Valve device adaptable for brake control of a variety of pressure medium-operated vehicle brake systems

A valve device for brake control of a different pressure medium-operated vehicle brake systems comprises a housing that has pressure medium ducts. A relay valve provides a pneumatic control pressure, which is fed to the relay valve via at least one of the pressure medium ducts at a higher flow rate. At least one insert is pneumatically connected to at least two of the pressure medium ducts, which can be pneumatically connected to each other by the insert. The two pressure medium ducts define a pressure medium path, the profile of which differs based on the housing that is in each case selected and/or switched based on the selected insert. The housing is selected from a set of housings having different pressure medium ducts, in particular bores, but which are otherwise essentially similar. The insert is selected from a set of different inserts.

FIELD OF THE INVENTION

The present invention generally relates to a valve device for brake control of a pressure-medium-operated brake system of a vehicle.

BACKGROUND OF THE INVENTION

Pressure-medium-operated brake systems are used in particular for utility vehicles. Here, compressed air is preferably used as the pressure medium. For the actuation of a service brake of the vehicle or for the release of a parking brake of the vehicle, a control pressure is modulated by electropneumatic and/or pneumatic means and is provided at a boosted air flow rate, or at a higher pressure medium flow rate, by means of a relay valve. Here, the relay valve is part of the valve device and is preferably arranged in a housing of the valve device.

From the relay valve, the pressure medium with boosted pressure medium flow rate is conducted to at least one brake cylinder in order to brake at least one wheel of the vehicle or is conducted to a spring store part of a combined spring brake cylinder in order to release a parking brake at at least one wheel of the vehicle.

Various valve devices are known for different brake systems. In particular, a valve device is known to which the control pressure is supplied externally at an inlet. The control pressure is in this case modulated purely pneumatically by means of a foot-operated brake pedal.

Another known valve device uses such a brake pressure modulated by means of a foot-operated brake pedal as a redundancy pressure, and conducts the redundancy pressure to the relay valve as a control pressure in the event of an electronics failure. The known valve device furthermore has a plurality of electromagnetic valves by means of which the control pressure is modulated during normal operation.

The known valve devices, which are configured differently depending on the brake system used, may have different valves and different housings with different pressure medium ducts. In particular, the known valve devices are designed differently as a relay modulator for an electropneumatic parking brake, as a relay modulator for an electronically regulated brake system, as a relay modulator for a pneumatic brake system with anti-lock function and/or traction control, as an electromagnetic relay valve or as a relay valve. Of these different configurations, in each case different variants for different applications and/or functions are also known.

For the known valve devices, it is necessary for brackets intended specifically for the respective valve device to be provided on the vehicle. This makes it complex and expensive to equip vehicles with different brake systems. Furthermore, it is necessary to produce a multiplicity of different housings, which leads to low unit quantities and consequently high costs of production of the known valve devices.

DE 10 2008 048 562 A1 discloses a valve arrangement, without relay valve, having a plurality of valve devices for brake control of a pneumatic brake system of a vehicle, in particular a rail vehicle. The valve devices of the valve arrangement are formed as block-like support modules with identical height and depth dimensions. The valve devices are connected to one another and have bores which, together, form longitudinal ducts extending through the valve device. Furthermore, the valve devices have a standard bore for receiving in each case one cartridge valve. Different control valves for different valve functions are provided as cartridge valves. For adaptation to the different valve functions, a duct guide in the valve device is adapted by inserting plug elements into pressure medium ducts to be shut off. In the known valve devices, it is necessary, in a cumbersome manner, for plug elements to be positioned precisely and such that they remain permanently in position. An intended mode of operation of the respective valve device, such as is desired or necessary in the case of the abovementioned valve devices for utility vehicles, would otherwise be impaired. It would therefore appear to be disadvantageous for an air guide or pressure medium guide which can be varied by means of plug elements to be provided in the case of the abovementioned valve devices with relay valve.

SUMMARY OF THE INVENTION

Generally speaking, it is an object of the present invention to provide an improved valve device with relay valve for brake control of the vehicle brake system—e.g., for braking or immobilizing the vehicle by means of pressure-medium-operated brake cylinders, and a brake system having the valve device and also a vehicle having the valve device.

The valve device according to the invention is provided for brake control of a pressure-medium operated brake system of a vehicle. The valve device has a housing, which in turn has a plurality of pressure medium ducts. The pressure medium ducts are in particular bores in the housing. In the pressure medium ducts there is situated a pressure medium, preferably air, which can be conducted through the pressure medium ducts. In devices that are pneumatically connected to the same pressure medium duct, an identical pressure is assumed at least after a finite period of time. The pressure medium ducts thus serve for pressure transmission, ventilation and/or aeration. The valve device furthermore has a relay valve that provides a pneumatic control pressure, which is supplied to the relay valve through at least one of the pressure medium ducts, at a higher pressure medium flow rate.

Furthermore, the valve device has at least one insert, for example a valve block, which is pneumatically connected to two or more of the pressure medium ducts. The pressure medium can thus flow from a pressure medium duct through the insert to a second pressure medium duct, such that the two pressure medium ducts are or can be pneumatically connected to one another through the insert or through the valve block. Here, two pressure medium ducts are considered to be pneumatically connected to one another if the same pressure is assumed in the two pressure medium ducts after a finite time.

The arrangement of the two pressure medium ducts, which are or can be connected to one another, including the pneumatic connection of the two pressure medium ducts through the insert, is referred to in the present description as the pressure medium path. Here, the pressure medium path may if appropriate have further pressure medium ducts, or other pressure medium devices, pneumatically connected to at least one of the two pressure medium ducts. At least the two pressure medium ducts that are or can be connected to one another, and the pneumatic connection or connection facility thereof through the insert, thus together define the pressure medium path. The valve device may have one or more of such pressure medium paths.

Two housings of an identical housing type, in which at least one of the two pressure medium ducts is arranged differently in relation to the corresponding pressure medium duct of the other housing, thus have different pressure medium paths, for example. Different pressure medium paths may also be provided if the insert or the valve block for example pneumatically connects a first to a second pressure medium duct in a first valve device but pneumatically connects the first to a third pressure medium duct in a second valve device. The third or second pressure medium duct that does not belong to the pressure medium path in the respective case may in each case be omitted, have a different function or be unused.

The inventive valve device has, in relation to other valve devices with a different function, a housing of an identical housing type or an identical or substantially identical housing, which can thus be produced inexpensively in large unit quantities for all of the valve devices. In particular, the same casting mold or a substantially identical casting mold may be used for casting the housing. Pressure medium ducts, in particular drilled holes, which are formed into the respective housing after the casting process may likewise be substantially identical or may differ by the different valve devices. Here, housings with different pressure medium ducts and/or with different housing covers are regarded as being substantially identical if they are otherwise identical or differ only insignificantly. In particular, housings of the same housing type are considered to be substantially identical regardless of their drilled holes and regardless of the configuration of the housing cover.

The object of the invention is furthermore achieved in that, for a respectively desired function of the respective valve device, either a housing with pressure medium ducts specifically for the function is provided, wherein the insert may be one that is substantially identical or different in relation to the valve devices with identical housing but different function. Alternatively, the housing has a plurality of pressure medium ducts for different functions, which pressure medium ducts are used depending on the desired function, wherein the respectively selected insert determines which pressure medium ducts are actually used and how the pressure medium ducts are used.

In detail, therefore, on the basis of a respectively selected housing selected from a set of a plurality of housings that have different pressure medium ducts, in particular bores, but which are otherwise identical or substantially identical, the pressure medium path runs differently depending on the respectively selected housing.

Alternatively or in addition, on the basis of a respectively selected insert selected from a set of a plurality of different inserts, the pressure medium path is or can be connected differently depending on the respectively selected insert.

In particular, the pressure medium path has different pressure medium ducts for different inserts. In one particular embodiment, the pressure medium path has the pressure medium duct that conducts the control pressure.

It will be appreciated that the present invention provides a valve device that can be used for a multiplicity of different brake systems. Here, the valve device has a high number of standardized components. With comprehensive standardization, therefore, it is necessary merely for different pressure medium ducts or bores to be formed into the housing and/or for different inserts to be used in order to use the valve device in different brake systems. If appropriate, the housings are provided with different covers. It is however alternatively also possible for identical or substantially identical covers to be used that have identical or different bores.

It is preferable for at least one of the pressure medium ducts, in particular in the case of the selected insert, to be assigned in each case one function from the group “aeration”, “ventilation”, “conduct control pressure or redundancy pressure”, “conduct brake pressure”, and “not used”. Here, the respective pressure medium duct is preferably assigned a different function from the group in each case in relation to a selection of a different insert from the set of inserts owing to the design of the actually selected insert, which is different from the design of the other insert. Identical pressure medium ducts or bores may be assigned different functions by means of the insert. In particular, the pressure medium duct that conducts the control pressure may thus for example either be charged with pneumatically modulated pressure through the insert or aerated with compressed air from a compressed-air reservoir or ventilated to a vent device.

The pressure medium path preferably comprises at least one pressure medium duct that is an internal duct. An internal duct is a pressure medium duct that pneumatically connects port connections to the insert and/or further pressure medium ducts of the valve device to one another. Here, the pressure medium path comprises at least a different internal duct in the case of the selected housing in relation to the selection of a different housing from the set of housings and/or in the case of the selected insert in relation to the selection of a different insert from the set of inserts.

A pressure medium duct used with one insert is thus not provided in the respective other insert or is not used with the respective other insert. Depending on the selection of the insert, it is for example possible for a first pressure medium duct to be pneumatically connected, or made pneumatically connectable, either to a second or to a third pressure medium duct. The pressure medium is thus conducted via different pressure medium ducts in the housing of the valve device for different configurations of the valve device. Pressure medium ducts that are not required may be omitted or may alternatively nevertheless be provided in the valve device. It may however also be the case that pressure medium ducts are used differently in some configurations of the valve device or for use in some brake systems. For example, the same pressure medium duct may conduct the control pressure in the case of the selected insert, whereas the pressure medium duct conducts for example the reservoir air pressure to the vent in the case of a different insert. The housing may thus have identical pressure medium ducts, in particular in the form of identical drilled holes, for each insert or for a group of inserts.

In a further embodiment of the invention, the pressure medium ducts alternatively or additionally comprise a plurality of port ducts that lead to ports on the housing. Here, the pressure medium path comprises at least two of the port ducts, wherein the pressure medium path comprises at least one different port duct, or the function of at least two port ducts comprised by the pressure medium path are interchanged with one another, in the case of the selected housing in relation to the selection of a different housing from the set of housings and/or in the case of the selected insert in relation to the selection of a different insert from the set of inserts. It may thus be provided, for example, that a pressure medium duct that serves for aeration with a reservoir air pressure serves, in a different insert, to provide the brake pressure with boosted air flow rate from the relay valve to the connection to the brake cylinder, and/or vice versa.

The housing preferably comprises a housing block and a housing cover. The relay valve is advantageously arranged in the housing block. The housing block advantageously also comprises at least two port ducts. Pressure medium lines or pressure medium pipes for connecting to further pneumatic components of the brake system can be connected to the ports.

The housing block is advantageously of identical or at least substantially identical design independently of the selection of the housing in relation to the selection of preferably any other housing from the set of housings and/or independently of the selected insert in relation to the selection of preferably any other insert from the set of inserts. Here, two housing blocks are considered to be identical if they have identical or different pressure medium ducts but otherwise no significant differences, in particular originate from the same or an identical casting mold. In particular, the housing block has identical mechanical fastening points in the case of each of the housings and/or in the case of each of the inserts. It is thus possible for the valve device to be fastened to brackets on the vehicle in the same way independently of the selection of the insert and/or independently of the selected brake system.

Alternatively or in addition, the ports on the housing or pneumatic interfaces on the housing are formed in the same way, and in an advantageous refinement also arranged in the same way, independently of the selected housing from the set of housings and/or independently of the selected insert. Ideally, an identical or substantially identical housing block is provided for the valve devices having identical or differently selected inserts. It is however also alternatively possible, for example, for two different housing blocks to be provided for two groups of valve devices. For example, an identical housing block may be provided for different valve devices formed as modulators with electromagnetic valves, and a different housing block may be provided for different valve devices formed as relay valves.

The housing covers may be of either identical or different design for the valve devices with different housings and/or with different inserts. It may for example be advantageous, despite resulting lower unit quantities in which identical housing covers must be produced, to produce a plurality of different housing covers, because for example the production of a cover for a valve device formed as a relay valve may be less expensive, owing to simpler technical configuration, than the production of additional covers that can also be used for a valve device formed as a modulator.

The insert is preferably surrounded by the housing block and by the housing cover and clamped to the housing. In this way, it is possible, for example, for the cover to be screwed to the housing block so as to surround the insert, such that when the housing cover is screwed on, pneumatic connections are simultaneously produced between the housing and the insert, and the insert is fixedly fastened to the housing. An exchange of the insert, for example for the repair of the valve device in the event of a defect in the insert, can thus be performed easily by simply unscrewing the cover, exchanging the insert and subsequently screwing the cover onto the housing block again. The cover is a replacement part that can be repaired in a workshop.

A conversion of the valve device for a different brake system is also easily possible in this way, by merely exchanging the insert for a different insert from the set of inserts. If appropriate, it is additionally necessary for port lines to be connected to different ports on the housing. An exchange of the complete valve device is however not necessary. When the insert is exchanged, the housing cover must additionally be exchanged if appropriate. Two housings that have housing blocks of identical design but housing covers of different design are considered to be of substantially identical design. In particular, the housing block preferably makes up a significant proportion of the housing, or makes up a greater proportion of the housing than the housing cover.

In a preferred embodiment of the invention, the insert is a valve cartridge or a valve block. Here, the insert has at least one valve. In particular, the valve cartridge has one valve, whereas the valve block preferably has a plurality of valves, for example three valves. The valves are preferably electromagnetic valves. The pressure medium path can be opened up or blocked by means of the valve.

Alternatively or in addition, there may be provided in the valve device an insert that is a valve replacement body or connecting body that has at least one connecting duct and that connects pressure medium ducts permanently to one another. The insert is in this case a type of distributor station by means of which for example pressure medium ducts that lead to ports on the housing and pressure medium ducts that lead to valves are pneumatically connected to one another depending on the desired function and/or the valve that is used, such that ports on the housing may have identical functionality despite internally differently used pressure medium ducts, or may be used with identical pressure medium lines, for example to the compressed-air reservoir or to the brake cylinder.

If appropriate, a valve replacement body of this type may be provided in a valve block instead of a valve and thus, as a dummy body, fill out a chamber provided for receiving a valve and simultaneously perform connecting functions for the permanent connection of pressure medium ducts.

In one embodiment, the insert has a hardened injection-molded compound or cast compound or is composed of the injection-molded compound or the cast compound. The injection-molded compound or cast compound is in particular a plastic injection-molded compound or plastic cast compound. Here, the injection-molded compound or cast compound at least partially surrounds the insert or the valve. Different components of the valve can be inexpensively and permanently connected to one another and fixed relative to one another in this way. A valve replacement body or connecting body that may be provided may also have such an injection-molded compound or cast compound or a different injection-molded compound or cast compound. It is for example possible for cavities in a magnetic valve block, which cavities are provided for receiving valves, to be filled out with such an injection-molded compound or cast compound. Connecting ducts that may be required may be left free during the injection molding or casting or may be formed retroactively into the hardened injection-molded compound or cast compound. A plug connector is advantageously also already injection-molded onto the insert.

In one embodiment, the respective insert used in the valve device preferably differs from at least one other, in particular third, insert of the set of inserts in that it has at least one identical valve but has at least one different connecting duct, in particular bore, in the insert. In this way, it is duly possible for at least partially identical valves to be used in the valve block. Different functionality can however be attained by means of different pressure medium guidance or by means of different bores in the valve block. By contrast, the design of the housing block of the valve device remains identical.

In another embodiment of the invention, the insert differs from at least one other, in particular third, insert of the set of inserts in that it has two identical connecting ducts, in particular bores, in the insert or in the valve block but has at least one different valve. Here, different functionality is made possible simply through the use of different valves. If appropriate, different functionality is attained by virtue of a dummy body or valve replacement body being inserted instead of a valve, or a cavity intended for receiving a valve being filled out with a plastic and permanently forming a connecting duct.

The valve device is preferably a device from a group of devices, in particular with housings of the same housing type, wherein the group comprises a relay modulator device for an electropneumatic parking brake. The group also has a relay modulator device for an electronically regulated brake system, a relay modulator device for a pneumatic brake system with or without traction control, an electromagnetic relay valve device, and a relay valve device of simple design. The valve device is selected from the group as a function of the respective housing and/or as a function of the respective insert. In particular, the selected housing and/or the selected insert determines which device from the group the valve device can be used as. Two different valve devices from the group therefore differ merely by different housings, in particular by different pressure medium guidance in the housing of the same housing type, and/or by different inserts, in particular valve blocks. The group of devices may if appropriate have fewer devices than those mentioned. The group however comprises at least two of the devices, such that the valve device is one of the at least two devices depending on the selected housing and/or depending on the selected insert. The group however preferably comprises at least three, very preferably at least four, of the stated devices.

The housing preferably has ports for connecting to a compressed-air reservoir, to a vent, to a control pressure or redundancy pressure and to at least one brake cylinder. The ports are connected to the port ducts, such that the compressed air that is preferably used as the pressure medium can be conducted to the ports and drawn via the ports.

The housing of the valve device preferably is formed predominantly from a light metal. It is particularly preferable for the housing to comprise aluminum, or to be an aluminum pressure die cast body. The pressure medium ducts are preferably formed at least partially by bores in the housing.

The present invention accordingly embodies the features of construction, combinations of elements, and arrangement of parts, all as exemplified in the detailed disclosure hereinafter set forth, and the scope of the invention will be indicated in the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

FIG. 1shows a valve device1for a compressed-air-operated brake system of a utility vehicle. Brakes of the vehicle can be actuated by means of the valve device1. The valve device1has an insert2formed as a valve block. Owing to the selected insert2, the valve device1is a relay modulator device for an electronically regulated brake system. With alternatively selectable inserts2′ and2″, which are likewise formed as valve blocks, the valve device1would, by contrast, be a relay modulator device for a pneumatic brake system or a relay modulator device for an electropneumatic parking brake. Here, the inserts2,2′ and2″ are externally of identical design, or are of identical external appearance, but have different air guides and/or different valves in the interior. Internal pneumatic ports4of the insert2′ are however identical to internal pneumatic ports4′ of the insert2″ and to internal pneumatic ports (not shown) of the insert2. Furthermore, the inserts2,2′ and2″ have identical electrical terminals or interfaces6,6′ and6″. Identical electrical terminals6,6′ and6″ means mechanically identical or compatible plug connector shrouds or plug connector shanks that can be placed in contact with identical or compatible plug connectors or couplings, wherein different electrical contacts and/or a different number of electrical contacts may however be produced if appropriate. In particular, pin assignments of the electrical terminals6,6′ and6″ may differ from one another. For example, for a different number of valves to be electrically actuated, a different number of electrical contacts is required, which electrical contacts are realized in accordance with the demands in the electrical terminals6,6′ and6″ or in the plug connectors.

The insert2is fastened to a housing8of the valve device1. The housing8includes a housing block10and a housing cover12, which is fastened to the housing block10for example by means of screws14,14′,14″ and a further screw which is obscured. The insert or valve block2is clamped between the housing block10and the housing cover12. Here, pneumatic connections to corresponding internal pneumatic ports on the housing block10and/or on the housing cover12are produced via the internal pneumatic ports of the insert2.

The valve device1is, owing to the housing8, too, a relay modulator device for an electronically regulated brake system. A different function of the valve device1may be attained by means of an alternatively selectable insert2and/or by means of an alternatively selectable housing8.

The housing block10has pneumatic ports16and16′ and, if appropriate, further pneumatic ports that are pneumatically connected to port ducts in the housing block10.

FIG. 2is an exploded view of a valve device1′, which is in the form of an electromagnetic relay valve device. Here, the difference between the valve device1′ and the valve device1ofFIG. 1emerges substantially from the selection of an insert2′″, which differs from the insert2. The valve device1′ otherwise has a housing substantially identical to the housing8of the valve device1. In particular, the valve device1′ also has the housing block10with identical pressure medium ducts. It would however alternatively also be possible for fewer, more and/or different pressure medium ducts to be provided in the housing block10, with the function of the valve device1′ being dependent on the pressure medium ducts.

Instead of the housing cover12, there is provided in the valve device1′ a housing cover12′, which is of simplified form in relation to the housing cover12, in particular because the insert2′″ is also of simplified form in relation to the inserts2,2′ and2″ ofFIG. 1and, in the exemplary embodiment shown, has only one internal pneumatic port to the housing cover12′ and three further pneumatic ports to the housing block10. An electrical terminal6′ is also provided. By contrast, in the case of an alternatively selectable insert2″, which is likewise in the form of a valve cartridge and which can be inserted instead of the insert2′″ between the housing block10and the housing cover12′, an electrical terminal is not required. With the insert2″, the valve device1is a purely pneumatic relay valve device.

A relay valve17is arranged substantially in the housing block10. The housing block10also has internal pneumatic interfaces18for connecting to the insert2′″ or to a different insert. A pneumatic connection between the housing block10and the housing cover12′ is realized by means of a pneumatic interface20. Here, pneumatic connections via pneumatic interfaces or ports may be produced by means of correspondingly arranged drilled holes, and sealing may be realized by a seal, for example an O ring, arranged in the transition region.

FIGS. 3, 5 and 6are exemplary circuit diagrams of the valve device1ofFIG. 1with the insert2, of a valve device1″ with the insert2′ ofFIG. 1, and of a valve device1′ with the insert2″ ofFIG. 1, in each case in conjunction with further components of a brake system. Despite the reference to the valve device1, the following description also refers to the valve devices1″ and1′″, because these all have substantially identical housings8and8′.

In particular, the housing8has the housing block10and the housing cover12. The insert2is arranged between the housing block10and the housing cover12and has internal pneumatic interfaces22,24,26,28,30,32and34to the housing cover12and further internal pneumatic interfaces36,38and40to the housing block10. The valve device1is connected via the pneumatic port16and a compressed-air line42to a compressed-air reservoir vessel44and can thus be supplied with compressed air from a compressed-air reservoir. The valve device1is furthermore connected via the pneumatic port16′ and via a compressed-air line46to at least one brake cylinder48, such that a vehicle can be braked by means of the brake cylinder48.

Via a further pneumatic port16″ and a compressed-air line50, the valve device1can be ventilated to a vent52. If appropriate, the vent52may also be integrated directly into the valve device1or flange-mounted on the valve device1. Finally, a further pneumatic port16′ is provided on the housing8of the valve device1for connecting to a brake pedal device54via a compressed-air line56.

The housing8preferably has pressure medium ducts realized as bores. As regards the pressure medium ducts, a distinction will hereinafter be made between port ducts and internal ducts. Port ducts58,60,62and64are pressure medium ducts that lead to the pneumatic ports16to16′″ on the housing8. Further pressure medium ducts are internal ducts66,68,70and72, which, in this case, are arranged in the housing cover12. The valve device1also has, in particular in the housing block10, further pressure medium ducts or internal ducts73,74and75.

A brake pressure is electropneumatically modulated by means of the valve block2and provided via the internal pneumatic interface40and the pressure medium duct74to the relay valve17. By means of the relay valve17, the air pressure prevailing in the pressure medium duct74is provided, at a higher air flow rate, via the port duct64. For this purpose, the relay valve draws compressed air via the pressure medium duct73or ventilates the port duct64to the vent52via the pressure medium duct75.

For exemplary illustration of a further possible air guidance configuration in the exemplary embodiment shown, a redundancy pressure is provided to the valve block4via the port duct58in the housing block10, and onward via the pneumatic interface20, via the internal duct66and finally via the internal pneumatic interface22. In the event of an electronics failure or power failure, or deenergized valves, the redundancy pressure is transmitted through to the relay valve17.

In this respect, the valve device1ofFIG. 3equates to the valve device1″ shown inFIG. 4and to the valve device1′ shown inFIG. 5. Differences between the valve device1and the valve devices1″ and1′″ emerge from the different selected inserts or valve blocks2and2′ or2″ respectively. It is possible for different pressure medium paths to be connected by means of the different inserts2and2′ or2″, respectively.

In the valve device1ofFIG. 3, a pressure medium path is connected that comprises the port duct58, the internal duct66and the internal duct74. Between the internal pneumatic interfaces22and24, the pressure medium path includes a connecting duct76, an electromagnetic valve78, a connecting duct80and a connecting duct82. Further pressure medium paths are provided, for example for the electropneumatic increase of an air pressure to be modulated, through the port duct60, a connecting duct84, the internal duct72, a connecting duct86, the connecting duct82and the internal duct74. To produce the pneumatic connection or the connected pressure medium path, it is necessary merely for the electromagnetic valve88to be energized.

A ventilation, or reduction of a modulated pressure, may take place, in the event of an energization of an electromagnetic valve90, via a further pressure medium path that includes the port duct62, a connecting duct92, the internal duct68, a connecting duct94, the electromagnetic valve90, a connecting duct96, the connecting duct80, the connecting duct82and the internal duct74.

In conjunction with the valve block2, the internal duct70is not used. The internal pneumatic interfaces26and28and/or ports or blind holes adjoining them may also be omitted if appropriate. In alternative exemplary embodiments, the internal duct70, which is not required, may also be omitted. Furthermore, the existing pressure medium ducts, in particular the connecting ducts, may also be guided differently and for example also connect other pneumatic interfaces to one another or be connected to other pneumatic interfaces.

FIG. 4shows the valve device1″ with the insert2′, which is selected to be different to that in the valve device1ofFIG. 3. The insert or valve block2′ has, like the valve block2, the electromagnetic valve78. By contrast to the valve block2, however, the valve block2′ has electromagnetic valves98and100instead of the electromagnetic valves88and90. Furthermore, the valve block2′ has an air guidance configuration that differs from that of the valve block2. Owing to the different valve device2, or owing to the changed air guidance configuration, the connectable or connected air paths of the valve device1″ are changed in relation to the air paths of the valve device1. In particular, it is for example the case that an air path that conducts a setpoint brake pressure pneumatically modulated by the brake pedal device54, as a redundancy pressure, to the relay valve17has not only the port duct58, the internal duct66, the internal duct76, the electromagnetic valve78and the internal duct74, but also a connecting duct102, a path through the electromagnetic valve100, a connecting duct104, the internal line70, a connecting duct106, a path through the electromagnetic valve98, and a connecting duct108. Therefore, owing to the design of the valve block2′, the internal duct70is used as part of an air path; whereas, if the valve block2is selected, the internal duct70is unused, and different air paths have the internal ducts68and72, respectively. Furthermore, the valve block2′ has connecting ducts110and112.

The valve devices1and1″ differ, owing to the different selected valve blocks2and2′, by a different functionality, in particular in the event of an electronics failure, power failure or failure of at least one of the electromagnetic valves78,88,90,98,100. For the different functionality, it is necessary merely to select a valve block2to2″″ provided for this purpose, whereas for example the housing8may remain the same. The housing8can thus be produced inexpensively in large unit quantities. The housing8may be one of numerous housings of an identical housing type, wherein all of the housings8of the housing type have substantially identical features, in particular originate from the same casting mold or an identical casting mold. The pressure medium ducts or drilled holes of the housings8of identical housing type may however be arranged differently, and thus be adapted to the respectively desired function of the valve device1that has the respective housing8.

FIG. 5shows the valve device1′″, which substantially equates to the valve device1″ ofFIG. 4. In particular, the housing8is again provided in the valve device1′″. Even the valve block2″ substantially equates to the valve block2′ ofFIG. 4. In particular, an identical air guidance configuration to that in the valve block2′ is provided, in particular owing to identical bores, in the valve block2″. In the valve block2″, however, instead of the electromagnetic valves98and100of the valve block2′ ofFIG. 4, dummy bodies114and115are provided that provide a permanent connection between the connecting ducts102and104and between the connecting ducts106and108, respectively, and which otherwise fill out a remaining empty space. The dummy bodies114,116may, after being produced, be inserted into the valve block2″ instead of electromagnetic valves98,100. Alternatively, the dummy bodies114,116may however also be produced by virtue of cavities suitable for receiving the electromagnetic valves98and90being filled out by casting, or filled out by injection molding, with an injection-molded compound or cast compound, wherein the abovementioned connecting paths are left free for example as a result of the prior insertion of tubes.

FIG. 6shows a circuit diagram of the valve device1′ ofFIG. 2with the simplified housing cover12′ and the cartridge valve2″″ which has the electromagnetic valve78but no further valves. The housing block10is however of identical design to the housing blocks10of the valve devices according toFIGS. 3, 4 and 5. In terms of its function, the valve device1′ is identical to the valve device1′ ofFIG. 5. The housing cover12′ is of simpler construction than the housing cover12, and in particular has only one internal duct118instead of the internal ducts66,68,70and72. The insert or the valve cartridge2″ has pressure medium ducts120,122and124as connections in a housing8′ of the valve device1′, and the electromagnetic valve78. The valve cartridge2″ is thus likewise of simpler construction, and can be produced less expensively, than the valve block2″. In exceptional cases, it may therefore be expedient for individual inserts or subgroups of inserts to be formed differently at least externally, whereas in general, a plurality of inserts of the group of inserts are preferably of identical external design, in particular in terms of their dimensions. It may likewise be advantageous in individual cases for housing covers12′ of different form to be provided instead of the housing cover12, wherein, however, the housing8′ substantially equates overall to the housing8, for example because an identical housing block10is used. On the housing block10there are preferably provided mechanical interfaces for fastening to a vehicle frame. It is thus possible, independently of the selection of the respective insert2,2′,2″ or2″, for the valve device1or1″,1′″ or1″″ to be fastened to the vehicle frame without the need to provide different adapters or other holding apparatuses for this purpose. Even if the housing8or the housing block10is selected from a set of substantially identical housings or housing blocks with different pressure medium ducts, the mechanical interfaces are preferably identical, such that the valve device1or1″,1′ or1″″ can be fastened to the vehicle frame independently of the respectively selected housing8.

FIG. 7shows a brake system130according to an exemplary embodiment of the invention having the valve device1ofFIG. 1. The valve device1has the insert2, such that the brake system130is designed as an EBS brake system or as an electronically regulated brake system, wherein the brake pressure is electropneumatically modulated in accordance with a deceleration demand signal.

The valve device1is thus formed as a 1-channel axle modulator and is provided for actuating brakes132and134on a front axle136of a vehicle that has the brake system130. Further valve devices1are provided as wheel modulators in each case for a brake138and140, respectively, on a rear axle142of the vehicle, and are combined in a 2-channel axle modulator143. Furthermore, the brake system130has a brake actuating device54with a brake transducer, has a trailer control valve device146, and has a device for control148formed as a control unit. The device for control148performs central control functions of the electronic brake system, such that it simultaneously forms a central controller of the electronic brake system.

The brake system130is constructed with three brake circuits that are fed from three compressed-air reservoir vessels150,152and154and that, in turn, receive compressed air from at least one compressor (not illustrated), preferably after treatment in a compressed-air treatment device, and preferably via a four-circuit protection valve. It is primarily possible for the brakes132and134at the front axle136to be actuated by means of the first brake circuit and for the brakes138and140at the rear axle142of the vehicle, and brakes (not illustrated) of an attached trailer, to be actuated by means of the second brake circuit. A third brake circuit, which is fed from the compressed-air reservoir vessel154, is provided for operating, in particular releasing, a parking brake.

Compressed air from the compressed-air reservoir vessels150and152is provided to the brake pedal device54via compressed-air lines156and158and also160and162, respectively. In response to an actuation of the brake pedal of the brake pedal device54, the brake pedal device54or the brake transducer generates an electrical brake demand signal that is transmitted via an electrical interface to an electrical line164and via the electrical line164and via an electrical interface to the device for control148. Furthermore, the brake actuating device54directly modulates a redundancy pressure for the two brake circuits and provides the redundancy pressure via two of its pneumatic interfaces.

The control device148is electrically connected via electrical lines166,168and170, respectively, to the valve devices and modulators1and to the trailer control valve146. The control device148can thus perform control functions and, in conjunction with sensors, perform regulating functions for those components of the brake system130that it actuates and/or for the valve device1and for the trailer control valve device146.

In response to the braking demand signal, the control device148actuates the valve devices1such that the valve devices1modulate a brake pressure calculated and/or selected by the control device148according to the braking demand signal, if appropriate, as a function of further parameters. Pressure sensors (not illustrated) in the valve device1measure the modulated brake pressure, transmit the measurement results to the control device148via the electrical line166and168, respectively, such that feedback is provided and the brake pressure can be regulated by the control device148. Electronics for modulating and/or regulating the brake pressure are thus provided in the control device148. The valve device1therefore need not have any control electronics or regulating electronics. It is however alternatively also possible for some or all of the electronics for regulating the brake pressure to be arranged on the valve device1.

The brake pressure modulated by the valve device1or the 1-channel axle modulator1at the front axle136is provided via a compressed-air line171and172, respectively, firstly to an ABS valve174and176, respectively, for an anti-lock brake function, and subsequently via a compressed-air line178and180, respectively, to the brake cylinder48and to a brake cylinder182, or to a diaphragm part of the brake cylinder48and182, respectively. The brakes132and134can be actuated by means of the brake cylinders48and182. The compressed air for this purpose is provided to the valve device1at the front axle136of the vehicle from the first brake circuit via a compressed-air line184.

By contrast, a compressed-air line186supplies compressed air from the second brake circuit to the valve devices1or the 2-channel axle modulator143at the rear axle142of the vehicle. The brake pressure modulated by the valve devices1at the rear axle142of the vehicle analogously to the modulation of the brake pressure medium by the valve device1at the front axle136is provided via a compressed-air line188and190, respectively, to a diaphragm part of a combined spring brake cylinder192and194, respectively.

The brake system130furthermore provides functions of an anti-lock system, traction control and electronic stability control. Rotational speed information of the individual wheels of the vehicle during driving and during the braking process is required for this purpose. The brake system130therefore has wheel sensors196,198,200and202, which detect wheel rotational speeds of the individual wheels and transmit measurement values or information regarding the detected wheel rotational speeds to the control device148via an electrical line204,206,208and210, respectively.

The anti-lock function is intended to counteract a locking tendency of the wheels. If a locking tendency of a wheel at the rear axle142of the vehicle is identified, the valve device1assigned to the wheel is therefore actuated via the electrical line168in order to release the brake138or140, respectively, or in order to ventilate the diaphragm part of the combined spring brake cylinder192or194, respectively, via the compressed-air line188or190, respectively, or in order to lower the pneumatic pressure in the respective diaphragm part. By contrast, at the front axle, to release the brake132or134in the event of a blocking tendency being identified, the ABS valve174or176, respectively, is actuated by the control device148via an electrical line212or214, respectively. In response to this, the ABS valve174or176, respectively, ventilates the compressed-air line178or180, respectively, or at least increases the pressure prevailing therein no further.

It is also the case if an impending or actual loss of stability or skid tendency of the vehicle is detected by means of the electronic stability function that the ABS valves174and176and the valve devices1at the rear axle142of the vehicle can be actuated in a targeted manner in order to influence the pressure in the compressed-air lines178,180,188and190or brake individual wheels in a targeted manner, as described for the ABS function.

It is likewise possible for the electronic stability function, and in addition to the traction control, for the pressure in the compressed-air lines178,180,188and190to be increased in a targeted manner. In the case of the traction control, the control device148identifies slip of the wheels from the detected wheel rotational speeds and if appropriate from further data, and thus actuates the valve devices1in order to brake the wheels to counteract the slip or prevent spinning of the wheels. Here, at the rear axle142, it is possible for the two wheels to be braked independently of one another. By contrast, at the front axle136, the 1-channel axle modulator or the valve device1is responsible for braking the wheels. The brakes132and134at the wheels of the front axle136may also be acted on with different brake pressures owing to the ABS valves174and176. In this exemplary embodiment, two valve devices1as wheel modulators are provided together to form the 2-channel axle modulator at the rear axle142, but only one valve device1is provided, as the 1-channel axle modulator, together with the two ABS valves174and176at the front axle136of the vehicle.

In an alternative exemplary embodiment, however, it is also possible for two valve devices1formed as wheel modulators, or a 2-channel axle modulator, to be provided at the front axle instead of the valve device1, which is used as a 1-channel axle modulator, with the two ABS valves174,176.

For the pneumatic modulation of the brake pressure in the redundancy situation, the redundancy pressure modulated by means of the brake actuating device54in the first brake circuit is conducted to the valve device1at the front axle136via a compressed-air line216. The valve devices1at the rear axle142analogously receive the modulated redundancy pressure from the second brake circuits via compressed-air lines218and220. In the case of an electrical failure or in the event of an electronics failure, the valve devices1modulate the brake pressure in the compressed-air lines178,180,188and190purely pneumatically in accordance with the respective redundancy pressure in the first and second brake circuit respectively, such that the vehicle with the brake system130can be braked pneumatically.

The brake system130furthermore actuates brakes on a trailer if appropriate. Via a compressed-air line222, the redundancy pressure from the second brake circuit is connected via a pneumatic interface to the trailer control valve device146. Via another pneumatic interface, a further compressed-air line224is connected to the trailer control valve device146, which provides the redundancy pressure to a compressed-air port226, which can be connected to pneumatic systems of the trailer. Compressed-air lines228,230and232are connected via further pneumatic interfaces of the trailer control valve146. A modulated reservoir air pressure can be drawn via the compressed-air line228, and a reservoir air pressure can be drawn directly via the compressed-air line230, from the third brake circuit and provided via the compressed-air line232to a compressed-air port234for connecting to compressed-air systems of the trailer. Here, the compressed air with the modulated air pressure is drawn via a parking brake actuating device236, which in turn draws the reservoir air pressure from the third brake circuit via compressed-air lines238,240and242. Electrical actuation and monitoring of the trailer control valve146takes place via the electrical line170.

A parking brake function of the brake system130can be controlled by means of the parking brake actuating device236. The parking brake function can be activated and deactivated by the parking brake actuating device236separately for the vehicle and for the trailer, which is possibly coupled to the vehicle. The supply of compressed air takes place from the third brake circuit. To engage or release the parking brake function, spring store parts of the spring brake cylinders192and194are aerated or ventilated, respectively. For this purpose, the parking brake actuating device236provides the modulated parking brake pressure via a compressed-air line244to a relay valve246, which boosts the air pressure with compressed air drawn via a compressed-air line248and, in order to release the parking brake, provides the air pressure to spring store parts of the combined spring brake cylinders192and194via compressed-air lines250and252.

All of the features specified in the above description and in the claims may be used both individually and also in any desired combination. The disclosure of the inventive embodiments is thus not restricted to the described or claimed combinations of features. Rather, all combinations of features should be regarded as being disclosed.