Method for characterizing a portable device by way of an antenna on board a motor vehicle
First Claim
1. A method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a mobile device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, approaching said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of said mobile device (20), and generating a voltage (V) across its terminals, said voltage (V) being linked to an on-board system (11) of the motor vehicle (10), the method comprising the following steps:
- step 1;
measuring by the on-board system (11) the voltage (V) across the terminals of the primary antenna (13, 31), over a series of predetermined time periods (Δ
t1, Δ
t2),step 2;
computing by the on-board system (11) a voltage difference (Δ
V) for each predetermined time period (Δ
t1, Δ
t2),step 3;
comparing by the on-board system (11), for each predetermined time period (Δ
t1, Δ
t2), the voltage difference (Δ
V) thus computed with a value previously stored in the memory and,step 4;
determining whether the mobile device is of dielectric type or metallic type,if the voltage difference (Δ
V) is positive, then the mobile device (20) is of dielectric type,if the voltage difference (Δ
V) is negative, then the mobile device (20) is of metallic type,step 5;
once the type of the mobile device has been characterized, determining whether the mobile device is in static approach mode or dynamic approach mode,if the voltage difference (Δ
V) is zero over a predetermined time period (Δ
t2), which is above a time threshold (Δ
th1) then the mobile device (20) is in static approach mode,otherwise the mobile device (20) is in dynamic approach mode.
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Accused Products
Abstract
A method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a mobile device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, approaching said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of the mobile device (20), and generating a voltage (V) across its terminals, the voltage being linked to an on-board system (11) of the motor vehicle (10), the invention proposes that the method of characterization comprises the following steps:
- step 1: measurement by the on-board system (11) of the voltage across the terminals of the primary antenna (13, 31), over a series of predetermined time periods,
- step 2: computation of a voltage difference for each predetermined time period,
- step 3: comparison of the voltage difference with a value previously stored in the memory,
- step 4: if the voltage difference is positive, then the mobile device (20) is of dielectric type, otherwise if it is negative, it is of metallic type,
- step 5: if the voltage difference is zero over a predetermined time period above a threshold, then the mobile device (20) is in static approach mode, otherwise it is in dynamic approach mode.
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Citations
12 Claims
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1. A method for characterizing, by way of at least one primary antenna (13, 31) on board a motor vehicle (10), a mobile device (20) of indeterminate type comprising a secondary antenna (21) of indeterminate size, approaching said motor vehicle (10) in an indeterminate approach mode, said primary antenna (13, 31) being intended to communicate with the secondary antenna (21) of said mobile device (20), and generating a voltage (V) across its terminals, said voltage (V) being linked to an on-board system (11) of the motor vehicle (10), the method comprising the following steps:
-
step 1;
measuring by the on-board system (11) the voltage (V) across the terminals of the primary antenna (13, 31), over a series of predetermined time periods (Δ
t1, Δ
t2),step 2;
computing by the on-board system (11) a voltage difference (Δ
V) for each predetermined time period (Δ
t1, Δ
t2),step 3;
comparing by the on-board system (11), for each predetermined time period (Δ
t1, Δ
t2), the voltage difference (Δ
V) thus computed with a value previously stored in the memory and,step 4;
determining whether the mobile device is of dielectric type or metallic type,if the voltage difference (Δ
V) is positive, then the mobile device (20) is of dielectric type,if the voltage difference (Δ
V) is negative, then the mobile device (20) is of metallic type,step 5;
once the type of the mobile device has been characterized, determining whether the mobile device is in static approach mode or dynamic approach mode,if the voltage difference (Δ
V) is zero over a predetermined time period (Δ
t2), which is above a time threshold (Δ
th1) then the mobile device (20) is in static approach mode,otherwise the mobile device (20) is in dynamic approach mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification