A tire radius monitoring system for dynamically determining a tire effective radius for each of the wheels on a vehicle is described. The system includes a GPS sensor, a plurality of wheel speed sensors, and a controller. The controller determines, via the GPS sensor, a velocity vector related to longitudinal velocity of the vehicle. The controller determines wheel speeds for the plurality of vehicle wheels, and detects a no-wheel-slip state for the vehicle wheels and the velocity vector from the GPS sensor. The controller determines tire effective radii for the plurality of vehicle wheels based upon the velocity vector for the vehicle and the wheel speeds for the plurality of vehicle wheels during the no-wheel-slip state, and controls vehicle operation based upon the tire effective radii.

A method for determining a wheel radius of a motor vehicle, including calculating a yaw rate of the motor vehicle by means of a wheel speed of at least one wheel and a predefined wheel radius. The calculated yaw rate is compared with a measured yaw rate. The wheel speed is adapted. The calculation of the yaw rate is input, of the at least one wheel by means of a correction factor, so that the calculated yaw rate is equal to the measured yaw rate. The correction factor and the predefined wheel radius or the wheel speed is multiplied. The calculation of the yaw rate is input, for the determination of a corrected wheel radius or of a corrected wheel speed.

A tire radius monitoring system for dynamically determining a tire effective radius for each of the wheels on a vehicle is described. The system includes a GPS sensor, a plurality of wheel speed sensors, and a controller. The controller determines, via the GPS sensor, a velocity vector related to longitudinal velocity of the vehicle. The controller determines wheel speeds for the plurality of vehicle wheels, and detects a no-wheel-slip state for the vehicle wheels and the velocity vector from the GPS sensor. The controller determines tire effective radii for the plurality of vehicle wheels based upon the velocity vector for the vehicle and the wheel speeds for the plurality of vehicle wheels during the no-wheel-slip state, and controls vehicle operation based upon the tire effective radii.

A method and a device for ascertaining a dynamic tire circumference of a transportation vehicle. The method includes: receiving a first signal representing a yaw rate of the transportation vehicle, a second signal representing a wheel rotation speed of a wheel of the transportation vehicle, a third signal representing a steering angle of the transportation vehicle, and a fourth signal representing a dynamic track width of the transportation vehicle; ascertaining a first output signal of a first Kalman filter that represents the dynamic tire circumference of the wheel, using the first signal, the second signal, the third signal, and the fourth signal as input signals for the first Kalman filter; and using the first output signal in a control unit of the transportation vehicle.

A method for iteratively determining the radius of a wheel of a number of wheels can be utilized for a motor vehicle having a driving direction sensor unit for detecting straight line travel, with each wheel being assigned an incremental sensor unit for detecting increments embodying wheel rotational movements. The method may involve checking whether the motor vehicle is driving based on the incremental sensor units, checking whether the motor vehicle is driving in a straight line based on the driving direction sensor unit, checking whether each wheel is slide-free and slip-free based on the incremental sensor units, determining the distance driven by each wheel based on the sensor value of the respective incremental sensor unit and the radius to be iteratively determined of the wheel of a previous iteration, determining the distance driven by the motor vehicle based on the distance driven by each wheel, determining the radius to be iteratively determined of the wheel based on the distance traveled by the motor vehicle and the sensor value of the respective incremental sensor unit, verifying that a validation condition is met and then repeating the aforementioned steps.

A method for determining a wheel radius of a motor vehicle, including calculating a yaw rate of the motor vehicle by means of a wheel speed of at least one wheel and a predefined wheel radius. The calculated yaw rate is compared with a measured yaw rate. The wheel speed is adapted. The calculation of the yaw rate is input, of the at least one wheel by means of a correction factor, so that the calculated yaw rate is equal to the measured yaw rate. The correction factor and the predefined wheel radius or the wheel speed is multiplied. The calculation of the yaw rate is input, for the determination of a corrected wheel radius or of a corrected wheel speed.

A rail vehicle braking system includes at least one disk brake associated with a wheel or a wheel set, wherein the disk brake includes at least one brake disk, at least one brake lining which engages with the brake disk, at least one application device exerting an application force on the at least one brake lining during a braking operation, and a control device for controlling the application device, wherein the control device is coupled to a determination unit for determining a current wheel diameter of the wheel or of the wheel set, wherein the control unit is configured such that, when a predetermined application force is actuated during braking operation, a value of the current wheel diameter detected by the determination unit is taken into account.

The present invention relates to an apparatus and a method for monitoring a tire pressure considering a low pressure situation. Provided is a tire pressure monitoring apparatus considering a low pressure situation including: a radius analyzing unit which calculates a radius analysis value using a relative velocity difference and an average velocity calculated from wheel velocities of the wheels mounted on the vehicle; a critical value setting unit which compares the calculated radius analysis value with a predetermined determination reference value and sets different critical values in accordance with the comparison result; and a low pressure determining unit which determines a low pressure of a tire mounted on a vehicle using the set critical value.

A rail vehicle braking system includes at least one disk brake associated with a wheel or a wheel set, wherein the disk brake includes at least one brake disk, at least one brake lining which engages with the brake disk, at least one application device exerting an application force on the at least one brake lining during a braking operation, and a control device for controlling the application device, wherein the control device is coupled to a determination unit for determining a current wheel diameter of the wheel or of the wheel set, wherein the control unit is configured such that, when a predetermined application force is actuated during braking operation, a value of the current wheel diameter detected by the determination unit is taken into account.

A method comprises checking whether a motor vehicle is driving based on the incremental sensor units, checking whether the motor vehicle is driving in a straight line based on a driving direction sensor unit, checking whether each wheel is slide-free and slip-free based on the incremental sensor units, determining the distance driven by each wheel based on the sensor value of the respective incremental sensor unit and the radius to be iteratively determined of the wheel of a previous iteration, determining the distance driven by the motor vehicle based on the distance driven by each wheel, determining the radius to be iteratively determined of the wheel based on the distance traveled by the motor vehicle and the sensor value of the respective incremental sensor unit, verifying that a validation condition is met and then repeating the aforementioned steps.