WO2005109699A1 - Free-hands access and control system for a motor vehicle functions - Google Patents

Free-hands access and control system for a motor vehicle functions

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Publication number
WO2005109699A1
WO2005109699A1 PCT/EP2005/051990 EP2005051990W WO2005109699A1 WO 2005109699 A1 WO2005109699 A1 WO 2005109699A1 EP 2005051990 W EP2005051990 W EP 2005051990W WO 2005109699 A1 WO2005109699 A1 WO 2005109699A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
badge
vehicle
means
system
motor vehicle
Prior art date
Application number
PCT/EP2005/051990
Other languages
French (fr)
Inventor
Ciprian Musat
Gilles Courjault
Eric Menard
Original Assignee
Valeo Securite Habitacle (Sas)
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

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20Means to switch the anti-theft system on or off
    • B60R25/2027Means to switch the anti-theft system on or off with data signals passing through the human body

Abstract

The invention relates to a free-hands system for controlling motor vehicle functions comprising at least one badge (4) and a monitoring system (6) mounted in the vehicle which exchange data for controlling actuators (40) in order to actuate the vehicle functions. The inventive system also comprises means (18, 48, 36) using a transmission channel by a current crossing a body for exchanging data between the badge (4) and the monitoring system in order to be sure that the initiator of the function control of the vehicle is an authorised badge-carrying user.

Description

Description ACCESS SYSTEM HANDS-FREE FEATURES AND CONTROL OF A MOTOR VEHICLE

[001] A "hands-free" access system, and control functions of a motor vehicle.

[002] An access system "hands-free" to a vehicle allows the user to access the vehicle without example to introduce and operate a mechanical key in a lock. Such a system also enables control of the functions of a motor vehicle as the start function and more. An access system "hands-free" has at least a badge and an embedded control system on board the motor vehicle. In this way, the wearer of the badge and the embedded control system exchange data in order to activate the vehicle functions as an unlocking doors of said vehicle.

[003] In the state of the art systems are known "hands-free" in which the embedded control system performs performs identification badge that appears in its area of ​​influence through radio frequency channels . If the badge is identified by its number, stored in a writeable memory, the embedded control system then activates means for enabling control of functions of the motor vehicle by the badge of the wearer.

[004] However, this state of the art two problems that can be disadvantageous.

[005] According to the first problem, there is no simple solution to ensure that the card is actually worn by a human carrier. This is particularly the case when the radio frequency tag of the prior art is left inside the vehicle. This is also the case when the badge is worn by a first person, but a second person as a child touches without authorization a control interface that only the first badge holder individual should be able to use. For a description of solutions to these problems, see in particular the document FR - A - 2838223.

[006] According to a second problem, contactless communications such as radio frequency channels on are subject to vagaries of transmission, as is the case when noise or interference is generated on the selected channel. There are technical solutions that reduce the risk of failure of the radio communications channel. Refer in particular to FR - A - 2839801.

[007] In another state of the art represented by the documents US - A - 4,591,854 it has been proposed to use a data transmission technique by current passing through the body or TTS (Transmission Through Skin English). A bodily object, such as a watch worn on the wrist, comprises a memory in which is registered in advance an identifier code. The latter can be transmitted from the watch to a receiver in connection for example with a computer. The body of the user serves as conductor for the current to flow between the two entities.

[008] The transmission of the code registered in the watch can not be established if the badge wearer's finger comes into contact with a conductive plate of the receiver associated with the computer.

[009] Unfortunately, such a signal transmission technology through the body is not adaptable to an access system "hands-free" for the reason that, of course, it would require the establishment of a physical contact between user and any embedded control system that would use when, conversely, the access system "hands-free" tends to avoid the contact.

[010] However, the inventor has realized that such transmission current through the body would ensure that the badge is worn by a person and that this guarantee would secure and make it more reliable access the vehicle and / or to control other vehicle functions in the context of the use of an access system "hands-free" for a motor vehicle.

[011] Indeed, the present invention provides a simple and usable solution in many circumstances to solve the above problems. It relates to an access system "hands-free" and / or function control of a motor vehicle of the type comprising at least one badge and a board control system on board the motor vehicle connected to at least one control device access and / or function of the vehicle. According to the invention, such a system comprises means implementing a current transmission channel through the body for the exchange of data in the form of current, between the badge and the control system to ensure that the initiator of the control functions of the motor vehicle is a user wearing the badge.

[012] According to another aspect of the invention, the means implementing a current transmission channel passing through the body comprises a TTS communication means on the vehicle comprising a conductive plate disposed within a housing associated with at least one opening the motor vehicle and / or a start button of the motor vehicle, which one electrode is connected to a reception path and to means for detecting an identification signal transmitted by a conducting plate on the badge in order to detect the presence of wearer's badge when a command or function on the vehicle are activated.

[013] According to another aspect of the invention, the system also comprises means for implementing a low-frequency transmission channel for the activation of the badge in a region (Zone_l) near the motor vehicle or in an area (Zone_2) of the passenger compartment of the motor vehicle which cooperates with the TTS transmission channel to detect the presence of the wearer of the badge when a command or function on the vehicle are activated.

[014] According to another aspect of the invention, the system also includes means to implement a radio frequency transmission channel for the identification of the badge, for detecting the presence of the wearer of the badge when a command or a function of the vehicle are activated.

[015] According to another aspect of the invention, the system also comprises means for detecting an approach of an object with a PSU device (proximity sensor unit), associated with at least one opening of the motor vehicle and / or a start button of the motor vehicle to activate the control system cooperating with the means of communication by current passing through the body to detect the presence of the wearer of the badge when a command or function on the vehicle are activated.

[016] According to another aspect of the invention, the means for detecting an approach of an object comprise at least one capacitive sensor (put aussiet / or the infra red red sensors which are Valeo products) for detecting an approach of an object with said device PSU for detecting a function control for the motor vehicle as an unlocking of the doors of said vehicle which cooperates with the means of communication by current passing through the body to detect the presence of the badge holder when a command or function on the vehicle are activated.

[017] According to another aspect of the invention, the means for detecting an approach of an object comprise at least one capacitive and / or associated to the infrared start button of the motor vehicle sensor for detecting an approach of an object PSU with said device for detecting a start command for the motor vehicle which cooperates with the means of communication by current passing through the body to detect the presence of the wearer of the badge when a command or function on the vehicle are activated.

[018] According to another aspect of the invention, the system comprises means for detecting a contact of an object with a PSU device for detecting a function control for the motor vehicle as an automatic locking of the vehicle opening automobile, which cooperate with the current communication means through the body to detect the presence of the wearer of the badge when a command or function on the vehicle are activated.

[019] According to another aspect of the invention, the means implementing a current transmission channel passing through the body are means implementing a bidirectional transmission path between the badge and the embedded control system to ensure the initiator of the control functions of the motor vehicle is an authorized user carrying the badge.

[020] According to another aspect of the invention, the onboard control system cooperates with at least one conductive electrode plate radiofrequency field emission for the activation of the badge detection by the communication channel by current passing through the body badge receiving, said electrode plate (plate is unnecessarily restrictive me apparently) conductor being disposed in relation to the vehicle as a vehicle door, in particular on a device associated with a vehicle roof and / or function control member of the vehicle as the starting device of the powertrain.

[021] According to another aspect of the invention, the badge has a conductive plate transmission-reception of modulated identification signal and of the badge of the control system connected to the means implementing the current through the body.

[022] According to another aspect of the invention, the badge comprises alarm means for the badge coupled with a remote reception channel of a wakeup radio frequency wave badge produced under the control of the onboard control system.

[023] According to another aspect of the invention, the badge has and / or the embedded control system cooperates with a wave characteristics comparing means for distinguishing a type of contact TTS communication by current passing through the body with an electrode plate and a conductive TTS current transmission by communication through the remote body.

[024] Thus, the system according to the invention makes it possible to detect when there is contact with the detection circuit board of the embedded control system, by the apprehension of a phase inversion of the received signal.

[025] Therefore, according to the invention, when the system detects a phase inversion and amplitude jump of the received signal it indicates that the user arrives / comes into contact with the conductive plate, whereas if the system detects a phase inversion and decrease in amplitude of the received signal, this indicates that the user releases / departs from the contact with the conductive plate.

[026] The invention will be better understood and other objects, features, details and advantages thereof appear more clearly in the explanatory description which follows with reference to the accompanying drawings wherein: - Figure 1 shows an example cutting areas of location of a badge for a hands-free system of a motor vehicle function control; - Figure 2 illustrates schematically an embodiment of the device according to the invention; - Figure 3 schematically illustrates the means implementing a current transmission channel passing through the body; - Figure 4 illustrates in flowchart form the operation of a handsfree system according to the requirements of the invention; - Figure 5 schematically illustrates an alternative embodiment of a handsfree system according to the requirements of the invention; - Figure 6 schematically illustrates a second alternative embodiment of a handsfree system according to the requirements of the invention.

[027] First is described a number of drawbacks and problems encountered in the operation of an access system "hands-free" according to the preamble of the main claim.

[028] In another known embodiment, the access system "hands-free" may include means to detect the approach of an object, particularly the hand of a user, with one positioned handles on each opening of the motor vehicle or the start button disposed at the vehicle driver's seat. Particularly, such means comprise a first capacitive sensor for developing an electrical signal including at least one parameter (amplitude or phase) changes according to the distance between the capacitive sensor of an approaching object. The electrical signal from the capacitive sensor is designed firstly to activate the hands-free system and secondly detecting a command for a function. For example, the approach of the hand of the user to the door handle is in- <terprétée by the identification system as an approach of a user and as reflecting an intention opening of the opening concerned of the motor vehicle.

[029] In this case, there are many situations in which the electrical signal representative of the capacitive sensor of an approach can be triggered wrongfully by a jet of water in a car wash, the passage of a pedestrian , a leaf ... because the hands-free system can not distinguish false alarms.

[030] In another known embodiment, the hands-free system further comprises means for detecting contact of an object, particularly a hand of a user, with a handle arranged on each door of the vehicle automobile or the start button of the motor vehicle. Particularly, such means comprise a second switch or a capacitive sensor whose capacitance varies in contact with an object with a handle of an opening or the start button. The second capacitive sensor is mainly for detecting an automatic locking intent. For example, when the user touches a door handle, the value of the capacitance of the second capacitive sensor changes and becomes a contact characteristic. The identification system interprets this change in capacitance value as an automatic locking intent when as, for example, the driver is released from an inner control zone to the vehicle.

[031] As in the previous case, it is impossible to guarantee in this state of the art that the action that produces the activation of the electrical detection signal is caused by the usual user who can give real lock command.

[032] In another known embodiment, the embedded part in the vehicle hands-free system comprises means for transmitting an interrogation signal is low-frequency, typically 125 kHz, or by high frequency, typically 433 MHz. The response signal by the badge is issued the high-frequency at 433 MHz.

[033] In the state of the art, prior to execution of one of the aforementioned functions of access to the vehicle or vehicle control function such as starting of the drive train, the identification system is activated when the first capacitive sensor detects the approach of an object.

[034] The identification system then transmits the RF signals to wake up or activate the badge. Indeed, the various means constituting the badge are not constantly activated to limit energy consumption.

[035] The card then responds to the identification system to a radio frequency signal to confirm its presence in a zone near the motor vehicle or in the cabin, its identifier code and its activation (or wake-up). The identification system then compares the received data with its own data in memory, in order to authorize or not the control functions of the motor vehicle.

[036] Then, the radio frequency identification data system interprets received as the badge of locating and detecting the approach of an object with a door handle or the start button to detect a function control intention. In the prior art, for controlling a function of the motor vehicle, the hands-free system, at first, detects a control intention on the part of the user, badge holder, such as unlocking the doors or the safe, voluntary lock or starting the motor vehicle.

[037] For example, the location of the badge close to the motor vehicle and the detection of the approach of an object with the handle of the trunk are interpreted by the identification system as an intention of unlocking the trunk.

[038] Finally, the identification system then control, if the card identifier code is confirmed, the necessary actuators implementing the desired function by the user as unlocking the doors.

[039] A disadvantage of this prior art is that the radiofrequency signals exchanged between the identification system and the badge may be affected by the radio frequency noise making inoperative the handsfree system.

[040] Another disadvantage of this prior art is an unintentional unlocking of the doors of the motor vehicle by an unauthorized person. Particularly, the badge wearer can be located in an area near the vehicle, in which case the badge will be identifiable. An unauthorized person, ie without the badge, and can unlock the doors by operating a handle of a door of the motor vehicle.

[041] Another drawback of this state of the art is that the hands-free system can be easily hacked. In fact, knowledge of the shape of the radiofrequency signals exchanged between the card and the identification system, it would be possible to produce the required RF signals to unlocking of the doors of the motor vehicle and starting the motor vehicle. An intruder could then enter the vehicle and thus steal.

[042] Another disadvantage of this prior art is an involuntary release in the presence of external disturbances. Indeed, the first capacitive sensor for detecting an approach is sensitive to external disturbances produced in particular by the water when it is raining or when automatic washing, etc. In such a situation, if the badge holder is located in the motor vehicle, the hands-free system having identified the presence of the badge close to the trunk, may permit unlocking of the safe. When it is powered, it opens automatically. This situation is of course very difficult.

[043] Another disadvantage of this prior art is an unintentional locking of the doors of the motor vehicle. This situation may occur when the card is in a zone of ambiguity, i.e. the overlap zones between the location area in the passenger compartment and the location area outside the vehicle. The hands-free system may fail to distinguish one of these areas and can therefore lock the vehicle while the badge is still present in the cockpit.

[044] Another disadvantage of this prior art is unintentional starting of the motor vehicle. For example, the driver is not in the cockpit and the badge is in the cockpit. A passenger, as a child can start the vehicle. Thus, as the badge is present in the cockpit, an unauthorized person can start the vehicle.

[045] The inventor has discovered that the disadvantages of the prior art result or the function of control by an unauthorized person or an external disturbance.

[046] The inventor realized that it would be very advantageous to integrate a device current hands-free systems that would ensure that the initiator of the control functions is an authorized person, c 'ie a user wearing the badge on him. Only the means used in current hands-free systems, such as radio frequency means and different capacitive sensors do not allow the realization of such a system.

[047] In another state of the art has already described devices using a transmission by current signals passing through the body TTS (acronym for Transmission Through Skin). Generally such devices are used to allow access to a workpiece, such as a hotel room, or a safe by an authorized person carries an electronic circuit generating the current through the body. However, the devices implementing such transmission are permanently active and consume a lot of energy.

[048] The inventor had the idea not only to integrate a transmission current through the body to current hands-free systems for motor vehicles but also to activate the means implementing the TTS transmission only when the system handsfree must ensure that the badge is worn by a person authorized to limit energy consumption. The access system "hands-free" of the invention includes activation means to wake up the electronics of the badge.

[049] Figure 1 shows an embodiment of an access system "hands-free" embodying the invention. The access system "hands-free" thus mainly comprises an embedded control system and at least one badge. The card is carried by a driver who is present close to the embedded control system in the vehicle V. If the access system is built on the basis of a radiofrequency system, as has already recalled above, in the exemplary embodiment, the embedded control system is connected to at least three types of antennas: • a first type of low-frequency transmission antenna BF posted on a plate associated with each vehicle door; • A second type of low-frequency antenna BF posted near the starting device of the vehicle, to the driving position; • A third type of high-frequency antenna HF posted by exemplesur the roof or on the associated vehicle roof antenna.

[050] The access system "hands-free" in this embodiment of the invention essentially comprises: - an on-board control system 6 on board the vehicle V; - at least one badge 4 intended to be worn by an authorized user.

[051] The badge 4 of the invention is usually a small plate, the kind of a credit card or a little thicker casing. The card 4 comprises in a first embodiment of the access "hands-free" system of the invention only are arranged in the TTS badge communication means implementing the currents through badge wearer's body, and will be described later.

[052] In other embodiments of the access system "hands-free" of the invention, the card 4 also comprises RF radio frequency communication means for dialogue with the onboard control system 6 and cooperate with the media TTS badge 4 as will be described later.

[053] The onboard control system 6 is connected by means known to specific devices that are of three types: - approach of detection devices and / or remote control, for example based on a high frequency antenna HF; - PSU devices related to access functions in the vehicle interior and most often associated with opening the vehicle door as a PI to P4 and a rear boot C; - DEM devices related to specific functions to the vehicle as the start function of the powertrain.

[054] For the sake of simplicity, there is shown one PSU type device attached to the PI door and connected by an electrical connection 6-1 to 6 control system on board the vehicle V. However, preferably, each opening P2, P3, P4 and C has its own PSU device that is connected by a cognate binding .6-2, 6-3, 6-4, 6-C and 6 control system.

[055] PSU-type devices comprise means by which the badge wearer can intervene on manual control interfaces such as a capacitive sensor or infrared or switch for triggering locking or unlocking of the doors. More generally, they have sensors that can detect an approach or an intention to activate a function of the vehicle.

[056] In a first embodiment, which will be detailed later, the access system "hands-free" of the invention may contain only PSU type devices associated with opening the vehicle V. Each device or unit PSU associated with an opening PI, P2, P3, P4 or C of the vehicle V also then comprises means TTS not shown in Figure 1 that allow for dialogue between the card 4 and the board control system 6 on the single channel TTS.

[057] In a second embodiment, wherein badge 4 and embedded control system 6 include and / or cooperate with radiofrequency means, access "hands-free" system can distinguish three types of nearby areas motor vehicle V: - a type of Zone_l area for which the cardholder will be located remote from the vehicle, i.e. it will be determined as being in a phase of approach or removal of the motor vehicle V using the HF approach detection device; - A type of Zone_2 area for which the cardholder will be located in the passenger compartment of the motor vehicle, particularly an area near the driver's position, especially by a DEM device type; - A type of Zone_Z3 area especially near doors PI to P4 and the trunk C using a PSU device type.

[058] It is noted that each of the three types of areas have overlapping areas or ambiguity, particularly the area shown in the drawing where Zone_l and Zone_2 areas overlap or are superposed. Indeed, the area Zone_2 not strictly delimited by the interior of the motor vehicle, it may appear overflow phenomena such area.

[059] The Zone_l and Zone_2 fields are reserved for exchange of radio frequency data between a badge 4 and 6 Control system on board the motor vehicle V. The exchange of radio frequency data allows the following functions: - activation of the badge 4; - the badge 4 Identification; - location of the badge 4.

[060] Referring now to Figure 2 wherein is shown an illustrative embodiment of the second embodiment of the invention wherein radiofrequency cooperate and TTS means means implementing the currents through the body of the wearer badge 4 are detailed. To help achieve a system according to the first embodiment of the invention, the skilled artisan can remove most of the resources used in radio frequency communications.

[061] To implement a radio frequency channel, the control system 6 comprises means 22, 24, 26 for emitting low-frequency signals, particularly a low-frequency transmission antenna 22 that emits in the Zone_l area, low-frequency transmission antenna 24 that emits in the Zone_2 area and a processing unit 26 of the low-frequency signals to be transmitted.

[062] The control system 6 further comprises means 28, 30 for receiving high-frequency signals, especially high-frequency receiving antenna 30 and a processing unit 28 of the high-frequency received signals.

[063] The badge 4 includes means 8, 12 for receiving low-frequency signals from the control system 6, particularly a low-frequency antenna 8 and a processing unit 12 of the low-frequency signals emitted by the system 6 control.

[064] The button 4 comprises means 10, 14 for transmitting high-frequency signals to the control system 6, particularly a high-frequency antenna 10 and a processing unit 14 of the high-frequency signals to be transmitted.

[065] Once the 6 control system activated according to the methods listed later in the description, the low-frequency antennas 22 and 24 periodically emit low-frequency signals respectively in Zone_l and Zone_2 areas.

[066] The low-frequency signals are transmitted by a LF antenna associated with the vehicle and powered by a suitable modulator control system 6. They carry data comprising an identifier code of the control system 6, as appropriate, an identifier code badge 4 and the useful part of the transmission, by a given activation (or wake) of the badge 4.

[067] The button 4 comprises as is known a power source (not shown) and an electronic processor 16. The processor 16 of the badge 4 manages communications both TTS means that RF means when they are im- plémentés. In order to limit its energy consumption, the processor places the card 4 in a mode called "standby" where it is only able to receive the poultry-frequency signals emitted by the control system 6. The "sleep" mode is activated 4 when the badge is no longer located in the zones and Zone_l Zone_2 or when the user no longer manually control the badge 4, particularly when the latter comprises a vehicle functions remote user interface.

[068] After receiving the low-frequency signals, the processor or processing unit 16 of the card 4 compares the control system identifier code 6 with a reference value contained in a badge memory 6 4. If the control system is recognized by the processing unit 16, the tag 4 sends an acknowledgment signal to the high-frequency control system 6 for notifying the activation. The high-frequency signal including acknowledgment carries data including an identifier code of the badge 4, optionally the identifier code of the 6 control system and the message itself, i.e. the acknowledgment (or confirmation) activation badge 4.

[069] The button 4 is thus activated and the embedded control system 6 has identified. To keep the badge 4 in an activated state, the button 4 is located periodically by RF means associated with the 6-board control system to ensure that it is always in one of Zone_l areas for which Zone_3 badge 4 activation is of interest, particularly for controlling functions of the motor vehicle.

[070] Thus, the control system 6 periodically transmits maintenance low-frequency signals to the badge 4 intended to interrogate the card 4 to ensure its presence in one of the zones.

[071] The non-reception of a high-frequency signal of confirmation of presence, beyond a predetermined time interval, is interpreted by the control system 6 as an output of the badge and Zone_l Zone_2 areas. The button 4 is thus deactivated. [072] The location of the badge 4 therefore keeps the badge 4 in an activated state and improve the detection function control intention. [073] Figure 2 schematically illustrates an embodiment of an access system 2 comprising a badge 4, a control system 6 and a PSU device 50. [074] Particularly, the PSU 50 device is associated with a handle door or trunk or the start button located in the vehicle cab. [075] Thus, according to the embodiment described in FIG 1, the access system 2 includes a PSU device 50 for each gate PI, P2, P3, P4, to the trunk C and for the start button DEM ( see Figure 1). [076] The PSU device 50 comprises a detecting means, such as a conductive plate 48, a modulated identification signal transmitted by the card 4 via the transmission channel by current passing through the body. [077] The PSU 50 includes means device as a first capacitive proximity sensor 44 for detecting an approach of an object, particularly a hand of a user, with said device PSU 50. The value of the capacitance of the capacitive sensor 44 proximity is variable and varies the distance between the object of the pe-. riphérique PSU 50. [078] The PSU 50 includes means device as a second capacitive sensor 46 of contact for detecting contact of an object, particularly a hand of a user, with said device PSU 50. The value of the capacitance the capacitive sensor 46 of contact is variable and takes discrete values, in case of contact and another in the event of non-contact. [079] The button 4 comprises: - means (8,12) for receiving low-frequency transmitted by the control system 6 of the type low-frequency receiving antenna 8 and a low-frequency signal processing unit signals 12; - means (10,14) for transmitting high-frequency signals to the control system 6 of the type high-frequency transmission antenna 10 and a signal processing unit 14 high-frequency; - means 20, as a conductive plate, for the implementation of the detection of proximity and contact with the PSU 50. The peripheral conductive plate generates a change in the value of the capacitance of the capacitive sensors when the distance which the separates from the peripheral PSU 50 decreases; - a processing unit TTS-Badge 18 modulated identification signal to be transmitted to the control system 6 via a transmission channel by current passing through the body, said unit having a conductive plate (not shown) and modulating means ( not shown); - a processor or control unit and controller 16 for monitoring and controlling the badge 4.

[080] The control system 6 comprises: - means (28,30) for receiving high-frequency emitted by the badge 4 type high-frequency receiving antenna 28 and a high-frequency signal processing unit signals 30; - means (22,24,26) for emitting low-frequency information to the badge 4 type low-frequency transmission antenna signals 24 into the passenger compartment, a low-frequency transmission antenna 22 in an outer region close to the motor vehicle and a signal processing unit 26 Lower frequencies; - a detection unit 34 for the implementation of the detection of proximity and contact with the PSU device 50. According to the measured capacitance values ​​of the capacitive sensors 44 and 46, the detection unit 34 is adapted to determine namely if an object is near or in contact with the PSU 50 device; - a processing unit access TTS-36 modulated signals transmitted by the card 4 via the transmission channel by current passing through the body, said unit including demodulating means (not shown); - a control and command unit 32 for monitoring and controlling the control system 6; - a microcontroller 38 for controlling the means 40 such actuators to unlock the various openings of the vehicle, means for locking the openings of the vehicle and means to start the vehicle.

[081] In one embodiment, the low-frequency antennas 22 and 24 are replaced by low-frequency antennas, each associated with a PSU device 50. Thus, the low-frequency antenna associated with opening PI, P2, P3 , P4, C to turn on the button 4 in the vicinity of the motor vehicle, especially to an opening, and the low-frequency antenna associated with the start button to activate the button 4 in the passenger compartment of the motor vehicle.

[082] will now be explained briefly with reference to Figure 3, the constitution of the communication channel currents through the body. A badge 4 according to the invention comprises the already known resources for establishing the two radio frequency communication channels. The badge 4 of the invention then comprises at least one electrode preferably in the form of a conductive plate 58 intended to come into contact with a body part of the person wearing the badge 4, for example when the card is held in the hand or when it is placed in a pocket of a garment worn by the cardholder. The conductive plate 58 is inside the badge 4 connected to the output of a modulation circuit 54.56 which continuously produces a modulation signal established on the basis of a local carrier for example sinusoidal with a frequency between 5 and 100 kHz and on the basis of identification codes read from an integrated memory MEM of the badge register 4. of course, the present invention does not require that the button 4 is made into a single object. 11 may comprise several separate objects, for example if the button portion 4 implements the communication resource by currents passing through the body is incorporated into another object in contact with the body. [083] When the cardholder places his hand or finger on an electrode or conductive plate 48 associated with the device PSU 50, a current through the body is established between the conductive plate 58 of the card 4 and the conductive plate 48 associated PSU device 50. This current flowing through the body carries the modulation signal generated by the card 4 which is then received on a TTS-access processing unit 36, integrated with the control system 6 on board the vehicle. Such processing unit TTS-port 36 comprises a detection circuit 62 whose input is connected to the conductive plate 48 associated with the PSU 50 device and whose output is connected to a demodulation circuit 64 which extracts the code word identification which is then supplied to a first input of a comparator 66 codewords whose other input is connected to a memory 11 a drop authorized code table, particularly the different identifier codes of authorized cards. If the comparison is positive, the TTS-access processing unit 36 ​​to the control unit and control 32 provides a signal identifying the badge 4 detected and identifying the area, namely the area Zone_l or Zone_2 area, wherein the cardholder 4 was detected as physically touching a portion of the vehicle. [084] Figure 4 illustrates in flowchart form the operation of a hands-free system 2 according to the requirements of the invention. [085] In a first step, the active hands-free system 2. The activation of the hands-free system 2 comprises: - a recovery step of the control system 6 by detecting an approach (or proximity) of a object, particularly a user's hand, with one of the housings 50. the proximity detection with the PSU 50 device is performed when the value of the capacitance of the first capacitive proximity sensor 44 becomes a characteristic close with said PSU device 50. the detection unit 34 compares the value of the measured capacitance with a reference threshold. When this value becomes greater than the threshold, the detection unit The unit 34 interprets it as a proximity detection and outputs a signal representative of a proximity detection to the control and command unit 32 which activates means (28,30) implementing the radio frequency transmission. Of course, the threshold is defined depending on the sensitivity that is desired to give to the capacitive sensor. - a recovery step of the badge 4 by transmitting low-frequency signals to the card 4 via the low-frequency antenna 22 or the low-frequency antenna 24, said signals being of the type having data typecomportant the identifier code 4 badge, the ID code of the control system 6 and the object signal namely the alarm (or activation) of the button 4; - a step in acknowledgment (confirmation) of the activation button 4 which transmits to the control system 6 via the high-frequency antenna 10 a high-frequency signal comprising in particular data type identifier of the badge code 4 for to be recognized by the control system 6.

[086] Of course, if the control system 6 does not recognize the identity of badge 4, the control system 6 prohibits any control functions of the motor vehicle.

[087] As discussed above, The control system 6 also maintains the badge 4 in an activated state by transmitting to the card 4 for maintenance poultry-frequency signals to which the badge 4 responds by transmitting signals of high - confirmation frequency of its presence in the area Zone_l or Zone_2 area.

[088] Thus, this first step has a function not only the activation of the hands-free system 2, but also identification badge 4 and maintaining the badge 4 in an activated state by monitoring the location of the badge 4.

[089] In a second step, the hands-free system 2 detects a command for a function of the motor vehicle as unlocking doors, unlock the safe, voluntary locking of the vehicle opening and starting the vehicle.

[090] Particularly, the detection unit 34 for the implementation of the detection of proximity and contact with a PSU device 50 comprises means for detecting which of the capacitive sensors 44 proximity is responsible for detecting an approach of an object, particularly the hand of a user, with to one of the housings 50.

[091] Thus, when the detection unit 34 detects that a capacitive sensor 44 close, disposed in one of the 50 PI doors housings, P2, P3 or P4, is responsible for detection, it transmits to the control unit and control 32 a signal representative of an unlocking for doors of the motor vehicle.

[092] When the detection unit 34 detects that the capacitive sensor 44, disposed in the peripheral PSU 50 of the trunk C, is responsible for detection, it transmits to the control unit and control 32 a signal representative of an unlocking for the trunk of the motor vehicle.

[093] When the detection unit 34 detects a capacitive proximity sensor 44 disposed in the peripheral PSU 50 of the start button, is responsible for detection, it transmits to the control unit and control 32 a signal representative of a start for the motor vehicle.

[094] To detect an autolock intention, the hands-free system 2 comprises means (not shown) for detecting the opening and closing an opening of the motor vehicle of the type door, and means (not shown) for detecting the badge wearer's passage 4 of the Zone_2 Zone_l zone to the zone for detecting the output of the wearer's badge 4 of the passenger compartment. Thus, the simultaneous detection of opening and closing an opening element and the badge wearer's transition from one zone to another is to be interpreted as an automatic locking intent. In addition, to confirm the intention of automatic locking, the control system 6 detects a contact of an object, particularly the hand of the user, with the PSU device 50 of one of the doors PI, P2, P3, P4 via the second capacitive touch sensor 46. the detection unit 34 compares the value of the capacitance of the capacitive sensor 46 of contact with a reference value characteristic of a contact.

[095] If the contact of an object with the PSU 50 device is not detected, the control system 6 gives up the automatic locking. The location of the badge 4 allows more invalidate or confirm the intention of a control function.

[096] In a third step, the 6 control system activates the means 18, 48, 36 implementing the transmission channel by current passing through the body in order to ensure that the initiator of the vehicle function control is the bearer of the badge 4, ie an authorized person.

[097] Advantageously, when approach of an object with the PSU device 50 is detected and an error has occurred during the exchange of radio frequency signals, such as low-frequency signals from the control system 6 and / or high-frequency signals transmitted by the badge 4 during the first step, the 6 control system activates automatically the means 18, 48, 36 embodying the transmission current through the body. The radio frequency noise is generally responsible of an error in the exchange of radio frequency data for localization and / or identification badge 4.

[098] The transmission current through the body can not be established if the conductive plate of the card 4 and the conductive plate 6 control system are simultaneously in contact with a body part of the user badge wearer. [099] The purpose of this exchange is the identification of the badge 4 by the control system 6. The modulated identification signal from the badge 4 thus comprises data typecomportant the identifier code of the card 4, the identifier code the control system 6 and the object signals namely identification.

[100] The control system 6 compares the badge identifier code 4 to a reference value contained in a memory to ensure that the received ID code matches a known code and therefore to ensure that the initiator the control function is the bearer of the badge 4, ie an authorized person.

[101] An interruption in the transmission and control system 6 prohibits the control of vehicle functions until a new attempt of the user.

[102] Of course, if the card identifier code 4 is not recognized by the control system 6, the control system 6 prohibits the control of vehicle functions.

[103] In a fourth step, the control system 6 controls the function in the motor vehicle. Specifically, the control unit 32 and control outputs to the microcontroller 38 a signal representative of the detected function control. The microcontroller 38 then controls the actuators 40 is adapted to the locking or unlocking of the doors or the trunk release or is at starting the vehicle.

[104] Advantageously, the RF signals exchanged between the card 4 and 6 the control system are encrypted in order to enhance protection against hackers.

[105] We will now describe two embodiments of a hands-free system using a transmission channel by the current through the body to ensure that the initiator of the control functions of the motor vehicle is an authorized person.

[106] In a first embodiment, the invention provides a hands-free system 70, shown in Figure 5, identical to that described above except that it does not include the means for the implementation of a high-frequency transmission channel between a button 72 and a control system 74.

[107] Therefore, the exchange of radio frequency signals between the card 72 and the control system 74 only has the function identification badge 72 and maintenance (or continuation) of the badge 72 in an activated state. Specifically, the radio frequency transmitted by the control system 74 signals have only to function to wake (or enable) the card 72 when the badge holder enters one of Zone_l or Zone_2 areas.

[108] Thus, only TTS means current transmission through the body allow the identification of the badge 72, in addition to their primary function.

[109] The hands-free system further comprises a housing at identical 102-104-106 riphérique pe- PSU 50 described in Figure 2. [110] The casing 102-104-106 as well comprises: - a first capacitive sensor near 102; - a second capacitive sensor contact 104; - a detection circuit board 106. [11 1] The badge 72 includes: - means (76,78) for receiving low-frequency signals emitted by the control system 74 of the type low-frequency receiving antenna 78 and a low frequency signal processing unit 76; - means 82, such as a conductive plate, for the implementation of the detection of proximity and contact with the casing 102-104-106. The conductive plate generates a change in the value of the capacitance of the capacitive sensors when the distance separating the casing 102-104-106 decreases; - a TTS-badge processing unit 80 of modulated signals to be transmitted to the control system 74 via a transmission channel by current passing through the body, said unit having a conductive plate (not shown) and modulating means (not shown) ; - a control and command unit 84 for monitoring and controlling the badge 72.

[112] The control system 74 comprises: - means (86,88,90) for transmitting low-frequency signals to the card 72 of the type a low frequency transmitting antenna 86 in the passenger compartment, an antenna 'low-frequency transmission 88 in an outer zone near the motor vehicle and a signal processing unit 90 lower frequencies; - a detection unit 92 for the implementation of the detection of proximity and contact with the casing 102-104-106. Based on measured values ​​of the capacitances of the capacitive sensors 102 and 104, the detection unit 92 is adapted to whether an object is near or in contact with the casing 102-104-106; - a processing unit access TTS-94 modulated identification signals transmitted by the badge 72 via the transmission channel by current passing through the body, said unit including demodulating means (not shown);

- a control and command unit 96 of the control system 74; - a microcontroller 98 for controlling the means 100 such actuators to unlock the various openings of the vehicle, means for locking the openings of the vehicle and means to start the vehicle.

[113] This embodiment has an economic advantage because resources have been removed.

[114] In a second embodiment, the inventor proposes a handsfree system 110, shown in Figure 6, identical to the previous except that it no longer includes means implementing the radio frequency transmission, c ' ie the low-frequency transmission and high-frequency transmission.

[115] The hands-free system 110 always has a badge 112, a control system 114 and a device 116 PSU.

[116] An essential feature of such a hands-free 1 system 10 is that the transmission current through the body here is bidirectional in order firstly to wake (or activate) the badge 112 and secondly to set implement the identification of the badge 112 and 114 of the control system.

[117] The device PSU1 16 is identical to the PSU 50 device described in Figure 2 and has the same characteristics.

[118] The Device 1 PSU 16, and comprises: - a first capacitive proximity sensor 118; - a second capacitive sensor contact 120; - a detection circuit board 122. [119] The badge 112 comprises: - means 124 as a conductive plate, for the implementation of the detection of proximity and contact with the PSU device 1 16. The conductive plate generates a change in the value of the capacitance of the capacitive sensors when the distance which separates the housing 116 decreases; - a badge TTS-processing unit 126 the signals exchanged via the transmission channel by current passing through the body, said unit having a conductive plate of transceiver 128, means 130 of modulation demodulation; - a unit 132 for control and command of the button 112. [120] The control system 114 comprises: - a detection unit 134 for the implementation of detecting proximity or contact of an object with the housing 116; - a TTS-access processing unit 136 of the signals exchanged between the tag 112 and the control system 114 via the transmission channel by current passing through the body, said unit comprising means 138 for demodulation and modulation, and means 140 for comparison of oscillatory characteristics of modulated signals; - a control and command unit 142 of the control system 114; - a microcontroller 144 for controlling the actuators 146 of the type means to unlock the various openings of the vehicle, means for locking the openings of the vehicle and means to start the vehicle.

[121] To reduce the energy consumption of the handsfree system 110, the handsfree 1 system 10 is by default in a mode called "standby". Particularly, the means 122, 136 for the implementation of the transmission channel by current passing through the body, are disabled.

[122] Thus, the approach of a body part of a user to a PSU Device 1 16, the PSU 118 system 124, 134 detects, through the capacitive proximity sensor 118, the approach of said body part .

[123] The PSU 118 system, 124, 134 transmits a signal representative of a proximity detection to the control unit and control 142 activates means 122, 136 implementing the transmission channel by current passing through the body .

[124] In addition, the PSU 118 system, 124, 134, thanks to the proximity detection as we have already described, detects a control function for the motor vehicle associated with the housing 116 for which the PSU 118 system, 124, 134 detects an approach.

[125] To activate the badge 112, it was found that even without that the person wearing the badge 1 12 is in contact with the housing 116, the conductive plate 122 of control system 114 itself radiates a radiofrequency field on the basis of a modulated identification signal. The conductive plate 122 then acts as a radio frequency transceiver antenna. The invention is based on the use of the radio frequency field to activate the button 112. Thus, when 1 14 Monitoring system is activated, the conductive plate 122 emits a radiofrequency field on the basis of a modulated identification signal having data typecomportant the identifier code of the badge 112 and the identifier code of the control system 114.

[126] The conductive plate 128 of the badge 1 12 receives the radio frequency fields which activates the button 112, on condition that the ID code of the control system 114 is recognized.

[127] Only, the conductive plate 128 of the button 112 also rayon and the conductive plate 122 of detection necessarily receives this radio frequency wave.

[128] The TTS-access processing unit 136 can then demodulate the modulated remote identification signal and therefore the identifier code of the badge 112, which of course is not desirable according to the requirements of the invention if the it is desired to ensure that the initiator of the control functions is the badge wearer.

[129] Thus, the hands-free system 110 comprises means for distinguishing an identification position of the badge holder depending on whether its key holder or not the printed circuit board for detecting the control system.

[130] The processing unit 136 has access TTS-comparator wave feature signals, particularly a phase comparator.

[131] The TTS-access processing unit 136 further comprises a receiving high-frequency antenna, high-frequency signals transmitted by the badge made radiofrequency radiation of the conductive plate 128.

[132] Thus, in the absence of contact with a body part of the badge holder with the housing, the receiving part can demodulate an identification code "remote". Such a system is thus able to implement a detection mode "contact" and a detection mode to "distance".

[133] Thus, the invention is here based on the distinction between the two detection modes. Or, the above two detection modes are distinguished by a difference in wave characteristic.

[134] Indeed, the radiation modulation signal is phase shifted by 180 ° relative to the contact modulation signal. And at a time t, the instantaneous amplitudes of the modulation signals are in phase opposition.

[135] The phases of the recovered signals are therefore compared with the comparison wave characteristics 140 as a phase comparator. Following this comparison, the TTS-access processing unit 136 judges whether the badge wearer detection mode is a detection mode "in touch" or a detection mode "distance" of the conductive plate 122 depending on whether the two signals are in phase (the case of non-contact) or in phase opposition (in the case of contact). Of course, other phase laws or other wave characteristics that phase are used according to the invention.

[136] On 1 14 Monitoring system and takes into account the identifier code of the badge 112 only if the reception portion detects an actual contact between a body part of the badge of the wearer and the conductive plate 122 of the receiving part.

[137] As long as the transmission current through the body is not established, i.e. when the body part of the user is not simultaneously contact the badge 112 and the housing 116, the system control 114 prohibits any control function.

[138] Once the user badge wearer puts his hand on the housing, the processing unit 136 transmits to the card 112 a modulated identification signal comprising an identification code of the badge 112, an identifier code control system 114 and the object signal such as the identification of the badge.

[139] The processing unit 126 demodulates the badge, thanks to the demodulating means 130, the modulated signal received identification and transmits the various identifier codes to the control unit 132 and control of the badge. [140] The control unit and control 132 compares the identifier codes of the card and control system respectively at a FirstDE and second reference values.

[141] If the ID codes are correct, i.e. acknowledged, the processing unit 126 outputs a modulated signal (via the modulation unit) for confirming the identification of the control system 1 14, the activation of the badge 112 and the location of the badge 1 12. the modulated signal transmitted modulus involves in particular the codes i denti- ners of the badge 112 and 114 of the control system.

[142] The TTS-access processing unit 136 detects, through the conductive plate 122 of detection, the modulated signal and compares same manner as previously, after demodulation, the identifier codes for reference values. If the identifier codes prove accurate, the control system 114 allows the control functions of the motor vehicle.

[143] Particularly, the control unit and control 142 sends to the microcontroller 144 a signal representative of the detected function control. The microcontroller 144 then controls the actuators 146 is adapted to the locking or unlocking of the doors or the trunk release or is at starting the vehicle.

Claims

claims
[001] An access system "hands-free" and / or functions of a motor vehicle control of the type comprising at least one badge (4) and a control system (6) on board the motor vehicle connected to at least one access control device and / or function of the vehicle (PSU, BF, RF, DEM), characterized in that it comprises means (TTS) using a current transmission through channel the body for the exchange of data in the form of current, between the badge (4) and the control system (6) to ensure that the initiator of the control functions of the motor vehicle is a user wearing the badge (4).
[002] The system of claim 1, characterized in that the means (18, 48, 36) using a current transmission channel passing through the body includes means (48) for communication TTS on the vehicle having one electrode plate (would be better electrode plate shape is not essential and may he not introduce a restriction on the concept? true for all the rest of the document) conductor (48) disposed in a housing (50) associated with at least one opening of the motor vehicle and / or a start button of the motor vehicle, which one electrode is connected to a reception channel (62) and to means (64, 66) for detecting an identification signal transmitted by a conductive plate (58) on the badge (4) to detect the presence of the badge of the carrier (4) when a command or function on the vehicle are activated.
[003] The system of claim 2, characterized in that it also comprises means (8, 12, 22, 24, 26) for implementing a poultry-frequency transmission channel for the activation of the badge (4 ) in an area (Zone_l) near the motor vehicle or in an area (Zone_2) of the passenger compartment of the motor vehicle which cooperates with the transmission channel TTS to detect the presence of the badge of the carrier (4) when a command or a function of the vehicle are activated.
[004] A system according to any one of claims 2 or 3, characterized in that it also comprises means (10, 14, 28, 30) to implement a high-frequency transmission channel for the identification the badge (4) to detect the presence of the badge of the carrier (4) when a command or function on the vehicle are activated.
[005] A system according to any one of claims 2 to 4, characterized in that it also comprises means (20, 34, 44) for detecting an approach of an object with a PSU device (50), associated with at least one opening of the motor vehicle and / or a start button of the motor vehicle to activate the control system (6) which cooperate with the means (TTS) for detecting the presence of the badge of the carrier (4) when a command or a function of the vehicle are activated.
[006] The system of claim 5, characterized in that the means (20, 34, 44) for detecting an approach of an object comprise at least one capacitive sensor (or an infrared sensor or more generally any capteurcomme a captive sensor or an infrared sensor capable of detecting the approach or the intention to activate the function) (44) for detecting an approach of an object with said device PSU (50) for detecting a control intention of functions of the motor vehicle as an unlocking of the doors (PI - P4, C) of said vehicle which cooperates with the means (TTS) for detecting the presence of the badge of the carrier (4) when a command or function on the vehicle are activated.
[007] The system of claim 5, characterized in that the means (20, 34, 44) for detecting an approach of an object comprise at least one capacitive proximity sensor (6 ditto for other forms of sensors) (44) associated with the start button of the motor vehicle for detecting an approach of an object with said device PSU (50) for detecting a start command for the motor vehicle which cooperates with the means (TTS) for detecting the presence badge of the wearer (4) when a command or function on the vehicle are activated.
[008] A system according to any one of claims 2 to 4, characterized in that it comprises means (20, 34, 46) for detecting a contact of an object with a PSU device (50) for detecting a function control for the motor vehicle as an automatic locking of the doors of the motor vehicle, which cooperate with the means (TTS) for detecting the presence of the badge of the carrier (4) when a command or function on the vehicle are activated .
[009] A system according to any preceding claim, characterized in that the means (TTS) using a transmission channel by current passing through the body are means (122, 126, 136) using a channel bidirectional transmission between the badge (4; 112) and the embedded control system (6; 114) to ensure that the initiator of the control functions of the motor vehicle is an authorized user carrying the badge (4).
[010] The system of claim 9, characterized in that the board control system (6; 114) cooperates with at least one plate (electrode?) Conductive (122) of radio frequency field emission for the activation of the badge (112) by detecting on the receiving TTS path (128) of the badge (4; 112), said conductive plate (122) being disposed in relation to the vehicle as a vehicle door, including a device (PSU) .
[011] A system according to any one of claims 9 or 10, characterized in that the badge (4; 112) comprises a conductive plate (128) transmitting and receiving identification badge modulated signals (1 12 ) and control system (114) connected to the means (TTS) implementing the current through the body.
[012] A system according to one of claims 10 or 1 1, characterized in that the badge (4; 112) includes alarm means coupled to the badge with a remote reception channel of a wakeup radio frequency wave badge produced under the control of embedded control system (6; 122).
[013] The system of claim 12, characterized in that the badge (4; 122) comprises and / or the embedded control system (6; 114) cooperates with a means of comparison of wave characteristics for distinguishing a TTS type contact with a conductive plate (122) and a remote transmission TTS.
PCT/EP2005/051990 2004-05-04 2005-05-02 Free-hands access and control system for a motor vehicle functions WO2005109699A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR0404754A FR2869859B1 (en) 2004-05-04 2004-05-04 to access system and hands-free control functions of a motor vehicle
FR0404754 2004-05-04

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GB2435900A (en) * 2006-03-11 2007-09-12 Carglass Luxembourg Sarl Zug Vehicle security control system
FR2942755A1 (en) * 2009-03-03 2010-09-10 Continental Automotive France Individual identification method for e.g. starting car, involves adapting portable telephone carried by individual to transmit identification data at destination of near field communication readers
FR3022092A1 (en) * 2014-06-10 2015-12-11 Ramesh Sadagobane Automatic Identification System and proceeds by touch and without key access

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WO2005034393A1 (en) * 2003-10-06 2005-04-14 Valeo Securite Habitacle (Sas) System for hands free access and for controlling a motor vehicle operations

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GB2435900A (en) * 2006-03-11 2007-09-12 Carglass Luxembourg Sarl Zug Vehicle security control system
FR2942755A1 (en) * 2009-03-03 2010-09-10 Continental Automotive France Individual identification method for e.g. starting car, involves adapting portable telephone carried by individual to transmit identification data at destination of near field communication readers
FR3022092A1 (en) * 2014-06-10 2015-12-11 Ramesh Sadagobane Automatic Identification System and proceeds by touch and without key access

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Publication number Publication date Type
FR2869859B1 (en) 2007-08-17 grant
FR2869859A1 (en) 2005-11-11 application

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