Abstract: The invention relates to a method of processing measurement signals from a movement senor on board a motor vehicle, according to which, initially, and in a preliminary phase, a reference value AcOff, called offset value, is stored, representative of the value of the signal output by the movement sensor, with the vehicle stopped, a so-called noise value Bb representative of the white noise of said sensor, and an acceleration value Sa determining a running threshold of the motor vehicle.

Abstract: The invention relates to a method for filtering information emitted, on the basis of pressure measurements taken by a pressure sensor mounted on a wheel of a vehicle equipped with a tire, to a central unit mounted on the vehicle. According to this method, a value representative of the pressure of the air in the tire is measured periodically, with a period ?, and from this any possible variations ?P in pressure between the values of the pressures successively measured are deduced; in parallel, with the same period ?, a value representative of the temperature of the air in the tire is measured. In addition, when there is a variation ?P in pressure between two measured pressure values, that is greater in terms of absolute value than a predetermined threshold Sp, the variation ?T between the two temperature values measured at the same instants as the measured pressures is calculated.

Abstract: A method of processing measurement signals from a movement sensor on board a motor vehicle, wherein in a preliminary phase, a reference offset value is stored, representative of the value of the signal output by the sensor, with the vehicle stopped, a noise value representative of the white noise of the sensor, and an acceleration value determining a running threshold of the vehicle. Then, throughout the life of the vehicle, sequences of successive measurements are taken of the value of the signal output by the sensor, and, for each sequence, the stored offset value is subtracted from each measure value and each calculated value is compared with the stored running threshold. Information representative of a stopped state is transmitted only if, the calculated values are less than the stored running threshold and roughly equal to each other with a tolerance margin corresponding to the stored noise value.

Abstract: When a vehicle travels a bend, tire pressure measurement devices (2) are assigned to wheel positions. For this purpose, it is determined by means of ABS (4) whether it is a left-hand or right-hand bend. Wheel revolution counts are then measured in each tire and sent along with identification codes to a central analysis unit (3). There the wheel revolution counts are collated with the bend data determined by the ABS. The two higher wheel revolution counts are then assigned to the side of the vehicle on the outside of the bend and the two lower wheel revolution counts are assigned to the other side of the vehicle.

Abstract: The invention relates to a method for filtering information emitted, on the basis of pressure measurements taken by a pressure sensor mounted on a wheel of a vehicle equipped with a tire, to a central unit mounted on said vehicle. According to this method, a value representative of the pressure of the air in the tire is measured periodically, with a period ?, and from this any possible variations ?P in pressure between the values of the pressures successively measured are deduced; in parallel, with the same period ?, a value representative of the temperature of the air in the tire is measured. In addition, when there is a variation ?P in pressure between two measured pressure values, that is greater in terms of absolute value than a predetermined threshold Sp, the variation ?T between the two temperature values measured at the same instants as said measured pressures is calculated.

Abstract: The device comprises: a sensor arranged at the level of each tire whose pressure is to be monitored, a transmitter associated with each sensor, and a common receiver intended to receive the information sent by the transmitters, at least one detector device making it possible to detect a transmission in the transmission frequency range of the transmitters associated with the sensors, and each detector device being linked to a central unit in such a way as to be able to send this central unit a signal indicating that a transmission in the relevant frequency range is detected.

Abstract: A method of automatic location of the right and left wheels of a motor vehicle of the type comprising a step of automatic measurement of the centripetal acceleration of a wheel, the method being characterized in that it consists in comparing the theoretical centripetal acceleration (Ai) of a wheel in a straight line with the measured centripetal acceleration (Aiv) of this same wheel when cornering for a given vehicle speed (V), and for a given steering wheel angle (T), so as to determine whether the wheel is on the right or on the left of the vehicle.

Abstract: The invention relates to a method for automatically determining the position of the wheels of a motor vehicle (10), characterised in that it consists in:—measuring (21) the temperature of each wheel (12) of the vehicle; and determining (23) the position of the wheels on the vehicle according to the temperature measured. The invention also relates to a corresponding position-finding device. The device is particularly suitable for monitoring the pressure inside tires.

Abstract: The method is carried out in a vehicle or similar, comprising the following steps: detection of the state of the vehicle (2) when stopped, the sensor measures a parameter such as pressure (6), the result of the measurement is stored in the sensor (10), the sensor analyses the measurement according to previous measurements (8), significant results of the analysis are stored inside the sensor (10), and when the vehicle begins once more to travel, significant data relating to events occurring since the last detected stop of the vehicle is transmitted (14) from the sensor to the central unit wherever applicable.

Abstract: The invention relates to a method for automatically determining the position of the wheels of a motor vehicle (10), characterised in that it consists in:—measuring (21) the temperature of each wheel (12) of the vehicle; and determining (23) the position of the wheels on the vehicle according to the temperature measured. The invention also relates to a corresponding position-finding device. The device is particularly suitable for monitoring the pressure inside tires.

Abstract: The present invention relates to a method of automatic location of the right and left wheels of a motor vehicle of the type comprising a step of automatic measurement of the centripetal acceleration of a wheel, said method being characterized in that it consists in comparing the theoretical centripetal acceleration (Ai) of a wheel in a straight line with the measured centripetal acceleration (Aiv) of this same wheel when cornering for a given vehicle speed (V), and for a given steering wheel angle (T), so as to determine whether said wheel is on the right or on the left of the vehicle.

Abstract: When a vehicle travels a bend, tire pressure measurement devices (2) are assigned to wheel positions. For this purpose, it is determined by means of ABS (4) whether it is a left-hand or right-hand bend. Wheel revolution counts are then measured in each tire and sent along with identification codes to a central analysis unit (3). There the wheel revolution counts are collated with the bend data determined by the ABS. The two higher wheel revolution counts are then assigned to the side of the vehicle on the outside of the bend and the two lower wheel revolution counts are assigned to the other side of the vehicle.

Abstract: The device comprises:

Abstract: A liquid spraying device including an elongate first vessel closed at one of its ends by a first free face of a piezoelectric transducer capable of emitting waves into a liquid filling the vessel, and open at its end remote from the piezoelectric transducer. The piezoelectric transducer includes a second free face opposite its first free face, and wherein an elongate second vessel is disposed symmetrically to the first vessel relative to the piezoelectric transducer, the second vessel being closed at one of its ends by said second free face of the piezoelectric transducer, which is thus also capable of emitting waves into a liquid filling the second vessel, said second vessel being open at its end remote from the piezoelectric transducer.

Abstract: The invention relates to a spraying device including a tank which is open at its upper part, capable of containing a liquid to be sprayed, such as water, while being filled up to its opening, a piozoelectric element capable of emitting waves into the liquid and fan means for creating a circulation of air in the vicinity of the surface of the liquid. The waves are focused in the vicinity of the opening of the tank, and the cross-section of the tank (1) has a progressive constriction towards the opening (2) of the tank (1).