METHOD FOR ACTIVATING A VEHICLE FUNCTION AND ASSOCIATED DEVICE

Abstract

The invention proposes a method of activating a vehicle function, by an activation device (D), from a "hands-free" access equipment (SD) worn by a user (U), the activation of the function being triggered by a detection of the user pressing on a contact surface (S) of the vehicle, and according to an authentication result of the equipment;the device comprising at least one transceiver (EM1) located under the contact surface (S) capable of communicating with said equipment in ultra-wideband (ULB), the method comprising the following steps: a) Emission of waves towards said equipment, b) Reception of reflected waves, c) Comparison over a predetermined time interval (ΔT), i) of the phase values ​​(φ) of the reflected waves with a predetermined phase value profile, said profile exhibiting a phase rotation, and ii) of the amplitude values ​​(A) of the reflected waves with a predetermined amplitude value profile, said profile exhibiting an amplitude increase, d) Detection of user contact with the contact surface based on the results of said comparisons, e) Activation of the vehicle function if contact has been detected. Figure for the abbreviation: Fig. 2;

Claims

Claims

1. Method for activating a vehicle function, by an activation device (D), from a “hands-free” access device (SD) carried by a user (U), the activation of the function being triggered by a detection of the user pressing on a contact surface (S) of the vehicle, and depending on an authentication result of the equipment (SD), the activation device comprising at least one transmitter receiver (EM1) located under the contact surface (S) capable of communicating with said equipment (SD) in ultra wide band (ULB), the method being characterized in that it comprises the following steps: a. Ultra-wideband transmission of waves to said equipment, b. Reception of reflected waves, c. Comparison for a predetermined duration (AT), i. phase values ​​(q>) of the reflected waves with a predetermined phase value profile, said profile exhibiting a phase rotation, and ii. amplitude values ​​(A) of the reflected waves with a predetermined amplitude value profile, said profile having an increase in amplitude, d. Detection of user support on the contact surface (S) based on the result of said comparisons, e. Activation of the vehicle function if support has been detected.

2. Activation method, according to the preceding claim, characterized in that a phase rotation corresponds to a variation of the phase values ​​between -180° to -270° during the predetermined duration (AT).

3. Activation method, according to any one of the preceding claims, characterized in that an increase in amplitude corresponds to a variation in the amplitude values ​​above a threshold (AAs) during the predetermined duration (AT).

4. Device (D) for activating a vehicle function, adapted to be embedded in a motor vehicle (V), the activation of the function being triggered by detection of pressure from the user (U) on a contact surface (S) of the vehicle, and depending on a result authentication of the equipment (SD), the activation device comprising at least one transmitter receiver (EM1) located under the contact surface (S) capable of communicating with said equipment (SD) in ultra wide band (ULB), the device (D) being characterized in that it comprises: a. Means for receiving (Ml) reflected ultra-wideband waves b. Comparison means (M2) for a predetermined duration (AT), phase values ​​(q>) of the reflected waves with a predetermined phase profile, said profile having a phase rotation, c. Comparison means (M3) for the predetermined duration (AT(, amplitude values ​​(A) of the reflected waves with a predetermined amplitude value profile, said profile exhibiting an increase in amplitude, d. Means (M4) for detecting the user's pressure on the contact surface (S) based on the results of said comparison, e. Means of activation (M5) of the vehicle function if support has been detected.

5. Activation device (D) according to the preceding claim, characterized in that the means (M2) for comparing the phase values ​​of the reflected waves compare said values ​​with a phase rotation of between -180° and -270° during the predetermined duration (AT).

6. Activation device (D) according to any one of claims 4 or 5, characterized in that the means for comparing (M3) the amplitude values ​​(A) compare said values ​​with an increase in amplitude above a threshold (AAs) during the predetermined duration (AT).

7. A computer program product comprising program code instructions for executing the steps of the method according to any one of claims 1 to 3 when said program is executed on a computer.

8. Motor vehicle (V), characterized in that it comprises an activation device (D) according to claims 4 to 6.

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