A simulator valve and an electronic brake system using the same are disclosed. The electronic brake system includes a master cylinder provided with at least one cylinder chamber having a volume changeable according to operation of a pedal, a pedal simulator connected to the cylinder chamber, configured to provide reaction force corresponding to a pedal effort of the pedal, a hydraulic-pressure supply device configured to provide hydraulic pressure to at least one wheel cylinder, an electronic control unit (ECU) configured to operate the hydraulic-pressure supply device, and a simulator valve provided in a flow passage through which the master cylinder is connected to the pedal simulator, and provided with a unidirectional flow passage that allows fluid to flow from the pedal simulator to the cylinder chamber and a bidirectional flow passage that is electronically opened or closed.

A solenoid valve for a brake system to control a flow rate of a flow path connecting a first port with a second port includes: an armature disposed inside a sleeve and configured to vertically move in an axial direction together with a plunger to open or close an orifice of a seat; an elastic member providing an elastic force to the armature; a magnetic core configured to accommodate the seat therein and provide a driving force in a direction opposite to the elastic member; an outer filter coupled to a lower side of the seat; an inlet filter coupled to a lower side of the outlet filter; and a lip seal interposed between the outlet filter and the inlet filter and including an inclined protrusion to allow a unidirectional flow of a fluid, wherein the solenoid valve has a flow path opened or closed by vertical movement of the armature and a unidirectional flow path via the lip seal.

Provided is a brake apparatus and a brake control method capable of improving accuracy of control of a wheel cylinder hydraulic pressure. The brake apparatus includes a first brake circuit connecting a master cylinder configured to generate a brake hydraulic pressure according to a pedal operation and a plurality of wheel cylinders configured to generate a braking force on each of wheels of a vehicle by application of the brake hydraulic pressure to each other, a pump configured to increase a pressure of brake fluid in the master cylinder and transmit the brake fluid having the increased pressure to the plurality of wheel cylinders via a second brake circuit connected to the first brake circuit, a plurality of pressure increase control valves provided in the first brake circuit, and a first target upstream hydraulic pressure calculation portion configured to calculate a target hydraulic pressure in the second brake circuit in such a manner that the target hydraulic pressure exceeds a maximum value of target wheel cylinder hydraulic pressures of respective wheel cylinders corresponding to the individual wheels by an amount of a change in the hydraulic pressure in the second brake circuit when a pressure increase control valve corresponding to a wheel other than a maximum hydraulic pressure wheel, of the plurality of pressure increase control valves, is opened.

An electrically or electromagnetically operated valve has a movable structural group with a magnetic armature, which is movable along an axis between a first and a second position to open or close the valve. The valve has a valve sleeve in which the magnetic armature is movable between the first and the second position, the magnetic armature defining on its axial sides two volumes in the valve sleeve. There is provided a throttling element elastic in the radial direction, which is arranged between the first volume and the second volume such that upon axial movement of the movable structural group it throttles an air stream between the first volume and the second volume in order to decelerate a movement of the movable structural group.

Disclosed is a solenoid valve for a brake system. The solenoid valve comprises an armature disposed inside a sleeve to open and close an orifice formed in a seat by moving up and down along an axial direction together with a plunger; an elastic member for providing an elastic force to the armature; a magnet core accommodating the seat therein and providing a driving force to the armature in a direction opposite to the elastic force of the elastic member; a seal stopper coupled to a lower side of the magnet core so as to communicate with the orifice and having a slot on an outer circumferential surface thereof to allow the flow of a fluid through the slot; an outlet filter forming an outer flow passage with the seal stopper; an inlet filter coupled to a lower side of the seal stopper; a lip seal fitted between the seal stopper and the inlet filter and having an inclined protruding portion to allow only one-way flow of the fluid; an orifice flow passage opened and closed by the up and down movement of the armature; and a one-way flow passage formed to include a mesh portion of the outlet filter, a gap formed between a modulator block and the lip seal due to a deformation of the lip seal, and a mesh portion of the inlet filter, wherein the inlet filter includes a protruding portion inclined outwardly so as to have a chamber therein, and the lip seal is provided so that the inside thereof can be inserted into the chamber.

A solenoid valve with an integrated check valve functionality is provided. The solenoid valve comprises first, second, and third ports. The solenoid valve further comprises an armature movable between a first position in which fluid flow from the second port to the third port is blocked and fluid flow from the first port to the third port is unblocked and a second position in which fluid flow from the second port to the third port is unblocked and fluid flow from the first port to the third port is blocked until fluid pressure at the first port exceeds fluid pressure at the third port by a predetermined amount of fluid pressure to thereby provide the check valve functionality. The check valve functionality is integral to the armature. The solenoid valve also comprises an energizeable solenoid for, when energized, moves the armature from the first position to the second position.

A work vehicle is provided with a body and ground engaging means configured to allow motion of the body on ground, and braking means for locking ground engaging means, and an operative element carried by said body and configured to execute a specific working operation. The work vehicle further includes a first and a second joystick configured to respectively control the operation of ground engaging means and operative element based on movement of joystick and first and second input means configured respectively to control the activation/deactivation of parking brake functionality of the work vehicle and the activation/deactivation of hydraulic systems of work vehicle. Furthermore, the work vehicle includes a control system configured to receive second and first control signals derived from first and second input means respectively and each configured to assume a respective activation value and a respective deactivation value and inhibit the operation of the joystick linked to the operation of ground engaging means if both control signals are in activation state.

A power-operated hydraulic brake system for a wheeled vehicle includes a main brake line; a brake valve configured to input a target brake pressure into the main brake line, the brake vale configured to be actuated via a brake pedal; a plurality of wheel brake lines branching off from the brake valve, each of which leads to an actuating unit of a wheel brake; and a valve assembly of an ABS control system. The valve assembly includes an inlet valve arranged between the main brake line and one of the wheel brake lines, and an outlet valve arranged between the relevant wheel brake line and an unpressurized return line. The inlet valve and the outlet valve are pressure-controlled 2/2-way switching valves with correspondingly large switching cross sections, and the inlet valve and the outlet valve are each assigned at least one pilot valve designed as a solenoid switching valve.

A valve device, in particular solenoid valve device, having at least one throughflow region (12), having at least one valve seat (14) and having an actuating unit (16) which has at least one valve body (18), at least an actuating element (20) provided for transmitting an actuation force to the valve body (18), and at least one first ventilation opening (24) arranged outside a fluid contact region (22) of the actuating element (20). The actuating unit (16) has at least one second ventilation opening (26, 28) arranged outside the fluid contact region (22) of the actuating element (20).

An electrically or electromagnetically operated valve has a movable structural group with a magnetic armature, which is movable along an axis between a first and a second position to open or close the valve. The valve has a valve sleeve in which the magnetic armature is movable between the first and the second position, the magnetic armature defining on its axial sides two volumes in the valve sleeve. There is provided a throttling element elastic in the radial direction, which is arranged between the first volume and the second volume such that upon axial movement of the movable structural group it throttles an air stream between the first volume and the second volume in order to decelerate a movement of the movable structural group.