Described herein are systems and methods for determination of rolling resistance from a sensor or sensors in a tire or tires for application in smart cars to provide feedback to interested parties, such as Departments of Transportation or tire manufacturers.

Disclosed in this invention is a flat-belt type VTEHIL test bench for commercial vehicles, including a main bench body and a bench test system. The main bench body is mounted inside a foundation and includes a main bench frame, a bench cover, front axle flat-belt assemblies and rear axle flat-belt assemblies. Each front axle flat-belt assembly is provided therein with a fixed plate, a rotary disc and a limiting mechanism. Each rear axle flat-belt assembly includes a flat belt and flat belt pulleys disposed both within the flat belt at opposing ends thereof. The foundation defines a sector-shaped mounting depression in which the main bench body is mounted, and an iron floor is arranged under the main bench body. This invention can better simulate actual driving surfaces and accommodate two-axle, three-axle, four-axle and other types of trucks or tractors. The test bench is able to test unmanned driving capabilities of intelligent commercial vehicles by allowing them to take lane changing, turning, braking and other driving actions in simulated setups and providing them with various traffic scenarios created with simulated traffic participants.

Described herein are systems and methods for determination of rolling resistance from a sensor or sensors in a tire or tires for application in smart cars to provide feedback to interested parties, such as Departments of Transportation or tire manufacturers.

A load determining system having a sensorized rolling element bearing in a hub unit for wheels. The bearing includes a first ring and a second ring as an inner and outer ring. The first and second ring may be the inner ring, the other ring being the outer ring. The system includes at least two magnetic sensors attached to the first ring interact with a target wheel attached to the second ring. The system includes a signal processing unit configured to receive the magnetic sensor output of the at least one magnetic sensor, to determine at least axial forces acting on the bearing based on the amplitude of the magnetic sensor output and to calculate averages value of the outputs of the at least two magnetic sensors and to calculate a logarithm of a ratio of the average values to determine a load acting on the bearing.

A tire ground contact characteristic measuring method according to the present invention includes: a reproduction step of reproducing a transient change in a tire attitude that occurs during travel of an actual vehicle on a tire; a stress measurement step of causing stress measuring portion embedded on a rotatable rotary drum to measure stress that is applied to the tire in contact with the rotary drum that is rotationally driven; and a calculation step of calculating tire ground contact characteristics, which are characteristics of a ground contact region of a tread surface of the tire in contact with the rotary drum on the basis of the stress measured by the stress measuring portion. The tire ground contact characteristics calculated in the calculation step are tire ground contact characteristics of the tire corresponding to the tire attitude of the actual vehicle at each point in time during a period where the transient change occurs.

Disclosed in this invention is a flat-belt type VTEHIL test bench for commercial vehicles, including a main bench body and a bench test system. The main bench body is mounted inside a foundation and includes a main bench frame, a bench cover, front axle flat-belt assemblies and rear axle flat-belt assemblies. Each front axle flat-belt assembly is provided therein with a fixed plate, a rotary disc and a limiting mechanism. Each rear axle flat-belt assembly includes a flat belt and flat belt pulleys disposed both within the flat belt at opposing ends thereof. The foundation defines a sector-shaped mounting depression in which the main bench body is mounted, and an iron floor is arranged under the main bench body. This invention can better simulate actual driving surfaces and accommodate two-axle, three-axle, four-axle and other types of trucks or tractors. The test bench is able to test unmanned driving capabilities of intelligent commercial vehicles by allowing them to take lane changing, turning, braking and other driving actions in simulated setups and providing them with various traffic scenarios created with simulated traffic participants.

A whole vehicle in-loop test system of an intelligent automobile, including: a rotary drum platform, used for simulating a longitudinal movement of a test vehicle; an environment perception platform, disposed at a front end of the rotary drum platform, used for simulating a transverse movement of a test vehicle, and including a support base at a lower portion and a vehicle placing platform at an upper portion, where a transverse drive wheel is mounted at the lower portion of the support base, and the transverse drive wheel moves along a transverse track disposed on the ground; and a target vehicle simulation unit, disposed at a periphery of the environment perception platform, and configured to simulate a target vehicle.

In a vehicle action simulation method according to the present invention, a behavior of an actual vehicle during travel is predicted, and an attitude of a tire and a rotational speed of a rotary drum are changed to reproduce a transient change in a tire attitude that occurs during the travel of the actual vehicle on the tire while the predicted behavior of the actual vehicle during travel is reflected, stress applied to the tire in contact with the rotary drum of a tire ground contact characteristic measuring portion is measured, tire ground contact characteristics are calculated, the behavior of the actual vehicle during travel is predicted while vehicle characteristics predicted from the tire ground contact characteristics are reflected, and the prediction, the reproduction, the measurement of stress, and the calculation are performed in parallel.

A processor, responsive to a set of location or motion data describing one or more objects relative to a first, local frame of reference, generates a transformed set of location or motion data describing the one or more objects relative to a second, local frame of reference different than the first local frame of reference, such that the set of location or motion data and the transformed set of location or motion data relative to a global frame of reference are same. The processor also outputs the transformed set of location or motion data to a vehicle such that the vehicle performs control operations responsive thereto.

The present invention relates to a method of positioning at least one wheel support of a vehicle dynamometer in relation to the position of a wheel in the longitudinal direction of a vehicle standing on the vehicle dynamometer. The wheel support is positioned using a drive unit for adjusting the position of the wheel support. The positioning takes place with a vehicle located on the vehicle dynamometer, wherein the vehicle is held in place during the positioning at least in relation to its longitudinal direction. The positioning of the wheel support takes place as a function of a variable that represents a three to be applied by the drive unit and/or a torque to be applied by the drive unit and/or the power consumption of the drive unit and/or the work done by the drive unit when the wheel support is moved along a defined distance when a specific movement profile of the wheel support is achieved during movement in a direction corresponding to the longitudinal direction of a vehicle standing on the vehicle dynamometer.