The invention relates to an acceleration sensor, especially a duplex acceleration sensor, an arrangement and a method for detecting a loss of road grip of a vehicle wheel (3). The acceleration sensor comprises a tube (5) having a longitudinal axis forming a circular arc segment, and two closed ends. A mass (15; 315) is arranged inside the tube (5) such that is able to move inside the tube (5) in the longitudinal direction thereof. A magnet arrangement (17; 203; 205; 317) is designed to counteract, by way of a magnetic force exerted on the mass (15; 315), a movement of said mass (15; 315) from an idle position (25), and a read-out unit (608) is designed to detect a movement of said mass (15) from the idle position (25).

Starting from an acceleration signal, representative of a radial acceleration undergone by a portion of a crown region of said tyre due to the rolling of said tyre on a rolling surface, the trend of the first derivative of the radial acceleration is determined at a portion representative of the interaction of the tyre with a water layer. From the trend of the first derivative of the radial acceleration, it is determined at least one first parameter representative of an aquaplane condition of the tyre on the basis of a comparison between a first maximum and a second maximum of the first derivative at the portion representative of the interaction between tyre and water layer.

A road condition is classified based on spray water occurring at a wheel of the vehicle. To this end, the space around a wheel of the vehicle is imaged by a camera and the image captured by the camera is analyzed to detect spray water therein. A distinction can be made between a dry road, a wet road or a road having a risk of aquaplaning on the basis of the detected spray water, e.g. based on the angle, direction or projection range of the spray water.

A method for detecting a road condition in the area of a vehicle using sensor data from an acoustic sensor system of the vehicle. A detection rate of false positive objects reproduced in the sensor data is analyzed in an analysis step in order to detect a current road condition, a current value of the detection rate being analyzed using at least one expected value assigned to a road condition.

A regenerative braking control method of a vehicle, may include a first operation of determining a driving risk of a road surface on the basis of a status of the road surface while driving; a second operation of determining whether an accelerator pedal is released while driving; a third operation of determining whether a brake pedal is operated while driving; and a fourth operation of performing no regenerative braking when the accelerator pedal is determined as being released, the driving risk of the road surface is determined as being high, and when the brake pedal is determined as not being operated.

The invention relates to a sensor assembly for recognizing a state of a roadway, including a sensor device, which is adapted to capture an impact of water on a wheel arch lining of a motor vehicle during a travel of the motor vehicle on the roadway, and including a control device for recognizing the state of the roadway based on the impact of the water captured by means of the sensor device, wherein the sensor device includes an ultrasonic sensor, which is adapted to receive an ultrasonic signal and which is additionally adapted to capture the impact of the water on the wheel arch lining.

A sound measurement system intended to be installed on a motor vehicle, the system comprising: a microphone, an element for supporting the microphone, mechanical means for protecting the microphone against various projections (water, dust, etc.) from the environment of the vehicle, and mechanical means for protecting the microphone from airborne noise originating from the routing of the sound wave between the source and the measurement (cavity noise) and from the environment of the measuring system (turbulence around the measuring device), the various mechanical protection means being separate or combined. A motor vehicle may be provided with such a system.

The invention provides a hydroplaning detection method and system. Hydroplaning of a tire is detected based on radial acceleration data of a tire. The radial acceleration data is obtained by using a tire-mounted sensor unit. The lightweight implementation of the method and system allows for quick and robust detection of hydroplaning at an early stage, thereby improving the overall security of a vehicle equipped with the system.

A hydroplaning determination device that determines occurrence of a hydroplaning phenomenon in a vehicle includes a tire mount sensor including a vibration detection unit, a signal process unit and a transmission unit, and a vehicle body system including a receiver, a condition determination unit and a hydroplaning determination unit. The vibration detection unit is attached to a rear surface of a tire provided in a vehicle and outputs a detection signal according to a magnitude of vibration of the tire. The signal process unit generates a vibration data based on the detection signal. The hydroplaning determination unit determines, based on the vibration data, whether a hydroplaning phenomenon has occurred when the condition determination unit determines that a road surface condition is a wet condition in which a water film exists between the tire and a road surface.

A system for preventing aquaplaning in a vehicle, said system comprising: a tank suitable for containing a fluid; sensor means configured to reveal the conditions of the vehicle and/or the environment in which the vehicle is found, and in particular, the conditions of a street surface; injector means configured to generate a jet of fluid on said street surface, said injector means being associated with at least one wheel of the vehicle; a control unit associated with sensor means and configured for controlling said injector means according to the conditions revealed by said sensor means. A unique feature of the system of the present invention consists in the fact that said injector means comprise at least one fan-type nozzle and equipped with a slit-shaped outlet opening suitable for creating a flat jet of fluid.