A method for adjusting brake pressures at pneumatically actuated wheel brakes of a vehicle includes, after an external braking demand, continuously ascertaining, by a brake control unit, in a pressure control mode, at least one differential slip value from measuring signals supplied by speed sensors of the wheels, as the difference between the slip of two axles of the vehicle before releasing the control signals; evaluating the differential slip value with consideration for a predefined or adjustable setpoint differential slip value; and depending on the evaluation, bringing the differential slip value closer to the setpoint differential slip value by adapting at least one control signal.

A valve module is provided for enabling a vehicle to control an autonomous event of the vehicle. The valve module comprises a relay valve, a first solenoid valve, and a second solenoid valve. A first control pressure can be delivered through the first solenoid valve and applied to a control port of the relay valve. In one embodiment, a second control pressure can be delivered through the second solenoid valve and combined with the first control pressure. The combined first and second control pressures are applied to the control port of the relay valve. In another embodiment, a second control pressure can be delivered through the second solenoid valve only when no first control pressure is delivered through the first solenoid valve.

An electro-pneumatic tractor protection valve assembly (8) including a trailer supply input (84) for receiving a supply pressure, a trailer service output (87) for delivering a trailer supply pressure, a first supply input (81) for receiving a primary driver brake pressure, a second supply input (82) for receiving a secondary driver brake pressure, a dual brake valve (14) actuated by a brake pedal (10) and supplying the brake control pressures, a vent opening (86) for venting an internal conduit, a first electrically controlled pneumatic valve (92) to receive a first electric control signal for trailer assistance braking, and a trailer control output (85) for delivering a trailer brake control pressure. The valve assembly includes one single casing (8a) accommodating the first supply input (81), the second supply input (82), the trailer supply input (84), the trailer control output (85), the vent opening (86) and the trailer service output (87).

A valve includes at least one of an electrical port adapted to receive an electronic control signal and a pneumatic control port adapted to receive a pneumatic control signal. The valve also includes a pneumatic delivery port. The pneumatic delivery port is adapted to transmit a pneumatic fluid, based on the at least one of the received electronic control signal and the received pneumatic control signal, from a second independent source to control i) a second associated service brake and ii) delivery of the pneumatic fluid from a first independent source to control a first associated service brake.

A method for adjusting brake pressures on pneumatically actuated wheel brakes of a vehicle includes, in a normal braking mode, continuously determining, by the brake control unit, at least one differential slip value as a difference between slip values of two wheels or axles of the vehicle, and determining, by the brake control unit, an interaxle braking distribution index for a relevant pair of axles by an assessment of a change in the at least one differential slip value within an evaluation interval. The method further includes, in a pressure control mode, using, by the brake control unit, the interaxle braking distribution index that is determined in the normal braking mode for the weighting of the control signals for the respective pair of axles.

A brake pressure modulator (1) of an electronic braking system of a utility vehicle includes pressure control circuits (13, 14) respectively associated with a braking circuit of a vehicle axle, each pressure control circuit (13, 14) comprises a compressed air supply system (4, 5), at least one redundancy control pressure path (21), at least one ventilation path (19, 19a) and a common electronic control unit (2). Said pressure control circuits (13, 14) can be controlled independently from each other by the electronic control unit (2). Each pressure control circuit (13, 14) has an independent ventilation path (19, 19a) and at least one of the pressure control circuits (13, 14) has an independent redundancy control pressure path (21) and at least one other of the pressure control circuits (13, 14) comprises a device (16a) for forced venting in the event of a failure by means of the associated ventilation path (19a).

A redundancy valve assembly is for redundantly supplying a redundant brake pressure into a service brake pressure path of an electronically controllable pneumatic brake system for a vehicle, preferably a utility vehicle, including a service brake pressure connection for receiving a service brake pressure from a service brake pressure modulator, a redundancy brake pressure connection for receiving a redundancy brake pressure from a redundancy brake pressure modulator, and a brake actuator connection for connecting at least one brake actuator. The redundancy valve assembly is electrically actuatable in order to optionally modulate the service brake pressure or the redundancy brake pressure at the brake actuator connection. An electronically controllable pneumatic brake system includes a redundancy control unit. A vehicle includes the electronically controllable pneumatic brake system. A method is for controlling an electronically controllable pneumatic brake system.

A method for adjusting the clamping force exerted by an electromechanical brake of a motor vehicle, the brake including an electric motor provided with a rotating shaft which is intended to drive a mechanical brake-application mechanism, the electric motor being controlled by a PWM-type voltage controller, in which the rotational speed of the motor is estimated from an estimate of the motor resistance and an estimate of the motor constant, and then the clamping force is determined from the estimate of the rotational speed of the motor, wherein the estimate of the motor resistance is updated during an inactive phase with no voltage control.

Disclosed is a method for controlling brakes in a trailer vehicle comprising a pneumatic brake system, service brakes and an electronic brake system with anti-lock control, wherein at least one axle of the trailer vehicle is fitted with spring-loaded brakes and revolution rate sensors. The method comprises: monitoring with the electronic brake system whether there is a braking demand, monitoring with the electronic brake system whether at least one wheel of at least one axle is locking up, and if there is no braking demand and at least one wheel of the at least one axle is locked while traveling, controlling the pneumatic braking system with the electronic brake system to pressurize the spring-loaded brakes and to brake the trailer vehicle by the service brakes automatically and with anti-lock control. A valve arrangement is also disclosed.

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.