An overrunable test vehicle including an electronically-controlled anti-slip braking system for reducing wheel slip during rapid deceleration comprising: a chassis, at least one electric motor connected to a first axle, a hydraulic braking system connected with the chassis and at least a second axle, a rotational speed sensor for determining a rotational speed of a connected axle, a ground speed sensor, and a controller connected with the electric motor, the hydraulic braking system, the rotational speed sensor, and the ground speed sensor. The controller is configured to calculate a difference between the rotational speed of the axle and the ground speed of the chassis to determine a slip threshold of the wheels, actuate the hydraulic brake system to apply a first stopping force, control at least one motor parameter of the electric motor to apply a second stopping force. The first and second stopping forces combined are less than the slip threshold of the wheels such that the chassis rapidly decelerates free of a wheel slip condition.

A method for controlling a vehicle brake system of a heavy duty vehicle, the brake system comprising a service brake system and an electrical machine brake system. The method includes determining a total brake torque request for braking a wheel of the vehicle, obtaining a brake torque capability of the electrical machine, determining if the total brake torque request exceeds the brake torque capability of the electrical machine, and if the total brake torque request exceeds the brake torque capability of the electrical machine but is below a threshold level, applying a baseline brake torque by the service brake system, wherein the baseline brake torque is configured to compensate for a difference between total brake torque request and brake torque capability of the electrical machine, and controlling wheel slip by the electrical machine brake system.

A computer implemented method for controlling at least one driven and/or braked wheel of a heavy-duty vehicle. The method includes obtaining a motion request indicative of a desired longitudinal acceleration and/or longitudinal force associated with the vehicle, and configuring a wheel slip limit value indicative of a maximum allowable wheel slip by the at least one driven and/or braked wheel at a nominal value, and increasing the wheel slip limit value from the nominal value to a boost wheel slip value in response to detecting a boost signal, as well as controlling the at least one driven and/or braked wheel in dependence of the motion request and subject to the wheel slip limit value.

An antilock control method for a braking system of a vehicle has at least the following steps: upon the presence of a brake request signal, outputting a brake control signal and building up a brake pressure by a braking medium at a wheel brake of a vehicle wheel, measuring a wheel speed of the vehicle wheel to be braked, and determining a wheel slip of the vehicle wheel, upon meeting a first traction criterion or a locking tendency of the vehicle wheel, activating a wheel drive unit and applying a wheel drive torque on the vehicle wheel to increase the wheel circumferential velocity and to reduce the wheel slip until a second traction criterion is met. The brake force introduced in the wheel brake is controlled as a function of the wheel slip by releasing the brake pressure upon satisfying a first traction criterion.

A braking control device includes a “master cylinder CM capable of pressure feeding brake fluid BF in conjunction with the movement of a brake operating member BP of a vehicle”, an “electrically driven fluid unit HU”, “front wheel and rear wheel cylinders CWf, CWr that are provided on the front wheel and rear wheel WHf, WHr of the vehicle and are pressurized by either one of the master cylinder CM and the fluid unit HU”, and a “controller ECU that controls the fluid unit HU”. The controller ECU determines whether or not external leakage of a brake fluid BF has occurred in the braking control device, and when the external leakage has occurred, pressurizes the front wheel cylinder CWf by the master cylinder CM, and pressurizes the rear wheel cylinder CWr by the fluid unit HU.

A braking control device includes a “master cylinder CM capable of pressure feeding brake fluid BF in conjunction with the movement of a brake operating member BP of a vehicle”, an “electrically driven fluid unit HU”, “front wheel and rear wheel cylinders CWf, CWr that are provided on the front wheel and rear wheel WHf, WHr of the vehicle and are pressurized by either one of the master cylinder CM and the fluid unit HU”, and a “controller ECU that controls the fluid unit HU”. The controller ECU determines whether or not external leakage of a brake fluid BF has occurred in the braking control device, and when the external leakage has occurred, pressurizes the front wheel cylinder CWf by the master cylinder CM, and pressurizes the rear wheel cylinder CWr by the fluid unit HU.

A method for setting a working point of a slip controller for a wheel of a vehicle. Upon activating the slip controller, a torque at the wheel is controlled on the basis of the working point using a slip at the wheel, wherein the torque is monitored and a value of the working point is set to a previous value of the torque if the slip satisfies a condition.

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 an apparatus of controlling a braking of a vehicle traveling in track mode includes a driving information detector configured to detect a braking request from a driver while the vehicle is driving; and a vehicle controller configured to, when the braking request is detected, control the braking of the vehicle according to a total required torque in response to the detected braking request, wherein the total required torque is a sum of a regenerative braking torque by a motor of the vehicle and a friction braking torque by a brake of the vehicle, wherein the vehicle controller is configured to decrease braking force by friction braking by relatively decreasing friction braking torque by increasing the regenerative braking torque of the total required torque, and wherein the regenerative braking torque is greater than a regenerative braking torque in non-track mode.

A method for operating a brake system of a motor vehicle, comprises a hydraulic operational brake device that has hydraulically-actuatable wheel brakes on at least one front axle of the motor vehicle, a parking brake device having wheel brakes on a rear axle of the motor vehicle, each of which can be actuated by means of an electromechanical actuator, and wheel speed sensors on the wheels of said front and rear axles. During braking by means of said hydraulic operational brake device while the vehicle is travelling, braking is carried out by said parking brake device.