Method for activating a function of a vehicle by ultra high frequency with an item of portable user equipment and device for activating an associated function

1. An ultra-high frequency-based method for activating a function of a vehicle with a portable item of user equipment comprising an accelerometer, said method comprising:

a) detecting a characteristic movement of the portable item of equipment associated with a command to activate a function of the vehicle, the characteristic movement consisting of a predetermined value of successive taps by the user on the portable item of equipment within a predetermined time interval;

b) measuring the successive taps by the user on the portable item of equipment by the accelerometer;

c) comparing signals from the accelerometer representative of the measured successive taps by the user on the portable item of equipment with a predetermined signature; and

d) checking the establishment of ultra-high frequency communication between the portable item of equipment and the vehicle,

i) If communication is established, then transmitting a command to activate the function of the vehicle to the vehicle in order to activate said function,

ii) If communication is not established within the predetermined time interval following detection of the characteristic movement, then the method is stopped.

2. The activation method as claimed in claim 1 , wherein the comparison is performed between a value derived from a resulting acceleration from the accelerometer signals transmitted along three mutually orthogonal axes and a maximum value.

3. The activation method as claimed in claim 1 , wherein the derived value consists of a maximum value of the resulting acceleration over a predetermined duration, or of an integral of the resulting acceleration over time over a predetermined duration.

4. A non-transitory computer program product, comprising a set of program code instructions that, when they are executed by one or more processors, configure the one or more processors so as to implement an ultra-high frequency-based method for activating a function of a vehicle with a portable item of user equipment comprising an accelerometer, said method comprising:

a) detecting a characteristic movement of the portable item of equipment associated with a command to activate a function of the vehicle, the characteristic movement consisting of a predetermined value of successive taps by the user on the portable item of equipment within a predetermined time interval;

b) measuring the successive taps by the user on the portable item of equipment by the accelerometer;

c) comparing signals from the accelerometer representative of the measured successive taps by the user on the portable item of equipment with a predetermined signature; and

d) checking the establishment of ultra-high frequency communication between the portable item of equipment and the vehicle,

i) If communication is established, then transmitting a command to activate the function of the vehicle to the vehicle in order to activate said function,

ii) If communication is not established within the predetermined time interval following detection of the characteristic movement, then the method is stopped.

5. A portable item of user equipment comprising:

an ultra-high frequency communication antenna;

ultra-high frequency transmission and reception means;

determination means for determining a characteristic movement associated with a command to activate a function of the vehicle, the characteristic movement consisting of a predetermined value of successive taps by the user on the portable item of user equipment within a predetermined time interval;

an accelerometer configured to measure the successive taps by the user on the portable item of user equipment and generate signals representative of the measured successive taps by the user on the portable item of user equipment;

analysis means configured to analyze the signals from the accelerometer; and

comparison means for comparing the analyzed signals from the accelerometer with a predetermined signature.

6. The portable item of user equipment as claimed in claim 5 , wherein the analysis and comparison means comprise calculating a resulting acceleration and a value derived from said resulting acceleration and comparison means for comparing said derived value with a maximum value.

7. A device for activating a vehicle function intended to be housed on board a vehicle, the device comprising:

at least one ultra-high frequency communication antenna;

a control unit equipped with ultra-high frequency transmission and reception means; and

unlocking/locking means for performing unlocking/locking on the basis of the data received by the antenna from the portable item of user equipment,

wherein the received data comprise a command to activate a function of the vehicle, based on detection of a characteristic movement of the portable item of equipment, the characteristic movement consisting of a predetermined value of successive taps by the user on the portable item of equipment, and

wherein the portable item of user equipment comprises an accelerometer configured to measure the successive taps by the user on the portable item of user equipment and generate signals representative of the measured successive taps by the user on the portable item of user equipment.

8. A motor vehicle, comprising a device for activating a vehicle function intended to be housed on board a vehicle, the device comprising:

at least one ultra-high frequency communication antenna;

a control unit equipped with ultra-high frequency transmission and reception means;

and unlocking/locking means for performing unlocking/locking on the basis of the data received by the antenna from the portable item of user equipment,

wherein the received data comprise a command to activate a function of the vehicle, based on detection of a characteristic movement of the portable item of equipment, the characteristic movement consisting of a predetermined value of successive taps by the user on the portable item of equipment, and

wherein the portable item of user equipment comprises an accelerometer configured to measure the successive taps by the user on the portable item of user equipment and generate signals representative of the measured successive taps by the user on the portable item of user equipment.