Abstract: A method for locating wheels of a motor vehicle. The vehicle including at least one central processing unit which includes a main ultra-wideband radio frequency transceiver and a plurality of wheel units, each including a secondary ultra-wideband radio frequency transceiver adapted for communicating with the main transceiver. The method includes at least one step of measuring the distance between the main transceiver and the secondary transceiver to be located, by analyzing the propagation time of an exchanged message, and a step of locating the wheel unit associated with the secondary transceiver to be located, on the basis of the distance measured in the measurement step.

Abstract: A method for detecting the opening of the openable sections of a motor vehicle by a detection device. The device includes at least two ultra-high-frequency communication modules, each located on a different openable section and connected to an electronic computer. An opening angle of a first openable section is determined based on: a first distance between a rotation point of the first openable section on which a first communication module is located and a position of a second module when the two openable sections associated with the two modules are closed; a second distance between a rotation point of the first openable section and a position of the first module on the openable section; a distance between the two modules when the two openable sections associated with the two modules are closed; a distance between the modules, determined by a time of flight of ultra-high-frequency radiation exchanged between the modules.

Abstract: A method for activating a function of a motor vehicle by an activation device on the vehicle having at least one communication unit including at least one radiofrequency antenna and transmission and reception device. The activation coming from a user's portable device. The activation of the function is triggered by detection of the user's presence in a predetermined zone around the vehicle and on the basis of a result of authentication of the portable device by the vehicle.

Abstract: A computer for a motor vehicle. The vehicle including a plurality of wheels, at least one of the wheels including a sensor for measuring at least one value of a “pitch” parameter, enabling the computer to determine a “pitch” coordinate of the sensor along a predetermined “pitch” axis orthogonal to the direction of movement of the vehicle and parallel to the plane of the road. The computer being capable of receiving from the sensor at least one value of the pitch parameter, determining at least one pitch coordinate of the sensor on the basis of the at least one value received, detecting a geometric anomaly in the wheel including the sensor when at least one determined pitch coordinate is outside a first predetermined range of values of coordinates on the pitch axis.

Abstract: A method for communicating between a portable transmission device and an electronic control unit of a motor vehicle. The method includes transmission, by the transmission device, of a plurality of wake-up signals over a plurality of consecutive time intervals referred to as “reference” time intervals. The duration of each reference time interval being equal to the duration of a supply period and each reference time interval being divided into a series of consecutive time slots. At least one wake-up signal of the plurality of wake-up signals being transmitted in each reference time interval, in a time slot that is different from the time slots of the other wake-up signals of the plurality of wake-up signals, and such that the sum of the transmission time intervals of each of the wake-up signals of the plurality of wake-up signals is at least equal to the supply period.

Abstract: A method for locating wheels of a motor vehicle. The vehicle including at least one central processing unit which includes a main ultra-wideband radio frequency transceiver and a plurality of wheel units, each including a secondary ultra-wideband radio frequency transceiver adapted for communicating with the main transceiver. The method includes at least one step of measuring the distance between the main transceiver and the secondary transceiver to be located, by analyzing the propagation time of an exchanged message, and a step of locating the wheel unit associated with the secondary transceiver to be located, on the basis of the distance measured in the measurement step.

Abstract: A UHF communication method for activating a motor vehicle function with a portable item of user equipment, based on the presence of the portable item of equipment in predetermined areas around the vehicle. The portable item transmitting a first signaling event at a predetermined period on at least one signaling channel. The first event including at least one signaling frame having a data block. The method including: a predetermined number of additional signaling events transmitted to the vehicle during the period; a request signal received from the vehicle, for each signaling frame of each event received by the vehicle; sending a response frame upon receipt of the request signal by the portable item; determining the presence of the portable item in one of the predetermined areas based on the strength values of the received signal; activating a vehicle function based on the determined presence of the portable item of equipment.

Abstract: A corner sensor for a motor vehicle capable of communicating over a wireless communication link with an authentication device and including: an array of antennae; and an electronic control unit configured to: determine the phase difference between the segments received by the antennae; determine the probability of each angle of incidence over a range of angles that is predetermined on the basis of the determined phase differences and of a predefined table, so as to determine a probability profile; measure the power of the segments received by the antennae of the array of antennae so as to determine a power profile; determine the actual angle of incidence of the signal by multiplying the probability profile with the power profile; and send the value of the determined actual angle of incidence to a central electronic control unit of the vehicle.

Abstract: A UHF communication method for activating a motor vehicle function with a portable item of user equipment, based on the presence of the portable item of equipment in predetermined areas around the vehicle. The portable item transmitting a first signaling event at a predetermined period on at least one signaling channel. The first event including at least one signaling frame having a data block. The method including: a predetermined number of additional signaling events transmitted to the vehicle during the period; a request signal received from the vehicle, for each signaling frame of each event received by the vehicle; sending a response frame upon receipt of the request signal by the portable item; determining the presence of the portable item in one of the predetermined areas based on the strength values of the received signal; activating a vehicle function based on the determined presence of the portable item of equipment.

Abstract: A method for the remote control, by way of a mobile communication terminal equipped with a UHF-SHF module, of a secure motor vehicle function requiring a user to be present within a security perimeter around the vehicle, the vehicle being equipped with an access device including a control unit and an access fob. The method includes: detecting the presence of the access fob within the security perimeter around the vehicle through LF transmission between the vehicle and the access fob; detecting the presence of the mobile communication terminal at a distance less than a predetermined distance from the access fob, through a communication operation between the access fob and the mobile communication terminal; remotely controlling, by way of the mobile communication terminal, the secure function of the vehicle on the UHF-SHF frequency band.

Abstract: A process for detecting a portable user device in a predetermined zone on the inside or outside of a vehicle by a detection device onboard the vehicle. The high-frequency, BLE type communication includes a first signaling mode and a second communication mode, the first mode including: positioning the portable device at a predetermined fixed distance from the detection device, transmitting a signal by the detection device with predetermined transmission power on a channel. As long as the detection device is receiving a response signal from the portable device, repeating transmission of the signal at the same transmission power on other channels, otherwise, repeating transmission of the signal on a channel with reduced transmission power, and if the detection device no longer receives a response signal, comparing the transmission power to a predetermined threshold transmission power, and applying a correction to the transmission power during the second mode.

Abstract: A corner sensor for a motor vehicle capable of communicating over a wireless communication link with an authentication device and including: an array of antennae; and an electronic control unit configured to: determine the phase difference between the segments received by the antennae; determine the probability of each angle of incidence over a range of angles that is predetermined on the basis of the determined phase differences and of a predefined table, so as to determine a probability profile; measure the power of the segments received by the antennae of the array of antennae so as to determine a power profile; determine the actual angle of incidence of the signal by multiplying the probability profile with the power profile; and send the value of the determined actual angle of incidence to a central electronic control unit of the vehicle.

Abstract: A system for detecting the operation of the motor or engine of a motor vehicle equipped with at least one tire-pressure-monitoring-system transmitter including: a low-frequency stage including a resonant stage connected in series with an antenna, a processing stage, a first switch and a second switch, the first switch being connected to at least two capacitors so as to control the parallel connection of at least one of the capacitors, the second switch being connected to at least two resistors so as to control the parallel connection of at least one of the resistors, outputs of the low-frequency stage being arranged to receive input from the processing stage, in order to transfer the perceived signal to a processor of the signal, which is configured to compare the level of the perceived signal to a preset threshold level.

Abstract: A method for detecting and estimating an angle of rotation on itself, about a mounting axis, of a wheel unit with an acceleration sensor, the wheel unit being associated with a tire mounted on a rim, forming a wheel, the sensor detecting a gravitational force during the rotation of the wheel, forming a sinusoid. The wheel unit is mounted on the wheel with the acceleration sensor directly or indirectly inclined with respect to a plane tangential to the rim. The angle of rotation on itself of said wheel unit and therefore of the acceleration sensor at a given instant is estimated by comparing at least one parameter of the sinusoids that are obtained for the wheel unit in an initial mounting position on the wheel and in its position at this given instant, respectively.

Abstract: A method for identifying at least one emitter for monitoring the tire pressure of a motor vehicle by association with one of the wheels of the motor vehicle. The method includes: for each emitter monitoring tire pressure, reconstructing an intermediate-frequency signal from the radiofrequency signal and a reference signal, determining the FFT of the intermediate-frequency signal, determining whether there is a frequency deviation of the intermediate-frequency signal, determining the side of the vehicle on which the emitter monitoring the pressure of a tire is placed, acquiring a signal from the anti-lock braking system for at least one of the wheels on the side on which it was determined that the emitter for monitoring the pressure of a tire is placed, and determining the position of the emitter for monitoring the pressure of a tire depending on the deviation and on the at least one signal from the anti-lock braking system.

Abstract: A method for detecting the presence of a human hand on an opening element of a motor vehicle. The method includes determination of a power variation profile and detection of the presence of a human hand on the opening element being performed when the determined profile corresponds to a predetermined reference profile characterized by an increase followed by a first decrease in the power value, characterizing the approach of a human hand, followed by a stagnation and a second decrease in the power value, characterizing contact of a human hand with the opening element of the vehicle.

Abstract: A system for detecting the operation of the motor or engine of a motor vehicle equipped with at least one tire-pressure-monitoring-system transmitter including: a low-frequency stage including a resonant stage connected in series with an antenna, a processing stage, a first switch and a second switch, the first switch being connected to at least two capacitors so as to control the parallel connection of at least one of the capacitors, the second switch being connected to at least two resistors so as to control the parallel connection of at least one of the resistors, outputs of the low-frequency stage being arranged to receive input from the processing stage, in order to transfer the perceived signal to a processor of the signal, which is configured to compare the level of the perceived signal to a preset threshold level.

Abstract: A method for detecting the presence of a human hand on an opening element of a motor vehicle. The method includes determination of a power variation profile and detection of the presence of a human hand on the opening element being performed when the determined profile corresponds to a predetermined reference profile characterized by an increase followed by a first decrease in the power value, characterizing the approach of a human hand, followed by a stagnation and a second decrease in the power value, characterizing contact of a human hand with the opening element of the vehicle.

Abstract: A method for determining the start of movement of a motor vehicle equipped with a system for monitoring tire pressure of a motor vehicle. Communication between the receiver and each pressure monitoring system emitter being subjected to a Doppler effect so that a periodic component is inserted by the emitter into the signal emitted to the receiver. The method includes: acquiring the intermediate-frequency signal before demodulation by a processor to extract data carried by the radiofrequency signal, determining the FFT of the IF signal, determining the average value of the FFT of the IF signal over a preset duration, and determining whether there is a frequency deviation by comparing the instantaneous value of the fast Fourier transform to the average value of the fast Fourier transform, if so, determining whether the emitter for monitoring the pressure of a tire is moving and that the vehicle is moving.

Abstract: A process for detecting a portable user device in a predetermined zone on the inside or outside of a vehicle by a detection device onboard the vehicle. The high-frequency, BLE type communication includes a first signaling mode and a second communication mode, the first mode including: positioning the portable device at a predetermined fixed distance from the detection device, transmitting a signal by the detection device with predetermined transmission power on a channel. As long as the detection device is receiving a response signal from the portable device, repeating transmission of the signal at the same transmission power on other channels, otherwise, repeating transmission of the signal on a channel with reduced transmission power, and if the detection device no longer receives a response signal, comparing the transmission power to a predetermined threshold transmission power, and applying a correction to the transmission power during the second mode.