• 专利附录
  • 专利说明
  • 权利要求
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    • 专利摘要:
    Device for detecting the presence (D) of a parasitic metal object (30) on a receiving surface (S) of a recharging device (10) by induction of a user equipment (20) for a motor vehicle, said device comprising a transmitting coil-type antenna (13) and: • At least two identical passive detection coils (B1, B2), located between the transmitting coil and the receiving surface, • Means (M1, M2, M3) determining quality factor (Q1, Q2, Qe) across the two coils, and the transmitter coil (13), • Control means (M4), • Storage means (M5) of the quality factors at predetermined times; means for calculating (M6) ratios (R1, R1 ', R2, R2') between the stored quality factors, or between values of quality factors stored at different predetermined times; of comparison (M7) between ratios to detect the presence of a n parasitic metal object on the receiving surface.
    公开号:FR3043470A1
    申请号:FR1560669
    申请日:2015-11-06
    公开日:2017-05-12
    发明作者:Mohamed Cheikh
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    Avec : Π : constante égale à 3,14 ; f : fréquence de mesure du facteur de qualité Qi de ladite bobine
    Li : inductance de la bobine à la fréquence f de mesure,
    Ri : résistance de la bobine à la fréquence f de mesure
    Ou également :
    Qi = tan φ
    Avec : φ : déphasage entre le courant et la tension aux bornes de la bobine
    Le procédé de détection de présence d’un objet métallique parasite 30 sur la surface de réception S d’un dispositif de recharge 10 par induction d’une batterie 21 d’un équipement d’utilisateur 20, selon l’invention est illustré à la figure 4 et est décrit ci-dessous.
    Lors d’une première étape E1, lorsque le module de gestion 14 détecte l’absence d’équipement d’utilisateur 20 sur la surface de réception S, les premiers moyens M1, les deuxièmes moyens M2, les troisièmes moyens M3 mesurent ou déterminent respectivement le premier facteur de qualité initial Q1i aux bornes de la première bobine B1, le deuxième facteur de qualité initial Q2i aux bornes de la deuxième bobine B2 et le troisième facteur de qualité initial Qei aux bornes de l’au moins une bobine émettrice 13.
    La détection de l’absence d’équipement d’utilisateur 20 est validée de la manière suivante : le module de gestion 14 commande l’émission d’un « ping », un signal spécifique, par l’intermédiaire de la bobine émettrice 13. L’absence de réponse par une bobine réceptrice 23 à ce signal spécifique signifie l’absence d’un équipement d’utilisateur 20 sur la surface de réception S.
    Comme expliqué précédemment, l’estimation du facteur de qualité est réalisé en mesurant l’inductance Li et la résistance Ri de la bobine à une fréquence de mesure f prédéterminée où à partir du déphasage φ entre le courant et la tension aux bornes de la bobine.
    Lors d’une deuxième étape, E2 les moyens de mémorisation M5 enregistrent dans un espace mémoire dédié les valeurs du premier, deuxième et troisième facteur de qualité initiaux Q1i, Q2i, Qei.
    Puis lorsque, lors d’une troisième étape E3, le module de gestion 14 détecte la présence de l’équipement d’utilisateur 20 sur la surface de réception S (réponse de la bobine réceptrice 23 au «ping» émis par la bobine émettrice13) alors s’ensuit la quatrième étape E4 qui consiste en la mesure ou la détermination par les premiers moyens M1, les deuxièmes moyens M2 et les troisièmes moyens M3 du premier facteur de qualité final Q1f aux bornes de la première bobine B1, du deuxième facteur de qualité final Q2f aux bornes de la deuxième bobine B2 et du troisième facteur de qualité final Qef aux bornes de l’au moins une bobine émettrice 13.
    Dans une cinquième étape E5, les moyens de calcul M6 calculent une première moyenne moy1 entre le premier facteur de qualité initial Q1i et le deuxième facteur de qualité initial Q2i.
    et une deuxième moyenne moy2 entre le premier facteur de qualité final Q1f et le deuxième facteur de qualité final Q2f.
    La sixième étape E6, consiste alors à calculer, par l’intermédiaire des moyens de calcul M6 : • un premier ratio R1, R1’ entre le troisième facteur de qualité initial Qei et le troisième facteur de qualité final Qef ou respectivement entre le troisième facteur de qualité initial Qei et la première moyenne moy2, • un deuxième ratio R2, R2’ entre la première moyenne moy1 et la deuxième moyenne ou respectivement entre le troisième facteur de qualité final Qef et la deuxième moyenne moy2.
    Lors de l’étape finale E7, les moyens de comparaison M7 comparent la valeur du premier ratio R1, R1’ par rapport respectivement à la valeur du deuxième ratio R2, R2’.
    Si :
    Ou si :
    Avec :
    Et
    Avec k1 : constante prédéterminée, comprise entre 0,8 et 1. k2 : constante prédéterminée, comprise entre 0,8 et 1.
    Les constantes k1 et k2 sont déterminées au préalable en fonction de la bobine émettrice 13 (taille, forme, type..) et en fonction de la précision des moyens de mesure.
    Alors, il y a présence d’un objet métallique parasite 30 sur la surface de réception S (E7a), sinon il n’y pas d’objet métallique parasite 30 sur la surface de réception S (E7b). L’invention réside donc sur l’estimation de l’impact de la présence de l’équipement d’utilisateur 20 sur le facteur de qualité moyenné des bobines passives de détection B1,B2, cet impact, en l’absence d’objet parasite métallique 30 doit être sensiblement le même (à un facteur k1, k2 près) que celui sur le facteur de qualité Qe de la bobine émettrice 13.
    Lors de la présence simultanée de l’équipement d’utilisateur 20 et d’un objet métallique parasite 30 sur la surface de réception S, alors l’impact sur le facteur de qualité Qe de la bobine émettrice 13 est plus important que celui sur les bobines passives de détection.
    En effet, la présence de l’objet métallique parasite 30 crée une perte additionnelle de la puissance émise aux bornes de la bobine émettrice 13 (due à la présence d’une résistivité supplémentaire) que le module de contrôle 14 compense en augmentant la puissance d’émission ce qui a pour effet de baisser le facteur de qualité Qe de la bobine émettrice 13. A l’opposé, les bobines passives de détection B1, B2 n’étant reliées à aucun module de contrôle 14, elles ne s’adaptent pas, et subissent la présence de l’objet métallique parasite 30, ce qui baisse la valeur du facteur de qualité moyenné desdites bobines, cependant, due à l’absence d’adaptation, d’une amplitude moindre que celui de la bobine émettrice 13. L’invention permet donc de détecter de manière fiable et peu coûteuse (deux bobines et des moyens logiciels) la présence d’un objet métallique parasite sur une surface de réception d’un dispositif de recharge d’un équipement d’utilisateur.
    The invention relates to the field of energy charging by induction of user equipment in a motor vehicle and relates more specifically to a method and a device for detecting a parasitic metal object in the transmission zone of a motor vehicle. an induction charging device for user equipment in a motor vehicle.
    Nowadays, some motor vehicles are provided with a device for the induction charging of a battery of a user equipment such as, for example, a mobile phone. By the term "battery" is meant in this document an electrical energy storage unit for powering the user equipment.
    Such a charging device comprises a management module, a transmitting module and a receiving surface of the user equipment. The transmission module comprises at least one induction-type induction coil antenna which is coupled to the reception surface and which generates an electromagnetic field around the reception surface in a so-called "emission" zone, for example by operating in a frequency band between 100 and 200 kHz. The device management module is configured to control the transmission module, including the power level of the emission by the coil, to detect a voltage variation across the transmitter coil and to exchange messages with the equipment. user. The user equipment comprises, in a complementary manner, a control module and a receiver module. The receiver module comprises at least one induction coil-type antenna which detects an electromagnetic field generated by the recharging device when it is placed in the emission zone of said device. The control module of the user equipment is configured to control the receiving module and exchange messages with the charging device. An example of a magnetic induction power transfer system is known from the specification defined by the WPC consortium (known as the "Wireless Power Consortium"), known as the "Qi low power specification" (version 1.1 of March 2012) which defines in particular the message exchanges between the charging device and the user equipment.
    In known manner, the electromagnetic field generated by the transmitting coil induces an alternating current in the receiver coil that recharges the battery of the user equipment.
    Thus, when the user wishes to electrically recharge the battery of his equipment, he places it on the receiving surface of the device, which varies the voltage across the transmitter coil of the device.
    The management module of the device detects this voltage variation and deduces that an object at least partly metallic has been placed on the receiving surface.
    The management module of the device then sends a recognition message to know if the object placed on the surface is a user equipment compatible with the charging device, that is to say that can be recharged by the device, or another object such as non-compatible user equipment or any other object at least partly metal.
    Also, when the user equipment is compatible with the device, its control module responds to the device by sending a compatibility message and the induction charging of the user equipment starts until it is complete. or that the user equipment leaves the transmission area.
    When the user equipment is incompatible with the device, its control module responds to the device by sending a message of incompatibility and no electromagnetic field emission is performed by the transmitting module of the device.
    When the object is not an electrically rechargeable user equipment or is any other object at least partly metallic such as, for example a coin, no response message is received by the management module of the device. device following its emission of the recognition message and no emission of electromagnetic field is initiated by the transmission module of the device.
    Such a message exchange thus makes it possible to limit access to charging only to compatible user equipment. Indeed, the generation of an electromagnetic field on a metal object, for example of the coin type, can cause a significant increase in its temperature, for example greater than 80 ° C, which may present a risk of burns to the body. 'user.
    In the following "parasitic object" will be called an object at least partly metal capable of heating sufficiently to present a danger for the user when subjected to an electromagnetic field generated by the transmitter coil of the device.
    Such a danger can thus arise when user equipment and a parasitic object are simultaneously present in the emission area during a recharge of the user equipment, which presents a significant drawback.
    In order to ensure that there is no parasitic object present in the emission zone, the WPC protocol proposes to calculate the difference between the power emitted by the transmitting coil and the power received by the receiver coil and to compare this difference with a predetermined threshold, for example 1 W.
    This calculation is done at the level of the management module of the device which already knows the transmission power of the transmitter coil. It is therefore necessary for the device to receive the power value received by the user equipment. This information can be sent in a known manner by the user equipment, as described for example in the WPC protocol.
    When the difference between the transmitted power and the received power is less than the predetermined threshold, the management module of the device deduces that the object placed on the receiving medium is a user equipment whereas if the difference between the power output and the received power is greater than the predetermined threshold, the management module of the device deduces that a parasitic object, which absorbs a lot of energy, is present in the transmission area of the device.
    This solution, however, has disadvantages. Indeed, to limit the power emitted by the transmitter coil, it is necessary that the transmitting coil and the receiver coil are perfectly aligned, ie superimposed. By way of example, a transmission power of 7 W may suffice to obtain a reception power of 5 W when the transmitting coil and the receiving coil are perfectly aligned. On the other hand, when the transmitting coil and the receiving coil are not aligned, which is common with a motor vehicle charging device for which the user merely places his user equipment on a receiving surface devoid of means. the received power can be significantly reduced, for example by 80% of the value of the transmission power.
    In order to solve this problem, the management module of the device uses in a known way the received power information sent by the user equipment and controls the transmission module so that it increases the transmission power of the coil Issuer. Thus, still as an example, it may be necessary to increase the transmit power up to 15 W to obtain a reception power of 5W when the transmitting coil and the receiving coil are not aligned.
    However, in the case where the transmitting coil and the receiving coil are not aligned, the difference between the transmitted power and the received power is greater than the predetermined threshold mentioned above so that the management module of the device can incorrectly deduce that a parasitic object is present in the emission zone of the device, which has a significant disadvantage.
    It is also known to detect a metallic parasitic object, by measuring the variation of the quality factor of the transmitting coil and the variation of the voltage across said coil. By comparing the measured values, with predetermined thresholds, it is possible to detect the presence of a metallic parasitic object.
    However, the variation of the quality factor of the transmitting coil, and the variation of the voltage across said coil in the simultaneous presence of a metallic parasitic object and said equipment (for example a coin placed under the equipment) are depending on the type of user equipment, its dimensions, its composition (metal, plastic), and the characteristics of the receiver coil. This detection method is not robust, and does not allow reliable detection because it is not possible to set a single predetermined threshold of detection to detect a metal parasitic object all types of user equipment combined. The object of the invention is to at least partly solve these disadvantages by proposing a simple, reliable and effective solution for detecting a spurious object in the emission zone of the recharging device. The invention proposes a device for detecting the presence of a parasitic metal object on a receiving surface of an induction charging device of a battery of a user equipment for a motor vehicle, said recharging device comprising a transmission module, a management module, and a receiving surface of a user equipment, said transmitting module comprising at least one inductive induction coil type antenna coupled to the receiving surface and configured to generate a electromagnetic field around the receiving surface in a so-called "transmission" zone, said device management module being configured to detect the presence of the user equipment on the receiving surface and to control the transmission module, said detection device being remarkable in that it comprises: • At least two identical passive detection coils located between the transmitter coil and the receiving surface: - each coil, a first coil and a second coil forming a continuous loop, open at its ends and comprising a plurality of identical segments spaced apart from each other, and interconnected by a connection, - said two coils being superposed, in two parallel planes, offset from one another by a segment, such that the respective segments of each coil cover distinct surfaces of the receiving surface, the segments being arranged symmetrically with respect to one of two axes perpendicular crossing at a center of the receiving surface, • first means for determining a first quality factor at the terminals of the first coil, • second means for determining a second quality factor across the second coil coil; third means for determining a third quality factor at the terminals of the transmitting coil; Means for controlling the first, second and third means of determination, means for storing the first, second and third quality factors at predetermined times; means for calculating ratios between the first, second and third factors of stored quality, or between values of quality factors stored at different predetermined times, • means for comparing the ratios to detect the presence of a spurious metal object on the receiving surface.
    In a first embodiment, the calculating means calculate: a first ratio which is equal to a ratio between a third initial quality factor and a third final quality factor, and a second ratio which is equal to the ratio between an average of the first quality factor. and the second initial quality factor and an average of the first and second final quality factors, and the comparing means compares the first ratio with the second ratio.
    In a second embodiment, the calculating means calculate: a first ratio which is equal to the ratio between a third initial quality factor and an average of the first and second initial quality factors; a second ratio which is equal to a ratio between a third final quality factor, and an average of the first and second final quality factors, and the comparing means compares the first ratio with the second ratio.
    Preferably, the parallel planes (P1, P2) are merged.
    Advantageously, the segments are smaller than the dimensions of the transmitting coil.
    Judiciously, a number of segments is k times proportional to a number of transmitting coils, with k> 4.
    Preferably, a sum of the distinct surfaces covered by the segments of said two coils is substantially equal to the receiving surface.
    And passive detection coils consist of a single winding of copper wire.
    The first determination means, the second determination means, the third determination means, the storage means, the control means, the calculation means and the comparison means may be in the form of software integrated in the module. Management. The invention also relates to a method for detecting the presence of a parasitic metal object, using the detection device according to any one of the characteristics listed above, the method comprising the following steps: Step E1: Prior determination of the first initial quality factor, the second initial quality factor, the third initial quality factor in the absence of user equipment on the receiving surface, • Step E2: storing the values of the first initial quality factor, the second initial quality factor, of the third initial quality factor, • Step E3: detection of the presence of user equipment on the receiving surface, • Step E4: Determination of the first final quality factor, of the second quality factor final third quality factor, • Step E5: calculating a first average between the first quality factor ini tial and the second initial quality factor, and a second average between the first final quality factor and the second final quality factor, • Step E6: Calculation of a first ratio between the third quality factor and the third quality factor final quality factor, or between the third initial quality factor and the first average and calculating a second ratio between the first average and the second average, or between the third final quality factor and the second average, • Step 7: If the first ratio is greater, by a predetermined factor, at the second ratio, then: - presence of a parasitic metal object on the receiving surface,
    Otherwise - absence of said parasitic metal object. The invention also applies to any motor vehicle, comprising a detection device according to any one of the characteristics listed above. Other features and advantages of the present invention will be better understood on reading the description which follows (by way of non-limiting example) with reference to the appended figures in which: FIG. 1 schematically illustrates a sectional view of the device Referring to the invention, FIG. 2 schematically illustrates a view from above of the detection coils of the device for the presence of a parasitic metal object according to the invention. FIG. 3 diagrammatically represents the presence detection device according to the invention, included in the charging device, FIG. 4 schematically represents the detection method of the invention. The invention relates to a detection device D for the presence of a parasitic metal object 30 on a reception surface S of a charging device 10 by induction of a battery 21 of a user equipment 20.
    As illustrated in FIG. 1, a charging device 10 generally comprises a transmission module 12, a management module 14 and a reception surface S in order to receive the user equipment 20.
    The transmission module 12 comprises at least one transmitting antenna 13. In FIG. 2, two transmitting antennas 13 are shown coplanar and identical to each other. By transmitting antenna 13 is meant a coil adapted to emit at a recharge frequency by magnetic induction.
    The two transmitting coils 13 are located below the receiving surface S and emit an electromagnetic field around said receiving surface S, more precisely in a transmission zone 11 (see FIG.
    The management module 14, generally in the form of integrated software in a printed circuit (not shown in Figure 1) is able to detect the presence of the user equipment 20 on the receiving surface S. This is achieved by the transmission of a recognition signal, called "ping" in the prior art and the return reception by the control module 14 of an identifier message from the user equipment 20.
    Once the user equipment 20 has been identified and compatible with the magnetic induction charging frequency of the recharging device 10, the management module 14 then controls the charging of the user equipment 20 via the module. issue 12.
    In order to be recharged, the user equipment 20, meanwhile, includes a battery 21 to be recharged periodically, a reception module 22, comprising at least one receiving antenna 23, and a control module 24 (see FIG. 1). The receiving antenna 23 receives the electromagnetic waves coming from the transmitting coil 13, and has at its terminals a voltage, which recharges, via the reception module 22, the battery 21.
    The control module 24 is able to communicate via the reception module 22 with the charging device 10.
    In this case, once the battery 21 is recharged, the control module 24 controls the charge stop transmission towards the charging device 10, via the receiving antenna 23.
    This is known from the prior art. The invention proposes a device D for detecting the presence of a metal object 30 on the receiving surface S of the recharging device 10, thus avoiding recharging the user equipment as long as the parasitic metal object 30 is detected. on the receiving surface S and that the user has not removed it from said surface.
    For this purpose, the detection device D comprises: at least two identical passive detection coils B1, B2 between the receiving surface S and the transmitting coil 13, each coil B1, B2 forms a continuous loop, open at its ends and comprises a plurality of segments respectively S1, S2 ... Sn and S1 ', S2', Sn 'identical, spaced apart by a connection respectively L1, L2 ... Ln-1, and L1', L2 '... Ln-1', - said two coils B1, B2 are superimposed in two parallel planes P1, P2, offset from each other by a segment, so that the respective segments S1, S2 ... Sn and S1 ', S2' ... Sn 'of each coil B1, B2 cover distinct surfaces SA, SB of the receiving surface S, - the segments S1, S2 ... Sn and S1', S2 '... Sn 'are arranged symmetrically with respect to one of the two perpendicular axes X-X4 and YY' intersecting at a center 0 of the receiving surface S.
    The two detection coils B1, B2 being situated between the transmitting coil 13 and the receiving surface S, they receive a part of the electromagnetic field emitted by the transmitting coil 13.
    The term continuous loop, open at its ends, at least one electrically conductive copper wire winding, uninterrupted, allowing the passage of the current through the said wire, a first end to a second end.
    Since the detection coils B1, B2 receive part of the emitted magnetic field, they have at their terminal a voltage induced by the presence of said electromagnetic field.
    The segments S1, S2 ... Sn and S1, S2 ... Sn 'consist of excursions of the winding of each coil B1, B2 towards the ends of the receiving surface S (see FIG.
    The links of each coil B1, B2, respectively L1, L2 ... Ln-1, and L1 ', L2' ... Ln-1 'make it possible to connect the segments of each coil B1, B2 between them. The said links L1 ... Ln-1, L1 '... Ln-1' are smaller than the dimensions of the segments S1 ... Sn, S1 '... Sn'.
    Preferably, the links L1 ... Ln-1, L1 '... Ln-1' are identical to each other.
    The receiving surface S defines two perpendicular axes X-X 'and Y-Y' intersecting at a center 0 of said surface S (see FIG. The segments S1, S2 ... Sn 'and S1', S2 '... Sn' are arranged symmetrically with respect to one of the two axes. As illustrated in Figure 2, the segments S1, S2 ... Sn, S1 ', S2' ... Sn 'are symmetrical with respect to the longitudinal axis X-X'.
    In a first embodiment, the two parallel planes P1, P2 are distinct and spaced apart from one another. The distance may for example be of the order of one millimeter.
    In a second embodiment, the two parallel planes P1, P2 merge into one.
    All segments S1, S2 ... Sn, ST, S2 '... Sn' of the two coils B1, B2 are coplanar. The links L1, L2 ... Ln-1, LT, L2 '... Ln-1' of each coil B1, B2 overlap either from below or from above the segments S1, S2 ... Sn, ST, S2 '... Sn' of the other coil.
    For example, the links L1, L2 ... Ln of the coil B1 overlap from below the segments ST, S2 '... Sn' of the coil B2 in order to connect the segments S1, S2 .. .Sn of the coil B1 between them.
    The segments S1, S2 ... Sn, S1 S2 ... Sn 'are smaller than the dimensions of the transmitting coil13. Preferably, a number of segments S1, S2 ... Sn, S1 S2 '... Sn' is proportional to the number of transmitting coils 13. For example, the number of segments S1, S2 ... Sn, S1 ', S2 '... Sn' is equal to k times the number of transmitting coils 13, with k> 4.
    In a preferred embodiment of the invention, the distinct surfaces SA, SB of the segments, respectively S1, S2 ... Sn, S1 ', S2' ... Sn 'cover the receiving surface S. Let: SA + SB = S.
    With: SA: surface of the segments S1, S2 ... Sn of the first coil B1. SB: surface of the segments S1 ', S2' ..Sn 'of the second coil B2 S: receiving surface.
    As arranged, the passive detection coils B1, B2 are electro-magnetically "neutral", more specifically, the assembly constituted by the passive detection coils B1, B2 does not generate an induced electromagnetic field, although said coils receive the magnetic field emitted by the transmitting coil 13. Indeed, the passive detection coils B1, B2 each emit a field of equal value but of opposite electromagnetic orientation, said fields oppose and cancel each other. The electromagnetic resultant is therefore zero.
    According to the invention, the detection device D also comprises: first means M1 for determining a first quality factor Q1 across the first coil B1; second means M2 for determining a second quality factor Q2 at the terminals of the second coil B2, • third means M3 for determining a third quality factor Qe across the transmitter coil 13, • control means M4 of the first, second, third means M1, M2, M3 Storage means M5 of the first, second and third quality factors Q1, Q2, Qe at predetermined times, calculation means M6 of ratios R1, R1 ', R2, R2' between the first, second and third quality factors Q1, Q2, Qe stored, or between values of quality factors stored at different predetermined times Q1i, Q1f, Q2i, Q2f, Qei, Qef, • comparison means M7 between the ratios R1, R2, R1 ', R2' to detect the presence of a spurious metal object 30 on the receiving surface S.
    The first means M1, the second means M2, the third means M3, the control means M4, the storage means M5, the calculation means M6 and the comparison means M7 can be in the form of software, for example integrated in the management module 14, itself included in a microcontroller.
    The quality factor of a coil is calculated according to the following equation:
    With: Π: constant equal to 3.14; f: measurement frequency of the quality factor Qi of said coil
    Li: inductance of the coil at the measurement frequency f,
    Ri: resistance of the coil to the measurement frequency f
    Or also:
    Qi = tan φ
    With: φ: phase shift between the current and the voltage across the coil
    The method for detecting the presence of a spurious metal object 30 on the receiving surface S of an induction charging device 10 of a battery 21 of a user equipment 20 according to the invention is illustrated in FIG. Figure 4 and is described below.
    In a first step E1, when the management module 14 detects the absence of user equipment 20 on the receiving surface S, the first means M1, the second means M2, the third means M3 respectively measure or determine the first initial quality factor Q1i across the first coil B1, the second initial quality factor Q2i across the second coil B2 and the third initial quality factor Qei across the at least one transmitting coil 13.
    The detection of the absence of user equipment 20 is validated in the following manner: the management module 14 controls the transmission of a "ping", a specific signal, via the transmitter coil 13. The absence of response by a receiver coil 23 to this specific signal means the absence of a user equipment 20 on the receiving surface S.
    As previously explained, the estimation of the quality factor is carried out by measuring the inductance Li and the resistance Ri of the coil at a predetermined measurement frequency f, or from the phase shift φ between the current and the voltage at the terminals of the coil. .
    In a second step, E2 the storage means M5 record in a dedicated memory space the values of the first, second and third initial quality factors Q1i, Q2i, Qei.
    Then when, during a third step E3, the management module 14 detects the presence of the user equipment 20 on the receiving surface S (response of the receiving coil 23 to the "ping" transmitted by the transmitting coil13) then follows the fourth step E4 which consists of the measurement or the determination by the first means M1, the second means M2 and the third means M3 of the first final quality factor Q1f at the terminals of the first coil B1, the second factor of final quality Q2f at the terminals of the second coil B2 and the third final quality factor Qef at the terminals of the at least one transmitting coil 13.
    In a fifth step E5, the calculation means M6 calculate a first mean average between the first initial quality factor Q1i and the second initial quality factor Q2i.
    and a second average moy2 between the first final quality factor Q1f and the second final quality factor Q2f.
    The sixth step E6 then consists of calculating, via the calculation means M6: a first ratio R1, R1 'between the third initial quality factor Qei and the third final quality factor Qef or respectively between the third factor Qei initial quality and the first average moy2, • a second ratio R2, R2 'between the first average average1 and the second average or respectively between the third quality factor Qef and the second average moy2.
    During the final step E7, the comparison means M7 compare the value of the first ratio R1, R1 'with respect to the value of the second ratio R2, R2', respectively.
    Yes :
    Or if :
    With:
    And
    With k1: predetermined constant, between 0.8 and 1. k2: predetermined constant, between 0.8 and 1.
    The constants k1 and k2 are determined beforehand as a function of the transmitting coil 13 (size, shape, type, etc.) and as a function of the accuracy of the measurement means.
    Then, there is a parasitic metal object 30 on the receiving surface S (E7a), otherwise there is no parasitic metal object 30 on the receiving surface S (E7b). The invention therefore lies in the estimation of the impact of the presence of the user equipment 20 on the average quality factor of the passive detection coils B1, B2, this impact, in the absence of parasitic object metal 30 must be substantially the same (to a factor k1, k2 close) as that on the quality factor Qe of the transmitting coil 13.
    When the user equipment 20 and a parasitic metal object 30 are simultaneously present on the reception surface S, then the impact on the quality factor Qe of the transmitting coil 13 is greater than that on the passive sensing coils.
    Indeed, the presence of the parasitic metal object 30 creates an additional loss of the power emitted across the transmitter coil 13 (due to the presence of additional resistivity) that the control module 14 compensates by increasing the power of the which has the effect of lowering the quality factor Qe of the transmitting coil 13. In contrast, the passive detection coils B1, B2 are not connected to any control module 14, they do not adapt , and undergo the presence of the parasitic metal object 30, which reduces the value of the average quality factor of said coils, however, due to the lack of adaptation, of a smaller amplitude than that of the transmitting coil 13. The invention thus makes it possible to reliably and inexpensively detect (two coils and software means) the presence of a parasitic metal object on a receiving surface of a device for recharging a user equipment.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Device for detecting the presence (D) of a parasitic metal object (30) on a receiving surface (S) of a recharging device (10) by induction of a battery (21) of a device vehicle user (20), said charging device (10) comprising a transmission module (12), a management module (14), and a receiving surface (S) of a user equipment ( 20), said transmitting module (12) comprising at least one induction coil-type antenna (13) coupled to the receiving surface (S) and configured to generate an electromagnetic field around the receiving surface (S) in a so-called "transmission" zone (11), said management module (14) of the device (10) being configured to detect the presence of the user equipment (20) on the receiving surface (S) and controlling the transmitting module (12), said detecting device (D) being characterized in that includes: • At least two identical passive detection coils (B1, B2), located between the transmitting coil (13) and the receiving surface (S): - Each coil, a first coil (B1) and a second coil (B2) ) forming a continuous loop, open at its ends and comprising a plurality of identical segments (S1, S2 ... Sn, S1 ', S2' ... Sn ') spaced apart from each other, and interconnected by a link (L1 L1, L1 ', L2' ... Ln-1 '), - said two coils (B1, B2) being superimposed, in two parallel planes (P1, P2), offset from each other; a segment, such that the respective segments (S1, S2 ... Sn, S1 ', S2' ... Sn ') of each coil (B1, B2) cover distinct surfaces (SA, SB) of the surface (S), - The segments (S1, S2 ... Sn, S1 ', S2' ... Sn ') being arranged symmetrically with respect to one of two perpendicular axes (XX Y-Y') intersecting at a center (O) of the reception area n (S), • first means (M1) for determining a first quality factor (Q1) across the first coil (B1), • second means (M2) for determining a second quality factor (Q2) at the terminals of the second coil (B2), • Third means (M3) for determining a third quality factor (Qe) at the terminals of the transmitting coil (13), • Control means (M4) first, second, and third determining means (M1, M2, M3); • storing means (M5) of the first, second and third quality factors (Q1, Q2, Qe) at predetermined times; calculating (M6) ratios (R1, R1 ', R2, R2') between the stored first, second and third quality factors (Q1, Q2, Qe), or between quality factor values stored at predetermined times different (Q1i, Q1f, Q2i, Q2f, Qei, Qef), • Comparison means (M7) between the ratios (R1, R2, R1 ', R2') to detect the presence of a spurious metal object (30) on the receiving surface (S).
    [2" id="c-fr-0002]
    2. Device for detecting (D), the presence of a spurious metal object according to the preceding claim, characterized in that: • the calculation means (M6) calculate: - A first ratio (R1) which is equal ratio between a third initial quality factor (Qei) and a third final quality factor (Qef), - a second ratio (R2) which is equal to the ratio between an average of the first and second initial quality factors (moy1) and a mean of first and second final quality factors (moy2); and the comparison means (M7) compare the first ratio (R1) with the second ratio (R2).
    [3" id="c-fr-0003]
    3. Device for detecting (D), the presence of a spurious metal object according to claim 1, characterized in that: • the calculation means (M6) calculate: - a first ratio (R1 ') which is equal to the ratio between a third initial quality factor (Qei) and an average of the first and second initial quality factors (moy1), - a second ratio (R2 ') which is equal to the ratio between a third final quality factor (Qef), and an average of the first and second final quality factors (moy2), and the comparison means (M7) compare the first ratio (R1 ') with the second ratio (R2').
    [4" id="c-fr-0004]
    4. Device for detecting (D) the presence of a parasitic metal object according to any one of the preceding claims, characterized in that the parallel planes (P1, P2) coincide.
    [5" id="c-fr-0005]
    5. Detection device (D) for the presence of a parasitic metal object, according to any one of the preceding claims, characterized in that the segments (S1, S2, ... Sn) are smaller than the dimensions of the transmitting coil (13).
    [6" id="c-fr-0006]
    6. Detection device (D) for the presence of a parasitic metal object, according to the preceding claim, characterized in that a number of segments (S1, S2 ... Sn) is k times proportional to a number of transmitting coils. (13), with k> 4.
    [7" id="c-fr-0007]
    7. Detection device (D) for the presence of a parasitic metal object, according to any one of the preceding claims, characterized in that a sum of the distinct surfaces (SA, SB) covered by the segments (S1, S2, ... Sn) of said two coils (B1, B2) is substantially equal to the receiving surface (S).
    [8" id="c-fr-0008]
    8. Detection device (D) for the presence of a parasitic metal object, according to any one of the preceding claims, characterized in that the passive detection coils (B1, B2) consist of a single winding of wire of copper.
    [9" id="c-fr-0009]
    9. Detection device (D) for the presence of a parasitic metal object, according to any one of the preceding claims, characterized in that the first determination means (M1), the second determination means (M2), the third determination means (M3), the storage means (M4), the control means (M5), the calculation means (M6) and the comparison means (M7) are in the form of software integrated in the module management (14).
    [10" id="c-fr-0010]
    10. A method for detecting the presence of a parasitic metal object, using the detection device (D) according to any one of the preceding claims, characterized in that said method comprises the following steps: • Step E1: Prior determination of the first initial quality factor (Q1i), the second initial quality factor (Q2i), the third initial quality factor (Q3i) in the absence of user equipment (20) on the receiving surface (S), • Step E2: storing the values of the first initial quality factor (Q1 i), the second initial quality factor (Q2i), the third initial quality factor (Q3i), • Step E3: detecting the presence of a piece of equipment. user (20) on the receiving surface (S), • Step E4: Determining the first final quality factor (Q1f), the second final quality factor (Q2f), the third final quality factor (Q3f), • Step E5 : calculating a first average (moy1) between the first initial quality factor (Q1i) and the second initial quality factor (Q2i), and a second average (moy2) between the first final quality factor (Q1f) and the second final quality factor (Q2f), • Step E6: Calculation of a first ratio (R1, R1 ') between the third initial quality factor (Q3i) and the third final quality factor (Q3f), or between the third initial quality factor (Q3i) and the first average (moy1) and calculating a second ratio (R2, R2 ') between the first average (moy1) and the second average (moy2), or between the third factor final quality (Q3f) and the second average (moy2), • Step 7: If the first ratio (R1, R1 ') is greater, by a factor (k1, k2) predetermined, at the second ratio (R2, R2') , then: - presence of a parasitic metal object (30) on the receiving surface (S), if not - absence of said metal object pa rasite (30).
    [11" id="c-fr-0011]
    11. Motor vehicle, characterized in that it comprises a detection device (D) according to any one of claims 1 to 9.
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    同族专利:
    公开号 | 公开日
    US20180323658A1|2018-11-08|
    KR20180084844A|2018-07-25|
    CN108475945A|2018-08-31|
    FR3043470B1|2017-11-17|
    US10270296B2|2019-04-23|
    WO2017076502A1|2017-05-11|
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    法律状态:
    2016-11-18| PLFP| Fee payment|Year of fee payment: 2 |
    2017-05-12| PLSC| Publication of the preliminary search report|Effective date: 20170512 |
    2017-11-21| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-20| PLFP| Fee payment|Year of fee payment: 5 |
    2020-11-20| PLFP| Fee payment|Year of fee payment: 6 |
    2021-11-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1560669A|FR3043470B1|2015-11-06|2015-11-06|DEVICE FOR DETECTING A PARASITE METAL OBJECT IN THE EMISSION AREA OF A DEVICE FOR RECHARGING A USER EQUIPMENT FOR A MOTOR VEHICLE AND DETECTION METHOD THEREOF|FR1560669A| FR3043470B1|2015-11-06|2015-11-06|DEVICE FOR DETECTING A PARASITE METAL OBJECT IN THE EMISSION AREA OF A DEVICE FOR RECHARGING A USER EQUIPMENT FOR A MOTOR VEHICLE AND DETECTION METHOD THEREOF|
    CN201680077978.5A| CN108475945A|2015-11-06|2016-11-03|The device of the parasitic metal object in emitting area for detecting the user equipment charging unit for being used for motor vehicles and associated detection method|
    PCT/EP2016/001826| WO2017076502A1|2015-11-06|2016-11-03|Device for detecting an interfering metal object in the emission area of a device for recharging a user apparatus for a motor vehicle and detection method|
    US15/773,003| US10270296B2|2015-11-06|2016-11-03|Device for detecting a parasitic metallic object in the emission zone of a device for recharging a user apparatus for an automotive vehicle and associated detection method|
    KR1020187016008A| KR20180084844A|2015-11-06|2016-11-03|Device and method for detecting coherent metal objects in the emissive region of a device that recharges a user device in an automobile|
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