Abstract: The invention concerns a system for determining inflating pressure of tires mounted on a motor vehicle front and rear wheels. Said system comprises means (12, 14) for acquiring inflating pressures of the front and rear wheels, means (16, 18) for acquiring vertical accelerations of the front and rear wheels, and means (32) for emerging the acquired pressures and the acquired accelerations to estimate the inflating pressures of the front and rear tires.

Abstract: The invention concerns a system for determining inflating pressures of tires mounted on a motor vehicle wheels, which includes acquiring vertical accelerations of a front wheel and of a rear wheel of the vehicle and estimating coefficients of stiffness of the tires of these wheels based on the acquired accelerations on another of the acquired accelerations, these coefficients of stiffness being estimated based on the thus temporally reset accelerations.

Abstract: The invention concerns a method for diagnosing the condition of at least one tire of a vehicle wheel connected to the body shell thereof via a suspension, including, for the or each tire, a step (102) of acquiring the vertical acceleration of the wheel in a reference model of the vehicle. Said method includes a step (108) of filtering the acquired acceleration to eliminate the frequencies thereof lower than a predetermined filtering frequency, a step (110) of determining a vertical excitation applied to the tire based on the filtered acceleration, and a step (112, 114, 116, 118, 120) of determining the condition of the tire based on the determined excitation.

Abstract: The invention concerns a device for measuring the rotational speed of a vehicle wheel, comprising a housing (22), a printed circuit board (32) accommodated in the housing and an encoder cell (38) mounted on the printed circuit board and adapted to measure electromagnetic field variations. The device comprises at least one accelerometer (44;46) mounted on the printed circuit board (32) for measuring an acceleration along a first predetermined axis. The accelerometer may be mounted inclined relative to the plane of the printed circuit board.

Abstract: The invention concerns a method for diagnosing the condition of tires of a front wheel and of a rear wheel of a motor vehicle arranged on the same side of the vehicle and connected to the body shell thereof via suspension means. Said method includes a step (102) of acquiring the vertical acceleration of said wheels in a reference model of the vehicle, a step (104) of time-based resetting of one of the acquired accelerations on the other of the acquired accelerations, a step (112) of estimating the coefficients of stiffness of the tires based on the thus temporally reset accelerations, and a step (120) of determining the condition of the tires based on the estimated coefficients of stiffness.

Abstract: The invention concerns a device for measuring a quantity representing the rotational speed of a motor vehicle wheel (14ag, 14ad, 14rg, 14rd), comprising means (22ag, 22ad, 22rg, 22rd) for coding and measuring the rotational speed in the form of electromagnetic pulses, means (24) for determining a time interval including a whole number of said pulses, and means (24) for counting the whole number of said pulses during said time interval. Said device comprises means (24) for determining a quantity representing the radius of the wheel and means (24) for determining said quantity based on the whole number of pulses, on the time interval and on the quantity representing the radius of the wheel.

Abstract: The invention concerns a system for determining inflating pressure of tires mounted on a motor vehicle front and rear wheels. Said system comprises means (12, 14) for acquiring inflating pressures of the front and rear wheels, means (16, 18) for acquiring vertical accelerations of the front and rear wheels, and means (32) for emerging the acquired pressures and the acquired accelerations to estimate the inflating pressures of the front and rear tires.

Abstract: The invention concerns a system for determining inflating pressures of tires mounted on a motor vehicle wheels, this system comprising means (12, 13) for acquiring vertical accelerations of a front wheel and of a rear wheel of the vehicle and means (34) for estimating coefficients of stiffness of the tires of said wheels based on the acquired accelerations on another of the acquired accelerations, and in that the estimation means (34) are adapted to estimate these coefficients of stiffness based on the thus temporally reset accelerations.

Abstract: A method for evaluating instantaneous frequency of a mechanical excitation exerted on a motor vehicle wheel by the uneven surface of a road, based on measurements of observable parameters such as those related to the instantaneous height of the chassis and/or the wheel of the vehicle. The method includes a filtering procedure producing successive estimates of the instantaneous height of the chassis and of the wheel, a lag extracting procedure, producing an estimated value of the time lag between the height estimations, and a frequency estimating procedure, producing the desired evaluation of the frequency based on the estimated time lag value.

Abstract: A method for evaluating instantaneous frequency of a mechanical excitation exerted on a motor vehicle wheel by the uneven surface of a road, based on measurements of observable parameters such as those related to the instantaneous height of the chassis and/or the wheel of the vehicle. The method includes a filtering procedure producing successive estimates of the instantaneous height of the chassis and of the wheel, a lag extracting procedure, producing an estimated value of the time lag between the height estimations, and a frequency estimating procedure, producing the desired evaluation of the frequency based on the estimated time lag value.