A road condition monitoring system for a vehicle is provided. The vehicle is supported by at least one tire and includes a central communication system. The system includes a processor in electronic communication with the central communication system. An identifier is in electronic communication with the processor, receives vehicle condition data from the central communication system, and identifies a free rolling instance of the at least one tire. A slip estimator is in electronic communication with the processor, receives speed data from the central communication system, and determines slip characteristics of the at least one tire during the free rolling instance. A classifier is in electronic communication with the processor, receives the slip characteristics of the at least one tire, and identifies a road surface condition from the slip characteristics.

A collision avoidance support device for a vehicle that includes an obstacle detection device for detecting an obstacle in front of the vehicle and an electronic control unit configured to perform automatic brake control that automatically applies braking force to a vehicle when it is determined that the obstacle detection device have detected an obstacle and the vehicle may collide with the obstacle, and the electronic control unit is configured to prohibit the automatic brake control when the vehicle is towing a trailer and a friction coefficient of a road surface is determined to be lower than a standard value.

A system for determining a wheel-rail adhesion value for a railway vehicle including at least one axle to which two wheels having a radius are coupled is provided. The system includes a deformation detection circuit coupled to an axle arranged to detect a torsional deformation of the axle due to a longitudinal adhesion force transferred from the axle to the rail, and a controller arranged to estimate a torque value as a function of the torsional deformation detected to convert the estimated torque value into the longitudinal adhesion force value as a function of the radius of the wheels, and to calculate the wheel-rail adhesion value through the ratio between the longitudinal adhesion force value and a normal load value that the axle exerts on the rail. A method for determining a wheel-rail adhesion value for a railway vehicle is also provided.

Systems and methods are provided for generating data indicative of a friction associated with a driving surface, and for using the friction data in association with one or more vehicles. In one example, a computing system can detect a stop associated with a vehicle and initiate a steering action of the vehicle during the stop. The steering action is associated with movement of at least one tire of the vehicle relative to a driving surface. The computing system can obtain operational data associated with the steering action during the stop of the vehicle. The computing system can determine a friction associated with the driving surface based at least in part on the operational data associated with the steering action. The computing system can generate data indicative of the friction associated with the driving surface.

A braking method for a vehicle is provided. The method includes the following steps: obtaining a first state information of the vehicle, where the first state information includes a vehicle mass and a deceleration required by braking; calculating a braking torque required by the vehicle according to the first state information, and controlling an output of an electric braking torque according to the braking torque required by the vehicle; obtaining a current vehicle speed of the vehicle and a maximum electric braking exit speed; and; controlling, if the deceleration required by braking of the vehicle changes to zero, the vehicle to unload the electric braking torque when the current vehicle speed is less than the maximum electric braking exit speed. A braking device for a vehicle and a vehicle are further provided.

A braking capacity decrease determining device including a brake ECU is applied to a vehicle including wheel speed sensors and a brake device. The brake ECU performs a first determination process of determining whether a temporary braking decrease determination condition is satisfied for each of a plurality of wheels provided on the vehicle. The brake ECU additionally performs a second determination process of determining whether there are both a wheel for which the temporary braking decrease determination condition is satisfied and a wheel for which the temporary braking decrease determination condition is not satisfied out of the plurality of wheels and determining that a braking capacity of the brake device has decreased when it is determined that there are both a wheel for which the temporary braking decrease determination condition is satisfied and a wheel for which the temporary braking decrease determination condition is not satisfied.

Guide systems for installing aircraft structures are disclosed. An example apparatus includes a first guide system structured to removably couple to a first aircraft structure having a first hinge component. A second guide system is structured to removably couple to a second aircraft structure having a second hinge component. The first guide system is to engage the second guide system to enable alignment between the first hinge component and the second hinge component during assembly of the first aircraft structure and the second aircraft structure.

The present disclosure provides a vehicle brake comprising: a reservoir configured to store a fluid therein; a hydraulic circuit configured to transfer a hydraulic pressure to a wheel of a vehicle; a plurality of valves disposed to regulate a flow of the fluid in the hydraulic circuit; and a master cylinder including a cylinder body, a main piston which is movably disposed within the cylinder body and in which a receptacle is formed at one side thereof, and a center piston which is disposed within the cylinder body and in which a penetration hole is formed in at least a part thereof, wherein the penetration hole is formed to have a size smaller than a cross-sectional area of the receptacle, and as the main piston moves, at least a part of the center piston is inserted into the receptacle, and thus a pressurizing area of the main piston decreases.

A system and method of mu estimation may include the steps of collecting vehicle travel data on a road surface via a plurality of a sensors including at least one of an accelerometer or microphone; collecting external source data over a network; and aggregating the vehicle travel data and external source data to form an aggregated data set. The method may include performing feature extraction processing of the aggregated data set to transform the aggregated data set and into a processed aggregated data set; communicating the processed aggregated data set to a machine learning model; and generating at least one of an estimated mu value of the road surface or road surface classification via the machine learning model.

A road surface state determination apparatus includes a plurality of tire-side devices each of which detects vibration applied to corresponding tire and produces road surface data indicative of a road surface state based on data of the vibration, and a vehicle-body-side system that determines the road surface state based on the road surface data.