Abstract: Hydraulic pressure control apparatus for controlling a pressure of a brake cylinder pressure, including a pump device connected to the brake cylinder and including at least one set of a pump for delivering a pressurized fluid to the brake cylinder and a pump operating electric motor, a low-pressure source for storing the fluid discharged from the brake cylinder, a solenoid-operated pressure control valve disposed between the low-pressure source and the brake cylinder and operated with an electric energy applied thereto, for controlling the brake cylinder pressure depending upon the electric energy, and a controller including a pressure increase control device for increasing the brake cylinder pressure by controlling the electric motor, and a pressure reduction control device or reducing the brake cylinder pressure by controlling the electric energy applied to the control valve.

Abstract: An antilock brake control system for a vehicle including normally-opened solenoid valves, normally-closed solenoid valves, and diodes. Each of the normally-opened solenoid valves is switched over among a turned-on state in which a predetermined first electric current is permitted to flow through the coil, a turned-off state in which the supply of the electric current to the coil is topped, and a middle state in which a second electric current lower than the first electric current is permitted to flow. In addition, the system includes a switch that is maintained in an electrically disconnecting state during shifting of each of the normally-opened solenoid valves from the turned-on state to the middle state, until the shifting is completed.

Abstract: A pneumatic braking method and system for a vehicle is provided. The system includes a brake cylinder, a reservoir, a latching exhaust valve (LEV) movable between an open position and closed position and fluidly connected between the reservoir and the brake cylinder. The LEV includes a first solenoid having a first pilot fluidly connected to the reservoir and a second solenoid having a second pilot fluidly connected to the reservoir wherein the pilots are configured to be controlled electronically and pneumatically, and are selectable between electronic and pneumatic control based on vehicle operating requirements. The solenoids are configured to be piloted with pneumatic pressure from the reservoir and an electronic controller that includes a release on failure circuit. The release on failure circuit is configured to control the LEV during at least one of a loss of power to the braking system and a failure of the electronic controller.

Abstract: An anti-lock controller controls an anti-lock brake system so as to realize any of a pressure decreasing mode where a normally-opened electromagnetic valve is closed, while a normally-closed electromagnetic valve is opened, a holding mode where the normally-opened electromagnetic valve is closed and the normally-closed electromagnetic valve is closed, and a pressure increasing mode where the normally-opened electromagnetic valve is opened, while the normally-closed electromagnetic valve is closed. Then, in the holding mode, for example, in the event that a predetermined condition is established where the voltage of a power supply for a vehicle or the terminal voltage of the normally-opened electromagnetic valve is equal to or smaller than a set value which is determined in advance, a current value that is applied to the normally-opened electromagnetic valve is controlled so as to become smaller than a current value that is applied to the normally-opened electromagnetic valve in the pressure decreasing mode.

Abstract: The present invention relates to a valve assembly whose first valve accommodating member is conformed to the inside diameter of a second valve accommodating member in such a fashion that the first valve accommodating member is inserted without clearance so far into the second valve accommodating member that the first valve closure member is supported either on a bore step of a second pressure fluid passage or on the first valve accommodating member.

Abstract: A filter assembly for a control valve for controlling fluid flow in a hydraulic control unit of a vehicular brake system includes a substantially annular filter body. The body has an inner surface, an outer surface, a first end, and a second end. The inner surface defines an axial bore from the first end to the second end of the body. A portion of the axial bore adjacent the first end receives a portion of a valve body. The filter body is disposed within a bore of a housing. The outer surface defines a first axial groove. The housing contains a valve. The first end of the filter body defines a first radially extending groove which extends between the axial bore and the first axial groove. A filter portion is disposed within the axial bore for filtering fluid flowing through the axial bore.

Abstract: The invention relates to a device for making contact between a solenoid and an electronic control unit arranged neighboring a valve block, wherein the solenoid projects away from a side wall of the valve block by a magnetic coil and a magnetic core, contact elements being arranged in an end face region of the solenoid facing towards the valve block in such a way that the contact elements can be directly electrically connected to corresponding contact elements arranged on a wall of the electronic control unit or of the valve block.

Abstract: A solenoid-controlled valve of an anti-lock brake system includes: a modulator block with inflow and outflow ports; an accommodating part connecting the ports including a valve sheet having a valve seat and an outflow cavity connected with the outflow port; a filter installed between the outflow cavity and the outflow port; a ball supporting part formed on a center of a housing in lengthwise direction; a spring supporting part formed on the ball supporting part; a compressing spring joined to the spring supporting part; a ball supported by an end terminal of the compressing spring; wherein the housing has a magnetic material and a coil body, and the ball opens and closes the valve seat due to the magnetic flux of the solenoid and force of the compressing spring.

Abstract: A magnet valve, including a pole core, an armature, a restoring element disposed between the pole core and the armature to restore the armature to its outset position a stop face on the pole core oriented toward the armature having at least one rib extending all the way around in the circumferential direction and protruding toward the armature, and/or a stop face of the armature oriented toward the pole core and having at least one rib extending all the way around in the circumferential direction and protruding toward the pole core.

Abstract: A valve seat assembly for a control valve of a vehicle brake system includes a valve seat body. A valve passageway extends through a portion of the valve seat body. A groove is formed circumferentially in an outer surface of the valve seat body. The groove defines a groove surface substantially parallel to an axis of the valve body. A bore extends between the groove surface and the valve passageway to provide fluid communication between the groove surface and the valve passageway. A substantially resilient seal is disposed in the groove of the valve seat body.

Abstract: An electromagnetically actuated valve including a housing having a fluid path and a valve retaining bore located in course of the fluid path, a tubular valve casing mounted to the valve retaining bore, a valve body electromagnetically operative to axially move within the tubular valve casing and allow and prevent a flow of fluid passing through the fluid path of the housing, and a filter disposed at an axial end of the tubular valve casing. The filter includes a fluid passage communicated with the fluid path of the housing.

Abstract: In a system for controlling a brake valve, the supply voltage available for controlling the electromagnet of the brake valve is continually measured during operation and the effective value of the voltage present at the coil of the electromagnet is varied by varying the duty factor of the pulse times according to the supply voltage supplied at the time.

Abstract: An electromagnetically actuatable valve for hydraulic control devices in motor vehicles is embodied as a pressure-equalized seat valve in a mode of construction comprising a hydraulic part with a valve dome and an electrical part that can be slipped onto the valve dome. In a magnet valve that is normally open, the tubular tappet that supports the closing member is supported at one point in a first bearing point, in terms of the longitudinal direction, that is embodied as a slide bearing, and a bearing ring that forms the sealing point accomplishes the hydraulic pressure equilibrium with the effective sealing diameter of the closing member that together with the valve seat forms the second bearing point. With the valve, very short switching times, in particular less than 0.5 ms, can be achieved with an economical mode of construction.

Abstract: A brake fluid pressure control device controls brake fluid pressures through control of fluid pressure control valves operated in accordance with control signals from, for example, a computer. Signal lines for supplying control signals to control circuits controlling coils of linear valve devices for some wheels (e.g., front-left and rear-right wheels) are connected to a brake ECU by a connector, and signal lines for supplying control signals to the control circuits controlling coils of linear valve devices for other wheels (e.g., front-right and rear-left wheels) are connected to the brake ECU by a different connector. Thus, even if one of the connectors starts operating abnormally, it is possible to supply control signals via the signal lines connected by the other connector and control linear valve devices for some of the wheels (e.g., a pair of diagonally located wheels).

Abstract: According to the present invention, a cylindrical member of a solenoid valve is provided with a protruding portion that protrudes in an axial direction of the cylindrical member. By fitting the protruding portion into a vertical groove of a plunger, it is possible to restrict the cylindrical member from moving in a peripheral direction of the plunger. Therefore, it is possible to prevent change of the flow path that passes the plunger and the vertical groove, as well as to prevent variation in a sliding speed of the plunger or the like. As a result, a fluid pulsation reduction effect is obtained.

Abstract: The present invention discloses a braking device comprising an assembled control mechanism wherein a first plug-in housing unit essentially containing the electronic components on one or more component support members, is plugged together with a block-shaped solid part on a first surface of the solid part for establishing a magnetic and electrical connection, with said solid part including magnetically operated hydraulic valves for the actuation of the brakes and hydraulic lines, and wherein the device comprises pressure sensors for measuring the pressure in the hydraulic lines at appropriate measuring points. The braking device is characterized in that the pressure sensor(s) is/are integrated in the assembled control mechanism.

Abstract: The return pumps of brake systems with a precharging device are greatly stressed by the precharging pressure and subjected to premature wear. Significant leakage occurs in the long run which will damage the pump motors in the worst case. This is prevented by controlling the pressure fluid supply from the precharging source to the suction side of the return pump as a function of the pressure gradient in this connecting line. To this end, an electromagnetically operated on-off valve (23) with a hydraulically insertable throttle is used.

Abstract: A control valve for controlling fluid flow in a hydraulic control unit of a vehicular brake system includes a valve seat. A sleeve is mounted on the valve seat. An armature core is slidably received in the sleeve. The sleeve includes a first ferromagnetic portion adjacent the valve seat, a second ferromagnetic portion, and an annular region defining an area of increased magnetic reluctance. A part of the first portion of the sleeve defines a radial magnetic pole for the generally radial flow of magnetic flux from the armature to the sleeve. A portion of the valve seat adjacent the armature defines an axial magnetic pole for the generally axial flow of magnetic flux from the armature to the valve seat. Together, the generally radial flow of flux and the generally axial flow of flux generate a force urging the armature from an open position toward a closed position when the coil is energized.

Abstract: The present invention relates to a pressure control valve, in particular for electrohydraulic brake systems, including a valve member arranged in a valve housing and a sensor element for determining the fluid pressure that prevails in the valve housing. The fluid pressure in the valve housing is indirectly determined by the sensor element by way of the deformation of the valve housing.

Abstract: A brake traction control valve is disclosed. The brake traction control valve includes a valve core, a shell, an armature, an exciting coil, a plunger, and a return spring. The valve core has an inlet to allow inside and outside of the valve core to communicate with each other, and a valve seat provided with an orifice therein. The shell having a dome plus cylinder shape is coupled to the valve core to cover one end of the valve core. The armature is placed in the shell to move forward and backward. The exciting coil is placed around the shell to cause the armature to move forward and backward. The plunger is placed in the valve core to move forward and backward to selectively open and dose the orifice while moving forward and backward by the armature. The return spring returns the plunger and the armature to open the orifice.

Abstract: A brake traction control valve is disclosed. The brake traction control valve includes a valve core, a shell, an armature, an exciting coil, a plunger, a return spring, a closing member and a relief spring. The valve core has an inlet to allow inside and outside of the valve core to communicate with each other, and a valve seat provided with an orifice therein. The shell having a dome plus cylinder shape is coupled to the valve core to cover one end of the valve core. The armature is placed in the shell to move forward and backward. The exciting coil is placed around the shell to cause the armature to move forward and backward. The plunger is placed in the valve core to move forward and backward to selectively open and close the orifice while moving forward and backward. The return spring returns the plunger and the armature to open the orifice. The closing member is located in an end of the plunger to move forward and backward to selectively open and close the orifice.

Abstract: The invention relates to a hydraulic assembly for slip-controlled brake systems of motor vehicles, having a valve block (8) with receiving bores (6), each for a hydraulic part (2) of electromagnetically actuated valves (1), each of which contains magnetically active elements such as an armature (16) and a magnetic core (24) of the valve dome (10) that contains the hydraulic part (2), and a respective electric part (4), which is slid onto the valve dome (10) and has an electric coil (50) encompassing this valve dome (10), a coil housing (52), and a washer (54) that is contained at least indirectly in the coil housing (52), on the side oriented toward the hydraulic part (2).

Abstract: The present invention provides a proportional microvalve having a first, second and third layer, and having high aspect ratio geometries. The first layer defines a cavity with inlet and outlet ports. The second layer, doped to have a low resistivity and bonded between the first and third layers, defines a cavity having a flow area to permit fluid flow between the inlet and outlet ports. The second layer further defines an actuatable displaceable member, and one or more thermal actuators for actuating the displaceable member to a position between and including an open and a closed position to permit or occlude fluid flow. The third layer provides one wall of the cavity and provides electrical contacts for electrically heating the thermally expandable actuators. The thermal actuators and the displaceable member have high aspect ratios and are formed by deep reactive ion etching such that they are displaceable in the plane of the second layer while being very stiff out of the plane.

Abstract: A three-state magnet valve for control of fluid flow engageable with a source of fluid pressure for connecting the three-state magnet valve to a source of fluid pressure. The three-state magnet valve also has an application pilot solenoid valve having a fluid connection to a source of fluid pressure and is electrically connectable to a control module. The three-state magnet valve further has an application solenoid valve having a fluid connection to a source of fluid pressure and to an application pilot solenoid valve and a braking device. The application solenoid valve is also electrically connectable to a control module. The application solenoid valve is able to initiate a braking application upon receipt of a fluid signal from the application pilot solenoid valve and an electrical signal from a control module.

Abstract: An electromagnetic valve has a cylindrical-shaped valve housing, a fixing core; a movable core; a first return spring; a coil; a first valve mechanism including a movable seat member, a second return spring, a first valve part, a first valve seat, and a first valve hole, and a second valve mechanism including a cylindrical-shaped valve seat member, a second valve seat, a second valve hole, and a second valve part, wherein, on the movable seat member, a cylindrical-shaped guide part, when the second valve part is seated on the second valve seat, is cut off from the valve chamber but, when the second valve part is separated from the second valve seat, forms an annular-shaped passage communicating with the valve chamber and is slidably fitted into the second valve hole; and a communication passage for allowing the annular-shaped passage to communicate with the interior of the guide part is formed.

Abstract: The present invention is directed to a hydraulic brake apparatus provided with a pressure generator for generating hydraulic pressure in response to operation of a manually operated braking member, and a pressure regulating device disposed between the pressure generator and a wheel brake cylinder, and connected with a reservoir, so as to regulate the hydraulic pressure fed into the wheel brake cylinder to provide a desired pressure less than the hydraulic pressure generated by the pressure generator.

Abstract: A damping force control type hydraulic shock absorber includes a plunger having a small-diameter main body portion slidably guided by a first fixed core made of a magnetic material. The plunger has a large-diameter attracted portion at an end thereof closer to a second fixed core. The diameter (D2) of the attracted portion is set larger than the diameter (D1) of the main body portion (D2>D1), thereby increasing the area of the mutually opposing surfaces of the attracted portion and the second fixed core. Accordingly, attraction force acting on the attracted portion can be increased without reducing the magnetic flux density at the main body portion.

Abstract: A poppet type solenoid valve used in an electronically controllable vehicle hydraulic brake system is proposed which suppresses sound and vibration and simultaneously eliminates malfunction. For these effects, the following conditions have to be satisfied: FSP/(r2−B2)<67  (1) FSP·St2/(r2−B2)>29  (2) wherein FSP is the force of the spring, r is the tip diameter of the poppet, St is the stroke of the poppet, and B is the diameter of the area of the poppet where the valve-opening force by hydraulic pressure does not work on the poppet under the Bernoulli effect.

Abstract: The valve (10) has a seat valve (27) comprising a hollow cone-shaped valve seat (24) and an hemispherical shutoff element (26). An afflux bore (23) having contact with a pressure-medium inlet (19) discharges centrically into the valve seat (24). A solenoid armature (30) acting upon the seat valve (27) in opening fashion grips a push rod (25) comprising the shutoff element (26). The solenoid armature cooperates with a pole body (42) according to the flat-type armature principle. A preloaded return spring (39) acting on the seat valve (27) in closing fashion is arranged between the pole body (42) and the solenoid armature (30).

Abstract: The present invention relates to a valve assembly whose first valve accommodating member (5) is conformed to the inside diameter of a second valve accommodating member (6) in such a fashion that the first valve accommodating member (5) is inserted without clearance so far into the second valve accommodating member (6) that the first valve closure member (4) is supported either on a bore step (10) of a second pressure fluid passage (8) or on the first valve accommodating member (5).

Abstract: This invention is to provide a brake system and a brake device for use of automobiles, in which a braking energy stored in an auxiliary pressure source can be exploited effectively for a braking purpose, even if an electrical system fails. In particular, the vehicle brake system includes a proportional pressure control valve 80 for generating braking liquid pressure by adjusting the braking energy stored in the auxiliary pressure source 30. Also the vehicle brake system comprises a passage 75 transmitting the liquid pressure generated by a stroke of a brake pedal 1, a switching valve 76 opening the passage in the powered condition and closing the same in the off-powered condition, and an auxiliary control portion 81 activating the proportional pressure control valve 80. Even in the off-powered condition, the high pressure accumulated in the auxiliary pressure source 30 can be used to adjust the required braking liquid pressure at the proportional pressure control valve 80.

Abstract: The invention relates to an electrohydraulic brake device, in particular a brake slip control device (1) for motor vehicles, including one or more electromagnetically actuatable hydraulic valves contained in a valve block (6), having valve domes, which protrude at least partway beyond the valve block (6) in the direction of a valve axis (8) and each engage in a coil opening (14) of an electric coil (12) held by a coil holder (10), and having contact elements (20), which protrude away from the coils (12) and through openings (34) of a top plate (32), in order to electrically activate the coils (12).

Abstract: In a brake control apparatus according to the present invention, a range of change in a hydraulic pressure with respect to an amount of current applied by a drive signal from a control circuit of an N/O valve provided in a hydraulic path that extends from a hydraulic pressure generation source to a wheel cylinder is set to be smaller than a range of change in a hydraulic pressure with respect to an amount of current applied to an N/C valve provided in a hydraulic path that extends from the wheel cylinder to a reservoir. Accordingly, it is possible to decrease the hydraulic pressure which is generated when the amount of current is minutely varied in the N/O valve, thereby enhancing controllability of the hydraulic pressure. This enables highly accurate hydraulic control.

Abstract: A control valve for controlling fluid flow in a hydraulic control unit of a vehicular brake system includes a valve seat. A sleeve is mounted on the valve seat. An armature core is slidably received in the sleeve. The armature core has a passage extending between first and second planar end surfaces of the armature core. An armature body is formed from a moldable material onto the armature core. The armature body has a central section received in the passage of the armature core, a first end section extending from the first end surface of the armature core, and a second end section extending from the second end surface of the armature core. This control valve is particularly adapted to be mounted in a bore of a housing of a hydraulic control unit of an electronically controlled vehicular brake system.

Abstract: The invention relates to a proportional valve, especially for regulating the shifting pressure in an automatic transmission for a motor vehicle. The inventive valve is subdivided into a hydraulic section and into an electric section by a magnetic interface (XXXX). The bearing points (1, 2) of the hydraulic valve slide are arranged on the side of the valve opposite the electric coil, i.e. in the hydraulic section, so that the armature (5) projects into the coil space in a floating manner.

Abstract: A solenoid valve for brake systems, including a spool movably set in a valve housing, provided along its central axis with the first orifice which has a predetermined diameter, and provided at a position around the plunger with a plunger guide having a predetermined depth for allowing the plunger to enter the spool, thus opening and closing the first orifice. A valve seat portion is formed on the inner surface of the bore of the valve housing by stepping the surface. This valve seat portion defines the second orifice therein, and comes into contact with or spaced from the end of the spool to selectively open the outlet, separately from the first orifice when the spool moves in either direction. The second orifice has an inner diameter larger than that of the first orifice. A spool restoring spring normally biases the spool toward the plunger.

Abstract: The present invention relates to an electromagnetic valve, including a housing base member for attachment in a valve accommodating member, with a valve sleeve in which a magnetic armature is guided being positioned on the housing base member, with a tappet interacting with the magnetic armature and having a valve closure member that faces a valve seat member, as well as with a yoke ring that encompasses a valve coil seated on the housing base member, wherein the housing base member, the valve sleeve, the magnetic armature, the tappet, and the yoke ring are designed as preassembled subassemblies, and the valve accommodating member includes a standard type of bore for the attachment of the housing base member, and for the final assembly of the valves, the subassemblies are joined in one single direction of assembly.

Abstract: The present invention relates to an improved hydraulic brake system for controlled and comfortable braking operations which includes a hydraulic pump for build-up of a hydraulic pressure that effects braking and a valve assembly by way of which the hydraulic pressure can be reduced, the hydraulic system being in particular characterized in that the valve assembly is an analog valve, and in that the analog valve and the hydraulic pump are adapted to be actuated by a control device in such a manner that the brake pressure for comfort braking can be increased or decreased in an essentially continuously variable manner.

Abstract: The present invention relates to an ABS solenoid valve. The ABS solenoid valve comprises: a housing coupled within a modulator block; a receiving unit disposed within the housing; a plunger mounted on the receiving unit and having a projection in one end; a compressive spring coupled with the plunger adjacent to the projection; a valve seat supported by the compressive spring and received within the housing; a coupling channel disposed within the valve seat; an orifice communicating with the coupling channel of the valve seat and coupling with a side of the housing; a flow path disposed within the orifice; a channel pipe communicating with the flow path, a flow groove disposed in an outer periphery of the valve seat; and a discharge port disposed in the housing and the orifice and communicating with the flow groove of the valve seat. The channel grooves are disposed in the outer periphery of the valve seat to simplify a fabricating process.

Abstract: An anti-locking brake system for a land vehicle, which is set up in particular for traction control and vehicle dynamics control, comprises a pump (42) for actuating a wheel brake (37) which removes brake fluid from a brake pressure generating unit (31) and supplies it to the wheel brake (37), wherein a first valve arrangement (1) blocks in a non-actuated (normal) position (1.1) the connection between the brake pressure generating unit (31) and an input connection (42e) of the pump (42) and in at least one actuated position (1.3) establishes a primary flow connection (A), a first electromagnetic valve (50) establishes in a non-actuated position (50.1) the connection between an output connection (42a) of the pump (42) and the brake pressure generating unit (31), and blocks it in an actuated position (50.

Abstract: A control circuit for a controllable electric solenoid valve of a brake system of a motor vehicle is described, in which the actual values of a controlled variable (f(t)), e.g., the vehicle deceleration, a wheel slip, a driving speed, an angle of rotation or the like are returned to a predetermined tolerance band. The actual value of the controlled variable is measured continuously and compared with the predetermined tolerance band, which is stored in an EEPROM, for example. If the actual value of the controlled variable leaves the predetermined tolerance band (22), a correction device (15) intervenes and returns the actual value to the predetermined tolerance band by increasing or decreasing the trigger current for the solenoid valve (1).

Abstract: A device for mounting the coil assemblies of solenoid valves in the ECU's housing of an electronically controlled brake system for automobiles is disclosed. When mounting a coil assembly in the ECU's housing using the mounting device of this invention, the coil assembly is received in a cylindrical holder formed at the bottom wall of the ECU's housing. In such a case, two bosses formed on the bobbin of the coil assembly pass through two holes formed at the bottom wall of the ECU's housing, and one of the two bosses is plastically deformed at its lower end projecting outside an associated hole, thus forming a stopper preventing an undesired removal of the coil assembly from the housing. Due to the mounting device of this invention, it is possible to improve work efficiency while mounting the coil assemblies of solenoid valves in the ECU's housing, and so the production cost of the brake systems is reduced.

Abstract: The invention relates to an electromagnetic device, in particular for a slip-controlled, hydraulic vehicle brake system, having at least a first magnet valve which is closed in its currentless basic position and having at least a second magnet valve which is open in its currentless basic position, the first and second magnet valves being received in receiving bores of a valve block. The invention provides that the first and second magnet valves have structurally identical, one-piece valve housings, in each of which all the magnet valve components are received essentially without any axial protrusion, and that the total length of each of the first and second magnet valves is recessed in the receiving bores of the valve block, and that a nonferromagnetic spacer ring is disposed between a face end, pointing toward the valve seat, of at least one magnet coil and a dividing plane between this magnet coil and the associated pole piece.

Abstract: A solenoid valve for brake systems is disclosed. This solenoid valve is preferably used as an outflow control NC-type solenoid valve mounted on the oil return line of an electro-hydraulic brake system (EHB). This solenoid valve comprises a hollow valve housing having a radial inlet passage, a plunger movably received in the bore of the valve housing so as to axially move in the bore in opposite directions, and a valve seat set in the bore of the valve housing, with an orifice axially formed in the valve seat such that the orifice is opened or closed by a control ball of the plunger. A radial oil port is formed on the sidewall of the valve seat so as to allow oil from the oil inlet passage of the valve housing to flow into the valve seat, and flow from the valve seat toward the plunger through the orifice.

Abstract: A modulator relay valve assembly for selectively controlling brake application to an associated brake chamber is provided. The modulator relay valve assembly comprises a housing having a supply port, a delivery port, a control port, and an exhaust port. A piston is received in the housing defining a control volume in communication with the control port and is movable to control communication among the supply, delivery, and exhaust ports. A quick release valve with a direct passage to atmosphere communicates with the control volume, allowing contaminants to be expelled form the control volume during service and ABS braking. The quick release valve is biased toward an open position allowing communication from a control volume to atmosphere during service brake and ABS brake applications to decrease a pressure exerted by the control volume on the piston.

Abstract: An assembly (20) is used with an anti-lock braking system (10). The assembly (20) includes electronic circuitry (30) for the anti-lock braking system (10), a plurality of solenoid coil devices (70) for the anti-lock braking system (10), and a serial drive component (101). The serial drive component (101) electrically interconnects the electronic circuitry (30) and the plurality of solenoid coil devices (70). The serial drive component (101) takes input from a first number of interconnection points of the plurality of solenoid coil devices (70) and providing output to a second number of interconnection points of the electronic circuitry (30). The first number is greater than the second number.

Abstract: An electromagnetically driving part for use in opening/closing a valve or the like, comprises a guide cylinder 17 in which a movable core 18 is received slidably, and a fixed core 15 fixed to the guide cylinder 17. The fixed core 15 and the guide cylinder 17 are coupled with each other by welding in a state that the guide cylinder 17 is press-fitted onto the fixed core 15. An air gap 16a is formed between an outer circumferential surface of the fixed core 15 and an inner circumferential surface of the guide cylinder 17. The fixed core 15 and the guide cylinder 17 are welded with each other in a portion where the air gap 16a is formed. Accordingly, it is possible to weld a guide cylinder and a fixed core with each other surely, and to miniaturize an electromagnetically driving part.

Abstract: In a system for controlling a brake valve, the supply voltage available for controlling the electromagnet of the brake valve is continually measured during operation and the effective value of the voltage present at the coil of the electromagnet is varied by varying the duty factor of the pulse times according to the supply voltage supplied at the time.

Abstract: Disclosed herein is a solenoid valve for brake systems. The solenoid valve includes a spool movably set in a valve housing, provided along its central axis with the first orifice which has a predetermined diameter, and provided at a position around the plunger with a plunger guide having a predetermined depth for allowing the plunger to enter the spool, thus opening and closing the first orifice. A valve seat portion is formed on the inner surface of the bore of the valve housing by stepping the surface. This valve seat portion defines the second orifice therein, and comes into contact with or spaced from the end of the spool to selectively open the outlet, separately from the first orifice when the spool moves in either direction. The second orifice has an inner diameter larger than that of the first orifice. A spool restoring spring normally biases the spool toward the plunger.

Abstract: The present invention relates to a pressure control valve including a valve housing which houses a valve seat in a housing opening, a valve closure member which is movable into abutment on the valve seat and adapted to interconnect or isolate pressure fluid channels connected to the valve seat, a bore in a guide element for the accommodation of the valve closure member which is axially movably supported on the wall of the valve housing. The valve closure member is attached in the guide element by way of a simplified press fit in conformity with the demands of automation. The assembly of the valve coil is simplified in addition.