Access arrangement for a vehicle

Abstract

Access arrangement (ZA) for a vehicle (FZ), with the following features: - a vehicle-side transmitting / receiving device (SEF) for the sequential transmission of request signals (AFX; AFX1, AFX2, AFX3) and for receiving response signals (AWX; AWX1, AWX2, AWX3) based on the request signals; - at least one mobile identification transmitter (IDG) comprising an identification transmitter-side transmitting / receiving device (SEI) for receiving the request signals (AFX) of the vehicle-side transmitting / receiving device (SEF), and for transmitting a response signal (AWX) in response to the receipt of one or more request signals (AFX); - a vehicle-side control device (STF) for outputting a control command (STB1) to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal in response to the receipt of one or more request signals (AFX) when the vehicle-side transmitting / receiving device (SEF) has received a predetermined number (AA1; AA2) of response signals (AWX; AWX2), or a first predetermined time interval (IT2) has elapsed since receipt of a response signal, characterized by that the mobile identification transmitter (IDG) further comprises an identification transmitter-side control device (STI) which is designed to cause the identification transmitter-side transmitting / receiving device (SEI) to no longer transmit a response signal in response to the receipt of one or more request signals (AWX, AWX2), wherein the identification transmitter-side control device (STI) is further configured to cause the identification transmitter-side transmitting / receiving device (SEI) to transmit a response signal in response to the receipt of one or more request signals (AWX, AWX2), if the identification transmitter-side transmitting / receiving device has not received any further request signal within a third predetermined time interval (IT3) since receiving the last request signal.

Description

[0001] The present invention relates to an access arrangement for a vehicle, in particular a motor vehicle, and to a method for operating such access arrangements for a vehicle. Furthermore, the invention comprises a vehicle with the aforementioned access arrangement.

[0002] To prevent unauthorized access to a vehicle, particularly a motor vehicle, modern access authorization systems or access arrangements in vehicles use electronic security systems in which, to authenticate a user, data communication takes place between a first communication device in the vehicle and a second communication device in a user's mobile identification device, such as a key or key fob. In an active access arrangement, control signals and an identification code are sent from the mobile identification device to the vehicle in response to the user pressing a specific button on the mobile identification device. Upon this, the vehicle is unlocked or locked if the identification code is correct.

[0003] In so-called passive access arrangements, a first communication device in the vehicle initially sends out query signals of a specific field strength at regular intervals to check whether a mobile identification transmitter is within the proximity or detection range of the vehicle. If a mobile identification transmitter approaches the vehicle, it will respond to the receipt of a query signal with a corresponding response signal to initiate an authentication process or pre-authentication process. Data is exchanged during this process, in which the mobile identification transmitter ultimately transmits its authentication code to the vehicle. If the authentication code is successfully verified, a user located directly at the vehicle can then unlock the corresponding vehicle door or all vehicle doors by operating a door handle.Since no active activation of a mechanical or electrical identification device or key by a user is required, this type of access authorization is also referred to as passive access authorization verification and the corresponding access authorization systems are referred to as passive electronic access authorization systems.

[0004] However, with a passive access arrangement such as the one just described, the following problematic situation can arise. A user or driver parks their vehicle and leaves it. They then place their key in a designated location in their nearby house. As already mentioned above, the vehicle (continues to) periodically send request signals, which are received by the placed key, since it is within the detection or proximity range of the vehicle. In other words, the key is awakened by each request signal from the vehicle, generates a response signal, and sends it back to the vehicle.Although this is not a driver request to perform authentication to gain entry to the vehicle, the key's regular wake-up signal and subsequent transmission of a corresponding response signal consume unnecessary power, thereby reducing the service life of the key or ID transmitter. Furthermore, the vehicle also consumes unnecessary power by receiving and processing the response signals.

[0005] DE 199 60 260 A1 discloses a method for operating a keyless access control device. Following a locking or closing operation, a query signal is transmitted intermittently several times within a certain period of time. If a response signal is received from a transponder each time within the specified period, the transponder is blocked from future locking or unlocking operations.

[0006] Document DE 10 2009 018 602 A1 discloses a passive unlocking system for a motor vehicle. The motor vehicle can send a control signal to a key, causing it to set a flag in its memory that prevents it from responding to interrogation signals from the vehicle.

[0007] Document DE 10 2006 016 495 A1 discloses an energy-efficient passive locking system for a vehicle. The portable communication device associated with the locking system comprises a receiver for receiving a call signal from the vehicle, wherein the device responds to the call signal when in a response state and does not respond to the call signal when in a non-response state.

[0008] The publication DE 10 2012 216 843 B3 discloses an access arrangement for a vehicle in which the reception sensitivity of a mobile identification transmitter assigned to the access arrangement is adjustable for receiving vehicle-side interrogation signals. If the mobile identification transmitter receives an interrogation signal from the vehicle, it will lower the reception sensitivity until no further interrogation signals are received. However, if the mobile identification transmitter receives an interrogation signal, it will always respond.

[0009] Therefore, the object of the present invention is to provide a possibility by which the operation of an access arrangement can be ensured with minimized power consumption.

[0010] This problem is solved by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

[0011] An access arrangement or an identification arrangement for a vehicle, by which, in particular, access to the vehicle can be controlled, comprises the following features. It has a vehicle-side transmitting / receiving device for sequentially transmitting request signals and for receiving response signals in response to the request signals. Furthermore, the access arrangement has at least one mobile identification transmitter with a transmitting / receiving device on the identification transmitter for receiving the request signals from the vehicle-side transmitting / receiving device and for transmitting a response signal in response to the receipt of one or more request signals.Furthermore, the access arrangement has a vehicle-side control device for outputting a control command to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal in response to the receipt of one or more request signals when the vehicle-side transmitting / receiving device has received a predetermined number of response signals, or a first predetermined time interval (e.g. in the range of 20 seconds to several minutes) has elapsed since the receipt of a response signal, in particular a first response signal after the transmission of one or more request signals. Since this regular transmission of response signals consumes unnecessary power, the unnecessary power consumption can be minimized by the output of the control command by the vehicle-side control device when the mobile identification transmitter is within a detection range of the vehicle orthe vehicle-side transmitting / receiving device.

[0012] According to the invention, the at least one mobile identification transmitter further comprises an identification transmitter-side control device configured to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal in response to the receipt of one or more request signals. This means that in the mobile identification transmitter, the intelligence lies in the identification transmitter-side control device, which is capable of controlling the identification transmitter-side transmitting / receiving device.

[0013] According to the invention, the identification transmitter-side control device is further configured to cause the identification transmitter-side transmitting / receiving device to transmit a response signal again. This occurs when the identification transmitter-side transmitting / receiving device has not received another request signal within a third predetermined time interval (for example, between 2 and 30 seconds, in particular configurable from the vehicle side) since receiving the last request signal. If a mobile identification transmitter receives a vehicle-side request signal, it is still within the detection range of the request signals, i.e., in the vicinity of the vehicle. However, if the mobile identification transmitter and its user move away from the vehicle, the mobile identification transmitter leaves the detection range of the vehicle-side request signals and will no longer receive such request signals.However, to switch back to a proper and fully functional mode, or normal mode, the control device on the ID transmitter side now has the intelligence to reactivate the transmit / receive device on the ID transmitter side to transmit a response signal. This allows the control device on the ID transmitter side to switch from a "mute mode" to a normal mode.

[0014] According to one embodiment of the access arrangement, the vehicle-mounted control device issues the control command when both of the above-mentioned trigger conditions for the control command apply, i.e., when the vehicle-mounted transmitting / receiving device has received the predetermined number of response signals within the first predetermined time interval. In this way, the vehicle-mounted control device can define a precise observation period within which the predetermined number of response signals may be received. Consequently, the reliability of the access arrangement is improved.

[0015] According to a further embodiment, the vehicle-mounted transmitting / receiving device transmits the request signals at second predetermined time intervals (e.g., 500 milliseconds). In particular, the request signals are transmitted regularly or continuously at the second predetermined time intervals.

[0016] According to a further embodiment, the vehicle-mounted transmitting / receiving device sends a corresponding control signal to the at least one mobile identification transmitter in response to receiving the control command from the vehicle-mounted control device. This ensures that the mobile identification transmitter can implement the control command to no longer transmit a response signal in response to receiving one or more request signals.

[0017] According to one embodiment of the access arrangement, the identification transmitter-side control device is configured to, in response to the receipt of the control signal or control command by the identification transmitter-side transmitting / receiving device, cause the latter to cease transmitting a response signal. This means that in this case, the identification transmitter-side control device follows the vehicle-side control device.

[0018] According to a further embodiment, the identification transmitter-side transmitting / receiving device is configured to measure the field strength of a request signal at the location of the mobile identification transmitter. This field strength can then be sent back to the vehicle with a response signal so that the vehicle can determine a distance between the vehicle and the mobile identification transmitter or a location of the mobile identification transmitter relative to the vehicle. Furthermore, the identification transmitter-side control device can cause the identification transmitter-side transmitting / receiving device to transmit the response signal again if the measured field strength of a first request signal and the measured field strength of a further, subsequent measured request signal differ by more than a predetermined threshold value.The change in field strength from the request signal to the next request signal means that the mobile identification transmitter has moved, for example, from one zone to another around the vehicle. This makes it possible to "mute" a mobile identification transmitter that has remained in one zone and then return it to its normal state when it leaves the zone again, for example, moving toward the vehicle.

[0019] For the purpose of saving power, according to a further embodiment, it is also possible for the identification transmitter-side control device to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal in response to the receipt of one or more request signals for only a fourth predetermined time interval. After the fourth time interval has elapsed, a response signal can then be transmitted again, so that the vehicle can check whether the mobile identification transmitter is still within the detection range of its request signal. If necessary, it can then transmit another control signal or control command to prevent the transmission of response signals again. The fourth time interval can either be determined by the identification transmitter-side control device or, for example, be transmitted along with the control signal from the vehicle-side control device.The fourth predetermined time interval may be longer than the third predetermined time interval.

[0020] It is further conceivable that, after a fifth predetermined time interval following the transmission of the (first) control signal or control command, the vehicle or the vehicle-side control device issues a further control command, with which the identification transmitter-side transmitting / receiving device, in particular by the identification transmitter-side control device, is instructed to again transmit a response signal in response to the receipt of one or more request signals. This means that, in this embodiment, the intelligence for suppressing the response signals and reactivating the transmission of the response signals lies solely with the vehicle-side control device, which can effect the switching from silent mode to normal mode.

[0021] According to a further embodiment, it is conceivable that the vehicle-side transmitting / receiving device is configured to transmit the request signals as request signals of a first type and request signals of at least one second type. The request signals of the first type can, for example, function as presence signals with only a short protocol in order to request a first short response signal from the mobile identification transmitter only to confirm its presence. The request signals of the at least one second type, on the other hand, can comprise location signals with a longer protocol than the presence signals, with which the mobile identification transmitter can additionally request a field strength of a location signal determined by the mobile identification transmitter at the location of the mobile identification transmitter.

[0022] In this context, the identification transmitter-side transmitting / receiving device can then be prompted by the control command to no longer transmit a response signal only upon receipt of a specific type of request signals, for example, to no longer transmit a response signal upon receipt of the request signals of the first type.

[0023] The mobile identification transmitter can be designed as an electronic key, but also as a smart device, such as a smartphone (smart phone), a smartwatch (smart watch), a fitness tracker (fitness monitoring device), etc.

[0024] According to a further aspect of the invention, a vehicle with an access arrangement according to the above illustration or an embodiment thereof is provided.

[0025] According to a further aspect of the invention, a method for operating an access arrangement for a vehicle is provided, in particular according to the above illustration or an embodiment thereof. The method comprises the following steps: A plurality of request signals are transmitted by the vehicle. These request signals are received by at least one mobile identification transmitter. Furthermore, a response signal is transmitted in response to the receipt of one or more request signals by the mobile identification transmitter. These response signals based on the request signals are received by the vehicle. A control command is then issued by the vehicle to cause the mobile identification transmitter to no longer transmit a response signal in response to the receipt of one or more request signals when the vehicle has received a predetermined number of response signals.

[0026] In this way, a mobile identification transmitter located within the detection range of a vehicle's request signals can save power because it no longer needs to send a response signal after receiving the control command.

[0027] According to the invention, a third predetermined time interval is further measured since the receipt of the last request signal by the mobile identification transmitter, and the mobile identification transmitter is in turn caused, after expiration of the third predetermined time interval, to transmit a response signal in response to the receipt of one or more request signals if no further request signal has been received within the third predetermined time interval.

[0028] Advantageous embodiments of the access arrangement are, to the extent that they are transferable to the vehicle or the method, also applicable as advantageous embodiments of the vehicle or the method, and vice versa.

[0029] In the following, exemplary embodiments of the present invention will be explained in more detail with reference to the accompanying drawings. They show: Fig. 1 a schematic representation of a passive electronic access authorization system or an access arrangement according to an embodiment of the invention; Fig. 2 shows a time sequence for the power-saving setting of a mobile identification transmitter located in the detection range of a vehicle, according to a first embodiment; Fig. 3 shows a time sequence for the power-saving setting of a mobile identification transmitter located in a detection area of a vehicle, according to a second embodiment.

[0030] It is initially Fig. 1, in which a passive access arrangement ZA for a vehicle FZ, which is designed in particular as a motor vehicle, is shown. As a component of the vehicle-side part of the access arrangement, a vehicle-side transmitting / receiving device SEF is provided, which is designed to transmit request signals in temporal succession via a vehicle-side antenna ANF (it is conceivable to use a plurality of antennas for the purpose of transmitting and receiving instead of a single antenna ANF). In particular, the request signals can be transmitted regularly in temporal succession in first predetermined time intervals IT1 (cf. also Fig. 2) are sent. To illustrate the operation of the access device or the setting of the mobile identification transmitter IDG, Fig. 1 the identification transmitter IDG (as a mobile part of the access arrangement ZA) is shown at three different positions POS1, POS2 (both in the detection area EFB) and POS3 (outside the detection area EFB).

[0031] The mobile identification transmitter IDG can be embodied as an electronic vehicle key, but also as another portable device, such as a smartphone (smart phone), a smartwatch (smart watch), or a fitness tracker. It comprises an identification transmitter-side transmitting / receiving device SEI, with which it can receive vehicle-side request signals AFX via an identification transmitter-side antenna ANI, and with which it can, in turn, transmit corresponding response signals AWX via the antenna ANI (it is conceivable to use multiple antennas for the purpose of transmitting and receiving instead of a single antenna ANI).Furthermore, the identification transmitter-side transmitting / receiving device SEI can be configured to measure and evaluate the field strength FSX of a received vehicle-side request signal AFX at the location of the mobile identification transmitter IDG, for example, as part of an RSSI (Received Signal Strength Indication) measurement. Furthermore, the mobile identification transmitter IDG has an identification transmitter-side control device STI for controlling the identification transmitter-side transmitting / receiving device SEI. As will be explained in more detail later, the identification transmitter-side control device STI can issue certain control commands to the identification transmitter-side transmitting / receiving device to set power-saving operation.

[0032] The mobile identification transmitter IDG further comprises a timer ZME to measure predetermined time intervals (see also the description of Fig. 2). Furthermore, the mobile identification transmitter IDG features an actuating element in the form of a TAI button, which can be activated by a user or driver. By pressing the TAI button, the user can manually restore the transmitter-side transmitting / receiving device to a proper state, in which the vehicle-side request signals are properly responded to.

[0033] Furthermore, the mobile identification transmitter IDG has a storage device SPI in which an evaluated field strength of a received request signal, but also an identification transmitter-side code can be stored.

[0034] In order to measure certain time intervals which are necessary for the operation of the access arrangement to be described below, the vehicle also has a vehicle-side time measuring device (“timer”) ZMF which is connected to the vehicle-side control device STF.

[0035] It is now on Fig. 2, in which the timing of the operation of the access arrangement ZA according to a first possible embodiment is shown.

[0036] It is assumed that the vehicle or the on-board transceiver device SEF regularly transmits request signals AFX starting at time T0 to check whether a mobile identification transmitter is in its vicinity. Request signals AFX are shown in dashed lines if they cannot yet be received by a mobile identification transmitter, while they are shown in solid lines if the mobile identification transmitter is within the detection range EFB and can receive the request signals AFX.

[0037] At time T1, it is assumed that the mobile identification transmitter IDG has moved to position POS3 on its way to the vehicle FZ. Because it is located outside the detection range EFB, it cannot (yet) receive any vehicle-side request signals AFX.

[0038] Then, at time T2, it moves to position POS2, i.e., into the detection zone EFB. As just described, the vehicle transmits a request signal AFX, which is now received for the first time by the mobile identification transmitter or its transmitter-side transceiver SEI and answered with a first response signal AWX. This is repeated two more times within the time interval between times T2 and T3.

[0039] Now it is conceivable that immediately after receiving the first response signal AWX, the vehicle-side control device STF can acknowledge the entry of the mobile identification transmitter into the detection area EFB with an information signal to the user and, for example, within the framework of a “Welcome Lighting” function, issues a light control command LSTB to a light source, in particular a turn signal or ambient lighting LQ (see Fig. 1) to activate the light source for a specific time, for example, 10 seconds. However, it is also conceivable that this greeting function is also initiated after receiving the second or third response signal from the mobile identification transmitter.

[0040] Now, the vehicle-side control device STF is configured, upon receipt of the third response signal, and in particular when these three response signals have arrived within a second predetermined time interval IT2 (beginning with the receipt of the first response signal AWX), to instruct the identification transmitter-side transmitting / receiving device to no longer transmit a response signal AWX in response to the receipt of one or more request signals. For this purpose, the vehicle-side control device STF issues a control command STB1 to the vehicle-side transmitting / receiving device SEF so that the latter transmits the command STB1 to the mobile identification transmitter either in a separate vehicle-side signal SFX or as part of a previously described request signal AFX. As described in the Fig. As shown in Figure 2, the control command STB1 is sent to the mobile identification transmitter immediately after time T3 as part of the vehicle-side signal SFX. The mobile identification transmitter receives the control command STB1 via the identification transmitter-side transmitting / receiving device SEI, which forwards it to the identification transmitter-side control device STI, which then sends a control command STBY to the identification transmitter-side transmitting / receiving device to instruct it not to transmit a response signal in response to the receipt of one or more request signals AFX.

[0041] According to one embodiment, the vehicle-side control device STF can be configured to use the expiration of the second predetermined time interval IT2 (beginning with the reception of the first response signal AWX) instead of using a predetermined number of received response signals as a trigger criterion for issuing a control command STB1, in order to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal AWX in response to the reception of one or more request signals.

[0042] In the period between times T3 and T4, the mobile identification transmitter IDG receives two more request signals AFX, but no longer responds to them.

[0043] The mobile identification transmitter then moves again from position POS2 toward position POS3, where it arrives at time T4. At this point, it is again outside the detection range EFB, meaning that subsequent request signals AFX can no longer be received by the mobile identification transmitter between times T4 and T6. However, the mobile identification transmitter IDG or its timing device ZME now measures a third predetermined time interval IT3 since receiving the last request signal. Once this time interval has elapsed, the timing device ZME will send a message to the identification transmitter-side control device STI, which will then send a control command STBY to the identification transmitter-side transmitting / receiving device SEI, instructing it to properly respond to request signals AFX from the vehicle FZ.

[0044] The next time the mobile identification transmitter moves from position POS3 to position POS2 or position POS1, the same process can occur again as just described from time T1.

[0045] In Fig. 2 now describes the operation sequence of an access arrangement in the case where, in order to save power on the identification transmitter, the vehicle can put the latter into a silent state or mode when a certain number AA1 of response signals from the identification transmitter have arrived at the vehicle FZ.

[0046] Now, based on Fig. 3, the operation of an access arrangement according to a second embodiment will be described, in which the vehicle is configured to transmit various types of request signals. Consider the case in which the vehicle (instead of the general request signals AFX) can now transmit a first type of request signal AFX1 with a short protocol solely for checking the presence of a mobile identification transmitter, as so-called presence signals. Furthermore, the vehicle or the vehicle-side transceiver SEF should be able to transmit a second type of request signal AFX2 as so-called location signals, which have a longer protocol than the presence signals and are intended to cause the mobile identification transmitter to transmit the measured field strength of the request signals AFX2 at the location of the mobile identification transmitter back to the vehicle in a response signal.In addition to these two request signals, it is also possible for the vehicle FZ to send a third type of request signal AFX3, which, as passive access signals, request an identification transmitter-side code from the mobile identification transmitter IDG for authentication, for example.

[0047] It is assumed that the mobile identification transmitter IDG is located at position POS3 around the vehicle FZ at time T01. The vehicle transmits the above-mentioned presence signals AFX1, which, however, cannot yet be received by the mobile identification transmitter IDG. If the mobile identification transmitter is located at position POS2 at time T11 (see Fig. 1), it receives the request signals AFX1 and sends back a corresponding response signal AWX1 to indicate to the vehicle that it is now within the detection range EFB. The vehicle-side control device STF then carries out a switching process US on the vehicle-side transmitting / receiving device SEF, so that it now begins to transmit the second request signals, namely the location signals AFX2. The mobile identification transmitter responds to each received location signal AFX2 with a second response signal AWX2, which also contains the value of the measured field strength FSX of the location signal at the location of the mobile identification transmitter. After the vehicle-side control device STF has received a second predetermined number AA2 of response signals AWX2 (namely 3 response signals AWX2) in the time interval between times T21 and T41, it implements several measures to save power.

[0048] Firstly, it causes a second control command STB2 with a control signal SFX to be sent to the mobile identification transmitter IDG via the vehicle-side transmitting / receiving device SEF. This is intended to prevent the mobile identification transmitter from responding to all request signals. In the example of Fig. 3, the control command STB2 should cause the mobile identification transmitter IDG to no longer respond to the presence signals AFX1, but to other request signals.

[0049] To also save power on the vehicle side, the on-board control unit STF sends an instruction to the on-board transceiver unit SEF to transmit the presence signals AFX1 with a short protocol instead of the location signals AFX2. Accordingly, a switching process US2 is performed in the on-board transceiver unit SEF.

[0050] The vehicle-side transmitting / receiving device then begins to transmit presence signals AFX1, which the mobile identification transmitter IDG or its transmitting / receiving device SEI receives but no longer responds to.

[0051] Now, it is assumed that at time T61, the mobile identification transmitter IDG and its user have moved to position POS1 in the immediate vicinity of the vehicle FZ. Here, the user pulls, for example, a door handle TG with the intention of entering the vehicle. This actuation of the door handle TG is reported via the vehicle-side control unit STF to the vehicle-side transceiver unit SEF, which then sends a passive access signal AFX3 to the mobile identification transmitter to request its identification code. Since the mobile identification transmitter IDG is still permitted to respond to this signal, it sends its code back with its response signal AWX3, which is forwarded to the vehicle-side control unit STF for verification. If the code matches a code stored in the vehicle, the control unit STF unlocks a door lock TS.

[0052] It is now conceivable that upon receiving the passive access signal AFX3 or after transmitting the response signal AWX3, the identification transmitter-side control device STI uses a control command STBY to cause the identification transmitter-side transmitting / receiving device SEI to respond properly to all request signals.

[0053] It is also conceivable that in the case where the mobile identification transmitter at time T6 does not move in the direction of the vehicle, ie to position POS1, but rather to position POS3, the identification transmitter-side control device STI determines the time interval since the last received request signal by means of the time measuring device ZME, and as in Fig.2 after a certain time interval has elapsed without having received a further request signal, the identification transmitter-side transmitting / receiving device SEI switches back to normal operation, in which it responds to all request signals.

[0054] According to one embodiment, the vehicle-side control device STF can again be configured to use the expiration of the predetermined time interval IT23 (beginning with the reception of the first response signal AWX2) instead of using a predetermined number AA2 of received response signals as a trigger criterion for issuing a control command STB2, in order to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal AWX1 in response to the reception of one or more first request signals.

Claims

[1] Access arrangement (ZA) for a vehicle (FZ), with the following features: - a vehicle-side transmitting / receiving device (SEF) for the sequential transmission of request signals (AFX; AFX1, AFX2, AFX3) and for receiving response signals (AWX; AWX1, AWX2, AWX3) based on the request signals; - at least one mobile identification transmitter (IDG) comprising an identification transmitter-side transmitting / receiving device (SEI) for receiving the request signals (AFX) of the vehicle-side transmitting / receiving device (SEF), and for transmitting a response signal (AWX) in response to the receipt of one or more request signals (AFX); - a vehicle-side control device (STF) for outputting a control command (STB1) to cause the identification transmitter-side transmitting / receiving device to no longer transmit a response signal in response to the receipt of one or more request signals (AFX) when the vehicle-side transmitting / receiving device (SEF) has received a predetermined number (AA1; AA2) of response signals (AWX; AWX2), or a first predetermined time interval (IT2) has elapsed since receipt of a response signal, characterized by , that the mobile identification transmitter (IDG) further comprises an identification transmitter-side control device (STI) which is designed to cause the identification transmitter-side transmitting / receiving device (SEI) to no longer transmit a response signal in response to the receipt of one or more request signals (AWX, AWX2), wherein the identification transmitter-side control device (STI) is further configured to cause the identification transmitter-side transmitting / receiving device (SEI) to transmit a response signal in response to the receipt of one or more request signals (AWX, AWX2), if the identification transmitter-side transmitting / receiving device has not received any further request signal within a third predetermined time interval (IT3) since receiving the last request signal. [2] Access arrangement according to claim 1, wherein the vehicle-side control device (STF) outputs the control command (STB1) when the vehicle-side transmitting / receiving device (SEF) has received the predetermined number (AA1; AA2) of response signals (AWX; AWX2) within the first predetermined time interval (IT2). [3] Access arrangement according to claim 1 or 2, wherein the vehicle-side transmitting / receiving device (SEF) transmits the request signals at second predetermined time intervals (IT1). [4] Access arrangement according to one of claims 1 to 3, wherein the vehicle-side transmitting / receiving device (SEF) transmits a control signal (SFX) to the mobile identification transmitter (IDG) in response to the receipt of the control command (STB1). [5] Access arrangement according to claim 4, wherein the identification transmitter-side control device (STI) is arranged to cause the identification transmitter-side transmitting / receiving device (STI) to no longer transmit a response signal in response to the receipt of the control command (STB1). [6] Access arrangement according to claim 1, wherein the identification transmitter-side transmitting / receiving device (SEI) is configured to measure the field strength of a request signal at the location of the mobile identification transmitter (IDG), and the identification transmitter-side control device (STI) causes the identification transmitter-side transmitting / receiving device (SEI) to transmit the response signal again if the measured field strength of a first request signal and the measured field strength of a further subsequent measured request signal differ by more than a predetermined threshold value. [7] Access arrangement according to one of claims 1 to 6, in which the vehicle-side transmitting / receiving device (SEF) is designed to transmit request signals in a first type (AFX1) and request signals in at least one second type (AFX2, AFX3). [8] Access arrangement according to claim 7, in which the identification transmitter-side transmitting / receiving device (SEI) is caused by the control command to no longer transmit a response signal only upon receipt of the request signals of the first type (AFX1). [9] Access arrangement according to claim 8, wherein the identification transmitter-side control device (STI) is further configured to cause the identification transmitter-side transmitting / receiving device (SEI) to transmit a response signal to the receipt of the request signals of the first type (AFX1) when the identification transmitter-side transmitting / receiving device (SEI) has received a request signal of at least the second type (AFX2, AFX3). [10] Vehicle (FZ) with an access arrangement (ZA) according to one of the preceding claims. [11] Method for operating an access arrangement (ZA) for a vehicle (FZ) with the following steps: - Transmission of several request signals (AFX) by the vehicle (FZ); - Receiving the request signals (AFX) by a mobile identification transmitter (IDG); - Sending a response signal (AWX) in response to the receipt of one or more request signals by the mobile identification transmitter (IDG); - Receiving response signals (AWX) based on the request signals (AFX) by the vehicle (FZ); - issuing a control command (STB1) by the vehicle to cause the mobile identification transmitter (IDG) to no longer transmit a response signal in response to the receipt of one or more request signals when the vehicle has received a predetermined number (AA1; AA2) of response signals (AWX; AWX2) or a first predetermined time interval (IT2) has elapsed since receipt of a response signal, characterized by : Measuring a third predetermined time interval (IT3) since the receipt of the last request signal by the mobile identification transmitter (IDG), and In turn, cause the mobile identification transmitter (IDG) to transmit a response signal in response to the receipt of one or more request signals (AWX, AWX2) after expiry of the third predetermined time interval (IT3) if no further request signal has been received within the third predetermined time interval (IT3).

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