• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The subject of the present invention is an electronic low frequency emission unit (20 ') comprising two low frequency antennas (B1, B2). The second antenna (B2) being passive and resonant, oriented along the main axis (Y) of the first low frequency antenna (B1) and being adapted to generate two low frequency fields (D2, D2 ') perpendicular to the field (D1) transmitted by the first antenna (B1). The low frequency electronic emission unit (20 ') according to the invention makes it possible to reduce the low frequency signal reception failure zones by the neighboring wheel unit (13) in which the low frequency signals emitted by the electronic low frequency emission unit are not received by the nearest wheel unit (13). The invention also applies to a method of transmitting low frequency signals alternating wave emissions by the two antennas (B1, B2).
    公开号:FR3030906A1
    申请号:FR1462588
    申请日:2014-12-17
    公开日:2016-06-24
    发明作者:Mohamed Cheikh；Sebastien Kessler
    申请人:Continental Automotive GmbH；Continental Automotive France SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to an electronic low-frequency emission unit for an electronic wheel unit of a vehicle and to a low frequency signal transmission method between said electronic transmission unit (that it will be called "transmitter unit") and the electronic receiving wheel unit (which will be called "wheel unit"). Wheel electronic units (called "wheel units") currently have the functionality to inform a centralized electronic control unit (which will be called "central unit") on various parameters relating to the wheel, such as tire pressure, gas temperature inside the tire or wheel temperature, the ground footprint of the tire, for example the length of this impression along the plane of the wheel. These wheel units 13 (see FIG. 1) generally equip each wheel 11 of the vehicle 10 (see FIG. 3) and are generally fixed inside the tire against its tread, and are provided with means making it possible to record the moment where this tread comes into contact with the ground S and the moment when it leaves the ground S, by the induced radial displacement of the tread. These means are for example an accelerometer or a shock sensor or the like associated with the wheel unit 13, which measures, in the case of the accelerometer, for example, the difference in radial acceleration when the tread comes into contact with the soil S and leave this contact.
    [0002] The wheel unit 13 is provided with at least one pressure sensor 17 (often also with a temperature sensor), and also includes (but is not limited to): - a micro processor, - a signal receiving antenna 15 low frequency BF, an RF radio frequency signal transmission antenna (not shown) (see FIG. 3), and a battery (not shown) supplying all of these elements. The wheel unit 13 may also include other sensors as cited above, for example, an accelerometer.
    [0003] The central unit 12, mounted on the vehicle V, is provided with at least: - a radio frequency reception antenna 16 (see FIG. 3), - a microprocessor calculator, and is electrically connected to four low frequency electronic emission units 20 (see FIG. 3), that is to say four emitting units 20.
    [0004] This central unit 12 is powered by the vehicle battery V. Each of the transmitter units 20 is fixedly located on the vehicle V near a wheel unit 13. Each transmitter unit 20 comprises a low frequency transmission antenna, and a microcontroller electrically connected to said transmitting antenna. The transmitting unit 20 may, in some cases, include only the low frequency transmission antenna, electrically connected to the computer, located in the central unit 12. At a fixed frequency, the central unit 12 controls the sequential transmission BF low frequency interrogation signals through the transmitter units to each of the wheel units 13. Each wheel unit 13 sequentially transmits, one after the other, then RF (generally high frequency) radio frequency signals. to the central unit 12 so that the latter informs the driver in the event of abnormal measured parameters, and also so that this central unit 12 can locate the position of each wheel unit 13 on the vehicle V during the life of the associated tire to the wheel 11, this even in case of change of position of the wheel 11 on the vehicle V. During the rotation of a wheel 11, and a wheel of the wheel 11, there are generally p Arti fi ces of the wheel unit 13 in which the reception by the wheel unit 13, BF signals sent by the emitter unit 20 closest is not done, called low frequency break zones Zo (cf. 1), which correspond to a breaking zone of reception of the RF signal. This may be true for each wheel 11 of the same vehicle V in a different and unpredictable manner. By convention, however, there is a limited acceptance of the number and duration of the break zones Zo for a turn of the wheel 11. For example, a break zone Zo of about 1 ° per revolution of the wheel is generally accepted. In particular cases, this number can be increased to two break zones Zo each of the order of 1 ° maximum per wheel revolution 11. In FIG. 2 is illustrated an example of the intensity Rfi of the low frequency signal BF received. by the receiving antenna 15 of the wheel unit 13 according to the rotation angle 0 of the wheel, on a complete wheel revolution (360 °), also called receiving pattern. In this example, the break zone Zo appears at around 225 °, the intensity RFi of the low frequency signal BF is then insufficient for the wheel unit 13 to receive the signal BF. A vehicle V without zone of rupture Zo and where the reception rate BF by the wheel unit 13 reaches 100 (3/0 is in fact not representative of the reality. low-frequency receiving antenna 15, and the transmitting unit 20 has a single low-frequency signal-emitting antenna BF, generally in the form of a longitudinal copper coil surrounding a ferrite, which transmits the BF signals in a single The break zone Zo corresponds to a momentary position of the wheel unit 13 on the wheel 11, for which the orientation of the wheel unit 13 is such that the direction of reception of the receiving antenna 15 of said wheel unit 13 does not allow the reception of the low frequency signals BF sent by the transmitting unit 20. A solution of the prior art consists in equipping the transmitting unit 20 with a second transmitting antenna, fixed perpendicular to the transmission unit. antenna will emit already present in the transmitting unit 20. The two antennas have perpendicular transmission directions. This makes it possible to increase the probability of reception of the signals BF by the wheel unit 13 and to reduce the rupture zone Zo. With a second antenna, the rate of reception of the signals BF by the wheel unit 13 is close to 100%. However, the addition of a second low frequency antenna in the transmitter unit 20 with its associated electronic control circuit, represents a significant cost. The transmitter unit 20 also becomes more cumbersome because of the additional space allocated to the second antenna, perpendicular to the antenna already present, its integration on the vehicle V becomes less easy. Another solution of the prior art consists in equipping the wheel unit 13 with a second antenna for receiving signals BF, perpendicular to the reception antenna 15 already present in the wheel unit 13. real disadvantage of space, and the integration of the wheel unit 13 in the tire 11 against the tread becomes difficult. The present invention proposes an electronic low-frequency emission unit 20, fixed on a vehicle V, to a mobile electronic wheel unit of said vehicle V and a transmission method applicable to one or more low-frequency signals. BF between said electronic emission unit 20 and the wheel unit 13 to improve the reception performance of said low frequency waves by the wheel unit 13. Improving the reception performance is to ensure that the low frequency signals BF transmitted can be statistically received by the wheel unit 13 within a defined minimum period of time, and regardless of the speed of the vehicle to a predetermined maximum speed, for example 250 km / h. The invention proposes an electronic unit for low-frequency emissions intended for an electronic unit of a mobile wheel of a vehicle, fixed on said wheel, said electronic low-frequency emission unit comprising: a microcontroller, a first antenna A low-frequency, axis-oriented, transmission unit connected to the microcontroller having a supply voltage and emitting a first low frequency field, said low frequency emission electronic unit being remarkable in that it further comprises: a second passive low-frequency antenna disposed along the axis of the first antenna, located in a reception zone of the first low-frequency field, whatever the supply voltage of the first antenna, and comprising a first part and a second part; , Electrically interconnected, separated by a gap having a length, the two parts being adapted to emit Controlled low-frequency fields of direction directed towards each other; means for adapting a frequency of the second antenna to the frequency of the first antenna; means for regulating the voltage of the antenna; feeding the first antenna; means for controlling the adaptation means and the regulation means. Judiciously, the first antenna and the second antenna are coaxial and wound around a single ferrite. In a preferred embodiment, the voltage regulation means comprise: a first two-way switch, connected on one side to a voltage generator integrated in the microcontroller, and connected on the other side; first nominal voltage circuit, comprising a first resistor, - a second voltage circuit lower than the nominal voltage, comprising a second resistor; the first switch having a first position in which the first antenna is connected to the first circuit and a second position in which the first antenna is connected to the second circuit. And the adaptation means comprise: a second switch; a frequency matching circuit comprising: a capacitor; a third resistor; the second switch having a closed position in which the second antenna is connected to the circuit; adaptation and an open position in which the second antenna is disconnected from the matching circuit. Preferentially; a length of the first part is equal to a length of the second part and the length of the gap is between 1 / 8th and 5 / 8th of the length of the first part or the length of the second part. The invention also relates to a low frequency signal transmission method of an electronic low frequency emission unit, intended for an electronic unit of a mobile wheel, of a vehicle, fixed on said wheel, said electronic unit 10 of low frequency transmissions comprising: - a microcontroller, - a first low frequency transmission antenna, oriented along an axis, connected to the microcontroller, having a supply voltage, and emitting a first low frequency field, the method being remarkable in that in a prior step, equip the low-frequency electronic transmission unit with: - a second passive low-frequency antenna arranged along the axis of the first antenna, located in a reception zone of the first low-frequency field, the supply voltage of the first antenna, and having a first part and a second part electrically connected to one another , separated by a gap having a length, the two parts being adapted to emit low frequency fields of opposite direction, and directed towards one another, - means for adapting a frequency of the second antenna to the Frequency of the first antenna; means for regulating the supply voltage of the first antenna; enabling the supply voltage of the first antenna to be regulated at a nominal voltage or at a voltage lower than the nominal voltage; means for controlling the adaptation means and the regulation means. Said method comprising the following steps: - Step 1: Activation of the regulating means to supply the first antenna with a nominal voltage for a first predetermined duration, - Step 2: Deactivation of the regulation means, 35 - Step 3: Activation regulating means for supplying the first antenna with a voltage lower than the nominal voltage and activating the adaptation means simultaneously for a second predetermined duration, - Step 4: deactivating the regulating means and deactivating the adaptation means simultaneously . Step 5: repetition of steps 1 to 4. Preferentially: step 1 consists in connecting the first switch to the nominal voltage circuit; step 2 consists in disconnecting the first switch from the nominal voltage circuit; step 3 consists of connecting the first switch to the voltage circuit less than the nominal voltage and closing the second switch, - step 4 consists of the disconnection of the first switch to the voltage circuit below the nominal voltage simultaneously when opening the second switch. The invention also applies to any tire pressure monitoring system, comprising a central unit, at least one wheel electronic unit, and at least one low frequency electronic emission unit according to one of the listed characteristics. above. Finally, the invention relates to any motor vehicle comprising an electronic low frequency emission unit according to one of the characteristics listed above. Other characteristics and advantages of the invention will appear on reading the following description and on examining the appended drawings in which: FIG. 1, explained above, represents a schematic view of a wheel equipped with A wheel unit 13, illustrating a break zone Zo, according to the prior art, FIG. 2, explained above, represents a schematic view of the intensity of the low frequency signal received by the wheel unit according to the angle of rotation of the wheel, according to the prior art, FIG. 3 represents a schematic view of a vehicle equipped with a wheel unit and a central unit; FIG. 4 represents a schematic view of an electronic unit; 5 shows a schematic view of the first antenna and the second antenna of the low frequency electronic transmission unit according to the invention, FIG. 6 represents a schematic view of ue the intensity of the low frequency signal received by the wheel unit, according to the invention. According to the embodiment shown in FIG. 3, a vehicle 10 is conventionally provided with four tires 11. Each of these tires 11 is equipped with a wheel unit 13. The vehicle 10 is also provided with a central unit 12 and four low frequency electronic transmission units 20.
    [0005] The central unit 12, the wheel units 13 and the emitting units 20 belong to a tire pressure monitoring system 11. This system is adapted to regularly measure the pressure (and temperature) prevailing inside the tires, in order to inform the driver of the vehicle 10 of any anomaly. Each wheel unit 13 comprises for this purpose a pressure sensor 17 and a temperature sensor (not shown). This system is known in itself, it will not be detailed here. The transmitter units 20 each in turn send, at the request of the central unit 12, an interrogation message to the nearest wheel unit 13. This interrogation message is sent by low frequency waves.
    [0006] The wheel units 13 then measure the temperature and the pressure prevailing inside the tires 11 by means of the pressure sensors 17 and temperature and transmit the measured values (possibly pre-processed) to the central unit 12 by RF signals ( radio frequency) of frequency of the order of 433 MHz or 315 MHz, using their radio frequency transmitting antenna. The central unit 12 receives, with the aid of a radio frequency antenna 16, the RF signals emitted by the wheel units 13, processes them and informs the driver of any anomaly. It should be noted that the central unit 12 and the wheel units 13 are not connected to each other by a wired network. Similarly, the transmitter units 20 and the wheel units 13 are not connected to each other by a wired network.
    [0007] As explained above, the wheel unit 13 of the prior art, equipped with a single antenna 15 has the disadvantage of having a rupture zone Zo (see FIG. 1) on the wheel 11 in which the low frequency signals BF emitted by the antenna of the transmitting unit 20 are not received by the wheel unit 13. To overcome this drawback, the invention proposes an emitter unit 20 'as shown in FIG. comprises, as in the prior art: - a microcontroller 30, - a first low frequency transmission antenna B1 of frequency f, in the form of a copper coil, surrounding a ferrite F ', extending according to a Y axis. Said first antenna B1 is supplied on one side with alternating voltage Vdd by a voltage generator G integrated in the microcontroller 30 and on the other side said first antenna B1 is connected to a capacitor Ci, itself connected to the mass. The capacitance Cl makes it possible to adjust the transmission frequency f of said first antenna Bi. For explanatory purposes, it is considered in this example that the transmitter unit 20 'comprises a microcontroller 30 which manages the transmission of low frequency signals by the first antenna Bi. Generally, the transmitting unit 20 'comprises only a transmitting antenna B1 which is connected to the microcontroller of the central unit 12, said microcontroller managing the transmission of the low frequency signals by the transmitting unit 20'. The first antenna B1 generates a first low frequency field D1 directed along the Y axis (see FIG. 4). According to the invention, the transmitting unit 20 'furthermore comprises: a second low-frequency transmission antenna B2, f', adaptation means M1 of the frequency f 'of the second antenna B2 at the frequency f of the first antenna Bi, 20 - regulation means M2 of the supply voltage Vdd of the first antenna Bi, - control means M3, adaptation means M1 and regulation means M2, for example integrated in the microcontroller 20 '. The second antenna B2 is a passive antenna. It is not powered. It is, for example, in the form of a copper winding. The second antenna B2 is located in the reception zone of the low frequency field D1 emitted by the first antenna Bi, whatever the supply voltage Vdd of the first antenna Bi. The second antenna B2 consists of a single copper wire. It comprises two parts B2a and B2b, for example two copper windings, electrically connected to one another by the copper wire and separated by a gap E of length I. The two parts, the first winding B2a and the second winding B2b are designed or adapted, when the second antenna B2 emits low frequency waves (the emission conditions of the second antenna B2 are explained below), to generate low frequency fields C2a, C2b of opposite directions and directed to one the other.
    [0008] For example, the first winding B2a of length 11 is made in a first winding direction, and the second winding B2b of length 12 is formed in the opposite direction to the first winding direction. The second winding B2b is separated from the first winding B2a by the gap E of length 1, and electrically connected to the first winding by said copper wire along said gap E. More specifically, the copper wire is not wound in either the first direction or in the opposite direction at the level of the gap E. Preferably, the lengths of the two windings B2a, B2b are equal to each other, 11 = 12 and the length 1 of the distance E is between 1 / 8th and 5 / 8th of the length 11 of the first coil B2a, or the length 12 of the second coil B2b (see FIGS. 4 and 5). As illustrated in FIG. 5, the first winding B2a generates a first low-frequency field C2a directed along the Y axis towards the gap E. The second winding B2b generates a second low-frequency field C2b, the direction of which according to FIG. Y axis, is opposite that of the first low frequency field C2a and directed towards the gap E. The two low frequency fields C2a, C2b are directed towards one another; are encountered at the distance E and generate a second low frequency field D2 and a third low frequency field D2 'perpendicular to the Y axis and oriented at 1800 from each other (see FIG.
    [0009] Thus, the second antenna B2, because of its geometry (two windings B2a, B2b producing fields directed towards one another) emits two low frequency fields D2 and D2 'perpendicular to the Y axis, that is to say ie perpendicular to the first low frequency field D1 emitted by the first antenna B1. The regulating means M2 of the supply voltage Vdd upstream of the first antenna B1 consist of a first dual-channel switch Si connected on one side to the voltage generator G, and on the other side, according to the position of said first switch S-1 to one of two circuits connected in parallel, both connected to a first end of the first antenna B1 (see FIG. 4): a first nominal voltage circuit comprising a first circuit resistor R1, a second voltage circuit lower than the nominal voltage comprising a second resistor R2. With R2 "Ri. In another embodiment, the regulating means M2 of the supply voltage Vdd may comprise a variable resistor for adjusting the supply voltage to either the nominal voltage or the voltage lower than the nominal voltage.
    [0010] Thus, when the first switch is connected to the first nominal voltage circuit, the first antenna B1 is supplied with a nominal voltage. The first antenna B1 sends the first low frequency field D1 to the central unit 12, as in the prior art.
    [0011] When the first switch Si is connected to the second circuit, the first antenna B1 is powered by a voltage much lower than the nominal voltage. In this case, the first antenna B1 then emits a new low frequency field D1 'of low range, insufficient to be received by the wheel unit 12, but of sufficient scope to be received by the second antenna B2, located near the first antenna B1. Indeed, the second antenna B2 is located in the receiving zone of the new low frequency field D1 'emitted by the first antenna B1, whatever the supply voltage of the first antenna B1, even if this one is less than the nominal voltage. In a preferred embodiment, the first and second antenna B1, B2 are coaxial and wound around the same ferrite F '(see Figure 5).
    [0012] The ferrite F 'makes it possible to increase the intensity of the low frequency fields D1, D2, D2' emitted by the first and the second antenna B1, B2. The second antenna B2 is then electromagnetically coupled to the first antenna B1 and resonantly emits the second and third radio frequency field D2, D2 '.
    [0013] For this purpose, the second antenna B2 is connected to means for adapting its frequency f 'to the frequency F of the first antenna B1. The adaptation means M1 for adapting the frequency f 'of the second antenna B2 comprise, for example: a second switch S2, connected on one side to a first end of the second antenna B2, and on the other side to a frequency matching circuit comprising: an adaptation element, for example a capacitor O2 connected to the switch S2, a third resistor R3 connected on one side to the capacitor O2 and on the other side to a second end of the second antenna B2. When the second switch S2 is closed, the second antenna B2 is connected to the frequency matching circuit, that is to say connected in series, the capacitor O2 and the resistor R3.
    [0014] The value of the capacitor O2 is determined in order to adjust the frequency f 'of the second antenna B2 to the frequency f of the first antenna B1. Thus the second antenna B2 is a resonant antenna, which, when the second switch S2 is closed and the first switch S1 is connected to the first circuit, receives a part of the new field D1 'low frequency emitted by the first antenna B1 and emits at its turn a second and third low frequency field D2, D2 'at the same frequency f. The resistor R3 is optional, it is of low value so as not to limit the voltage flowing through the second antenna B2 and not to limit the range of the second and third low frequency fields D2, D2 '. Thus, the second and third low frequency fields D2, D2 'are of sufficient range to be received by the central unit 12. The operation of the electronic wheel unit 11 according to the invention is described below. In a first step, the first switch Si is in a first position in which it electrically connects the voltage generator G to the first circuit (in which the resistor R1 is of low value). The second switch S2 is open, the second antenna B2 does not work. The first antenna B1 emits a first low frequency field D1 oriented along the Y axis. In a second transition step, the first switch is disconnected from the first circuit. In a third step, the first switch Si is in a second position in which it electrically connects the voltage generator G to the second circuit (in which there is a resistor R2 of higher value than the resistor R1). The second switch S2 is then closed simultaneously, and the second antenna 62 functions as a resonant antenna. The first antenna B1 emits a new low frequency field D1 'oriented along the Y axis but very short range. The second antenna B2 receives the new low frequency field D1 '25 emitted by the first antenna B1 and in turn transmits, by resonance, a second and a third low frequency field D2, D2' both perpendicular to the axis Y, destined of the central unit 12 at the same frequency f. In a fourth transition step, the first switch S1 is disconnected from the second circuit and the second switch S2 is open.
    [0015] Steps 1 to 4 are repeated continuously on a wheel revolution. The first and third steps are of predetermined durations, t1, t2 which may be equal to, for example 20 ms. The method of transmitting low frequency waves from the transmitter unit 20 'to the wheel unit 13, according to the invention therefore comprises the following steps: Step 1: Activation of the regulation means M2 to feed the first antenna B1 with a nominal voltage for a first predetermined duration t1, - Step 2: Deactivation of the regulation means M2, - Step 3: Activation of the regulation means M2 to supply the first antenna B1 with a voltage lower than the nominal voltage and activation of the adaptation means M1 simultaneously for a second predetermined duration t2, - Step 4: deactivation of the regulation means M2 and deactivation of the adaptation means M1 simultaneously. Step 5: repetition of steps 1 to 4. In step 1, the term "activation of the regulating means" means the connection between the first switch S1 and the first nominal voltage circuit in order to supply the voltage. first antenna B1 with a nominal voltage. In step 2, the deactivation of the regulation means means that the first switch S1 is no longer electrically connected to any circuit. In step 3, the activation of the regulating means means that the first switch S1 is electrically connected to said second circuit, thereby supplying the first antenna B1 with a voltage lower than the nominal voltage. It is accompanied by the simultaneous activation of the adaptation means M1 which means closing the second switch S2, to connect the second antenna B2 to the frequency matching circuit, comprising the capacitor C2 and the resistor R3.
    [0016] The activation and deactivation of the regulation means and the adaptation means are controlled by the control means M3 integrated in the microcontroller 20 '. Thus the wheel unit 13 'according to the invention sequentially emits a first low frequency field D1 oriented along the Y axis, then a second and third low frequency field D2, D2' perpendicular to the Y axis. In FIG. 6 , is illustrated the reception pattern of the wheel unit 13 according to the invention, that is to say the intensity Rfi low frequency signals BF received on a wheel revolution. The first field D1 emitted by the first antenna B1 has a rupture zone Zo at 225 °, the second field D2 emitted by the second antenna B2 has a second rupture zone Zo2 at 270 °. The field constituted by the meeting of said two low frequency fields D, D2 does not have a breaking zone on a wheel revolution. By alternating the emission of the low frequency waves BF of the transmitting unit 20 ', by the first antenna B1 and then by the second antenna B2, there is no longer a breaking zone on a wheel revolution.
    [0017] Thus the probability of reception of the low frequency signals BF by the wheel unit 13 on a wheel revolution is increased. The zone of rupture Zo is considerably reduced or even eliminated. Since the second antenna B2 is passive, it is of low cost, moreover being oriented along the same axis Y as that of the first antenna B1, and not perpendicularly to said first antenna B1, the size of the transmitting unit 20 'according to FIG. invention is reduced. The invention thus allows the reliable transmission of low frequency signals BF 5 between the transmitting unit and the wheel unit on a complete wheel revolution, without the presence of a rupture zone.
    权利要求:
    Claims (9)
    [0001]
    REVENDICATIONSI. An electronic low-frequency emission unit (20 ') for a mobile electronic wheel unit (13) of a vehicle (V), fixed on said wheel (11), said low frequency electronic transmission unit comprising: a microcontroller (30) - a first low frequency transmission antenna (B1), oriented along an axis (Y), connected to the microcontroller (30), having a supply voltage (Vdd), and emitting a first low frequency field (D1, D1 '), said low frequency electronic transmission unit (20') being characterized in that it further comprises: - a second passive low frequency antenna (B2) arranged along the axis (Y) of the first antenna (B1), located in a receiving area of the first low frequency field (D1, D1 '), whatever the supply voltage of the first antenna (B1), and having a first part (B2a) and a second part (B2b), electrically connected to each other, separated p ar a gap (E) having a length (I), the two parts (B2a, B2b) being adapted to emit opposite low frequency fields of direction (C2a, C2b), and directed towards each other, - means for adapting (M1) a frequency (f ') of the second antenna (B2) to the frequency (f) of the first antenna (B1), regulating means (M2) for the voltage of power supply (Vdd) of the first antenna (B1); control means (M3) of the adaptation means (M1) and regulation means (M2). 25
    [0002]
    2. Low frequency electronic emission unit (20 '), according to the preceding claim, characterized in that the first antenna (B1) and the second antenna (B2) are coaxial and wound around a single ferrite (F') .
    [0003]
    3. Low-frequency electronic emission unit (20 '), according to any one of the preceding claims, characterized in that the regulation means (M2) of the voltage comprise: a first two-way switch (Si) connected on one side to a voltage generator (G) integrated in the microcontroller (30), and connected on the other side: - a first nominal voltage circuit, comprising a first resistor (R1), - a second circuit voltage lower than the nominal voltage, comprising a second resistor (R2); the first switch (Si) having a first position in which the first antenna (B1) is connected to the first circuit and a second position in which the first antenna (B2) is connected to the second circuit.
    [0004]
    4. Low frequency emission electronic unit (20 '), according to any one of the preceding claims, characterized in that the adaptation means (M1) comprise: - a second switch (S2), 15 - a circuit frequency adaptation comprising: - a capacitor (C2), - a third resistor (R3), the second switch (S2) having a closed position in which the second antenna (B2) is connected to the matching circuit and an open position wherein the second antenna (B2) is disconnected from the matching circuit.
    [0005]
    5. Low frequency electronic emission unit (20 '), according to any one of the preceding claims, characterized in that a length (11) of the first portion (B2a) is equal to a length (12) of the second part (B2b) and the length (1) of the difference (E) is between 1 / 8th and 5 / 8th of the length (11) of the first part (B2a) or the length (12) of the second part (B2b).
    [0006]
    6. A method for transmitting low frequency signals of an electronic low-frequency emission unit (20 ') to a mobile electronic wheel unit (13) of a vehicle (V) fixed on said wheel ( 11), said low frequency electronic emission unit comprising: a microcontroller (30) a first frequency-based low frequency transmission antenna (B1) connected to the microcontroller (30) , having a power supply voltage (Vdd), and emitting a first low frequency field (D1, D1 '), the method being characterized in that the low frequency transmission electronics unit (20') is equipped in a previous step ): a second passive low frequency antenna (B2) disposed along the axis (Y) of the first antenna (B1), located in a reception zone of the first low frequency field (D1, D1 '), whatever the supply voltage of the first antenna (B1), and comprising a first part (B2a) and a second part (B2b), electrically connected to each other, separated by a gap (E) having a length (I), the two parts (B2a, B2b) being adapted to emit opposite low frequency fields of direction (C2a, C2b), and directed toward each other, - means (M1) for adapting a frequency (f ') of the second antenna (B2) to the frequency (f) of the first antenna (B1), - regulating means (M2) of the supply voltage (Vdd) of the first antenna (B1) making it possible to regulate the supply voltage of the first antenna (B1) either at a nominal voltage or at a voltage lower than the nominal voltage, - control means (M3) of the adaptation means (M1) and the regulating means (M2). and in that said method comprises the following steps: - Step 1: Activation of the regulating means (M2) in order to supply the first antenna (B1) with a nominal voltage for a first predetermined duration (t1), - Step 2: Deactivation of the regulation means (M2), - Step 3: Activation of the regulation means (M2) to feed the first antenna (B1) with a voltage lower than the nominal voltage and activation of the adaptation means (M1) simultaneously for a second predetermined duration (t2), - Step 4: deactivation of the regulation means (M2) and deactivation of the adaptation means (M1) simultaneously. Step 5: repetition of steps 1 to 4.
    [0007]
    7. Transmission method according to the preceding claim, using the device according to claim 4 characterized in that: - step 1 consists of the connection of the first switch (Si) to the nominal voltage circuit, - step 2 consists of disconnecting the first switch (Si) from the nominal voltage circuit; - step 3 consists of connecting the first switch (Si) to the voltage circuit that is lower than the nominal voltage and closing the second switch (S2); step 4 consists in the disconnection of the first switch (Si) to the voltage circuit less than the nominal voltage simultaneously with the opening of the second switch (S2),
    [0008]
    Tire pressure monitoring system, characterized in that it comprises a central unit (12), at least one electronic wheel unit (13), and at least one low frequency electronic transmission unit (20 '). ) according to any one of claims 1 to 5.
    [0009]
    9. Motor vehicle, characterized in that it comprises a low frequency electronic emission unit (20 ') according to any one of claims 1 to 5.
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    同族专利:
    公开号 | 公开日
    US9669667B2|2017-06-06|
    FR3030906B1|2016-12-23|
    CN105711349B|2017-12-22|
    US20160176247A1|2016-06-23|
    CN105711349A|2016-06-29|
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    法律状态:
    2015-12-21| PLFP| Fee payment|Year of fee payment: 2 |
    2016-06-24| PLSC| Publication of the preliminary search report|Effective date: 20160624 |
    2016-12-22| PLFP| Fee payment|Year of fee payment: 3 |
    2017-12-21| PLFP| Fee payment|Year of fee payment: 4 |
    2019-12-19| PLFP| Fee payment|Year of fee payment: 6 |
    2020-12-23| PLFP| Fee payment|Year of fee payment: 7 |
    2021-12-24| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1462588A|FR3030906B1|2014-12-17|2014-12-17|LOW FREQUENCY EMISSION ELECTRONICS UNIT FOR A VEHICLE MOBILE WHEEL ELECTRONIC UNIT AND METHOD FOR TRANSMITTING RELATED LOW FREQUENCY SIGNALS|FR1462588A| FR3030906B1|2014-12-17|2014-12-17|LOW FREQUENCY EMISSION ELECTRONICS UNIT FOR A VEHICLE MOBILE WHEEL ELECTRONIC UNIT AND METHOD FOR TRANSMITTING RELATED LOW FREQUENCY SIGNALS|
    US14/968,035| US9669667B2|2014-12-17|2015-12-14|Low-frequency emission electronic unit emitting to a mobile wheel electronic unit of a vehicle and associated low-frequency signal transmission method|
    CN201510940745.0A| CN105711349B|2014-12-17|2015-12-16|The low frequency signal transmission method of low frequencies electronic unit and correlation|
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