A brake system, method for controlling the brake system and a mine vehicle having the same are provided. The brake system of the mine vehicle includes spring activated and hydraulically released brake assemblies in connection with wheels of the vehicle. The brake assemblies have hydraulic release actuators, which are pressurized for releasing the brakes. During normal operation, the release actuators are pressurized by a main brake circuit and are controlled by a brake controller. A separate release circuit and pressure source may be activated for releasing the brakes when the vehicle is disabled. The system further includes an override device for selectively depressurizing the release actuators during towing.

A motor vehicle includes at least one hydraulically actuatable wheel braking device and at least one electric drive motor. A method for operating the vehicle includes monitoring a driver behavior upon an emergency braking operation, and activating the hydraulic wheel braking device for generating a hydraulic emergency braking torque when an emergency braking operation is detected. When the emergency braking torque is detected, the drive motor is also operated as a generator in order to generate an additional electrical emergency braking torque.

A control valve for applying a spring-loaded brake pressure to spring-loaded parts of a rear-axle wheel brake is pneumatically activated as a function of a parking-brake braking demand and a service-brake braking demand. A first control chamber is connected via a first control piston to a control arrangement in the control valve. During an adjustment of the first control chamber via the service-brake control pressure, the spring-loaded brake pressure at the working output is a function of the service-brake control pressure or of the parking-brake control pressure. The first control piston is connected to a third control chamber, wherein the pressure in the first control chamber acts on the first control piston in one direction, and the pressure in the third control chamber acts on the first control piston in the opposite direction. The first control chamber is selectively connectable to the third control chamber via a switchable bypass valve.

A control valve for applying a spring-loaded brake pressure to spring-loaded parts of a rear-axle wheel brake is pneumatically activated as a function of a parking-brake braking demand and a service-brake braking demand. A first control chamber is connected via a first control piston to a control arrangement in the control valve. During an adjustment of the first control chamber via the service-brake control pressure, the spring-loaded brake pressure at the working output is a function of the service-brake control pressure or of the parking-brake control pressure. The first control piston is connected to a third control chamber, wherein the pressure in the first control chamber acts on the first control piston in one direction, and the pressure in the third control chamber acts on the first control piston in the opposite direction. The first control chamber is selectively connectable to the third control chamber via a switchable bypass valve.

A vehicle spring brake having a parking brake housing that defines a parking brake chamber and a service brake housing that defines a service brake chamber. A flexible membrane separates the parking brake chamber from the service brake chamber and flexes into and out of the service brake chamber based upon a pressure differential between an air pressure in the parking brake chamber and an air pressure in the service brake chamber. A pushrod extends out of the service brake housing when the flexible membrane flexes into the service brake chamber and retracts into the service brake housing when the flexible membrane flexes back out of the service brake chamber. A control valve controls the pressure differential to thereby control movement of the flexible membrane and the pushrod.

A hydraulic brake system for a motor vehicle with redundant braking pressure regulation is presented. The brake system comprises a first functional unit having at least one first electrical braking pressure generator which is designed to generate a braking pressure at each of a plurality of wheel brakes, and further having a valve assembly per wheel brake. The valve assembly can be actuated for braking pressure regulation at the corresponding wheel brake in order to couple a first wheel brake associated with the valve assembly either to the first braking pressure generator or to an unpressurized reservoir for hydraulic fluid. The brake system also comprises a second functional unit having at least one second electrical braking pressure generator which is designed to generate a braking pressure at each of a subset of the wheel brakes. The output of the second braking pressure generator is arranged downstream, as seen from the first braking pressure generator, of the valve assembly associated with the corresponding wheel brake. The second functional unit is also designed to perform braking pressure regulation at each wheel brake of the subset redundantly in relation to the first functional unit.

A brake motor control device for control of an electric brake motor of an electromechanical braking device includes a connection unit configured to be connected to an auxiliary control unit for controlling the electric brake motor in an event of a fault of the brake motor control device. The electric brake motor is configured to displace a brake piston against a brake disc.

The present invention relates to an electronic parking brake device for a vehicle, in particular a utility vehicle. As a function of at least one operating state of a towing vehicle parking brake supply line and/or a trailer parking brake supply line, a towing vehicle parking brake control valve is activatable by a control unit in such a way that a towing vehicle parking brake supply line can be deaerated or aerated by the towing vehicle parking brake control valve. By manually actuating a trailer parking brake control element, a trailer parking brake control valve is activatable by the control unit in such a way that a trailer parking brake supply line can be deaerated or aerated by the trailer parking brake control valve. The present invention also relates to a method for operating the above electronic parking brake device for a vehicle.

A method is disclosed for validating operation of a secondary braking system (SBS) of a vehicle having a plurality of brakes, by controlling the SBS and a primary braking system (PBS) of the vehicle. The method may involve using the PBS to generate a first predetermined target braking pressure in the PBS for at least a first one of the brakes, while using the SBS to generate a second predetermined target braking pressure in the SBS for at least a second one of the brakes. Actual and anticipated performance characteristics of a braking component associated with the vehicle are then observed and compared, and from the comparison a determination is made whether the SBS is operating properly.

A valve system includes an isolation check valve delivering pneumatic fluid as a supply pressure, a double-check valve adapted to deliver a braking demand control signal of the pneumatic fluid based on a higher of a first braking demand in a first pneumatic braking circuit and a second braking demand in a second pneumatic braking circuit, and a control module. The control module is adapted to receive the supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid based on the braking demand control signal, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure. A tractor protection module delivers the pneumatic fluid at the control module delivery pressure based on a trailer park brake pressure of the pneumatic fluid.