Method and device for automatically locking the doors of a vehicle
First Claim
1. A hands-free method of locking/unlocking the exits of a vehicle (1) comprising:
- a) the transmission by a unit on board the vehicle (1) of a first radio frequency signal, called request signal (10);
b) the transmission by an identifying device (2), mobile relative to the vehicle (1), of a second radio frequency signal, called presence signal (20), in response to the reception of the request signal (10);
c) the transmission by the identifying device (2) of a third radio frequency signal, called a locking signal (21), if the request signal (10) is not received within a time interval within which such a request signal is expected;
characterized in that it further comprises;
d) at least one measurement by the identifying device (2) of the intensity (12) of the radio frequency field B received by said identifying device in the frequency domain of the request signal (10);
e) the inhibition of the transmission of the locking signal (21), that is, the noncompletion of the step c) of the method, if the intensity (12) of the radio frequency field B is greater than a threshold value S when the expected request signal (10) is not received.
1 Assignment
0 Petitions
Accused Products
Abstract
To avoid the untimely locking of the exits of a vehicle 1 using a hands-free locking/unlocking device by detecting the proximity to the vehicle of an identifying device 2, the method comprises measurement of the radio frequency noise level present on the antenna of the identifying device in the frequency range of the request signals transmitted by the system on board the vehicle 1.
When the noise level is sufficiently high and the request signal is not received by the identifying device 2, the transmission of the locking signal, which is normally transmitted when the request signal stops being received because of the distance of the identifying device 2 from the vehicle 1, is inhibited.
18 Citations
14 Claims
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1. A hands-free method of locking/unlocking the exits of a vehicle (1) comprising:
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a) the transmission by a unit on board the vehicle (1) of a first radio frequency signal, called request signal (10); b) the transmission by an identifying device (2), mobile relative to the vehicle (1), of a second radio frequency signal, called presence signal (20), in response to the reception of the request signal (10); c) the transmission by the identifying device (2) of a third radio frequency signal, called a locking signal (21), if the request signal (10) is not received within a time interval within which such a request signal is expected; characterized in that it further comprises; d) at least one measurement by the identifying device (2) of the intensity (12) of the radio frequency field B received by said identifying device in the frequency domain of the request signal (10); e) the inhibition of the transmission of the locking signal (21), that is, the noncompletion of the step c) of the method, if the intensity (12) of the radio frequency field B is greater than a threshold value S when the expected request signal (10) is not received. - View Dependent Claims (2, 3, 4, 5, 6, 9, 10, 11, 12, 13, 14)
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7. A hands-free device for locking/unlocking the exits of a vehicle (1), comprising:
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a unit on board the vehicle (1) suitable for transmitting a periodic radio frequency signal, called request signal (10); at least one identifying device (2), mobile relative to the vehicle suitable for receiving the request signal, suitable for transmitting a radio frequency signal called presence signal (20) in response to the reception of a request signal (10) and suitable for transmitting at least one radio frequency signal called locking signal (21) when the identifying device (2) stops receiving request signals (10), characterized in that the mobile identifying device (2) comprises; means of measuring the radio frequency field B in the frequency domain of the request signals, means for comparing the value (12) of the measured radio frequency field B with a threshold value S, and means for inhibiting the transmission of the locking signal (21) when said value of the measured radio frequency field is greater than said threshold S, when an expected request signal (10) is not received. - View Dependent Claims (8)
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Specification