WO2020099432A1

WO2020099432A1 - Method and control unit for operating an access- and/or activation system of a vehicle

Info

Publication number: WO2020099432A1
Application number: PCT/EP2019/081067
Authority: WO
Inventors: Alexander Krebs; Alaa Mourad
Original assignee: Bayerische Motoren Werke Aktiengesellschaft
Priority date: 2018-11-13
Filing date: 2019-11-12
Publication date: 2020-05-22
Also published as: DE102018128379A1

Abstract

The invention relates to a method (400) for operating an access- and/or activation system of a vehicle (100), the access- and/or activation system comprising a Telestart transmitter (120) which is configured to emit radio signals which can be received by a receiving unit (104) of the vehicle (100). The method (400) comprises detecting (401) a temporal sequence (301) of field strength values for a corresponding temporal sequence of radio signals which have been received by the receiving unit (104). In addition, the method (400) comprises filtering (402) the temporal sequence (301) of field strength values in order to provide a filtered sequence (303) of field strength values. The method (400) also comprises determining (403), based on the filtered sequence (303) of field strength values, whether or not the Telestart transmitter (120) has been moved at a specific time. Furthermore, the method (400) comprises causing (404) the Telestart transmitter (120) to exit an idle mode when it is determined that the Telestart transmitter (120) has been moved.

Description

Method and control unit for operating an access and / or

Activation system of a vehicle

The invention relates to an access and / or activation system

Vehicle. In particular, the invention relates to a method and a

Control unit for motion detection of a telestart transmitter for an access and / or activation system of a vehicle.

Keyless entry and / or activation systems to a motor vehicle are often based on the localization and authentication of a vehicle

Telestart transmitters in a localized area on or in the vehicle.

A user carries a telestart transmitter (e.g. a key or a smartphone) with them. The telestart transmitter authenticates itself to a control unit of a vehicle via a radio link. Furthermore, the distance of the telestart transmitter to one or more reference points of the vehicle is measured using a suitable radio protocol. Based on the correct authentication key and based on a defined distance to the one or more reference points of the vehicle, access to the vehicle is then granted or denied.

In order to reduce the energy consumption of a telestart transmitter (TS), a motion sensor can be installed in the telestart transmitter. If a TS is not moved for a certain minimum period of time, the TS can move into one

Set the power saving or sleep mode, in which the TS can remain until motion occurs again. The detection of the retirement and / or the movement of the TS can be transmitted via a radio channel from the TS to the vehicle associated with the TS, so that the

Can put the vehicle into an energy-saving sleep mode.

The installation of a motion sensor in a TS leads to increased costs and an increased power consumption of the telestart transmitter. The present The document deals with the technical task of reducing the energy consumption and the costs of a vehicle access and / or activation system.

The task is solved by each of the independent claims. Advantageous embodiments include described in the dependent claims. It is pointed out that additional features are one of one

independent claim dependent claim without the features of the independent claim or only in combination with a subset of the features of the independent claim can form their own invention and independent of the combination of all features of the independent claim, which is the subject of an independent claim, a divisional application or a subsequent application can be made. This applies in the same way to the technical teachings described in the description, which can form an invention that is independent of the features of the independent claims.

According to one aspect, a method for operating an access and / or activation system of a vehicle, in particular a motor vehicle, is described. The access and / or activation system includes one

Telestart transmitter (e.g. a vehicle key and / or a smartphone) that is set up to send out radio signals that can be received by a receiving unit of the vehicle. The radio signals can be sent by a transmission unit of the Telestart transmitter. The

Radio signals are sent periodically with a certain frequency, in particular 0.1 Hz, 1 Hz or higher, from the telestart transmitter. The radio signals can in particular be Bluetooth advertising signals. The method can be carried out by a control unit of the vehicle.

The method comprises determining a temporal sequence of

Field strength values for a corresponding temporal sequence of radio signals, the were received by the receiving unit of the vehicle (at a corresponding sequence of times). A field strength signal can thus be determined, which shows how the field strength value of the radio signals received at the receiving unit changes over time. Exemplary field strength values are RSSI (Received Signal Strength Indicator) values, such as RSSI values of Bluetooth advertising signals.

The method also includes filtering the temporal sequence of

Field strength values (i.e. the field strength signal) to provide a filtered sequence of field strength values (i.e. a filtered field strength signal). The temporal sequence of field strength values (i.e. the field strength signal) can be filtered with at least one low-pass filter, in particular with an Infinit Impulse Response, IIR, filter. In this way, noise from the field strength signal can be suppressed in a reliable and efficient manner. The filtered

Field strength signal then shows in a precise and robust manner the time course of the distance between the Telestartsender and the receiving unit of the

Vehicle.

The method also includes determining, based on the filtered sequence of field strength values (i.e., based on the filtered field strength signal), whether or not the telestart transmitter was moved at a particular time. In particular, it can be determined whether the distance between the

Telestartsender and the receiving unit of the vehicle changed or changed over time. If this is the case, a movement of the telestart transmitter can be concluded. On the other hand, if the distance between the telestart transmitter and the receiving unit of the vehicle remains essentially constant over time (i.e. the filtered field strength signal remains essentially constant over time), it can be concluded that the

Telestart transmitter is not moved or was. Depending on whether the telestart transmitter is moved or not, the

Telestart transmitters can be put into an idle mode or into an operating mode. The telestart transmitter points to sleep mode

typically one (reduced compared to the operating mode)

Energy consumption. For example, the telestart transmitter in the

Sleep mode in relation to the access and / or activation system of the

Vehicle be limited to repeatedly sending radio signals. On the other hand, in the operating mode, the telestart transmitter can be set up to carry out a process for identity matching and / or for position matching with the vehicle (in order to enable access to the vehicle and / or activation of a function of the vehicle based on this).

In a corresponding manner, the vehicle can also be put into a sleep mode or into an operating mode with respect to the access and / or activation system. In the sleep mode, the vehicle can have a reduced energy consumption compared to the operating mode. For example, the vehicle in the sleep mode may be limited to the access and / or activation system described in this document

perform the described method for detecting the movement of the telestart transmitter. On the other hand, in the operating mode, the vehicle can be set up to carry out a process for identity matching and / or for position matching with the telestart transmitter (in order to access the vehicle and / or activate a function of the vehicle based on this)

enable).

The method may further include causing the telestart transmitter to exit sleep mode if it is determined that the telestart transmitter has been moved (and if it has previously been determined that the telestart transmitter is in sleep mode). For this purpose, a signal (in particular a request signal) from a transmission unit of the vehicle to the telestart transmitter be sent to put the telestart transmitter from sleep mode into the

To put operating mode.

On the other hand, the method may include causing the

Telestart transmitter is put into sleep mode if it is determined that the Telestart transmitter has not been moved for a minimum period of time (and if it has previously been determined that the Telestart transmitter is in the operating mode).

For this purpose, a signal can be sent from the transmitter unit of the vehicle to the telestart transmitter in order to put the telestart transmitter into the sleep mode.

The method may further include causing the vehicle to transition from an idle mode to an operational mode with respect to the access and / or activation system if it is determined that the

Telestartsender was moved, and / or that the vehicle in relation to the access and / or activation system from the operating mode in the

Sleep mode is entered when it is determined that the telestart transmitter has not been moved for a minimum period of time.

The method described thus enables the movement of the

Detect telestart transmitter of an access and / or activation system of a vehicle in an efficient and precise manner within the vehicle, and based on it the telestart transmitter in the sleep mode or in the

To put operating mode. In this way, the costs and the energy consumption of the telestart transmitter and thus of the access and / or activation system can be reduced.

As already explained above, a process for identity matching and / or for position matching between the vehicle and the telestart transmitter can be carried out when the telestart transmitter and the vehicle are in the operating mode. In this context, the procedure comprise, after determining that the telestart transmitter has been moved and / or after the telestart transmitter has been placed in the operating mode, emitting a plurality of request signals from a plurality of

Transmitting units of the vehicle to the telestart transmitter. The different transmission units of the vehicle can be arranged at different points of the vehicle.

The method may also include receiving one or more response signals from the telestart transmitter. The one or more response signals can include signal strength and / or transit time information in relation to signal strengths and / or transit times of the plurality of request signals, the signal strengths and / or transit times typically being based on that

Telestart transmitters were determined. On the basis of the signal strength and / or propagation time information, position information in relation to the position of the

Telestart transmitters are determined relative to the vehicle, e.g. by

Use of triangulation and / or trilateration methods. Location-dependent access and / or activation functions can thus be provided in an efficient, reliable and precise manner.

As already explained above, the temporal sequence of suffering levels (i.e. the signal strength signal) can be filtered with a lilter. In this case, the lilter can comprise a chain of N lilter modules which are connected in series in such a way that the output value of a lilter module is used as an input value for a directly following lilter module; with N> 1 (e.g. N = 2, 3, 4, 5 or more). A lilter module can include a low-pass filter as a partial filter (in particular an IIR low-pass filter). The values of the temporal sequence of levels of suffering (i.e., the leld strength signal) can be sequentially as

Input values of the first Lilter module in the chain of N Lilter modules can be used. Furthermore, the output values of the N lilter modules at a specific point in time can be at a value of the filtered sequence of

Suffering strength values (ie at a value of the filtered Leld strength signal) for the certain time can be combined, in particular by forming a weighted sum of the output values of the N filter modules. In this way, the noise of the field strength signal can be suppressed in a particularly reliable manner.

The method can include adapting at least one filter parameter of the filter as a function of the time sequence of field strength values (in particular as a function of a property of the field strength signal). Exemplary filter parameters are: the number N of filter modules; one or more weights to combine the output values of the N filter modules; and / or a partial filter used in a filter module. By adjusting one or more filter parameters, the quality of the

Noise reduction and the quality of motion detection can be further increased.

The method may include determining a reference value of the filtered sequence of field strength values. The reference value can e.g. be the average of the filtered field strength signal in a certain time window. The deviation of the value of the filtered sequence of field strength values for the specific point in time from the reference value can then be determined. Furthermore, it can be determined on the basis of the deviation whether the

Telestart transmitter was moved or not at the specific time.

In particular, it can be determined that the telestart transmitter has been moved if the deviation is greater than or equal to a deviation threshold.

Alternatively or in addition, the method can include determining a change over time in the values of the filtered sequence of field strength values over time. The change over time can include the time gradient of the filtered sequence of field strength values. It can then be determined on the basis of the change over time whether the telestart transmitter was moved at the particular point in time or not. In particular, can determine that the telestart transmitter was moved when the time change is greater than or equal to a change threshold.

The movement of the telestart transmitter can be detected in a reliable and robust manner by a threshold value comparison of the values of the filtered field strength signal.

According to a further aspect, a control unit for an access and / or activation system of a vehicle is described. The access and / or activation system comprises a telestart transmitter which is set up

(Repeatedly and / or periodically) to send out radio signals that can be received by a receiving unit of the vehicle. The control unit can be installed in the vehicle.

The control unit can be set up a time sequence of

To determine field strength values for a corresponding temporal sequence of radio signals received by the receiving unit. In addition, the control unit can be set up to filter the temporal sequence of field strength values in order to provide a filtered sequence of field strength values. Furthermore, the control unit can be set up to determine, based on the filtered sequence of field strength values, whether or not the telestart transmitter was moved at a specific point in time; and cause the telestart transmitter to exit sleep mode when it is determined that the telestart transmitter has been moved.

According to a further aspect, a (road) motor vehicle (in particular a passenger car or a fast car or a bus) is described which comprises the control unit described in this document.

According to a further aspect, an access and / or activation system for a vehicle is described which describes the one described in this document Control unit and includes the telestart transmitter described in this document.

According to a further aspect, a software (SW) program is described. The software program can be set up to be executed on a processor (e.g. on a control unit of a vehicle) and thereby to carry out the method described in this document.

According to a further aspect, a storage medium is described. The storage medium can comprise a software program which is set up to be executed on a processor and thereby to carry out the method described in this document.

It should be noted that the methods, devices and systems described in this document can be used both alone and in combination with other methods, devices and systems described in this document. Furthermore, any aspect of the methods, devices and systems described in this document can be combined with one another in a variety of ways. In particular, the features of the claims can be combined with one another in a variety of ways.

The invention is described in more detail below with the aid of exemplary embodiments. Show

Figure la an exemplary vehicle with an access and / or

Activation function;

Figure lb an exemplary telestart transmitter;

FIG. 2a shows an exemplary detection unit for detecting a movement of a telestart transmitter;

FIG. 2b shows an exemplary filter module for a detection unit;

FIG. 3 shows an exemplary temporal sequence of field strength values; and FIG. 4 shows a flow chart of an exemplary method for operating an access and / or activation system of a vehicle.

As stated at the beginning, the present document deals with the

Providing an energy and cost efficient access and / or

Activation system for a vehicle. FIG. 1 a shows an example vehicle 100 and FIG. 1 b shows an example telestart transmitter 120, which provide a keyless access and / or activation function or which together form an access and / or activation system. A keyless entry and / or activation function allows a driver of a vehicle 100 to open a vehicle door 110 and / or to start the engine of the vehicle 100 without using the key-lock principle. The driver reaches for the door handle 111 to open the door 110. A proximity sensor 112 on or in the vicinity of the door handle 111 detects this movement. A specific radio signal (for example in the LF, low frequency, range or with a Bluetooth low energy, BLE, or an ultra wideband (UWB) radio protocol) is then sent via one or more transmitter units 101 of the vehicle 100. This radio signal can also be referred to as a request signal. In other words, the one or more transmitter units 101 may be configured to transmit an electromagnetic signal, i.e. the request signal to send out. Exemplary transmission frequencies of the one or more transmission units 101 are in the

Frequency range from 20-140kHz (e.g. 20 kHz, 124kHz, 125kHz, 127 kHz, 133kHz or 135kHz). Alternatively, frequencies in the range of 2.4 GHz (e.g. when using BLE (Bluetooth Low Energy) or UWB (Ultra Wide Band)) can be used (to enable longer ranges and / or a higher accuracy of localization). Furthermore, BLE and / or UWB can advantageously be used in connection with smartphones as telestart transmitter 120.

The telestart transmitter 120 can be set up to receive request signals in the LF (low frequency) and / or in the UWB frequency range. A combined The ability to receive LF and UWB request signals can be advantageous, in particular with a radio key as the telestart transmitter 120.

As an alternative or in addition to the focalization of the telestart transmitter 120 in response to touching a door handle 111, the approach of a user to a vehicle 100 can already focalize the telestart transmitter 120

(in particular determining the position coordinate of the position of the

Trigger Telestartsenders 120 relative to the vehicle 100). In response to the focalization of the telestart transmitter 120, one or more functions can then be triggered and / or enabled.

The request signal transmitted by the one or more transmission units 101 can comprise several parts. A first part of the request signal can be designed to wake up a receiving unit 123 in a telestart transmitter 120 or to put it into an operating mode, i.e. prepare for receiving more information. Another part of the request signal can include information for the identification of the vehicle 100 and / or for the unique identification of the request signal. The different parts of the request signal sent by the one or more transmission units 101 can be transmitted with a time delay.

The receiving unit 123 in the telestart transmitter 120 is set up to receive the signals or signal parts sent by the one or more transmitting units 101 and to determine the signal strength or field strength and / or the propagation time of the signals or signal parts. A transmission unit 121 of the telestart transmitter 120 responds to the received request signal with a response signal. The response signal can be transmitted in a different frequency range than the one or more request signals. For example, the response signal can be transmitted with a response frequency of 433 MHz (ie in the HF (high frequency) range). Alternatively, frequencies in the range of 2.4 GHz (eg when using BFE) and / or in the range of UWB can be used. The response signal can consist of several parts. A first part of the response signal can be used to identify the telestart transmitter 120 (for example, an authentication key can be transmitted) and a further part of the response signal can include signal strength and / or transit time information relating to the measured signal strength and / or transit time of the request signal. One or more receiving units 104 of vehicle 100 can do this

Response signal and / or the response signal parts received and sent to one

Forward control unit 102 of vehicle 100.

The control unit 102 can be configured to check whether the

Telestart transmitter 120 fits vehicle 100. In particular, a

Authentication of the telestart transmitter 120 take place. Furthermore, the position of the telestart transmitter 120 relative to the vehicle 100 can be calculated via triangulation or trilateration or via a look-up table (on the basis of the measured signal strengths and / or transit times of a multiplicity of

Request signals). If the estimated position of the telestart transmitter 120 matches the position of the proximity sensor 112 (e.g. the surroundings of the touched door 110 and / or the touched door handle 111), the door 110 and / or the entire vehicle 100 are opened.

As shown in FIG. 1 a, the vehicle 100 typically comprises a multiplicity of transmission units 101. The transmission units 101 can be arranged at different locations (i.e. at different reference points) in the vehicle 100. Each transmission unit 101 of the plurality of transmission units 101 can be one

Send the request signal (e.g. a signal pulse). The request signals can be offset in time from one another and, if necessary, have a predefined sequence. Alternatively or additionally, the request signals can have a unique identifier or a unique identifier. The Telestartsender 120 and / or the receiving unit 104 of the vehicle 100 can by means of the

Identifier or the identifier and / or by means of the order Request signals unambiguously from one transmission unit 101 of the plurality of

Assign transmission units 101. The respective signal strength and / or transit time of the individual request signals and thus also the respective distance between transmitting unit 101 (i.e. reference point) and telestart transmitter 120 can thus be determined. Since the transmitter units 101 are located at different locations (i.e. at different reference points) in the vehicle 100, there are a large number of distances for the corresponding large number of transmitter units 101. Using triangulation or trilateration methods, this can be done

Relative position between vehicle 100 and telestart transmitter 120 can be determined.

The above-mentioned procedure for identity matching / position matching between vehicle 100 and telestart transmitter 120 typically takes about 100 ms. I.e. the above Due to the short period of time, the procedure typically remains unnoticed for the driver, so that the driver can open the door 110 directly with the handle to the door handle 111. An analogous procedure for identity comparison / position comparison typically also takes place when the engine 100 is started. Procedure for identity comparison and / or position comparison is typically associated with a relatively high energy consumption. In order to reduce the energy consumption, the telestart transmitter 120 and / or the vehicle 100 can be put into a power saving mode or sleep mode if it has been detected that the telestart transmitter 120 has not been moved for a certain minimum period of time. The above Identity matching procedure and / or

Positioning can be at least partially suspended as long as the telestart transmitter 120 and / or the vehicle 100 are in the sleep mode. In this way the energy consumption of the access and / or activation system can be reduced. The movement of the telestart transmitter 120 can be detected by means of a motion sensor installed in the telestart transmitter 120. However, installing and operating a motion sensor in a telestart transmitter 120 leads to increased costs and increased energy consumption for the telestart transmitter 120.

The telestart transmitter 120, in particular the transmitter unit 121 of the telestart transmitter 120, can be set up to repeatedly (e.g. periodically, approximately once per second or more frequently) send out radio signals (e.g. so-called Bluetooth advertising events or attention signals). The radio signals transmitted by the telestart transmitter 120 can be used by the vehicle 100, in particular by the control unit 102 of the vehicle 100, to detect a movement of the telestart transmitter 120. In particular, the time sequence of radio signals can be received by the receiving unit 104 of the vehicle 100. Furthermore, the control unit 102 of the vehicle 100 can determine the signal strength or the field strength value of the radio signals received by the reception unit 104, so that a temporal sequence of field strength values results. The temporal sequence of field strength values can be viewed as a field strength signal, the sampled values of the field strength signal corresponding to the field strength values.

FIG. 3 shows an exemplary time sequence 301 of field strength values (i.e. an exemplary field strength signal). As can be seen from FIG. 3, the field strength signal 301 has a relatively high noise component. For this reason, the time sequence 301 of field strength values can be filtered

(in particular, using a low pass filter) to determine a filtered sequence 303 of field strength values (i.e. a filtered field strength signal). The filtered sequence 303 of field strength values can then be used to generate a

Detect movement of the telestart transmitter 120. In particular, if the field strength values of the filtered field strength signal 303 are constant over time, it can be concluded that the telestart transmitter 120 is not moving. On the other hand If the field strength values of the filtered field strength signal 303 change, it can be concluded that the telestart transmitter 120 is moving (as is the case, for example, in the time intervals 304 in FIG. 3).

A movement of a telestart transmitter 120 can thus be detected directly in a vehicle 100 by means of repeated measurement of the field strength of incoming radio signals from the telestart transmitter (TS) 120. Since the reception field strength is typically disturbed by relatively strong noise, filtering is preferably carried out (as shown, for example, in FIGS. 2a and 2b).

The individual field strength values 201 of the sequence 301 from

Received field strength values can be sequential at the input of a

Detection unit 200 are provided. The received field strength values can be "Receive Signal Strength Indicator" (RSSI) values (e.g. of the Bluetooth LE standard). The detection unit 200 can have a chain or sequence of filter modules 202, wherein each filter module 202 can in particular comprise a low-pass filter. In particular, a filter module 202 can comprise the exponential moving average filter shown in FIG. 2b, which has a digital delay element T and a filter parameter a.

The output values of the individual filter modules 202 can be combined (in particular added) using a linear function, the individual ones

Initial values can be weighted with respective weights ß 203. In one example, all of the weights 203 except for the weight 203 of the

Output value of the last filter module 202 zero (and the weight 203 of the output value of the last filter module 202 one).

As can be seen from FIG. 3, due to the filtering, a filtered sequence 303 of field strength values can be determined even with relatively noisy field strength values, from which the movement of the telestart transmitter 120 can be determined more reliably Way can be detected. For this purpose, for example the time gradient of the filtered sequence 303 of field strength values can be compared with a gradient threshold value.

The concatenation of a plurality of Infinite Impulse Response (IIR) low-pass filters 202 enables maximum noise suppression with a minimum of digital memory. The one shown in Fig. 2b

Exponential moving average filter requires e.g. just a memory cell as a memory.

The overall filter function of the recognition unit 200 can be adjusted by adapting the number N of filter modules 202, by adapting the filter parameters a of the individual filter modules 202, by adapting the linear combination function (ie the weights β 203) and / or by selecting the threshold value of the Motion detector 204 of the detection unit 202 to different

Adjust noise sources.

The radio signals emitted by the TS 120 are optional, provided that a reception field strength can be calculated from them. For example, in the case of Bluetooth technology, the radio signals can be advertising packets which are transmitted over radio at periodic intervals. In general, the method described in this document can be used to detect the movement of Bluetooth, BFE, WiFi or otherwise from permitted Telestart transmitter 120. No (software and / or hardware) change to the telestart transmitter 120 is required.

FIG. 4 shows a flow chart of an exemplary method 400 for operating an access and / or activation system of a vehicle 100

Method 400 can be carried out, for example, by a control unit 102 of vehicle 100. The access and / or activation system comprises a telestart transmitter 120 (for example in the form of a vehicle key and / or a smartphone), which is set up (repeated and / or periodically) radio signals transmit, which can be received by a receiving unit 104 of the vehicle 100. The radio signals can be transmitted from a transmission unit 121 of the

Telestartsenders 120 are sent. The radio signals can e.g. Use frequencies for Bluetooth, BFE and / or Wifi. An exemplary radio signal is a Bluetooth advertising signal.

The method 400 comprises determining 401 a temporal sequence 301 of field strength values for a corresponding temporal sequence of radio signals that were received by the receiving unit 104. In particular, a field strength value (e.g. an RSSI value) can be determined for each received radio signal. The radio strength value shows the signal strength of the radio signal at the receiving unit 104. The signal strength and thus the radio strength value typically depend on the distance between the telestart transmitter 120 and the receiving unit 104 of the vehicle 100. The temporal development of the distance between the telestart transmitter 120 and the receiving unit 104 of the vehicle 100 can thus be determined on the basis of the temporal sequence 301 of field strength values.

The temporal sequence 301 of field strength values can be regarded as a field strength signal with a sequence of sample values, the frequency of the sample values typically matching the frequency of the radio signals received at the receiving unit 104. The field strength signal points

typically a relatively high level of noise. For this reason, method 400 may include filtering 402 temporal sequence 301 of FIG

Field strength values (i.e., the field strength signal) to provide a filtered sequence 303 of field strength values (i.e., a filtered field strength signal). The field strength signal can in particular be filtered with a low-pass filter (in particular with that in connection with FIGS. 2a and 2b

described filter). The filtered field strength signal shows the distance 302 between the telestart transmitter 120 and the in a robust and stable manner

Receiver unit 104 of the vehicle 100. The method 400 also includes determining 403, based on the filtered sequence 303 of field strength values, whether or not the telestart transmitter 120 was moved at a particular point in time. In particular, on the basis of the filtered sequence 303 of field strength values (ie on the basis of the filtered field strength signal) it can be checked in a robust manner whether the distance 302 between the telestart transmitter 120 and the receiving unit 104 of the vehicle 100 changes over time. If so (and none

Movement of the vehicle 100 takes place), it can be concluded from this that the telestart transmitter 120 is moved.

The method 400 may further include causing 404 the telestart transmitter 120 to exit sleep mode if it is determined that the telestart transmitter 120 has been moved. It can first be checked (e.g. based on the type and / or content of the radio signals received) whether the Telestartsender 120 is still in idle mode and / or whether the Telestartsender 120 is already in an operating mode (in which, for example, a process for Identity comparison and / or for position comparison with the vehicle 100 is carried out). If it is recognized that the telestart transmitter 120 is still in the idle mode, a signal (in particular by a request signal) to the telestart transmitter 120 can cause the

Telestartsender 120 is placed in the operating mode. Furthermore, the vehicle 100 can also be switched to the operating mode. An identity matching and / or position matching process may then be performed to provide an access and / or activation function of the vehicle 100.

By detecting the movement of the telestart transmitter 120 by means of a control unit 102 or a recognition unit 200 of the vehicle 100, the installation of a motion sensor in the telestart transmitter 120 can be dispensed with will. In this way, the energy consumption of the telestart transmitter 120 can also be reduced.

The present invention is not restricted to the exemplary embodiments shown. In particular, it should be noted that the description and the figures are only intended to illustrate the principle of the proposed methods, devices and systems.

Claims

Expectations

1) Method (400) for operating an access and / or activation system of a vehicle (100); wherein the access and / or activation system comprises a telestart transmitter (120) which is set up to transmit radio signals which can be received by a receiving unit (104) of the vehicle (100); the method (400) comprising

- determining (401) a temporal sequence (301) of field strength values for a corresponding temporal sequence of radio signals received by the receiving unit (104);

- filtering (402) the temporal sequence (301) of field strength values to provide a filtered sequence (303) of field strength values;

- Determine (403) based on the filtered sequence (303) of

Field strength values, whether the telestart transmitter (120) was moved at a particular point in time or not; and

- causing (404) the telestart transmitter (120) to exit a sleep mode if it is determined that the telestart transmitter (120) has been moved.

2) The method (400) according to claim 1, wherein

- The method (400) includes sending a signal from one

Transmitting unit (101) of the vehicle (100) to the telestart transmitter (120) to put the telestart transmitter (120) from the idle mode into an operating mode; and

- The telestart transmitter (120) in the operating mode is in particular set up to carry out a process for identity comparison and / or for position comparison with the vehicle (100).

3) Method (400) according to any one of the preceding claims, wherein

- The method (400) comprises causing the vehicle (100) in relation to the access and / or activation system from one Entering sleep mode into an operating mode when it is determined that the telestart transmitter (120) has been moved; and

- The vehicle (100) in particular in the operating mode

is set up to carry out a process for identity matching and / or for position matching with the telestart transmitter (120).

4) The method (400) according to any one of the preceding claims, the method (400) comprising, after determining that the telestart transmitter (120) has been moved,

- Sending a plurality of request signals from a plurality of transmission units (101) of the vehicle (100) to the telestart transmitter (120);

Receiving one or more response signals from the

Telestart transmitter (120); wherein the one or more response signals include signal strength and / or transit time information related to signal strengths and / or transit times of the plurality of request signals determined by the telestart transmitter (120); and

- Determining position information in relation to a position of the telestart transmitter (120) relative to the vehicle (100), based on the signal strength and / or transit time information.

5) method (400) according to any one of the preceding claims, wherein the method (400) comprises

- Determine, based on the temporal sequence (301) of

Levels of distress that the telestart transmitter (120) has not been moved for a minimum period; and

- in response, causing the telestart transmitter (120) to be placed in an idle mode; and / or causing the vehicle (100) to change from an operating mode to an access and / or activation system Is put into sleep mode.

6) Method (400) according to one of the preceding claims, wherein the temporal sequence (301) of field strength values with at least one

Low pass filter, in particular with an Infinit Impulse Response, IIR, filter is filtered.

7) Method (400) according to any one of the preceding claims, wherein

- The temporal sequence (301) of field strength values is filtered with a filter;

- The filter comprises a chain of N filter modules (202), which are connected in series in such a way that an output value of a filter module (202) is used as an input value for a filter module (202) immediately following; with N> 1;

- Values (201) of the temporal sequence (301) of field strength values

sequentially used as input values of a first filter module (202) of the chain of N filter modules (202); and

- The output values of the N filter modules (202) on the determined

Time can be combined to a value of the filtered sequence (303) of field strength values for the specific time, in particular by means of a weighted sum.

8) The method (400) according to claim 7, wherein

- The method (400) comprises adapting at least one

Filter parameters of the filter as a function of the temporal sequence (301) of field strength values; and

- The at least one filter parameter comprises one or more of:

- the number N of filter modules (202);

- One or more weights (203) to combine the

Output values of the N filter modules (202); and or

- A partial filter used in a filter module (202). 9) The method (400) according to one of the preceding claims, the method (400) comprising

- determining a reference value of the filtered sequence (303) of field strength values;

- determining a deviation of a value of the filtered sequence (303) from field strength values for the specific point in time from the reference value; and

- determining, based on the deviation, whether or not the telestart transmitter (120) was moved at the particular time; in particular determining that the telestart transmitter (120) has been moved if the deviation is greater than or equal to a deviation threshold.

10) The method (400) according to any one of the preceding claims, wherein the method (400) comprises

- determining a temporal change in the values of the filtered sequence (303) of field strength values with time; the temporal change in particular comprising a temporal gradient of the filtered sequence (303) of field strength values; and

- Determine, based on the change over time, whether the

Telestart transmitter (120) was moved or not at the particular time; in particular determining that the telestart transmitter (120) has been moved when the change over time is greater than or equal to a change threshold.

11) Method (400) according to one of the preceding claims, wherein

- The radio signal comprises a Bluetooth advertising signal; and or

- the radio signal periodically with a certain frequency,

in particular 0.1 Hz, 1 Hz or higher, is transmitted by the telestart transmitter (120). 12) control unit (102) for an access and / or activation system of a vehicle (100); wherein the access and / or activation system comprises a telestart transmitter (120) which is set up to transmit radio signals which can be received by a receiving unit (104) of the vehicle (100); the control unit (102) being set up,

- A temporal sequence (301) of field strength values for a

determine a corresponding temporal sequence of radio signals received by the receiving unit (104);

- filtering the temporal sequence (301) of field strength values to provide a filtered sequence (303) of field strength values;

- determine, based on the filtered sequence (303) of field strength values, whether or not the telestart transmitter (120) was moved at a specific point in time; and

- cause the telestart transmitter (120) to exit a sleep mode if it is determined that the telestart transmitter (120) has been moved.