A magnetic valve includes a valve component and a valve body that engages around a region of the valve component in a hood-like manner and in a sealing manner in at least one sealing region. A flow chamber is formed between the valve body and an end face of the valve component. The valve component has an axially running through-channel with a constant cross-section which passes through the end face and which opens into the flow chamber so as to form an axial duct for a fluid. The valve body has a through-opening that is fluidically connected to the flow chamber and is configured to be closed by a closing element that is movably arranged on a valve body face that faces away from the flow chamber. The end face is configured as a type of lip seal ring.

The invention relates to an apparatus (1) and a method for driving a solenoid valve (3), having an evaluation and control unit (10), a PWM apparatus (20) and a current measuring apparatus (AM), wherein, in normal operation, the evaluation and control unit (10) generates a PWM signal (PWM) having a duty ratio (TV) and emits said PWM signal to a magnet assembly (3.1) of the solenoid valve (3) by means of the PWM apparatus (20), wherein the current measuring apparatus (AM) detects a current (I) through the magnet assembly (3.1) resulting from the PWM signal (PWM) and reports said current back to the evaluation and control circuit (10), wherein a current (I) that is above a response threshold of the magnet assembly (3.1) triggers a switching process of the solenoid valve (3), and wherein, in test operation, the evaluation and control circuit (10) generates and emits at least one test PWM signal (TPWM1, TPWM2) having a duty ratio (TV1, TV2) by means of the PWM apparatus (20), said at least one test PWM signal inducing a test current (IT1, IT2) that is below the response threshold through the magnet assembly (3.1), and to a hydraulic assembly having such an apparatus (1) for driving a solenoid valve (3). In this case, in test operation, the evaluation and control unit (10) generates and emits at least two different test PWM signals (TPWM1, TPWM2) and detects the resulting test currents (IT1, IT2), wherein the evaluation and control unit (10) derives presently prevailing ambient conditions from the predefined test PWM signals (TPWM1, TPWM2) and the resulting test currents (IT1, IT2) and, in normal operation, generates and emits a subsequent PWM signal (PWM) based on the presently prevailing ambient conditions, said subsequent PWM signal inducing a current (I) that is above the response threshold, for the purpose of switching the solenoid valve (3).

An actuation system for at least one hydraulically actuatable device, e.g., a vehicle brake, may include an actuation device, e.g., a brake pedal, at least one first pressure source that can be actuated using the actuation device, and a second pressure source having a pressure-generating arrangement that is moveable in two directions, and which includes an electro-mechanical drive for the pressure-generating arrangement. Each pressure source is connected via at least one hydraulic line to the hydraulically actuatable device for supplying pressurising medium. A valve device may regulate pressure of the hydraulically actuatable device. Pressurising medium can be supplied in a controlled manner in both movement directions of the pressure-generating arrangement. Provision is made for two working chambers of the second pressure source to be connected by a hydraulic line, and a valve device may be arranged in the hydraulic line.

Provided is a braking device for a vehicle comprising: a first hydraulic pressure generation unit which generates hydraulic pressure corresponding to the volume of a master chambers in the master chambers that change in volume according to the movement of master pistons; a second hydraulic pressure generation unit which is configured so as to be capable of generating a desired hydraulic pressure in a bottoming state in which the forward movement of the master pistons is restricted by a master cylinder; braking force generation units which apply the braking force corresponding to the input hydraulic pressure to wheels of a vehicle; and a braking force control unit which causes the second hydraulic pressure generation unit to generate hydraulic pressure in the bottoming state, and inputs the hydraulic pressure to the braking force generation units.

A solenoid valve comprises a valve closing body, which can open or close a valve passage formed in a valve seat body which is pressed into a valve housing, and comprising a magnet armature acted upon by a restoring spring, arranged in a through-bore of the valve housing. In addition to a press-fit segment, the valve seat body has a clearance-fit segment along the outer jacket of the valve seat body. The clearance-fit segment has a reduced outside diameter in relation to the press-fit segment. The valve housing also has a tube segment, which deflects radially inward and which has a constant inside diameter that is reduced relative to the outside diameter of the press-fit segment. The tube segment thus deflecting into the clearance-fit segment of the valve seat body because of the elasticity of the tube segment.

Provided is a brake device capable of detecting abnormality condition of a subject valve without using a wheel pressure sensor and the vehicle brake device includes a valve which is configured to open and close a fluid passage connected to the master chamber and at the same time which is a subject valve for a subject of failure judgement and an abnormality judging portion which is configured to judge whether or not the subject valve is in an abnormal state based on an advancement amount of the master piston accompanying an opening of the subject valve.

An electromagnetically actuated valve, in particular a pressure control valve of a slip-controllable vehicle brake system, includes a seat body with a valve seat, at least one inflow channel, and an outflow channel. The valve includes a shut-off element configured to avoid a hydraulic short circuit between the inflow channel and the outflow channel when the valve seat is closed. The shut-off element is equipped with flow-directing means. The flow-directing means prevent the partial flows from the inflow bores from hitting each other and direct the flow to a closing body, which controls the valve seat, in such a way that a transverse force is applied to the closing body when the closing body performs a stroke motion. The transverse force radially deflects the closing body during an opening or closing motion and causes an effect that stabilizes the stroke motion and dampens radial vibrations.

An object of the present invention is to provide a brake apparatus capable of acquiring a sufficient braking force when an abnormality has occurred. The brake apparatus includes a stroke simulator. The stroke simulator is connected to a portion of an oil passage between a master cylinder and a valve. The oil passage connects the master cylinder and a wheel cylinder therebetween. The stroke simulator is configured to generate a brake operation reaction force due to an increase and a reduction in a volume of a positive pressure chamber formed inside the stroke simulator. Brake fluid contained in a first chamber of the master cylinder flows into the positive pressure chamber at the time of control by a by-wire control unit. A fluid amount that can be supplied from the first chamber is larger than a fluid amount that the positive pressure can absorb therein.

A valve assembly for an antilock system of a brake system of a vehicle includes a cylindrical rotary valve rotatably mounted in a valve block and configured to be activated by a step motor, configured to occupy at least two shifting positions, and having one input and one output. In one of the shifting positions, at least one duct leading to a wheel brake cylinder can be acted upon with a pressurizing medium via the input. In another of the shifting positions, the pressurizing medium can be discharged via the output. The input and the output of the rotary valve are arranged in different axial planes and at an angle offset to one another.

A control device for a two-stage solenoid valve, including an activation unit which outputs a current flowing through a solenoid coil of the solenoid valve as a switching signal. The solenoid valve is switchable from its de-energized switching state into its energized switching state by increasing a current intensity of the switching signal from zero to a switching current intensity. The solenoid valve is switchable from its energized switching state into its de-energized switching state by designing the activation unit to set the current intensity of the switching signal during a switching time interval to at least one current intensity value between zero and the switching current intensity, reduce it to zero after the switching time interval and during the switching time interval, increase it at least twice, each for a predefined pulse time interval, to a predefined current pulse value between zero and the switching current intensity.