects (IDG1, IDG2) in and / or outside the vehicle;

Sending out a result signal (EGS) with information as to whether objects associated with the vehicle have been found in checking the presence.

2. The method of claim 1, wherein checking the presence by means of the following steps:

Emitting a request signal (Ql, Q2) into the vehicle interior (FGZ, KOR) and / or the vehicle exterior;

Checking whether a response signal (R1, R2) of an object (IDG1, IDG2) is received.

3. The method according to any one of claims 1 or 2, wherein the vehicle (FZ) associated with the portable identification transmitter (IDG3) is further adapted to receive the result signal (EGS).

4. The method according to any one of claims 1 to 3, wherein the objects assigned to the vehicle include further identification transmitter (IDG1, IDG2) assigned to the vehicle, or other objects provided with a communication device.

5. The method according to any one of claims 1 to 4, wherein during the checking of the presence in the vehicle interior (SBIl, SBI2) and / or vehicle exterior space (SBAl, SBA2) a plurality of request signals with different

Field strengths or a plurality of request signals at different positions (Kl, K2) are emitted.

6. Anti-theft system for a vehicle (FZ), having the following features:

a portable identification transmitter (IDG3) for transmitting a request signal (AFS) with the instruction, the presence of the vehicle associated objects (IDGl, IDG2) in a certain area (SBAl, SBA2, SBIl, SBI2) in and / or outside of the vehicle (FZ) determine;

a vehicle-side receiving device (Kl, El, K2, E2) for receiving a request signal (AFS);

a vehicle-mounted control and evaluation device (STAE) for checking the presence of the objects in the one or more specific areas of the vehicle and for outputting information as to whether an object associated with the vehicle has been found;

a vehicle-side transmitting device (Kl, Sl; K2, S2) for emitting a result signal (EGS) with the information on the finding of objects.

7. Anti-theft system according to claim 6, wherein for checking the presence of the objects, the vehicle-side Control and evaluation device causes the vehicle-side transmitting device to emit at least one request signal (Ql, Q2) in the one or more specific areas of the vehicle, and the vehicle-mounted control and evaluation (STAE) in response to the receipt of a respective response signal (Rl, R2 ) detects the presence of an object sending the response signal via the vehicle-side receiving device.

8. Anti-theft system according to one of claims 6 or 7, wherein the portable ID transmitter (IDG3) is further designed so as to effect by an authentication unlocking the vehicle or activating the drive motor.

9. Anti-theft system according to one of claims 6 to 8, wherein the result signal (EGS) is received by the portable identification transmitter.

10. Anti-theft system according to claim 9, wherein the portable identification transmitter has an output device (DSP) to output the content of the result signal (EGS) to a user.

11. Anti-theft system according to one of claims 6 to 10, wherein for checking the presence of the objects, the vehicle-side control and evaluation device causes the vehicle-side transmitting device to send a plurality of request signals with different field strength.

12. Anti-theft system according to one of claims 6 to 11, wherein the vehicle-side transmitting device comprises a plurality of antennas (AlA, All, A2A, A2I) for attachment to different positions on the vehicle (FZ), wherein for checking the presence of the on-board control and evaluation device the on-board transmitter causes a plurality of request signals to be sent out at the different positions.

13. Vehicle, in particular motor vehicle, with an anti-theft system according to one of claims 6 to 12.