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 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 motor vehicle (10) comprising a system (52) for controlling the handling thereof and a system (50) for diagnosing the condition of its tyres. Said control system (52) is adapted to control the vehicle handling based on the diagnosed state of the tyres.