WO2020099432A1 - Procédé et unité de commande servant à faire fonctionner un système d'accès et/ou d'activation d'un véhicule - Google Patents

Procédé et unité de commande servant à faire fonctionner un système d'accès et/ou d'activation d'un véhicule Download PDF

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Publication number
WO2020099432A1
WO2020099432A1 PCT/EP2019/081067 EP2019081067W WO2020099432A1 WO 2020099432 A1 WO2020099432 A1 WO 2020099432A1 EP 2019081067 W EP2019081067 W EP 2019081067W WO 2020099432 A1 WO2020099432 A1 WO 2020099432A1
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WO
WIPO (PCT)
Prior art keywords
telestart
transmitter
field strength
vehicle
strength values
Prior art date
Application number
PCT/EP2019/081067
Other languages
German (de)
English (en)
Inventor
Alexander Krebs
Alaa Mourad
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayerische Motoren Werke Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Publication of WO2020099432A1 publication Critical patent/WO2020099432A1/fr

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Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/40—Features of the power supply for the anti-theft system, e.g. anti-theft batteries, back-up power supply or means to save battery power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0251—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
    • H04W52/0254—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity detecting a user operation or a tactile contact or a motion of the device
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G07C2009/00365—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit
    • G07C2009/0038—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks in combination with a wake-up circuit whereby the wake-up circuit is situated in the keyless data carrier
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the invention relates to an access and / or activation system
  • 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.
  • 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
  • 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
  • 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.
  • 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.
  • the access and / or activation system includes one
  • Telestart transmitter e.g. a vehicle key and / or a smartphone
  • the radio signals can be sent by a transmission unit of the Telestart transmitter.
  • 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
  • a filtered sequence of field strength values i.e. a filtered field strength signal
  • the temporal sequence of field strength values 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.
  • IIR Infinit Impulse Response
  • 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 filtered sequence of field strength values (i.e., based on the filtered field strength signal).
  • 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
  • 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).
  • the vehicle can also be put into a sleep mode or into an operating mode with respect to the access and / or activation system.
  • the vehicle In the sleep mode, the vehicle can have a reduced energy consumption compared to the operating mode.
  • the vehicle in the sleep mode may be limited to the access and / or activation system described in this document
  • the vehicle in the operating mode, 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)
  • 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).
  • 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
  • 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).
  • 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.
  • 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
  • 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.
  • 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
  • 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
  • the temporal sequence of suffering levels can be filtered with a lilter.
  • 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
  • the values of the temporal sequence of levels of suffering 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
  • Suffering strength values 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.
  • 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.
  • the telestart transmitter has been moved if the deviation is greater than or equal to a deviation threshold.
  • 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.
  • a control unit for an access and / or activation system of a vehicle comprises a telestart transmitter which is set up
  • the control unit can be installed in the vehicle.
  • the control unit can be set up a time sequence of
  • 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.
  • a (road) motor vehicle in particular a passenger car or a fast car or a bus
  • a (road) motor vehicle which comprises the control unit described in this document.
  • an access and / or activation system for a vehicle which describes the one described in this document Control unit and includes the telestart transmitter described in this document.
  • SW software program
  • 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.
  • 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.
  • Figure la an exemplary vehicle with an access and / or
  • 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
  • FIG. 4 shows a flow chart of an exemplary method for operating an access and / or activation system of a vehicle.
  • FIG. 1 a shows an example vehicle 100
  • 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.
  • 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.
  • 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).
  • 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.
  • the approach of a user to a vehicle 100 can already focalize the telestart transmitter 120
  • Trigger Telestartsenders 120 relative to the vehicle 100.
  • 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.
  • the response signal can be transmitted with a response frequency of 433 MHz (ie in the HF (high frequency) range).
  • frequencies in the range of 2.4 GHz eg when using BFE
  • / 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
  • Forward control unit 102 of vehicle 100 forward control unit 102 of vehicle 100.
  • the control unit 102 can be configured to check whether the
  • Telestart transmitter 120 fits vehicle 100.
  • a vehicle 100 In particular, a
  • 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
  • the telestart transmitter 120 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.
  • the position of the proximity sensor 112 e.g. the surroundings of the touched door 110 and / or the touched door handle 111
  • 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
  • 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
  • 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.
  • 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.
  • a motion sensor installed in the telestart transmitter 120.
  • 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.
  • the time sequence of radio signals can be received by the receiving unit 104 of the vehicle 100.
  • 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).
  • 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
  • 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 received field strength values can be "Receive Signal Strength Indicator” (RSSI) values (e.g. of the Bluetooth LE standard).
  • RSSI Receiveive Signal Strength Indicator
  • 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.
  • 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
  • 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.
  • the time gradient of the filtered sequence 303 of field strength values can be compared with a gradient threshold value.
  • IIR Infinite Impulse Response
  • 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 ⁇ 203) and / or by selecting the threshold value of the Motion detector 204 of the detection unit 202 to different
  • the radio signals emitted by the TS 120 are optional, provided that a reception field strength can be calculated from them.
  • the radio signals can be advertising packets which are transmitted over radio at periodic intervals.
  • 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.
  • a field strength value e.g. an RSSI value
  • 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.
  • method 400 may include filtering 402 temporal sequence 301 of FIG.
  • Field strength values i.e., the field strength signal
  • 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
  • the filtered field strength signal shows the distance 302 between the telestart transmitter 120 and the in a robust and stable manner
  • 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
  • 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.
  • 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.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Selective Calling Equipment (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Lock And Its Accessories (AREA)

Abstract

L'invention concerne un procédé (400) servant à faire fonctionner un système d'accès et/ou un système d'activation d'un véhicule (100). Le système d'accès et/ou d'activation comprend un émetteur de démarrage à distance (120), qui est mis au point pour envoyer des signaux radio, qui peuvent être reçus par une unité de réception (104) du véhicule (100). Le procédé (400) comprend la détermination (401) d'une séquence (301) temporelle de valeurs d'intensité de champ pour une séquence temporelle correspondante de signaux radio, qui ont été reçus par l'unité de réception (104). Par ailleurs, le procédé (400) comprend le filtrage (402) de la séquence (301) temporelle de valeurs d'intensité de champ pour fournir une séquence filtrée (303) de valeurs d'intensité de champ. Le procédé (400) comprend par ailleurs la définition (403) sur la base de la séquence filtrée (303) de valeurs d'intensité de champ pour savoir si l'émetteur de démarrage à distance (120) a été déplacé ou non à un moment donné. En outre, le procédé (400) comprend le déclenchement (404) de la fin du mode de veille de l'émetteur de démarrage à distance (120) quand il est défini que l'émetteur de démarrage à distance (120) a été déplacé.
PCT/EP2019/081067 2018-11-13 2019-11-12 Procédé et unité de commande servant à faire fonctionner un système d'accès et/ou d'activation d'un véhicule WO2020099432A1 (fr)

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DE102018128379.2 2018-11-13
DE102018128379.2A DE102018128379A1 (de) 2018-11-13 2018-11-13 Verfahren und Steuereinheit zum Betrieb eines Zugangs- und/oder Aktivierungssystems eines Fahrzeugs

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