An electric booster is provided having a force-feedback-control structure. The electric booster includes a master piston having a nut unit rectilinearly moved in a booting cylinder space by receiving driving power generated by a motor and a hydraulic pressure generated by a pedal effort. A first screw has a first end connected to the motor and a second end extending into the boosting cylinder, and is rotated by the motor operating with the brake pedal. A second screw is disposed to face the first screw to have a separation space . A connecting member connects the first screw and the second screw. A pressure balancing member has contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and is deformed by a difference between two pressures when applied to the contact surfaces in a longitudinal direction of the first screw, respectively.

An electric booster is provided having a force-feedback-control structure. The electric booster includes a master piston having a nut unit rectilinearly moved in a booting cylinder space by receiving driving power generated by a motor and a hydraulic pressure generated by a pedal effort. A first screw has a first end connected to the motor and a second end extending into the boosting cylinder, and is rotated by the motor operating with the brake pedal. A second screw is disposed to face the first screw to have a separation space. A connecting member connects the first screw and the second screw. A pressure balancing member has contact surfaces in contact with the second end of the first screw and the connecting member, respectively, and is deformed by a difference between two pressures when applied to the contact surfaces in a longitudinal direction of the first screw, respectively.

A brake device of the present invention includes: a wheel brake unit for braking a wheel; an electric motor for driving the wheel brake unit; a speed reducer for decelerating rotation of the electric motor; a rotation-linear motion converter for converting a rotational output of the speed reducer into a linear motion; and a braking force transmission member for transmitting the linear motion produced by the rotation-linear motion converter to the wheel brake unit.

A method and apparatus for holding a motor vehicle by means of an electrically actuated brake comprises applying the brake until a target force is reached. For holding purposes, a motor torque is reduced by applying a negative preset value for a target angular velocity for a motor torque of an electric actuator of the brake.

The electric parking brake device comprising a resolver which has a base arranged in a housing so as to face a rotating plate fixed to a rotation axis of an electric motor, wherein a first sheet coil comprising a detecting coil and a second sheet coil comprising a primary coil of an output transformer coupled to a detecting coil are arranged on the opposite face of the rotating plate, and wherein a third sheet coil comprising a excitation coil opposite to the detecting coil and a fourth sheet coil comprising a secondary coil of an output transformer opposite to the primary coil of the output transformer are arranged on the opposite face of the base.

In a method of braking a number of rail cars of a train travelling on a mainline track, in response to a unique braking command provided to each rail car of a first subset of rail cars, wherein each braking command includes a level or percentage of braking the brakes of the rail car are to assume, the brakes of the rail car are set to level or percentage of braking included in the unique braking command provided to the rail car. Thereafter, in response to a unique braking command provided to each rail car of a second, different subset of rail cars, the brakes of the rail car are set to level or percentage of braking included in the unique braking command provided to the rail car.

The electric parking brake device comprising a resolver which has a base arranged in a housing so as to face a rotating plate fixed to a rotation axis of an electric motor, wherein a first sheet coil comprising a detecting coil and a second sheet coil comprising a primary coil of an output transformer coupled to a detecting coil are arranged on the opposite face of the rotating plate, and wherein a third sheet coil comprising a excitation coil opposite to the detecting coil and a fourth sheet coil comprising a secondary coil of an output transformer opposite to the primary coil of the output transformer are arranged on the opposite face of the base.

The electric parking brake device comprising a resolver which has a base arranged in a housing so as to face a rotating plate fixed to a rotation axis of an electric motor, wherein a first sheet coil comprising a detecting coil and a second sheet coil comprising a primary coil of an output transformer coupled to a detecting coil are arranged on the opposite face of the rotating plate, and wherein a third sheet coil comprising a excitation coil opposite to the detecting coil and a fourth sheet coil comprising a secondary coil of an output transformer opposite to the primary coil of the output transformer are arranged on the opposite face of the base.

A method of controlling an aspirator valve of a vacuum assisted braking system that rapidly fully opens and closes the aspirator valve when an engine of a motor vehicle has been shut-down and the current conditions indicate that ice is likely to have formed in the aspirator valve. The rapid opening and closing of the aspirator valve breaks up any ice buildup thereby de-icing the aspirator valve and allowing normal aspirator valve operation.

A method of controlling an aspirator valve of a vacuum assisted braking system that rapidly fully opens and closes the aspirator valve when an engine of a motor vehicle has been shut-down and the current conditions indicate that ice is likely to have formed in the aspirator valve. The rapid opening and closing of the aspirator valve breaks up any ice buildup thereby de-icing the aspirator valve and allowing normal aspirator valve operation.