An electronic parking brake system including: an electronic parking brake provided to generate a clamping force on a wheel of a vehicle; and a controller configured to estimate a weight of the vehicle based on a wheel pressure and a longitudinal acceleration of the vehicle at a time of service braking during driving, determine a clamping force required for parking based on the estimated weight of the vehicle during a parking operation, and operate the electronic parking brake to generate the determined clamping force.

Disclosed herein an electric parking brake (EPB) system includes a first EPB provided on a left wheel of a vehicle; a second EPB provided on a right wheel of the vehicle; and a controller configured to determine an EPB that is to be operated alone from among the first and second EPBs in response to a gear being shifted to a P-stage, and operate the determined EPB alone.

A method for operating a braking system, wherein a switchable connection between two connection points is open in normal operation, and a voltage difference across the switchable connection is reduced by recuperation before said switchable connection is closed, which serves to compensate for a disturbance in an on-board electrical system. As a result, it is possible to avoid excess currents in the event of the closing of the switchable connection.

Braking system for carrying out additional safe braking functions

Various embodiments of a braking system (500) for at least one bogie or railway vehicle comprising an emergency braking control unit (503) made according to a first safety integrity level and a service braking control unit (508) made according to a second safety integrity level lower than said first safety integrity level are described; the braking system (500) carrying out at least one additional braking function (550) at the same safety integrity level as the emergency braking control unit (503).

A trailer air supply and control module for a electronic brake system of a motor vehicle with a trailer interface, and a brake system of a motor vehicle with a trailer interface comprising the trailer air supply and control module, includes at least two electrical terminals configured to receive two independent but redundant electrical control input signals which comprise a signal for a preset brake control outlet pressure. At least one valve is configured to adjust a constant air pressure from an air pressure source to the preset brake outlet pressure. One pneumatic outlet terminal is configured to provide the preset brake supply outlet pressure to the pneumatic brake system of the trailer, and one pneumatic outlet terminal is configured to provide the preset brake control outlet pressure to the pneumatic brake system of the trailer. The air pressure source is arranged within the trailer air supply and control module.

A braking system for a heavy duty vehicle includes a first brake controller arranged to control braking on a first wheel and a second brake controller arranged to control braking on a second wheel, based on a respective configured wheel slip limit and on a respective brake torque request, wherein the first and the second brake controllers are interconnected via a back-up connection arranged to allow one of the first and the second brake controller to assume braking control of the wheel of the other of the first and the second brake controller in case of brake controller failure, the braking system comprising a control unit arranged to, in response to brake controller failure, reduce the configured wheel slip limit associated with the failed brake controller to a reduced wheel slip limit.

A brake control device (10) for delivering air under controlled pressure to a pneumatic brake actuator (BA), comprising an inlet port (51) coupled to a compressed air supply circuit, a working port (54) coupled to a service brake chamber (C2) of the brake actuator (BA), a venting port (56), first and second inlet solenoid valves (31, 32) for selectively connecting inlet port(s) to the working port, first and second outlet solenoid valves (41, 42) for selectively connecting the working port to venting port(s), a biased check valve (12), for coupling the working port to venting port(s), the brake control unit device further comprising first and second local electronic control units (21, 22) for controlling independently first and second inlet solenoid valves and first and second outlet solenoid valves.

The invention concerns an electronic parking brake system (2), comprising an air supply (4), a check valve (6), connected to the air supply, an electro-pneumatic control unit (8), at least one park brake actuator (10), a relay valve (12), comprising a first port (12a) connected to the check valve, a second port (12b) connected to the electro-pneumatic control unit, a third port (12c) connected to the park brake actuator and a fourth port (12d) which is in communication with the atmosphere, and an electrically actuated valve (14), which is controlled by the electro-pneumatic control unit (8) and which includes a first orifice (14a) connected to a compressed air line (16) extending between the check valve and the air supply, a second orifice (14b), a third orifice (14c) connected to the electro-pneumatic control unit (8), and preferably a vent orifice. The second orifice (14b) is connected to another compressed air line (18) extending between the check valve (6) and the first port (12a) of the relay valve (12).

A method of determining a homing position of a piston within a plunger assembly for a vehicle brake system at the beginning of an ignition cycle of the vehicle includes first providing a plunger assembly having a housing defining a bore therein. The plunger assembly includes a piston slidably disposed in the bore for pressurizing fluid within a pressure chamber when the piston is moved in a first direction. The plunger assembly further includes an electrically operated linear actuator for moving the piston within the bore. The method further includes providing electrical power to the linear actuator of the plunger assembly. The linear actuator is actuated to retract the piston in a second direction opposite the first direction towards an end stop. The piston engaging with the end stop is then detected.

An axle valve module of a compressed air brake system includes a relay valve with a control pressure input connected to a control pressure line which can be connected via a changeover valve alternately to a brake pressure line conducting an introduced brake pressure or to a reservoir pressure line conducting a reservoir pressure. ABS inlet and outlet valves are each formed as a pressure-controlled diaphragm valve with assigned pilot valve, wherein the pilot valves are configured as cyclically controllable 3/2-way magnetic switching valves, A shut-off valve is arranged in the control pressure line of the relay valve, between the changeover valve and the control pressure input of the relay valve or the branch point of a control pressure line of the ABS valves, via which shut-off valve the control pressure present at the control pressure input of the relay valve can be locked in as required.