A computer that includes a processor and memory that stores instructions executable by the processor. The instructions may include generating, at a host vehicle, a roadway friction map by: detecting a velocity change of a target vehicle; calculating friction data based on the velocity change; and storing the friction data.

A brake fluid pressure control device for a vehicle that can perform fluid pressure control on the brake fluid pressure applied to wheel brakes. It is determined whether the pressure increasing time in the current pressure increasing control exceeds determination time which is set on the basis of the pressure increasing time in past pressure increasing control. If the pressure increasing time in the current pressure increasing control exceeds the determination time, it is determined that the road surface on which the vehicle is travelling has changed from the road surface with a low coefficient of friction to the road surface with a high coefficient of friction.

Systems and methods are disclosed herein for controlling aircraft brakes. A brake control system may comprise a controller, and a tangible, non-transitory memory configured to communicate with the controller. The tangible, non-transitory memory having instructions stored thereon that, in response to execution by the controller, cause the controller to perform operations comprising: determining a braking power discrepancy of a wheel (e.sub.P,i), comparing the braking power discrepancy of the wheel (e.sub.P,i) to a threshold discrepancy value, and modulating a braking pressure applied to the wheel based on the comparison of the braking power discrepancy of the wheel (e.sub.P,i) to the threshold discrepancy value.

The vehicle control apparatus and the control method thereof include an electronic control unit configured to receive wheel slip values sensed by a sensing apparatus, receive the wheel slip values and calculate a predicted wheel slip value using slip prediction model information on the basis of a previous wheel slip value and a current wheel slip value among the wheel slip values. Whether a current state is a first state of which a vehicle moved from a high friction road to a low friction road on the basis of the calculated predicted wheel slip value is then determined. The calculated predicted wheel slip value is compared with predicted target slip value ranges when the current state is determined as being the first state. Whether to control an electric parking brake (EPB) apparatus is determined. A controller configured to transmit a command based on the determination by the ECU.

A method for controlling a hydraulic brake system for a motor vehicle to carry out a braking operation by means of at least one wheel brake includes, in a first step, a pressure buildup in the wheel brake, wherein hydraulic fluid is passed to a wheel brake via a normally open inlet valve. In a second step, a pressure reduction takes place in the wheel brake, wherein hydraulic fluid is discharged from the wheel brake via an energized normally closed outlet valve. The pressure reduction at the wheel brake is accomplished by means of control of the outlet valve in a predefined manner.

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 system and method for controlling wheel brakes on a trailer in a tractor-trailer are provided. Upon receiving a command to apply a trailer wheel brake, the system determines a speed of the tractor-trailer responsive to a speed signal generated by a vehicle speed sensor. The system also estimates a threshold speed based on a level of friction between the tractor-trailer and a road surface on which the tractor-trailer is travelling. The system then generates a control signal to control delivery of fluid pressure to the trailer wheel brake. The control signal causes delivery of a first fluid pressure to the trailer wheel brake when the speed meets a predetermined condition relative to the threshold speed and a second fluid pressure, less than the first fluid pressure, when the speed does not meet the predetermined condition.

A brake device includes a second setting unit that sets a target wheel deceleration of at least one of the wheels to which a target wheel brake force; detection units that detect the actual wheel deceleration of the wheel to which the target wheel deceleration; a first calculation unit that calculates a vehicle deceleration difference which is the difference between the target vehicle deceleration and the actual vehicle deceleration; a second calculation unit which calculates a wheel deceleration difference which is the difference between the target wheel deceleration and the actual wheel deceleration; and a correction unit which corrects, on the basis of the vehicle deceleration difference and the wheel deceleration difference, the target wheel brake force corresponding to at least one of the wheels to which the target wheel brake force is set so that the vehicle deceleration difference becomes smaller.

Systems, methods, and computer-readable storage media for using neural networks to ensure the braking capabilities of articulated vehicles are adapted to prevent jackknifing. A system can receive operational parameters associated with both a vehicle and a trailer being towed by the vehicle. The system can also identify a current surface condition and predict, using a neural network, road conditions for a portion of the road which the vehicle is approaching. When distinctions between current and predicted, future conditions are defined, and the system can cause modification of the operational parameters of the vehicle and/or the trailer.

A braking apparatus of a vehicle and a method of controlling the same are provided. The method of controlling the braking apparatus of a vehicle includes determining whether a brake request signal is input; determining whether an amount of change in the brake request signal is equal to or greater than a preset standard; comparing a slip ratio of a front wheel portion with a slip ratio of a rear wheel portion in response to a determination that the amount of change in the brake request signal is equal to or less than the preset standard; reducing a braking force of a shaft having a large slip ratio of the front wheel portion and the rear wheel portion and increasing a braking force of a shaft having a small slip ratio, based on a comparison result after the comparing of the slip ratio of the front wheel portion with the slip ratio of the rear wheel portion; moving a braking distribution ratio formed based on the increased or reduced braking forces of the front wheel portion and the rear wheel portion from an actual braking curve to an ideal braking curve, after the reducing of the braking force of the shaft having a large slip ratio of the front wheel portion and the rear wheel portion and the increasing of the braking force of the shaft having a small slip ratio; and braking the vehicle based on the braking distribution ratio on the actual braking curve or the moved braking distribution ratio on the ideal braking curve.