Device for a two-way detection of the approach of a portable apparatus for hands-free access to a vehicle and associated detection method
First Claim
1. A device for the bidirectional detection of the approach of a portable apparatus for near-field hands-free access to a vehicle, said device comprising:
- a communication antenna having a near-field communication frequency and a predetermined quality factor and maximum bandwidth so as to communicate with said portable apparatus,a reader, linked to a microcontroller, and the portable apparatus being equipped with wireless near-field communication means,a first passive inductive sensor, directed toward an outside of the vehicle, having a first resonant frequency situated within a window with a value around the communication frequency and different from said communication frequency, and having a first quality factor greater than the quality factor of the communication antenna,a second passive inductive sensor, directed toward an inside of the vehicle, having a second resonant frequency situated within a window with a value around the communication frequency and different from the communication frequency and different from the first resonant frequency, and having a second quality factor greater than the quality factor of the communication antenna,the first passive inductive sensor and the second passive inductive sensor being situated opposite one another, separated by a ferrite, and receiving an electromagnetic field emitted by the communication antenna,means for measuring a first voltage across terminals of the first passive inductive sensor and means for measuring a second voltage across the terminals of the second passive inductive sensor, andmeans for comparing between the first voltage and the second voltage so as to detect the approach of the portable apparatus coming from outside or coming from inside the vehicle.
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Accused Products
Abstract
A device for two-way detection of the approach of a portable apparatus for near-field hands-free access to a vehicle, said device including a communication antenna having a near-field communication frequency, the device including: a first passive inductive sensor oriented towards the outside of the vehicle, a second passive inductive sensor oriented towards the inside of the vehicle, the two sensors being arranged so as to face one another, separated by a ferrite, and receiving the electromagnetic field emitted by the communication antenna, and being capable of detecting the approach of the portable apparatus; a device for measuring a first voltage across the terminals of the first sensor and a device for measuring a second voltage across the terminals of the second sensor; a device for comparing the first voltage and the second voltage in order to detect the approach of the portable apparatus coming from outside or coming from inside the vehicle.
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Citations
12 Claims
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1. A device for the bidirectional detection of the approach of a portable apparatus for near-field hands-free access to a vehicle, said device comprising:
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a communication antenna having a near-field communication frequency and a predetermined quality factor and maximum bandwidth so as to communicate with said portable apparatus, a reader, linked to a microcontroller, and the portable apparatus being equipped with wireless near-field communication means, a first passive inductive sensor, directed toward an outside of the vehicle, having a first resonant frequency situated within a window with a value around the communication frequency and different from said communication frequency, and having a first quality factor greater than the quality factor of the communication antenna, a second passive inductive sensor, directed toward an inside of the vehicle, having a second resonant frequency situated within a window with a value around the communication frequency and different from the communication frequency and different from the first resonant frequency, and having a second quality factor greater than the quality factor of the communication antenna, the first passive inductive sensor and the second passive inductive sensor being situated opposite one another, separated by a ferrite, and receiving an electromagnetic field emitted by the communication antenna, means for measuring a first voltage across terminals of the first passive inductive sensor and means for measuring a second voltage across the terminals of the second passive inductive sensor, and means for comparing between the first voltage and the second voltage so as to detect the approach of the portable apparatus coming from outside or coming from inside the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification