The invention relates to a valve arrangement (10) comprising valves and coil arrangements (20), each coil arrangement (20) having two coils (110, 210) which are electrically connected to separate control units (100, 200). Each valve can be independently actuated by either the first coil (110) or the second coil (210) of the coil arrangement (20) associated therewith. The invention further relates to a brake system (400, 500) having such a valve arrangement (10).

A solenoid comprises first and second coils connected to an electrical power supply circuit. In a first mode of operation the power supply circuit is arranged to provide a current flowing in opposite directions through the respective first and second coils, e.g. to produce a self-heating effect. In a second mode of operation the power supply circuit is arranged to provide a current flowing in the same direction through the respective first and second coils, e.g. to generate a magnetic force. In some embodiments, the power supply circuit includes a bridge rectifier or full wave rectifier connected to a bi-directional current driver.

A solenoid comprises first and second coils connected to an electrical power supply circuit. In a first mode of operation the power supply circuit is arranged to provide a current flowing in opposite directions through the respective first and second coils, e.g. to produce a self-heating effect. In a second mode of operation the power supply circuit is arranged to provide a current flowing in the same direction through the respective first and second coils, e.g. to generate a magnetic force. In some embodiments, the power supply circuit includes a bridge rectifier or full wave rectifier connected to a bi-directional current driver.

According to an aspect of the present disclosure, it provides an electronic brake system including a pedal simulator configured to provide a reaction force according to a pedal force of a brake pedal, an actuator configured to generate a hydraulic pressure using an actuator piston that operates by an electrical signal output corresponding to a displacement of the brake pedal and including a first chamber provided at one side of the actuator piston movably accommodated in an actuator cylinder and connected to one or more wheel cylinders and a second chamber provided at the other side of the actuator piston and connected to one or more wheel cylinders, a first hydraulic circuit including first and second inlet flow channels branched from a first hydraulic flow channel configured to communicate with the first chamber to be connected to two wheel cylinders, respectively a second hydraulic circuit including third and fourth inlet flow channels branched from a second hydraulic flow channel configured to communicate with the second chamber to be connected to two wheel cylinders, respectively, and a reservoir connected to the actuator and the first and second hydraulic circuits and configured to store brake fluid, wherein a hydraulic pressure unit connected from the actuator to the one or more wheel cylinders are hydraulically separated from a pedal force unit connected from the brake pedal to the pedal simulator.

A brake system, including four hydraulically actuatable wheel brakes. Each wheel brake is assigned in each case one outlet valve which is closed when electrically deenergized. Each wheel brake is assigned in each case one inlet valve which is open when electrically deenergized. The brake system furthermore includes a simulator which is actuatable by a brake pedal, wherein two pressure provision devices are provided for actively building up pressure in the wheel brakes, two brake circuits are hydraulically formed, wherein, in each brake circuit, in each case one pressure provision device is hydraulically connected to two wheel brakes, and wherein two separate on-board electrical systems are provided, and wherein each pressure provision device is fed in each case by one of the two on-board electrical systems.

A brake installation for a motor vehicle. First and second pressure provision devices build up brake pressure in the wheel brakes. The first pressure device connected to a first wheel brake of a first brake circuit and to a second wheel brake of the first brake circuit. The second pressure device connected to a third wheel brake of a second brake circuit and to a fourth wheel brake of the second brake circuit. Each pressure device is respectively activated by an open-loop/closed-loop control unit. A first hydraulic line, with a normally open isolating valve, connects the first wheel brake line of the first brake circuit to the first wheel brake line of the second brake circuit. A second hydraulic line, with a normally open isolating valve, connects the second wheel brake line of the first brake circuit to the second wheel brake line of the second brake circuit.

A valve assembly including: a valve body comprising a valve chamber, a first fluid port, a second fluid port, and a third fluid port, wherein the first fluid port, the second fluid port and the third fluid port are in fluid communication with the valve chamber; a first plunger movably disposed within the valve chamber, wherein when the first plunger is in the open position, the first fluid port is in fluid communication with the second fluid port, and wherein when the first plunger is in the closed position the first fluid port is fluidly isolated from the second fluid port; and a second plunger movably disposed within the valve chamber, wherein when the second plunger is in the open position the second fluid port (8b) is in fluid communication with the third fluid port, and wherein when the second plunger is in the closed position, the second fluid port is fluidly isolated from the third fluid port.

Disclosed herein is an electronic brake system. The electric brake system includes a pedal operator connected to a brake pedal and configured to transmit a braking intention to an electronic control unit; a reservoir configured to store a working fluid; a pressure supplier provided with a driver providing a power, and configured to generate a hydraulic pressure of a plurality of wheel brakes; and a braking pressure regulator configured to regulate a hydraulic pressure, which is generated by the pressure supplier and transmitted to the wheel brake, wherein the braking pressure regulator includes a first hydraulic circuit hydraulically connected to two wheel brakes and a second hydraulic circuit hydraulically connected to the other two wheel brakes, wherein the first hydraulic circuit and the second hydraulic circuit are provided with a plurality of inlet lines connecting the pressure supplier to each of the wheel brake, and a plurality of outlet lines connecting each of the wheel brake to the reservoir or connecting each of the wheel brake to the pedal operator, wherein the first hydraulic circuit and the second hydraulic circuit are hydraulically separated from each other to regulate a hydraulic pressure, which is transmitted to the wheel brake by the other hydraulic circuit when any one hydraulic circuit operates abnormally.

Am electric braking system is disclosed. The electric braking system comprising: a cylinder unit having a first piston connected to a brake pedal, a cylinder chamber with the volume varying by displacement of the first piston, and a pressing chamber with the volume varying by a pressing member, and sending an intention of braking to an electronic control unit; a reservoir storing a working fluid, a pressure applier having a second piston operating by receiving power and a pump chamber with the volume varying by displacement of the second piston, and hydraulically coupled to wheel brakes, a reservoir line connecting the cylinder chamber and the reservoir and having a reservoir valve; and a pump reservoir line connecting the pump chamber and the reservoir and having a dump valve.

Provided are an electromagnetic valve capable of suppressing an increase in size in an axial direction thereof, a fluid pressure control device, and a brake apparatus. A first filter member configured to filter a fluid is provided in a flow path between a valve seat and a second communication bore.