An electrohydraulic brake system of an off-road vehicle includes a first hydraulic brake circuit for a first vehicle axle; a second hydraulic brake circuit for at least one second vehicle axle; a respective wheel brake for each vehicle wheel per vehicle axle; an electronic control unit having a brake force distribution function; a brake signal generator; at least one central brake force distribution valve per brake circuit, a signal input of the control unit for registering a braking signal of the brake signal generator; and at least one signal output of the control unit per brake force distribution valve. A brake pressure for applying a hydraulic pressure fluid to the brake cylinders of the wheel brakes on the respective vehicle axles can be fed to the respective brake circuit by the control unit in conjunction with the central brake force distribution valve and the brake signal generator.

A parking brake apparatus is provided for an autonomously drivable vehicle having components of a parking brake system for applying a parking brake. The parking brake apparatus comprises a first controller arranged to provide one or more control signals to be applied to components of the parking brake system to apply the parking brake in response to a signal requesting the parking brake to be applied. The parking brake apparatus also comprises a second controller arranged to provide one or more control signals to be applied to other components of the parking brake system to apply the parking brake in response to unavailability of the first controller to cause the parking brake to be applied.

A method for adjusting brake pressures on pneumatically operated wheel brakes of a motor vehicle includes adjusting, in a normal braking mode, the brake pressures depending on a driver brake request; and adjusting, by a control unit in a pressure control mode, the brake pressures at the respective wheel brakes during reception of an external brake request, which is independent of the driver brake request and defined for the control unit as an external target deceleration value, as a function of a resulting target deceleration value of the vehicle deceleration. The control unit determines the resulting target deceleration value by linking the external target deceleration value according to the external brake request and a value corresponding to the driver brake request. A braking power index is determined which quantitatively represents the braking effect of the wheel brakes, and is provided to be taken into account in pressure control mode.

A method for regulating a vehicle-actual-deceleration in a vehicle with an ABS brake system includes detecting the vehicle-actual-deceleration; determining a target vehicle deceleration and detecting at least one actual wheel rotational behavior. The method further includes calculating actuation times for actuation of pressure control valves of the ABS brake system associated with the wheels of the first vehicle axle and the wheels of the further vehicle axle and determining correction actuation times if at least one of the respective calculated actuation times is less than a minimum actuation time associated with the respective pressure control valve. Calculation of each of the respective actuation times is carried out at least for all of a first number of pressure control valves with which wheels are associated whose rotational behavior follows the at least one actual wheel rotational behavior.

A fluid brake system permitting a vehicle to remain in a stopped condition indefinitely includes a first fluid circuit by which fluid pressure is applicable to brake chambers of a first set of vehicle wheels, as well as a second fluid circuit by which fluid pressure is applicable to brake chambers of a second set of vehicle wheels. An electronic control unit or other such control device serves to repeatedly alternate fluid pressure application to the brake chambers of the first set of vehicle wheels, without fluid pressure application to the brake chambers of the second set of vehicle wheels, and fluid pressure application to the brake chambers of the second set of vehicle wheels, without fluid pressure application to the brake chambers of the first set of vehicle wheels.

A method for adjusting brake pressures on pneumatically operated wheel brakes of a motor vehicle includes adjusting, in a normal braking mode, the brake pressures depending on a driver brake request; and adjusting, by a control unit in a pressure control mode, the brake pressures at the respective wheel brakes during reception of an external brake request, which is independent of the driver brake request and defined for the control unit as an external target deceleration value, as a function of a resulting target deceleration value of the vehicle deceleration. The control unit determines the resulting target deceleration value by linking the external target deceleration value according to the external brake request and a value corresponding to the driver brake request. A braking power index is determined which quantitatively represents the braking effect of the wheel brakes, and is provided to be taken into account in pressure control mode.

A method is provided for controlling a pressure control device of a pressure-medium brake system of a vehicle which individually controls brake pressures in brake cylinders of wheels of an axle. The pressure control device includes a relay valve. In order to compensate for response sluggishness of the relay valve, shut-off valves connected between the relay valve and their respective brake cylinders are not switched into a passage position in which pressure is forwarded to the brake cylinders until a permissible pressure gradient exists between the working pressures of the relay valve and the brake pressures in the brake cylinders.

A control device for controlling a brake system of a vehicle comprises a first output for controlling a first solenoid valve; a second output for controlling a valve device; an input for receiving a requested brake pressure; and a port for receiving messages on a databus. The control device is capable of receiving an automatic brake request on the databus; determining a desired brake pressure in response to the automatic brake request; receiving a requested brake pressure in response to a driver actuating a service brake valve; comparing the desired brake pressure to the requested brake pressure; transmitting a control signal to close the first solenoid valve and transmitting a control signal to change the valve device to a first operating position in response to the requested brake pressure being less than the desired brake pressure in order to provide pressure to at least one brake actuator.

A control device for controlling a brake system of a vehicle comprises a first output for controlling a first solenoid valve; a second output for controlling a valve device; an input for receiving a requested brake pressure; and a port for receiving messages on a databus. The control device is capable of receiving an automatic brake request on the databus; determining a desired brake pressure in response to the automatic brake request; receiving a requested brake pressure in response to a driver actuating a service brake valve; comparing the desired brake pressure to the requested brake pressure; transmitting a control signal to close the first solenoid valve and transmitting a control signal to change the valve device to a first operating position in response to the requested brake pressure being less than the desired brake pressure in order to provide pressure to at least one brake actuator.

A brake system for a motor vehicle, particularly a commercial vehicle, includes at least one electronic control unit, at least one parking brake device, and at least one wheel-blocking detection device. The wheel-blocking detection device is configured to: detect at least one blocking condition of one or more wheels of the motor vehicle, generate at least one blocking condition signal in response to the detected blocking condition, and transmit the blocking condition signal to the electronic control unit. The electronic control unit is configured to control the parking brake device such that, in a moving condition of the motor vehicle, at least one gradual actuation of the parking brake device is reduced or stopped if the blocking condition signal is generated.