LOW-FREQUENCY EMISSION ELECTRONIC UNIT EMITTING TO A MOBILE WHEEL ELECTRONIC UNIT OF A VEHICLE AND ASSOCIATED LOW-FREQUENCY SIGNAL TRANSMISSION METHOD
First Claim
1. A low-frequency emission electronic unit (20′
- ) emitting to a mobile wheel electronic unit (13) of a vehicle (V), fixed to said wheel (11), said low-frequency emission electronic unit comprising;
a microcontroller (30)a first low-frequency (f) emission antenna (B1), oriented along an axis (Y), connected to the microcontroller (30), having a power supply voltage (Vdd), and emitting a first low-frequency field (D1, D1′
),said low-frequency emission electronic unit (20′
) further comprising;
a second passive low-frequency antenna (B2) arranged along the axis (Y) of the first antenna (B1), situated in a zone of reception of the first low-frequency field (D1, D1′
), regardless of the power supply voltage of the first antenna (B1), and comprising a first part (B2a) and a second part (B2b), electrically linked together, separated by a gap (E) having a length (l), the two parts (B2a, B2b) being adapted to emit low-frequency fields of opposite directions (C2a, C2b), and directed toward one another,means (M1) for adapting a frequency (f′
) of the second antenna (B2) to the frequency (f) of the first antenna (B1),means (M2) for regulating the power supply voltage (Vdd) of the first antenna (B1);
means (M3) for controlling the adaptation means (M1) and the regulation means (M2).
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Accused Products
Abstract
A low-frequency emission electronic unit (20′) includes two low-frequency antennas (B1, B2). The second antenna (B2) is passive and resonant, oriented along the main axis (Y) of the first low-frequency antenna (B1) and is adapted to generate two low-frequency fields (D2, D2′) at right angles to the field (D1) emitted by the first antenna (B1). The low-frequency emission electronic unit (20′) makes it possible to reduce the zones of rupture of reception of the low-frequency signals by the wheel unit (13) situated in proximity in which the low-frequency signals emitted by the low-frequency emission electronic unit are not received by the closest wheel unit (13). A low-frequency signal transmission method alternating the emissions of waves by the two antennas (B1, B2) is also described.
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Citations
9 Claims
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1. A low-frequency emission electronic unit (20′
- ) emitting to a mobile wheel electronic unit (13) of a vehicle (V), fixed to said wheel (11), said low-frequency emission electronic unit comprising;
a microcontroller (30) a first low-frequency (f) emission antenna (B1), oriented along an axis (Y), connected to the microcontroller (30), having a power supply voltage (Vdd), and emitting a first low-frequency field (D1, D1′
),said low-frequency emission electronic unit (20′
) further comprising;a second passive low-frequency antenna (B2) arranged along the axis (Y) of the first antenna (B1), situated in a zone of reception of the first low-frequency field (D1, D1′
), regardless of the power supply voltage of the first antenna (B1), and comprising a first part (B2a) and a second part (B2b), electrically linked together, separated by a gap (E) having a length (l), the two parts (B2a, B2b) being adapted to emit low-frequency fields of opposite directions (C2a, C2b), and directed toward one another,means (M1) for adapting a frequency (f′
) of the second antenna (B2) to the frequency (f) of the first antenna (B1),means (M2) for regulating the power supply voltage (Vdd) of the first antenna (B1); means (M3) for controlling the adaptation means (M1) and the regulation means (M2). - View Dependent Claims (2, 3, 4, 5, 8, 9)
the first switch (S1) 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.
- ) emitting to a mobile wheel electronic unit (13) of a vehicle (V), fixed to said wheel (11), said low-frequency emission electronic unit comprising;
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4. The low-frequency emission electronic unit (20′
- ) as claimed in claim 1, wherein the adaptation means (M1) comprise;
a second switch (S2), a frequency adaptation circuit 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 adaptation circuit and an open position in which the second antenna (B2) is disconnected from the adaptation circuit.
- ) as claimed in claim 1, wherein the adaptation means (M1) comprise;
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5. The low-frequency emission electronic unit (20′
- ) as claimed in claim 1, wherein a length (l1) of the first part (B2a) is equal to a length (l2) of the second part (B2b) and the length (l) of the gap (E) is between ⅛
th and ⅝
th of the length (l1) of the first part (B2a) or of the length (l2) of the second part (B2b).
- ) as claimed in claim 1, wherein a length (l1) of the first part (B2a) is equal to a length (l2) of the second part (B2b) and the length (l) of the gap (E) is between ⅛
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8. A system for monitoring the pressure of the tires, which comprises a central unit (12), at least one wheel electronic unit (13), and at least one low-frequency emission electronic unit (20′
- ) as claimed in claim 1.
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9. A motor vehicle, which comprises a low-frequency emission electronic unit (20′
- ) as claimed in claim 1.
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6. A method for transmitting low-frequency signals from a low-frequency emission electronic unit (20′
- ) to a mobile wheel electronic unit (13) of a vehicle (V), fixed to said wheel (11), said low-frequency emission electronic unit comprising;
a microcontroller (30) a first low-frequency emission antenna (B1) of frequency f, oriented along an axis (Y), connected to the microcontroller (30), having a power supply voltage (Vdd), and emitting a first low-frequency field (D1, D1′
),wherein, in a preliminary step, the low-frequency emission electronic unit (20′
) is equipped;with a second passive low-frequency antenna (B2) arranged along the axis (Y) of the first antenna (B1), situated in a zone of reception of the first low-frequency field (D1, D1′
), regardless of the power supply voltage of the first antenna (B1), and comprising a first part (B2a) and a second part (B2b), electrically linked together, separated by a gap (E) having a length (l), the two parts (B2a, B2b) being adapted to emit low-frequency fields of opposite directions (C2a, C2b), and directed toward one another,means (M1) for adapting a frequency (f′
) of the second antenna (B2) to the frequency (f) of the first antenna (B1),means (M2) for regulating the power supply voltage (Vdd) of the first antenna (B1) making it possible to regulate the power supply voltage of the first antenna (B1) either to a nominal voltage, or to a voltage lower than the nominal voltage, means (M3) for controlling the adaptation means (M1) and the regulation means (M2), and said method comprises the following steps; step 1;
activation of the regulation means (M2) in order to power 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) in order to power 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 the steps 1 to 4.- View Dependent Claims (7)
- ) to a mobile wheel electronic unit (13) of a vehicle (V), fixed to said wheel (11), said low-frequency emission electronic unit comprising;
Specification