EP2143080A1 - Method for detecting an identification object in a vehicle - Google Patents
Method for detecting an identification object in a vehicleInfo
- Publication number
- EP2143080A1 EP2143080A1 EP07858043A EP07858043A EP2143080A1 EP 2143080 A1 EP2143080 A1 EP 2143080A1 EP 07858043 A EP07858043 A EP 07858043A EP 07858043 A EP07858043 A EP 07858043A EP 2143080 A1 EP2143080 A1 EP 2143080A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna device
- magnetic field
- identification object
- detection method
- signal
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims description 27
- 230000004044 response Effects 0.000 claims description 11
- 125000004122 cyclic group Chemical group 0.000 claims description 9
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 12
- 238000004891 communication Methods 0.000 description 11
- 230000006870 function Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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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
-
- 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
- G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
- G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
- G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
-
- 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
- G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
- G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
- G07C2209/63—Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
Definitions
- the present invention relates to a method for detecting an identification object in an area around an antenna device (s) and a detection system implementing the detection method.
- an object of identification such as a badge which acts as a receiver-transmitter to know if it is inside or outside of the passenger compartment of the vehicle. If the badge is inside the vehicle, the user is allowed to start the vehicle.
- the detection of the badge is based on a magnetic field emitted from a constant power from a voltage regulation of the antenna device.
- the antenna device being supplied with voltage by the vehicle battery voltage, at each variation of this voltage (due to different actions such as a vehicle start, or an engine stop, etc.), it is necessary to readjust to allow the antenna device to transmit at a constant power.
- the object of the invention is therefore more particularly to enable detection of an identifying object with a simpler solution.
- the method according to the invention has the following additional features.
- the calibration signal is not intelligible by the identification object. This allows the identification object to quickly receive the functional signal thereafter.
- the process comprises a further step according to which: when sending the calibration signal, a current flowing in the antenna device is measured, and
- the measured current is compared with an initial current so as to determine the adjustment power.
- the calibration signal depends on a current measurement that is simple to implement.
- a power is set with a given duty cycle voltage. This regulation is simple to implement. In addition, this makes it possible to compensate for variations in the supply voltage of the antenna device (s).
- the voltage is a symmetrical signal. This makes it possible to suppress the even-numbered harmonics in the measured current signal and thus obtain a more accurate measurement of the current.
- the duty ratio is 1/3. This makes it possible to suppress the multiple harmonics of three in the measured current signal and thus obtain a more accurate measurement of the current.
- the voltage is generated by means of a power stage with full-bridge or half-bridge control. This allows for a greater range of currents.
- the calibration signal is triggered according to a particular event. This makes it possible to regularly have an updated calibration signal and therefore subsequently a regular and accurate measurement of the magnetic field emitted by the antenna device (s).
- the particular event is a vehicle access. This makes it possible to take into account the variations in the magnetic field emitted due to external events such as temperature variations.
- the particular event is a battery voltage variation. This makes it possible to take into account these variations in the calibration.
- the method comprises an additional initial step of writing a fixed threshold value in the identification object. This makes it possible to obtain a fixed reception field from which the identification object can receive signals from the antenna device (s) and communicate with an associated control device.
- the fixed threshold value is a function of a nominal magnetic field. This allows the identification object to respond to a signal transmitted from the antenna device (s) when it is in the area corresponding to the nominal magnetic field. .
- the area around the antenna device (s) is defined by the nominal magnetic field.
- the area around the antenna device (s) corresponds to a vehicle interior. Thus, it is determined whether the identification object is in the passenger compartment of the vehicle to allow a start of the vehicle.
- the invention relates to a system for detecting an identification object in an area around an antenna device (s), comprising a control device, an antenna device (s) and an identification object, characterized in that: - the control device is able to:
- the invention relates to an antenna device (s) adapted to cooperate with an identification object, characterized in that it is able to:
- the invention relates to a control device adapted to cooperate with an antenna device (s) and with an identification object, characterized in that it comprises a signal transmitter for:
- control device further comprises a signal receiver for receiving a response from the identification object according to a comparison made between a received magnetic field and a nominal magnetic field.
- the comparison is performed by the identification object.
- the invention relates to a motor vehicle comprising a passenger compartment in which is arranged a control device according to any one of the preceding characteristics, an antenna device (s) characterized according to any one of the preceding characteristics, the two devices being able to cooperate with an identification object.
- FIG. 1 is a top view of a vehicle with a detection system implementing the method according to a non-limiting embodiment of the invention
- FIG. 2 is a representative diagram of a reception of an identification object detected by the method according to a non-limiting embodiment of the invention
- FIG. 3 is another representation of this threshold threshold for receiving an identification object detected by the method according to a non-limiting embodiment of the invention.
- - Figure 4 is a diagram of a non-limiting embodiment of the method according to a non-limiting embodiment of the invention.
- FIG. 5 is a non-limiting mode of a communication used between an identification object and an antenna device in the context of the method of Figure 4;
- FIG. 6 represents a frequency spectrum of a current flowing in an antenna device and measured as part of the method of FIG. 4;
- FIG. 7 represents a first embodiment of a voltage signal applied to the antenna device in the context of the method of FIG.
- FIG. 8 represents a second embodiment of a voltage signal applied to the antenna device in the context of the method of FIG. 4 and an associated frequency of current spectrum
- FIG. 9 represents a third embodiment of a voltage signal applied to the antenna device in the context of the method of FIG. 4 and an associated current frequency spectrum
- FIG. 10 represents a magnetic field in space whose component corresponds to a magnetic field emitted as part of the method of FIG. 4;
- FIG. 11 represents an explanatory cycle-current diagram diagram of certain steps performed by the method according to FIG. 4;
- FIG. 12 represents a non-limiting embodiment of a detection system implementing the method of FIG. 4;
- FIG. 13 represents a non-limiting embodiment of a power stage included in the detection system of FIG. 12;
- FIG. 14 represents a nonlimiting example of a voltage signal generated by the power stage of FIG. 13 and an associated current frequency spectrum; and - Figure 15 is a diagram showing ranges of currents used in the process of Figure 4.
- FIG. 1 shows a vehicle V equipped with a signal transmission-reception device DER for controlling an antenna device A, and the antenna device A comprising, in a nonlimiting example, a plurality of antennas, here so-called external antennas AX and so-called internal antennas AI, all these antennas cooperating with a receiver-transmitter ID, all forming a detection system described below.
- a signal transmission-reception device DER for controlling an antenna device A
- the antenna device A comprising, in a nonlimiting example, a plurality of antennas, here so-called external antennas AX and so-called internal antennas AI, all these antennas cooperating with a receiver-transmitter ID, all forming a detection system described below.
- each antenna is powered by low-frequency alternating current by the DER transceiver and emits a Be magnetic field, named Bel for indoor antennas and BeX for external antennas.
- the external antennas AX make it possible to detect whether the receiver-transmitter ID is located near the vehicle V, in a nonlimiting example at a distance of less than 1.5 mm, whereas the antennas AI interiors detect whether the receiver-transmitter ID is in the passenger compartment VH of the vehicle.
- the receiver-transmitter ID in this application, is in a non-limiting example, an identification object ID carried by a user of the vehicle V, for example a badge, a key, a keyfob called "keyfob" etc.
- an identification object ID carried by a user of the vehicle V
- a badge for example a badge, a key, a keyfob called "keyfob" etc.
- keyfob a keyfob
- the antennas A communicate with the ID badge by transmitting data by emitting a low frequency signal BF and the ID badge responds by emitting an RF radio frequency signal.
- the low frequency signal BF is around 125 kHz and the radio frequency RF signal is around 433 MHz.
- the antennas A determine whether the badge ID is allowed to open the doors of the vehicle, or whether it is allowed to start the vehicle.
- the handles include appropriate detectors.
- the external antennas AX make it possible to determine a first zone of communication with the badge ID to authorize a vehicle access. This zone is defined by the magnetic field emitted by said antennas. External AX antennas must therefore guarantee at least a minimum distance from which the ID badge is authorized to access the vehicle.
- the internal antennas AI make it possible to determine a second zone ZO for communication with the badge ID to authorize a start. This zone is defined by the magnetic field emitted by the internal antennas. The internal antennas AI must therefore guarantee a fixed zone from which the ID badge is authorized to start the vehicle, this zone being the passenger compartment VH of the vehicle V.
- the magnetic field emitted by these indoor antennas AI has a greater coverage than the passenger compartment VH but is limited by the metal carcass of the passenger compartment VH of the vehicle V and overflows through the openings of the windows.
- the detection of the ID badge in the second zone ZO is based on the fact that the badge is initialized with a fixed threshold value SO according to a received magnetic field BO called nominal field. Without limitation, this fixed threshold value SO is a power PO corresponding to the nominal field BO.
- a magnetic field received Br by the badge ID is a function of the emitted magnetic field Be of the antenna device A, the latter defining the zone ZO around it representative of its magnetic field Be, which has also been called a zone Communication.
- FIG. 2 illustrates the position of the badge ID with respect to an antenna A of the antenna device as a function of the magnetic field Be of this antenna A and therefore of the corresponding received magnetic field Br.
- the ID badge is located far from an antenna A emitting a magnetic field emitted Be, the lower the magnetic field received Br corresponding is weak.
- the received magnetic field Br is theoretically equal to the emitted magnetic field Be.
- the nominal magnetic field BO therefore corresponds to the nominal communication zone ZO in which an ID badge can communicate with an antenna A and the transmission-reception device DER.
- the ID badge When the ID badge is outside this zone ZO (the magnetic field received Br is less than the nominal magnetic field received BO), the ID badge does not respond to the signals sent by the antenna device A or sends an RF response radio voluntarily wrong. This means that it is located outside the passenger compartment VH of the vehicle. In the opposite case, it responds by emitting an RF radio frequency signal.
- this nominal magnetic field BO is set so as to avoid the parasitic magnetic fields Bb originating from the radio disturbances as illustrated in FIG. 2 and its value is greater than the value of the parasitic magnetic fields.
- Figure 3 illustrates an example of positioning the ID badge with respect to an indoor antenna AI1.
- the antenna AI1 emits a magnetic field Be at a power of 15 Watts.
- the ID badge when in the ID1 position, receives a magnetic field BrI whose power Pl is 4.5 Watts and therefore less than the fixed threshold SO; so it's outside of the zone ZO defined by the threshold SO will therefore not communicate with the antenna AI1 and the transmission-reception device DER.
- the ID badge when in the ID2 position, receives a magnetic field Br2 whose power P2 is 5.5 Watts and therefore greater than the fixed threshold SO; it is therefore located in the ZO communication zone and will therefore communicate with the antenna AI1 and the transmission-reception device DER.
- the method of detecting the ID badge to know if it is in the communication zone ZO of an antenna, in particular an internal antenna AI is carried out in the following manner as illustrated in FIG. 4.
- the fixed threshold value SO is written in a memory of the ID tag, for example a rewritable type EEPROM memory.
- a calibrating signal S CAL also called a calibration frame, is sent in the direction of the antenna device A at an initial power PI determined for determining an adjustment power PR for the antenna device A.
- S CAL also called a calibration frame
- the calibration signal S CAL is triggered according to a particular event.
- the particular event is a vehicle access.
- a vehicle access is representative of a change in the environment of the antenna device A, a variation of temperatures (due for example to different seasons), which influences the antenna device components and consequently causes a variation of its impedance Z and thus of its magnetic field emitted Be.
- the particular event is a variation of supply voltage, here the battery voltage Ubat (which may vary after an engine start or engine stop for example). This makes it possible to take into account these variations in the calibration, these variations affecting the current flowing in the antenna device. These variations of battery voltages are thus compensated, since in this case the current Irm is measured after a battery voltage variation.
- This step is therefore to take into account the variations of the impedance Z of the antenna device A in the determination of the magnetic field emitted by the antenna device A and consequently in the determination of a power of PR setting to be applied to the antenna device A.
- the calibration signal S C AL is unintelligible by the identification object ID.
- the identification object ID receives it, it does not respond to this signal S CAL. This avoids the badge an additional activation-deactivation period to receive this signal.
- the ID badge will receive faster data included in the S_FONC functional signal that it will receive thereafter.
- the initial power PI is obtained by means of a calibration voltage UC of initial duty cycle ⁇ 1 corresponding to a theoretical initial current Ith.
- this theoretical initial current Ith is determined experimentally by vehicle tests. Its value varies according to the type of vehicle V. In a non-limiting embodiment, this voltage is square. This avoids energy dissipation in the power stage for applying the voltage described below. Indeed, there is a heat energy consumption only during transitions phases unlike a typical sinusoidal voltage where consumption is significantly higher. . This stage of power does not heat too much.
- a second substep Ib when sending the calibration signal S CAL, the actual current Irm flowing in the antenna device A is measured.
- an initial power PI corresponding to at the theoretical initial current Ith
- the current flowing in said device is in practice not equal to the theoretical initial current Ith.
- the measurement of the current Irm flowing in the antenna device A can be carried out in a simple manner by a peak amplitude detector C described below.
- This current Irm is an alternating current whose frequency spectrum comprises harmonics h.
- the harmonics of rank 1 to 5 are represented in a simplified and nonlimiting example.
- the antenna device A is tuned to the transmission frequency (the frequency being for example 125 kHz). This makes it possible to emit a larger magnetic field in amplitude at the transmission frequency, and to have a bandpass filter FL.
- the bandpass filter FL thus makes it possible to reduce the amplitude of the harmonics h (except for the harmonic of rank 1).
- the value of the current Irm flowing in the antenna device A is equal to the sum of the harmonics h which are present in the passband of the filter included in the Antenna device A.
- all harmonics will be available if the filter is broadband as shown in FL1 in FIG. 6, or only a part of the harmonics if the filter is narrow band such as represented in FL2 in Figure 6.
- the value of the emitted field Be is a function of this current Irm with harmonics h.
- the value of the current Irm which is taken into account is equal only to the harmonic hl of rank 1 called fundamental.
- the received magnetic field Br (and consequently the fixed threshold value SO) corresponds to the magnetic field emitted Be at the fundamental value only and not at the sum of the harmonics.
- the calibration voltage UC is a symmetrical voltage.
- the even-order harmonics of the measured current Irm have been suppressed.
- the voltage UC is symmetrical with respect to the point PT.
- the symmetrical CPU voltage will make it possible to obtain precise generation and precise measurement of the initial power PI corresponding to the harmonic hl of rank 1 by suppressing parasitic currents due to other harmonics.
- a harmonic of rank n is represented by the term a n cosn ⁇ t + b n sinn ⁇ t.
- hl (4E / ⁇ ) .sin ⁇ l. sin ⁇ x
- the symmetrical square voltage makes it possible, on the one hand, to adjust the initial power transmitted PI to a desired value corresponding to the desired communication zone ZO (and thus to accurately generate the transmitted power PI) and on the other hand to obtain an accurate measurement of the actual transmitted power PI corresponding to the effective received power of the ID badge because the harmonics of even rank are suppressed.
- the calibration voltage UC comprises a duty cycle of 1/3 which corresponds to an offset of ⁇ / 3 of the voltage signal UC.
- the multiple rank harmonics 3 of the measured current Irm have been suppressed.
- the measured current Irm is therefore in this case representative of the amplitude of the fundamental of the emitted magnetic field.
- a magnetic field B comprises three components in an orthogonal space x, y, z as illustrated in FIG. 10 which are as follows.
- the calibration voltage UC can be obtained by means of an H-bridge power stage P with full bridge control described below.
- the measured current Irm is compared to the theoretical initial current Ith. The difference will make it possible to determine the real impedance Zr of the antenna device A and consequently to determine the adjustment power PR to be applied to the antenna device A.
- a transmitted field Be is determined corresponding to a power PR.
- This field that we want to obtain whose value is known therefore corresponds to a known current Iv.
- the adjustment power PR is adjusted by means of a functional voltage UF of adjustment duty cycle ⁇ 2.
- a duty cycle ⁇ 2 is thus determined.
- the adjustment duty ratio ⁇ 2 is calculated by means of a microprocessor of the transmission-reception device DER described below.
- the corresponding cyclic adjustment ratio ⁇ 2 is recovered in the table. to a desired functional current Iv which takes into account the variations of the impedance Zr of the antenna device A.
- a desired functional current Iv which takes into account the variations of the impedance Zr of the antenna device A.
- the abscissa is represented by the cyclic ratio ⁇ and the ordinate by the current I.
- an initial duty cycle voltage ⁇ 1 is applied for a theoretical initial current Ith.
- the correspondence between this initial cyclic ratio ⁇ 1 and the theoretical initial current Ith lies on a curve CZth representative of the theoretical impedance Zth of the antenna device A.
- the actual current Irm flowing in the device is measured at this initial duty cycle ⁇ 1 .
- the correspondence between this cyclic ratio ⁇ 1 and the actual measured current Irm is situated on a curve representative of the real impedance Zr of the antenna device A. Two curves maximum CZrmax and minimum CZrmin of this real impedance Zr are represented.
- the corresponding adjustment cyclic ratio ⁇ 2 is determined by taking the curve of the real impedance Zr, here CZrmax and making a projection on the abscissa axis.
- the adjustment duty cycle ⁇ 2 has thus been found to apply the desired functional voltage UF to obtain a desired power PR in the antenna device A. It will be noted that the functional voltage UF can be obtained by means of a stage of FIG. H-bridge power P with full-bridge and half-bridge control described later.
- This first calibration step 1) therefore corresponds to a self-calibration of the SYS detection system to determine the adjustment power PR. Indeed, no external measuring device is necessary for this calibration.
- this auto-calibration is dynamic because it is launched during the operation of the antenna device (s), and not during its development of the antenna device (s) in the factory for example.
- a functional signal S FONC is thus sent, also called a functional frame, in the direction of the antenna device A, as illustrated in FIG.
- FIG. 5 to the adjustment power PR determined above so that the antenna device A emits a determined magnetic field Be corresponding to the desired zone ZO and more particularly to the passenger compartment VH in the example taken from the vehicle application.
- the received magnetic field Br is measured by the identification object ID corresponding to the transmitted magnetic field Be of the antenna device A.
- This measurement is carried out by means of a measurement device of the type RSSI d an amplifier ("Received Signal Strength Indication") well known to those skilled in the art included in the identification object ID.
- a fourth step 4 the received magnetic field Br is compared with the nominal magnetic field BO. This comparison is performed in the identification object ID.
- a fifth step 5 it is determined whether the ID badge is in the zone ZO around the antenna device A according to this comparison.
- the ID badge is in the zone ZO around the antenna device A, and therefore inside the passenger compartment VH vehicle, if the magnetic field received Br is greater than the nominal magnetic field BO.
- the badge ID therefore returns an affirmative response REPOK to a DC control device of the transmission-reception device DER, as illustrated in FIG. 5. The latter therefore authorizes a vehicle start-up for example.
- the badge ID is located outside the zone ZO, and therefore outside the cockpit VH vehicle, if the magnetic field received Br is less than nominal magnetic field BO.
- the ID badge returns no response, it acts as if it has not received the functional signal S FONC from the antenna device A, or it sends a negative response REPNOK to the DC control device, as illustrated in Figure 5. The latter therefore prohibits any vehicle start for example.
- the badge ID systematically sends a response REP including the result of the comparison.
- a DER transceiver device comprising:
- the identification badge ID a receiver-transmitter, here, the identification badge ID.
- all the elements of the transceiver device DER are on the same electronic card. This allows a faster and more reliable dialogue between these different elements. On the contrary, when these elements are separated, the communication links connecting them can be more easily disturbed and the flow rates of these links can be lower.
- the identification badge ID is known to those skilled in the art, it is not described here.
- the antenna device A is composed of a circuit RL.
- the latter requires amplifying the supply voltage of the antenna device to allow appropriate magnetic field emission.
- the antenna device A is composed of an RLC circuit.
- the latter makes it possible from the supply voltage of the antenna device A, which is here the battery voltage Ubat of the vehicle V, to directly amplify the current I flowing in the antenna device A to enable a field emission. magnetic field, without using voltage control unlike the first embodiment. It is therefore a simpler solution to implement to obtain amplification.
- This RLC circuit also acts as a bandpass filter as seen previously.
- the DC control device includes:
- an emitter EM of signals for, in particular:
- a comparator CMP of current Irm, Ith, and a CALC calculation element making it possible in particular to adapt the cyclic ratios ⁇ 1 and ⁇ 2 of the UC and functional calibration voltages UF.
- control device DC may furthermore comprise: the receiver RE of signals for, in particular, receiving a response REPOK, REPNOK of the identification badge ID as a function of the comparison made between the magnetic field received Br and the nominal magnetic field BO.
- the power stage P is H-bridge with full-bridge or half-bridge control. It is illustrated in FIG. 13. It comprises in particular four switches S1 to S4. These switches are in a nonlimiting example of the MOSFET transistors.
- the power stage P operates as a full bridge in the following manner.
- the example is taken for a symmetrical voltage as shown in Figure 7.
- the power stage P operates in the following half-bridge manner as illustrated in the example of Figure 14. It will be noted that the switch S4 is always closed. Between the intervals t0-t1 and t2-t3, the other three switches S1-S2-S3 are open, or the switch S2 is closed, the other two S1-S3 being open. UC / UF voltage is zero.
- the switch S1 is closed, the other two S2-S3 being open.
- the UC / UF voltage is positive.
- the switch S2 is closed, the other two S1-S3 being open.
- UC / UF voltage is negative.
- the power stage P is used to obtain the initial power PI via the calibration voltage UC but also the adjustment power PR via the functional voltage UF.
- the adjustment power PR necessary to send the S_FONC functional signals is a function of this battery voltage and the impedance of the antenna device Zr.
- the adjustment duty cycle ⁇ 2 is adjusted appropriately. For example, for a high battery voltage, the power stage P is operated half-bridge, while for a low battery voltage, it is operated full bridge. In order to obtain a continuous range between the two ranges of currents G1 and G2, in a non-limiting embodiment, the duty ratio ⁇ 2 is in the range [1/6 - 1/2].
- the duty ratio ⁇ 2 varies in the interval [1/6 - ⁇ max '] with ⁇ max' less than 1/2, as illustrated in FIG. 15, it can be seen that there has a jump in current values when moving from the half-bridge to the full bridge. In this case, some current values can not be taken into account to determine the power of the antenna device A. These are those in the range 122 'and 122 hatched. In the latter mode, to ensure continuity, take the lower limit ⁇ min of the interval less than 1/6.
- the current measuring device is a peak amplitude detector. This is a simple way to measure the current. It makes it possible to measure the maximum amplitude of the current, which is sufficient because the disturbing harmonics have been suppressed by the symmetrical control and the duty cycle of 1/3. Thus, this measure will give the value of the fundamental of this current. It is conventionally composed of a diode and a capacitor as shown in Figure 12.
- the current measuring device C may be a digital sampling device or else a device which performs a rectification of current and then an average of the rectified current.
- the antenna device A comprises one or more antennas. In the nonlimiting example described, it comprises a plurality of antennas as seen above. In this practical case, for each antenna of the antenna device A, the current is regulated in the antenna to obtain a nominal magnetic field BO associated and corresponding to the zone ZO of communication between the badge ID and the antenna.
- the ID badge comprises a plurality of fixed threshold value SO, associated with each antenna of the antenna device A.
- the invention has the following advantages:
- this threshold is fixed for all the vehicles, which makes it possible to have a universal identification object ID that functions with all the vehicles, the communication area ZO being adapted only by the transmission power Pe and therefore by the current I flowing in the antenna device A; -
- the power is regulated by means of a duty cycle control which is less expensive than a voltage regulation with fixed duty cycle;
- the duty cycle regulation is based on the current which is more efficient and accurate than a setting according to the battery voltage because the variations of the impedance Zr of the antenna device A are compensated contrary to a solution that would perform a regulation of the supply voltage Ubat;
- the symmetrical H-bridge control makes it possible not to emit the even harmonics and consequently to reduce electromagnetic compatibility problems called EMC;
- the symmetrical calibration command with a duty cycle of 1/3 allows precise measurement of the current with a simple measuring device such as the peak amplitude detector;
- the calibration step which makes it possible to determine an adjustment power in order to determine the value of the magnetic field emitted by the antenna device (s), is dynamic because it is done during the operation of the antenna device (s). );
- the dynamic calibration step requires no additional external measuring device, unlike static calibration steps which are done upstream, ie during the mounting of an antenna device (s) (that is to say during its development) in a vehicle (thus even before the production and sale of the vehicle);
- the detection system comprising the antenna device (s) and the identification object makes it possible to perform an auto-calibration of antenna device (s) without external measuring device.
- the invention is not limited to the described application of the motor vehicle, but can be used in all applications involving a low frequency antenna and an identification object such as a home automation application for example.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0611343A FR2910751B1 (en) | 2006-12-22 | 2006-12-22 | METHOD FOR DETECTING AN IDENTIFICATION OBJECT IN A VEHICLE |
PCT/EP2007/064428 WO2008077929A1 (en) | 2006-12-22 | 2007-12-21 | Method for detecting an identification object in a vehicle |
Publications (2)
Publication Number | Publication Date |
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EP2143080A1 true EP2143080A1 (en) | 2010-01-13 |
EP2143080B1 EP2143080B1 (en) | 2013-09-18 |
Family
ID=38162239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07858043.8A Active EP2143080B1 (en) | 2006-12-22 | 2007-12-21 | Method for detecting an identification object in a vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US8773240B2 (en) |
EP (1) | EP2143080B1 (en) |
ES (1) | ES2440254T3 (en) |
FR (1) | FR2910751B1 (en) |
WO (1) | WO2008077929A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011163764A (en) * | 2009-11-04 | 2011-08-25 | Valeo Securite Habitacle | Method of detecting identification target in vehicle |
DE102012016783B4 (en) | 2011-09-24 | 2022-12-15 | Volkswagen Aktiengesellschaft | determining a position of a mobile device relative to a vehicle |
EP2823587B1 (en) * | 2012-03-06 | 2019-07-31 | Keyssa, Inc. | System for constraining an operating parameter of an ehf communication chip |
EP2688140A3 (en) | 2012-07-18 | 2014-04-30 | Aisin Seiki Kabushiki Kaisha | Antenna drive apparatus |
DE102014102271A1 (en) * | 2013-03-15 | 2014-09-18 | Maxim Integrated Products, Inc. | Method and device for granting an access permit |
US10062227B2 (en) | 2014-01-09 | 2018-08-28 | Ford Global Technologies, Llc | Contents inventory tracking system and protocol |
US9836717B2 (en) | 2014-01-09 | 2017-12-05 | Ford Global Technologies, Llc | Inventory tracking system classification strategy |
US9633496B2 (en) * | 2014-01-09 | 2017-04-25 | Ford Global Technologies, Llc | Vehicle contents inventory system |
FR3025641B1 (en) * | 2014-09-08 | 2016-12-23 | Valeo Comfort & Driving Assistance | METHOD FOR DETECTING AN IDENTIFIER FOR STARTING A MOTOR VEHICLE |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19836957C1 (en) * | 1998-08-14 | 1999-09-30 | Siemens Ag | Theft protection arrangement for motor vehicle |
FR2814013B1 (en) * | 2000-09-13 | 2002-10-11 | Valeo Electronique | METHOD FOR CALIBRATING A HANDS-FREE ACCESS SYSTEM FOR A MOTOR VEHICLE |
FR2834344A1 (en) * | 2001-12-28 | 2003-07-04 | Siemens Vdo Automotive | Hands-free keyless entry badge detecting method for use inside vehicle, has four antennas within vehicle which transmit at low frequency but high amplitude and badges which signal identity and amplitude size received |
FR2839785B1 (en) * | 2002-05-14 | 2007-01-05 | Delphi Tech Inc | VEHICLE HAVING A SIGNAL TRANSMISSION DEVICE |
US7046119B2 (en) * | 2004-05-19 | 2006-05-16 | Lear Corporation | Vehicle independent passive entry system |
DE102004059179B4 (en) * | 2004-12-08 | 2006-12-28 | Siemens Ag | Method for locating a transmitting and receiving device |
-
2006
- 2006-12-22 FR FR0611343A patent/FR2910751B1/en not_active Expired - Fee Related
-
2007
- 2007-12-21 WO PCT/EP2007/064428 patent/WO2008077929A1/en active Application Filing
- 2007-12-21 EP EP07858043.8A patent/EP2143080B1/en active Active
- 2007-12-21 ES ES07858043.8T patent/ES2440254T3/en active Active
-
2009
- 2009-06-22 US US12/489,278 patent/US8773240B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008077929A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008077929A1 (en) | 2008-07-03 |
FR2910751B1 (en) | 2009-04-10 |
FR2910751A1 (en) | 2008-06-27 |
ES2440254T3 (en) | 2014-01-28 |
US20090315682A1 (en) | 2009-12-24 |
EP2143080B1 (en) | 2013-09-18 |
US8773240B2 (en) | 2014-07-08 |
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