DE102014012645A1 - Compressed air supply system, pneumatic system and method for operating a pneumatic system - Google Patents

Abstract

The invention relates to a compressed air supply system (10) for operating a pneumatic system (90), in particular an air spring system of a vehicle, comprising: - a compressed air supply (1), - a compressed air connection (2) to the pneumatic system (90), - a vent connection (3) Environment, and - a first pneumatic connection (600) at least between the compressed air supply (1) and the compressed air connection (2) having at least one controllable, pilot-operated check valve (63), - one with the first pneumatic connection (600) and a venting connection (3) pneumatically connected second pneumatic connection (700) with at least one controllable vent valve (73), wherein - the controllable pilot operated check valve (63) and the controllable vent valve (73) via at least one pneumatic control line (123) with a check valve (63 ) and the vent valve (73) associated, in particular single, elek and the venting valve (73) are integrated together in a valve assembly (40) connected to the control valve (74) via the at least one pneumatic control line (123) , and - by means of an electrical control of the control valve (74) the check valve (63) from a first switching state (63A) to a second switching state (63B) and the controllable venting valve (73) from a first switching state (73A) to a second switching state ( 73B) is convertible.

Description

The invention also relates to a method according to the preamble of claim 22 for operating a pneumatic system, in particular an air spring system of a vehicle.

A compressed air supply system is used in vehicles of all kinds, in particular for supplying an air spring system of a vehicle with compressed air. Air suspension systems may also include level control devices, with which the distance between the vehicle axle and vehicle body can be adjusted. An air spring system of a pneumatic system mentioned above comprises a number of air bellows pneumatically connected to a common line (gallery), which can lift the vehicle body with increasing filling and accordingly lower with decreasing filling. With increasing distance between the vehicle axle and vehicle body or ground clearance, the spring travel longer and larger bumps can be overcome without causing a contact with the vehicle body. Preferably, such systems are increasingly being used in off-road vehicles and sport utility vehicles (SUVs). Especially with SUVs, it is desirable for very powerful engines to provide the vehicle on the one hand for high speeds on the road with relatively low ground clearance and on the other hand to provide for the terrain with a relatively large ground clearance. It is further desirable to implement a change in ground clearance as quickly as possible, which increases the requirements for speed, flexibility and reliability of a compressed air supply system.

To ensure long-term operation of the compressed air supply system, a pneumatic main line of the compressed air supply system has an air dryer with which the compressed air is to be dried. This avoids the accumulation of moisture in the pneumatic system. Moisture can lead to valve-damaging crystal formation at comparatively low temperatures and moreover to undesired defects in the compressed air supply system and in the pneumatic system. An air dryer has a desiccant, usually a granular bed, which can be flowed through by the compressed air, so that the granular bed can absorb moisture contained in the compressed air by adsorption. An air dryer may optionally be designed as a regenerative air dryer. This can be done by the granule bed at each venting cycle with the dried compressed air from the pneumatic system, in particular an air spring system - usually in countercurrent, DC but also partially relative to the filling direction - flows through. A regeneration of the air dryer is essentially made possible by a pressure change at the air dryer, wherein a pressure compared to the adsorption in the regeneration pressure is regularly lower to allow a moisture release from the granules. For this purpose, the vent valve assembly can be opened, wherein the regeneration capability of the air dryer is regularly dependent on the pressure conditions and the pressure swing amplitude in the compressed air supply system. Even for such a so-called pressure swing adsorption, it has been found desirable to design a compressed air supply system flexible and reliable at the same time. In particular, on the one hand, a comparatively fast venting is to be made possible, and yet, for a regeneration of the air dryer, sufficiently high pressure swing amplitude low air pressure - d. H. during regeneration - are available.

Various approaches are known from the prior art to design a first pneumatic connection between an aforementioned compressed air supply and a pneumatic system mentioned above. These take into account the basic functions of a compressed air supply system when venting the pneumatic system and venting the pneumatic system. With regard to the abovementioned demand for a comparatively rapid venting with sufficiently low air pressure nevertheless for a regeneration of the air dryer, these are still in need of improvement.

The compressed air supply system of EP 1 046 521 B1 discloses in pneumatic parallel connection a non-return valve blocking in the venting direction and a stop piston which can be unlocked in the venting direction of a controllable directional control valve. In the pneumatic main line between air dryer and air spring system designed as a pneumatic parallel circuit section is arranged with two mutually parallel branch lines, wherein in a first branch line for filling the air spring system flow-through check valve and in a second branch line for venting the air spring system flow-through check valve with a throttle and a switching valve is connected in series.

DE 10 2007 013 673 B4 describes a compressed air supply device for a commercial vehicle having a first valve device and a second valve device by means of which an energy saving control output or a discharge valve device and the regeneration of a filter unit are controllable.

Out DE 35 42 974 A1 The applicant is aware of a level control device provided with air filters for vehicles, with which, depending on the vehicle load, a predetermined distance of the vehicle compartment from the vehicle axle can be set by filling or emptying the air springs. The device has a controllable with the pressure in the air springs safety valve. Regeneration of the air dryer is possible in such a system via a throttle and a non-return valve to be opened against a filling direction. It has been shown that the system is advantageously suitable to save compressed air even with a regeneration of the air dryer by the separation of compressed air supply system and pneumatic system with the first check valve.

The compressed air supply system of DE 35 42 974 A1 The Applicant has long been proven, but is still improvable, especially if a comparatively flexible and fast compressed air handling in relatively short periods of time is required. In particular, it can be seen that limited nominal diameters of a throttle, taking account of regeneration aspects of the air dryer, can have effects on the air throughput of the compressed air supply system and thus the flexibility of the same.

Overall, known compressed air supply systems can be improved even more in terms of nominal widths, energy requirements and switching precision.

DE 10 2010 054 699 A1 relates to a compressed air supply system of the type mentioned for operating a pneumatic system, in particular an air spring system of a vehicle, comprising: a compressed air supply, a first pneumatic connection between the compressed air supply and the pneumatic system having an air dryer, a throttle means and at least one controllable isolation valve, one with the first pneumatic connection and a vent connection to the environment pneumatically connected second pneumatic connection with at least one controllable vent valve. It is provided that the at least one controllable isolation valve and the throttle means form a series arrangement in the first pneumatic connection, such that the at least one controllable isolation valve in a flow-through operation in an open state and in a separation operation in a closed state is switchable, wherein in closed state, the first pneumatic connection is bidirectionally and completely closed and the at least one controllable isolation valve in a flow-through operation between a first, a closed state associated control state and a second, an open state associated control state, is switchable.

In such a compressed air supply system, a gallery of the pneumatic system can be locked against the compressed air supply system; As a result, a wiring of a solenoid valve in the pneumatic system can be done without the volume of the air dryer is filled with. Nevertheless, the structure of such a compressed air supply system can be improved.

DE 10 2011 109 500 A1 discloses a compressed air supply system in which the isolation valve is formed in a pneumatic main as a pneumatically releasable check valve. In a further development, a double relay piston can be provided, which can be pressurized in such a way that the non-return valve can be unlocked and at the same time a venting valve can be actuated. This simplification requires a sensitive circuit of the double relay piston.

It is desirable to have a compressed air supply system which is flexible in terms of its switching operation and nevertheless energy-saving, preferably with high control quality, designed.

At this point, the invention begins, whose task is to provide a compressed air supply system and a method for operating a pneumatic system, which is improved in terms of the prior art, in particular has a reliable, yet flexible, optionally fast functioning. In particular, an air dryer should be protected against unfavorable influences, preferably a pneumatic system be operated independently of the air dryer. In particular, a compressed air supply system should be constructed comparatively simple. Preferably, however, a comparatively rapid venting should be made possible with dryer regeneration that is as advantageous as possible. In particular, an acoustics of the compressed air supply system should be improved. The object of the invention is also to provide an advantageously designed pneumatic system with the compressed air supply system.

Regarding the compressed air supply system, the object is achieved by the invention with a compressed air supply system of the type mentioned, are provided in accordance with the invention, the features of the characterizing part of claim 1.

According to the invention, it is provided that the controllable check valve is formed as a first part valve of a double valve and the controllable vent valve as a second part valve of the double valve, wherein the first and second part valve after the same part principle, at least one or more pneumatically active valve parts has the same design, in particular identically formed.

In particular, it is provided that the controllable check valve is formed as a first part valve of a double valve and the controllable vent valve as the second part valve of the double valve, wherein further provided in particular that the first and the second part valve are formed identically according to a common part principle.

Overall, on the one hand the difficulties associated with a double relay piston or the like slide principle can be avoided and on the other hand offers the design as a double valve preferred ways to influence the timing of a switching operation at the check valve and vent valve suitable; this without disproportionate tax expense.

The invention provides the basis for a suitable influencing of a time sequence of a switching operation in the check valve and vent valve by at least one or more pneumatically active valve parts of similar design, in particular identical, are. For example, in the context of a preferred development, one or more identically designed, in particular pneumatically movable valve parts, such as a valve disk and / or a valve piston, which have the same geometric shape on the same part principle, are set or preset differently in the first part valve and the second part valve of the double valve , z. Example by means of a valve disc closing spring and / or by means of a piston spring, in particular such that a time of a switching state change is different.

Preferably, the controllable non-return valve and the controllable vent valve in a single Steuerdruckbeaufschlagung the at least one pneumatic control line by means of the single control valve in each case from the first to the second switching state can be transferred.

In particular, when a control of the control valve under energization of a switching coil of the control valve, the check valve is unlocked and to open the controllable vent valve.

The invention is based on the consideration that the concept of a substantially actuatable on the one hand unlockable check valve in a main pneumatic line and on the other hand a vent valve in a vent line has proven to be fundamentally advantageous. Both the check valve and the vent valve can be actuated jointly by a control valve. In addition, the invention has recognized that it is possible with nevertheless comparatively simple design of the valve assembly with vent valve and check valve, a switching sequence of the same targeted and yet to influence with relatively little tax effort.

The invention also leads to a pneumatic system with the aforementioned compressed air supply system and with a pneumatic system, in particular an air spring system of a vehicle.

• – das erste und das zweite Teilventil nach einem Gleichteilprinzip gleichartig ausgebildet sind, und
• – das steuerbare Rückschlagventil und das steuerbare Entlüftungsventil bei einer Steuerdruckbeaufschlagung der wenigstens einen pneumatischen Steuerleitung, insbesondere mittels eines einzigen Steuerventils, in etwa gleichartig von dem ersten in den zweiten Schaltzustand überführt werden, wobei
• – ein Zeitpunkt der Schaltzustandsänderung unterschiedlich ist.

The invention also leads to a method for operating a pneumatic system, in particular an air spring system of a vehicle, with a compressed air supply system of the aforementioned type, wherein the controllable check valve is formed as the first part of a double valve valve and the controllable vent valve as the second part of the valve double valve

• - The first and the second part valve are formed identically according to a common part principle, and
• - The controllable check valve and the controllable vent valve at a Steuerdruckbeaufschlagung the at least one pneumatic control line, in particular by means of a single control valve, are transferred in a similar manner from the first to the second switching state, wherein
• - A time of switching state change is different.

Advantageous developments of the invention can be found in the dependent claims and specify in particular advantageous ways to realize the above-described concept within the scope of the problem and with regard to further advantages.

In particular, it can be provided that one or more identically designed pneumatically active valve parts of the first part valve and the second part valve of the double valve are set or preset in different ways such that the time of the switching state change is different.

Such and other advantageous developments of the invention -. a. Also with regard to the construction of the double valve - are to be found in the dependent claims and specify in detail advantageous ways to realize the above-mentioned concept in the context of the task and in terms of further benefits.

• – Ventilkolben, Ventilaufnahmeöffnung im Bauteil, Ventilkolbenanschlag des Ventilkolbens;
• – Ventilteller, Ventiltelleraufnahmeöffnung im Bauteil, Ventiltellersitz des Ventiltellers;
• – wenigstens eine Kolben- und/oder Ventiltellerdichtung, Kolbenfeder, Ventiltellerschließfeder, Kolbenfeder. Insbesondere können diese oder anderen aktiven Ventilteile jeweils des ersten und zweiten Teilventils nach dem Gleichteilprinzip dieselbe geometrische Gestalt haben.

Preferably, the similar formed active valve parts of the first and second part valves are selected from the group of valve parts consisting of:

• - valve piston, valve receiving opening in the component, valve piston stop of the valve piston;
• - valve disk, valve disk receiving opening in the component, valve disk seat of the valve disk;
• - At least one piston and / or valve disc seal, piston spring, valve disc closing spring, piston spring. In particular, these or other active valve parts of each of the first and second part valves may have the same geometric shape according to the same part principle.

In the context of a particularly preferred development, the entire first and the entire second part valve according to a common part principle has a completely similar training. In the case it is ensured that both the pilot-operated check valve and the vent valve have a mechanically predetermined similar, in particular exactly the same, switching behavior.

On this basis, a different temporal response of the shut-off of the gallery and venting measure can be particularly well represented. In particular, by using measures based thereon, it is possible to achieve damped dryer ventilation, for example by reducing a venting duct and mechanically striking it. In the context of a Ausführungsat explained with reference to the drawings, it has proved to be particularly advantageous that the valve piston of the first and second part valves are implemented identical with a sprung valve plate and the first and second part valve then as a vent valve or as a pilot-operated check valve in the Gallery operated.

Based on one or more of the aforementioned developments, it has proved to be particularly advantageous that one or more identically designed pneumatically active valve parts of the first part valve and the second part valve of the double valve are set or preset differently.

In particular, such active valve parts of the first and second part valves can be set differently or preset, which have the same geometric shape according to the same part principle. This particularly advantageously relates to a piston spring, a valve disc closing spring and / or a piston spring, which have the same design and different strength and / or bias. Thus, a different temporal response can be achieved by different spring forces on the general principle for identically designed springs. For this purpose, different springs may be provided or different spring preloads. It can also be provided in a later responsive valve piston, a second spring. It is also possible to use a piston rear space as a gas spring, in particular a sealingly sealed off one; this can also lead to a supporting spring force of a mechanical spring arranged opposite the piston rear space. In principle, different spring forces can be provided. In particular, a mechanical spring may be more or less biased or more or less supported by said gas spring.

Additionally or alternatively, a valve piston stop and / or a valve disk seat can be provided with different seat heights and / or diameters and / or different idle strokes for a valve piston or valve disk. For this purpose, in particular, a valve piston receiving opening in the housing of the valve component and / or a valve disk receiving opening in the housing of the valve component, in particular in a valve piston, can be expediently dimensioned. In particular, in the first and second part valves, a valve piston stop and / or a valve disk seat are positioned differently relative to one another along the valve component axis such that different seat heights of the valve piston or the valve disk are present and / or different idle strokes of the valve piston or the valve disk during operation are given. Additionally or alternatively, in the case of the first and second part valves, a valve piston stop and / or a valve disk seat is extended differently relative to one another transversely to the valve component axis, such that different diameters of the valve piston or the valve disk are provided.

In an additional or alternative development annular spaces on the valve piston and / or the valve receiving opening may have different volumes. For example, different large drive volumes of the piston ring space can be realized. It is also possible, for example, to realize a throttling of the control air flow differently or a different throttling in the piston back ventilation.

Additionally or alternatively, an annular space can be designed in each case for the first and second part valve on the valve disk, in particular on the valve disk receiving opening between a valve disk and a valve piston and / or between a valve piston and a housing of the valve component with different volumes. This can be used in any case to a temporally different response of the first and second part valve. In particular, different opening forces for the first and second part valves can be realized on the valve disk. For example, this can be set differently by a valve seat diameter or gas forces on a valve disk.

In an additional or alternative development, it has also proved to be advantageous that the piston and / or valve seals have different pressures. For example, additionally or alternatively, different frictional forces can be set in the first and second part valves. Preferably, this can be increased or decreased O-ring pressures. Additionally or alternatively, the surfaces in the housing can be designed differently (eg by means of coating, roughness, etc.).

Such and other measures, which are not listed here, can be realized in different ways, either by means of the above-mentioned different interpretation of basically the same parts of the same principle and / or by the same design of the common parts, but preferably a variation of the surrounding components or the periphery of the common parts. For example, it has proved to be advantageous to configure all the valve piston components identically or identically but to stress them differently. For example, a piston spring force may be different or a spring bias may be different in a valve disk or in a valve piston or between a piston and a valve disk. Also, a vent valve plate can be firmly integrated in the valve piston. Overall, by means of the concept of the invention or according to a further development thereof, it is particularly advantageous to specify a method for operating a compressed air supply system.

The principle is implemented by identical valve piston with spring-loaded valve plate, which are operated as a vent valve and as a pilot-operated check valve in the gallery.

• – Beim Füllen wird das Rückschlagventil (RSV) durch den Kompressor geöffnet.
• – Bei Druckausgleich schließt das RSV durch Federkraft.
• – Beim Entlüften wird das RSV pneumatisch durch den Entsperrkolben geöffnet, sobald das Magnetventil angesteuert wird, um beide Ventilkolben zu betätigen. Dabei muss das Entlüftungsventil immer vor dem Entsperrventil öffnen. Wird der Magnet geschlossen, entweicht die Vorsteuerluft aus dem Ringraum beider Ventilkolben in die Entlüftung und beide Ventile werden durch die Federkraft und die Auslegung der Steuerflächen zeitlich definiert geschlossen. Werden Speicher- und/oder Balgventile geöffnet und die Galerieleitung mit Druckluft befüllt, dann wird der Lufttrockner aufgrund des geschlossenen Rückschlagventils nicht mit gefüllt. Die bisherige Schaltlogik wird davon nicht berührt. D. h., die erfindungsgemäße Lösung ist absolut serienkonform.

Pneumatic separation of air dryer and gallery in the operating states "lifting from the storage", "measuring pressure in the bellows" and possibly "measuring pressure in the storage"

• - When filling, the check valve (RSV) is opened by the compressor.
• - At pressure equalization the RSV closes by spring force.
• - When venting, the RSV is pneumatically opened by the release piston as soon as the solenoid valve is actuated to actuate both valve pistons. The vent valve must always open before the unlock valve. When the solenoid is closed, the pilot air escapes from the annulus of both valve pistons into the vent and both valves are closed in time by the spring force and the design of the control surfaces. If storage and / or bellows valves are opened and the gallery line is filled with compressed air, then the air dryer will not be filled due to the closed non-return valve. The previous switching logic is not affected. In other words, the solution according to the invention is absolutely in conformity with the series.

In principle, the first and second part valves can be arranged differently in the valve assembly. The first part valve preferably has a first valve axis and the second part valve has a second valve axis. These can be aligned in a first variant the same, for example, be directed in parallel or antiparallel directed against each other. In a second variant, the valve axes may coincide, in particular lie one behind the other or lie one above the other. In a third variant, the first and second part valves in the valve component with the first and the second valve axis may be arranged parallel to one another, in particular next to one another. For example, the first and second part valve in the valve member may be arranged back to back or side by side according to one of the aforementioned variants.

The orientation of the first and second part valve relative to the valve member can be realized differently according to need and space requirements. For example, the first and second valve axis lengths may be aligned along an elongate valve member axis. In a variant, the first and second valve axes can also be arranged transversely to one another or perpendicular to one another, in particular transversely or perpendicular to a valve component axis.

Basically, the concept according to one of the developments in different pressure supply systems can be realized. As particularly preferred, the concept has proven, in a compressed air supply system, in which the first pneumatic connection is formed as a pneumatic main line between the compressed air supply and the compressed air connection, in addition to the controllable unlockable check valve, an air dryer, a throttle means, a first throttle and a first Control branch connection for a first pneumatic control line to the control valve has. In particular, it has also proved to be advantageous that the second pneumatic connection is formed as a vent line between the compressed air supply and the vent port, which has a second throttle in addition to the controllable vent valve. An embodiment exemplified on this basis is described below with reference to the drawings.

In addition, with reference to the aforementioned developments, in particular the embodiment described in the drawing, a whole series of further advantages, which in the Below, in particular with reference to further differences from the prior art are listed.

Preferably, the backflow of the medium is prevented by a check valve; this implements a preferred shut-off function of the gallery and pneumatic main. For example, a standard 5-way block of valves in the pneumatic system can be maintained according to one embodiment. In particular, an installation space of the compressor unit can be maintained.

As a result, the concept of a development of the invention allows the use of established structures while achieving further advantages, in particular in the context of a concrete embodiment according to the drawing.

The concept is particularly suitable for systems with memory. Noise pollution is reduced (less dryer ventilation). One or more of the following advantages can be achieved with the concept, in particular to address at least one of the above-described problems of the prior art; achievable benefits include: energy savings, improved control performance, improved efficiency of regeneration, lower load and thus prolonged life of the air dryer, elimination of dry vent after transfer from the store and measurements of bellows and accumulator pressure, no external wiring or logic / electronics / software required , especially compatible with previous compressed air supply systems, nominal neutral, especially when assembly is dimensioned accordingly, pilot function in the "dry" branch of the air supply arranged (not freezes - only the vent valve plate is possibly arranged in a "wet" area), reduced control times in the vehicle Approximately 30% compared to solutions without a locked gallery, alternative to a double block blocked dryer, less circuit complexity than with an active switching valve.

Embodiments of the invention will now be described below with reference to the drawing. This is not necessarily to scale the embodiments, but the drawing, where appropriate for explanation, executed in a schematized and / or slightly distorted form. With regard to additions to the teachings directly recognizable from the drawing reference is made to the relevant prior art. It should be noted that various modifications and changes may be made in the form and detail of an embodiment without departing from the general idea of the invention. The disclosed in the description, in the drawing and in the claims features of the invention may be essential both individually and in any combination for the development of the invention. In addition, all combinations of at least two of the features disclosed in the description, the drawings and / or the claims fall within the scope of the invention. The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below or limited to an article which would be limited in comparison to the subject matter claimed in the claims. For the given design ranges, values within the stated limits should also be disclosed as limit values and be arbitrarily usable and claimable. For simplicity, the same reference numerals are used below for identical or similar parts or parts with identical or similar function.

Further advantages, features and details of the invention will become apparent from the following description of the preferred embodiments and from the drawing; this shows in:

1 a circuit diagram of a pneumatic system with a particularly preferred embodiment of a compressed air supply system according to a first variant of the invention, wherein the controllable unlockable check valve and the controllable vent valve via at least one pneumatic control line with the non-return valve and the vent valve associated, in particular single, electrically controllable control valve are connected;

2 a circuit diagram of a pneumatic system with a modified embodiment of a compressed air supply system in which the check valve and the vent valve are integrated together in a valve assembly which is connected to the control valve via the at least one pneumatic control line, wherein the controllable check valve as the first part of a valve double valve valve assembly and the controllable vent valve is formed as a second part valve of a double valve of the valve assembly, wherein the first part valve and the second part valve of the double valve have the same geometric shape on the same part principle - a first switching state of the check valve is shown therein and a second switching state of the check valve is in a detail Y shown;

3 a section X of the 2 to explain a double valve of the valve assembly.

Hereinafter, identical or similar parts or parts become more identical or similar Function, where appropriate, the same reference numerals.

1 shows a pneumatic system 100 with a compressed air supply system 10 and a pneumatic system 90 in the form of an air spring system for a vehicle not shown in detail 1000 , The pneumatic system 90 , here in the form of the air spring system, in this case has a number of four so-called bellows 91 on, each associated with a wheel of a vehicle, not shown, and form an air spring of the vehicle. Furthermore, the pneumatic system 90 a memory 92 for storing quickly available compressed air for the bellows 91 on. The bellows 91 is each in a spring branch line 98 a solenoid valve 93 upstream, which each as a level control valve to open or close one with a bellows 91 formed air spring serves. The solenoid valves 93 in the spring branches 98 are designed as 2/2-way valves. A store 92 is in a storage branch 99 a solenoid valve 94 in the form of a further 2/2-way valve upstream as a storage valve. The solenoid valves 93 . 94 are by means of the spring and storage branch lines 98 . 99 to a common bus, a gallery 95 forming pneumatic line, connected. The gallery 95 is via another pneumatic line 96 to form a pneumatic connection with a compressed air connection 2 the compressed air supply system 10 pneumatically connected. In the present case are the solenoid valves 93 . 94 in a valve block 97 arranged with five valves. The solenoid valves 93 . 94 are in 1 shown in a de-energized state - there are the solenoid valves 93 . 94 formed as normally closed solenoid valves. Other, not shown, modified embodiments may have a different arrangement of the solenoid valves 93 . 94 realize - fewer solenoid valves can be used in the context of the valve block.

The pneumatic system 90 may have a voltage / pressure sensor not shown here in detail, which in an additional, not shown here branch line to the gallery 95 can be connected so that over the voltage / pressure sensor a pressure in the gallery 95 the pneumatic system 90 can be measured.

The compressed air supply system 10 is used to operate the pneumatic system 90 , The compressed air supply system 10 has a compressed air supply 1 and a compressed air connection 2 to the pneumatic system 90 on. The compressed air supply 1 is present with an air supply 0 , one of the air supply 0 upstream air filter 0.1 and one of the air supply 0 downstream via a motor M driven air compressor 51 at an air supply connection 51 for air supply 0 educated.

A first pneumatic connection 600 is present with a single pneumatic main 60 between the compressed air supply 1 and the compressed air connection 2 formed on a compressed air supply connection 52 a compressor 50 and on the other hand to the compressed air connection 2 as well as the other pneumatic line 96 to form the pneumatic connection connects. In the pneumatic main 60 is an air dryer 61 and a first throttle 62 arranged with predetermined first nominal diameter. Moreover, in the pneumatic main 60 a separating valve with a pneumatically actuated non-return valve 63 arranged. The pneumatically operated check valve 63 is present in a pneumatic series circuit with the throttle 62 in the pneumatic main 60 arranged, the main pneumatic line 60 the only pneumatic line of the first pneumatic connection 600 is. The series arrangement of throttle 62 and pneumatically releasable check valve 63 So is between the air dryer 61 and the compressed air connection 2 to the pneumatic system 90 in the pneumatic main 60 arranged.

Next points the compressed air supply system 10 one with the pneumatic main 60 and a vent port 3 and more filters 0.3 and / or a silencer pneumatically connected second pneumatic connection 700 namely, with the vent line 70 on. In the present case is the vent line 70 at the compressed air supply 1 at the pneumatic main 60 connected. In the direction of the venting connection 3 is in the vent line 70 a second throttle 72 with second nominal diameter above the first nominal diameter and a controllable venting valve 73 arranged. That in, through the vent line 70 formed, second pneumatic connection 700 arranged vent valve 73 is present in a valve assembly 40 with the pneumatically operated check valve 63 integrated and both are via a control valve formed as a separate 3/2 valve 74 together controllable.

The controllable vent valve 73 is as part of indirectly switched relay valve part of a solenoid valve assembly 80 for the indirect switching of a compressed air volume from the pneumatic main line 60 fillable vent line 70 , In this case, the solenoid valve assembly 80 the control valve 74 in the form of the 3/2-way solenoid valve. The control valve 74 can with one over an electrical control line 83 transmittable control signal in the form of a voltage and / or current signal to the switching coil 82 of the control valve 74 be controlled. When activated, the control valve 74 from the in 1 shown de-energized position of the first switching state 74A in a the valve assembly 40 pneumatically actuated and to pneumatically to a main control line 110 opened position of the second switching state 74B in the one via the pneumatic main control line 110 from the pneumatic main line 60 derived pressure for pneumatic control of the controllable vent valve 73 as a relay valve and the pilot operated check valve 63 is passed on. These are the pneumatic control lines 123 , except for the main pneumatic control line 110 the pneumatic relay valve control line 120 and the pneumatic unlock line 130 at the control valve 74 directly or indirectly at the first and second connection 74X . 74Y of the control valve 74 connected.

The controllable vent valve 73 is present additionally with a pressure relief 75 Mistake. The pressure limit 75 engages via a pneumatic control line in front of the vent valve 73 - specifically between second throttle 72 and bleed valve 73 - From a pressure which, when exceeding a threshold pressure, the valve piston of the vent valve 73 against the force of an adjustable spring 76 from the valve seat lifts - so the controllable vent valve 73 even without control via the control valve 74 into the open position. In this way it avoids an unintentionally too high pressure in the pneumatic system 100 arises.

The control valve 74 separates in the presently closed state of the first switching state 74A the main control line 110 from the others of the pneumatic control lines 123 namely, the pneumatic relay control line 120 and the pneumatic release line 130 and is about the third port 74Z of the control valve 74 and a control vent line 170 with the venting connection 3 pneumatically connected. In other words, a between vent valve 73 and control valve 74 lying the branch connection 77 comprising the line section of the control lines 123 or the main control line 110 at the in 1 shown closed position of the first switching state 74A of the control valve 74 with the further vent line 170 between control valve 74 and vent port 3 connected. The control vent line 170 closes in the further branch connection 53 to the vent line 70 on, leaving the vent line 70 and the control vent line 170 in one between the other branch connection 53 and the vent port 3 lying section are merged.

In the present case, the compressed air supply system 10 continue the said pneumatic unlock line 130 between the control valve 74 and the check valve 63 on, on the branch connection 77 as well as said pneumatic relay valve control line 120 to the control line 110 connected. About the control valve 74 can so when queuing one of the pneumatic main 60 or from the other pneumatic line 96 via the pneumatic control line 110 derived control pressure on the one hand, the check valve 63 pressurizing the pneumatic release line 130 - ie by transferring the control valve 74 in the second switching state 74B So far as regards the control lines 123 open state - be unlocked and on the other hand, the vent valve 73 pressurizing the pneumatic relay valve control line 120 is transferred to the open state. In the case so the vent valve 73 from the in 1 shown first switching state 73A (closed) in the second switching state 73B (open) transferred and at the same time the check valve 63 from the in 1 shown first switching state 63A (closed) in the second switching state shown in detail Y. 63B transferred (open). Provided with particular advantage, performs the transfer of the control valve 74 in the open state not only to unlock the pilot operated check valve 63 , but also - as well as the between control valve 74 and bleed valve 73 lying line section of the pneumatic relay valve control line 120 is subjected to control pressure - to transfer the vent valve 73 from the closed position of the first switching state 73A in an open position of the second switching state 73B , In other words, the control valve is used 74 the solenoid valve assembly 80 for controlling the integrated in the valve assembly 40 together provided vent valve 73 and the check valve 63 , This leads to a pneumatic opening on both sides of the air dryer 61 at the transfer of the control valve 74 in the open position. This further through the compressed air supply system 10 Inmaceable operating position can be in operation for bleeding the pneumatic system 90 and simultaneously regenerating the air dryer 61 be used.

The detail Y in 1 shown operating position of the compressed air supply system 10 serves under flow of the check valve 63 - In detail Y shown in passage position of the second switching state 63B - especially for filling the pneumatic system 90 via the pneumatic main line 60 , These are the bellows 91 upstream solenoid valves 93 and / or the memory 92 upstream solenoid valve 94 brought into an open position. Nevertheless, with the position closed, the solenoid valves 93 . 94 in the pneumatic system 90 - Due to the present in the first switching state 63A not unlocked check valve 63 - An operating position of the pneumatic system 90 decoupled from the compressed air supply system 10 possible. In other words, a cross-over of bellows 91 (eg in off-road operation of a vehicle), filling the bellows 91 from the store 92 or a pressure measurement in the pneumatic system 90 over the gallery 95 be made without the compressed air supply system 10 is pressurized. In particular, the air dryer 61 due to the compressed air connection 2 for compressed air supply 1 locked check valve 63 in the first switching state 63A and the closed control valve 74 in the detail Y shown in passage position of the second switching state 63B Protected against unnecessary pressurization with compressed air.

In the presently illustrated embodiment, it has been recognized that pressurization of the air dryer 61 with compressed air not at every operating position of the pneumatic system 90 is advantageous. Rather, it is for an effective and fast regeneration of the air dryer 61 advantageous if this only in the case of a venting of the pneumatic system 90 with unlocked check valve 63 takes place - in detail Y shown in passage position of the second switching state 63B -, ie in a venting direction of compressed air connection 2 to the compressed air supply connection 52 , This is the control valve 74 in an open switching position of the second switching state 74B brought so that both the vent valve 73 in the second switching state 73B opens as well as the check valve 63 in the second switching state 63B is unlocked. A venting of the pneumatic system 90 can be done via the unlocked check valve 63 , the throttle 62 and with regeneration of the air dryer 61 as well as the second throttle 72 and the opened vent valve 73 to the vent connection 3 , 2 shows one in relation to 1 modified compressed air supply system 10 in which identical reference numerals are used for identical or similar parts or parts of identical or similar function, where appropriate. First of all is a supplement to the compressed air supply system 10 in the compressed air supply system, the pneumatically releasable check valve 63 in a first preferred, structurally realized embodiment shown.

This is in 2 the valve assembly 40 for the formation of a double valve 40 ' with a first part valve 41 in the form of a controllable check valve 63 and a second part valve 42 in the form of the controllable vent valve 73 shown. The housing 30 the valve assembly 40 has a first and second valve receiving opening 31 . 32 on, to which the aforementioned pneumatic control lines 123 , ie the main control line 110 , the relay valve control line 120 and the pneumatic release line 130 connect; this under training of the branch connections 77 between the pneumatic release line 130 and the pneumatic relay valve control line 120 , The valve assembly 40 even closes with her case 30 and the valve receiving openings therein 31 . 32 via connections E1, E2 to the vent line 70 for connection of the second part valve 42 or the vent valve 73 on, as well as connections H1, H2 to the main pneumatic line 60 for connection of the pilot operated check valve 63 or the first part valve 41 in the case 30 the valve assembly 40 at. Furthermore, the control connections S1, S2 are for the first and second part valves 41 . 42 on and in the case 30 shown and back venting ports A1, A2 on and in the housing 30 for connecting a ventilation option to the vent line 70 ,

The other, in particular moving parts of the first and second part valve 41 . 42 are for the sake of clarity in a section X magnifying view of the compressed air supply system 10 of the 3 shown which only the case 30 of the double valve 40 ' the valve assembly 40 shows.

In detail is 3 with reference to the aforementioned reference numerals of 2 and further each with numbering for the first and second part valve 41 . 42 in the valve receiving openings 31 . 32 explained. In the valve receiving openings 31 . 32 is in each case a movably arranged and each formed as a seal carrier first and second valve piston 43 . 44 arranged and each one the valve piston 43 . 44 and by this per stop movable first and second valve plate 45 . 46 , The first and second valve plates 45 . 46 is in each case in a first and second valve disk receiving opening 37 . 38 each within the seal carrier of the first and second valve pistons 43 . 44 arranged; ie forming an annular space between the valve disk 45 . 46 and valve piston 43 . 44 , The first or second valve piston 43 . 44 strikes a first or second valve piston stop 33 . 34 on and the first and second valve plate 45 . 46 lies in the valve disc receiving opening 37 . 38 liftable on a first or second valve disk seat 35 . 36 at. The first or second valve piston 43 . 44 is under pressure of a first and second piston spring 47 . 48 in the direction of the first and second valve disc 45 . 46 movable to a first or second valve disk seat 35 . 36 to press; if necessary against the pressure of a first or second valve disc closing spring 47 ' . 48 ' between valve plate 45 . 46 and valve piston 43 . 44 , The piston springs 47 . 48 are each at the bottom of the case 30 in the rear area of the valve piston 43 . 44 the first and the second valve seat 31 . 32 the valve assembly 40 established.

For sealing a back space region R1, R2 against a line region L1, L2 of the valve receiving openings 31 . 32 carries the trained as a seal carrier valve piston 43 . 44 one each against the housing 30 and valve piston 43 . 44 sealing first ring seal 49.1 . 49.2 for forming a valve seal 49 , In the rear area R1, R2 points the valve piston 43 . 44 another first and second ring seal 49.3 . 49.4 to form a piston seal 49 ' on; this for the delimitation of a pneumatic control volume V1, V2 to the line space L1, L2 between the valve piston 43 . 44 and housing 30 of the double valve 40 ' the valve assembly 40 ,

In the present case, the valve assembly 40 is the first and second part valve 41 . 42 each with its valve axis VA1 arranged side by side and parallel to each other, wherein each of the valve axes VA1, VA2 along an elongated valve component axis A of the valve assembly 40 or of the housing 30 of the double valve 40 ' is aligned; in particular present also transversely or at right angles to the main pneumatic line 60 ,

The first valve piston 43 in the present case serves as an unlocking piston and the second valve piston 44 in the present case serves as a vent piston. By applying a control pressure in a control volume V1, V2 with switched control valve 74 The release piston and the vent piston can be lifted from its valve piston stop and so open the vent valve and the check valve 63 unlock; For this purpose, the Entsperrkolben and venting piston in each case against the force of the compression spring 47 . 48 in the rear space R1, R2 in the direction of the rear space and the valve piston stop 33 . 34 lifted and the valve plate 45 . 46 from the valve seat 35 . 36 possibly lifted against the pressure force of the other compression spring - this under pneumatic back pressure on the valve plate and / or valve piston in the pneumatic main line 60 or vent line 70 ,

A pneumatic separation of air dryer and gallery is made especially for one or more, preferably all, operating conditions such as "lifting from memory", "measuring pressure in bellows" and possibly "measuring pressure in the memory". When filling, the check valve is opened by the compressor. When pressure equalization closes the check valve 63 by spring force. When bleeding, the check valve 63 pneumatically opened by the release piston as soon as the control valve 74 , here in the form of a solenoid valve, is driven to actuate both valve pistons. It is preferred and acoustically advantageous that the vent valve always opens before the unlock valve.

If the magnet is closed, the pilot air escapes from the annulus of both pistons - ie the first valve piston 43 as Entsperrkolben and the second valve piston 44 as a venting piston - in the vent and both valves 41 . 42 are closed in time defined by the spring force and the design of the control surfaces. Are storage and / or bellows valves 93 opened - ie when printing in the gallery 95 - becomes the air dryer 61 not filled with. The previous switching logic is not affected. D. h., The solution according to the described embodiment is advantageously in series.

LIST OF REFERENCE NUMBERS

0

air supply

0.1

air filter

0.3

filter

1

Compressed air supply

2

Compressed air connection

3

exhaust port

10

Compressed air supply system

30

casing

31

first valve receiving opening

32

second valve receiving opening

33

first valve piston stop

34

second valve piston stop

35

first valve seat

36

second valve seat

37

first valve disk receiving opening

38

second valve disk receiving opening

40

valve assembly

40 '

double valve

41

first part valve

42

second part valve

43

first valve piston

44

second valve piston

45

first valve plate

46

second valve plate

47

first piston spring

48

second piston spring

47 '

first valve disc closing spring

48 '

second valve disc closing spring

49

valve seal

49 '

piston seal

49.1

first ring seal

49.2

second ring seal

49.3

another first ring seal

49.4

another second ring seal

50

compressor

51

Air supply port

52

Compressed air supply port

53

branch port

600

first pneumatic connection

60

Pneumatic main line

61

air dryer

62

first throttle

63

check valve

63A

first switching state of the check valve 63

63B

second switching state of the check valve 63

700

second pneumatic connection

70

vent line

72

second throttle

73

vent valve

73A

first switching state of the vent valve 73

73B

second switching state of the vent valve 73

74

control valve

74A

first switching state of the control valve 74

74B

second switching state of the control valve 74

74X

first connection of the control valve 74

74Y

second connection of the control valve 74

74Z

third connection of the control valve 74

75

pressure relief

76

adjustable spring of the venting valve

77

first branch connection

78

second branch connection

80

Solenoid valve assembly

82

switching coil

83

electrical control line

90

pneumatic system

91

bellows

92

Storage

93

Solenoid valve of the bellows 91

94

Solenoid valve of the memory 92

95

gallery

96

additional pneumatic line

97

manifold

98

Spring branch line

99

Storage branch line

100

pneumatic system

110

pneumatic main control line

120

pneumatic relay valve control line

130

unblocking

123

pneumatic control lines

170

Control vent line

1000

vehicle

A

Valve component axis

A1

Rear exhaust vent connection of the first part valve 41

A2

Rear exhaust vent connection of the second part valve 42

E1

Connection of the second part valve 42 to the compressed air supply 1

E2

Connection of the second part valve 42 to the vent line 70

H1

Connection of the first part valve 41 to the air dryer 61 extending pneumatic main 60

H2

Connection of the first part valve 41 to the second branch connection 78 leading pneumatic main 60

L1

first conduit space of the first part valve 41

L2

second conduit space of the second part valve 42

R1

first rear area of the first part valve 41

R2

second rear area of the second part valve 42

S1

first control connection of the first part valve 41

S2

second control port of the second part valve 42

V1

first control volume of the first part valve 41

V2

second control volume of the second part valve 42

VA1

first valve axis of the first part valve 41

VA2

second valve axis of the second part valve 42

X

neckline

Y

detail

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1046521 B1 [0005]
• DE 102007013673 B4 [0006]
• DE 3542974 A1 [0007, 0008]
• DE 102010054699 A1 [0010]
• DE 102011109500 A1 [0012]

Claims (23)

Compressed air supply system ( 10 ) for operating a pneumatic system ( 90 ), in particular an air suspension system of a vehicle, comprising: - a compressed air supply ( 1 ), - a compressed air connection ( 2 ) to the pneumatic system ( 90 ), - a vent port ( 3 ) to the environment, and - a first pneumatic connection ( 600 ) at least between the compressed air supply ( 1 ) and the compressed air connection ( 2 ), the at least one controllable, non-returnable check valve ( 63 ), - one with the first pneumatic connection ( 600 ) and a vent port ( 3 ) pneumatically connected second pneumatic connection ( 700 ) with at least one controllable venting valve ( 73 ), whereby - the controllable pilot operated check valve ( 63 ) and the controllable vent valve ( 73 ) via at least one pneumatic control line ( 123 ) with a check valve ( 63 ) as well as the vent valve ( 73 ), in particular single, electrically controllable control valve ( 74 ), wherein - the check valve ( 63 ) and the vent valve ( 73 ) together in a valve assembly ( 40 ) are integrated with the control valve ( 74 ) via the at least one pneumatic control line ( 123 ), and - by means of an electrical control of the control valve ( 74 ) the check valve ( 63 ) from a first switching state ( 63A ) in a second switching state ( 63B ) and the controllable vent valve ( 73 ) from a first switching state ( 73A ) in a second switching state ( 73B ), characterized in that - the controllable check valve ( 63 ) as the first part valve ( 41 ) of a double valve ( 40 ' ) and the controllable vent valve ( 73 ) as a second part valve ( 42 ) of the double valve ( 40 ' ), wherein the first part valve ( 41 ) and second part valve ( 42 ) according to the common part principle has at least one or more pneumatically active valve parts of similar design, in particular identically formed. Compressed air supply system according to claim 1, characterized in that the controllable check valve ( 63 ) and the controllable vent valve ( 73 ) at a one-time Steuerdruckbeaufschlagung the at least one pneumatic control line ( 110 . 120 . 130 ) by means of the single control valve ( 74 ) each of the first switching state ( 63A . 73A ) in the second switching state ( 63B . 73B ) are transferable. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that when the control valve ( 74 ) while energizing a switching coil ( 82 ) of the control valve ( 74 ) the check valve ( 63 ) and the controllable vent valve ( 73 ) is open. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the valve parts of each of the first part valve ( 41 ) and second part valve ( 42 ) are selected from the group consisting of: - valve piston ( 43 . 44 ), Valve receiving opening ( 31 . 32 ) in the component, valve piston stop ( 33 . 34 ) of the valve piston ( 43 . 44 ), - valve disc ( 45 . 46 ), Valve disc receiving opening ( 37 . 38 ) in the component, valve disk seat ( 35 . 36 ) of the valve disk ( 45 . 46 ), - at least one ring seal ( 49.1 . 49.2 . 49.3 . 49.4 ) for forming a valve and / or piston seal ( 49 . 49 ' ), Piston spring ( 47 . 48 ), Valve disc closing spring ( 47 ' . 48 ' ). Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the valve piston ( 43 . 44 ), the valve receiving opening ( 31 . 32 ), the valve piston stop ( 33 . 34 ), and the valve plate ( 45 . 46 ), the valve disk receiving opening ( 37 . 38 ) in the component, the valve disk seat ( 35 . 36 ) each of the first part valve ( 41 ) and the second part valve ( 42 ) have the same geometric shape, in particular the first part valve ( 41 ) and the second part valve ( 42 ) of the double valve ( 40 ' ) have the same geometric shape according to the same part principle. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first part valve ( 41 ) and the second part valve ( 42 ) are designed to be completely similar according to a common part principle. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that one or more identically designed, in particular pneumatically movable valve parts, such as a valve disc ( 45 . 46 ) and / or a valve piston ( 43 . 44 ), which have the same geometric shape according to the same part principle, at the first part valve ( 41 ) and at the second part valve ( 42 ) of the double valve ( 40 ' ) are set differently or preset, z. B. by means of a valve disc closing spring ( 47 ' . 48 ' ) and / or by means of a piston spring ( 47 . 48 ), in particular such that the time of a switching state change is different. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the piston spring ( 47 . 48 ) and Valve disc closing spring ( 47 ' . 48 ' ), are of similar design and have different spring strengths and / or spring preloads. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that at the first and second part valves ( 41 . 42 ) a valve piston stop ( 33 . 34 ) and / or a valve disk seat ( 35 . 36 ) are positioned differently relative to one another along the valve component axis (A), such that different seat heights of the valve piston ( 43 . 44 ) or the valve disk ( 45 . 46 ) are given and / or different idle strokes of the valve piston ( 43 . 44 ) or the valve disk ( 45 . 46 ) are given during operation and / or transversely to the valve component axis (A) are relatively different relative to each other, such that different diameters of the valve piston ( 43 . 44 ) or the valve disk ( 45 . 46 ) given are. Compressed air supply system according to one of the preceding claims, characterized in that valve disk receiving openings ( 37 . 38 ), and / or valve receiving openings ( 31 . 32 ) have different volumes. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the valve discs ( 45 . 46 ) associated annular spaces between valve disc ( 45 . 46 ) and valve piston ( 43 . 44 ) on the valve plate ( 45 . 46 ) and / or the valve piston ( 43 . 44 ) associated annular spaces between valve piston ( 43 . 44 ) and housing ( 30 ) on the valve piston ( 43 . 44 ) have different volumes. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized by - a first and second ring seal ( 49.1 . 49.2 ) for forming a valve seal ( 49 ) and another first and second ring seal ( 49.3 . 49.4 ) for forming a piston seal ( 49 ' ), and characterized by - a first and second valve piston ( 43 . 44 ), wherein - the first ring seal ( 49.1 ) another force on the first (valve piston ( 43 ) than the second piston ring seal ( 49.2 ) on the second of the valve pistons ( 44 ) and / or - the further first ring seal ( 49.3 ) another force on the first valve piston ( 43 ) than the other second ( 49.4 ) Ring seal ( 49.4 ) on the second valve piston ( 44 ), in particular the first and second ring seals ( 49.1 . 49.2 ) and / or for the execution of the other forces, the further first and further second annular seal ( 49.3 . 49.4 ) are formed with different pressures, material pairings and / or surface finishes, such that in each case different forces on the first and second valve piston ( 43 . 44 ). Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first part valve ( 41 ) a first valve axis (VA1) and the second part valve ( 42 ) has a second valve axis (VA2). Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first and second part valves ( 41 . 42 ) in the valve component ( 40 ) is arranged such that the first and second valve axis (VA1, VA2) are aligned, in particular parallel rectified or antiparallel directed against each other. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first and second valve axes (VA1, VA2) of the first and second part valves ( 41 . 42 ) in the valve component ( 40 ) lie one above the other or one behind the other on a common axis. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first and second valve axes (VA1, VA2) of the first and second part valves ( 41 . 42 ) in the double valve ( 40 ' ) are arranged parallel to each other. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first and second part valves ( 41 . 42 ) in the double valve ( 40 ' ) are aligned with their first and second valve axes (VA1, VA2) along a valve member axis (A). Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first and second part valves ( 41 . 42 ) in the valve component ( 40 ) is arranged such that the first and second valve axis (VA1, VA2) are arranged transversely to one another, in particular perpendicular to one another. Compressed air supply system ( 10 ) according to one of the preceding claims, characterized in that the first pneumatic connection ( 600 ) as a pneumatic main line ( 60 ) between the compressed air supply ( 1 ) and the compressed air connection ( 2 ), which in addition to the controllable, non-returnable check valve ( 63 ), an air dryer ( 61 ), a throttle means, in particular a first throttle ( 62 ), and a first control branch connection ( 78 ) for a first pneumatic control line ( 110 ) to the control valve ( 74 ) having. Compressed air supply system ( 10 ) According to one of the preceding claims characterized characterized in that the second pneumatic connection ( 700 ) as a vent line ( 70 ) between the compressed air supply ( 1 ) and the vent port ( 3 ), which in addition to the controllable, bleeder valve ( 73 ) a second throttle ( 72 ) having. Pneumatic system ( 100 ) with the compressed air supply system ( 10 ) according to one of the preceding claims and a pneumatic system ( 90 ), in particular an air suspension system of a vehicle ( 1000 ). Method for operating a pneumatic system ( 90 ), in particular an air suspension system of a vehicle ( 1000 ), with a compressed air supply system ( 10 ) according to one of claims 1 to 20, in which the controllable non-return valve ( 63 ) as the first part valve ( 41 ) of a double valve ( 40 ' ) and the controllable vent valve ( 73 ) as a second part valve ( 42 ) of the double valve ( 40 ' ), wherein - the first part valve ( 41 ) and the second part valve ( 42 ) are designed identically according to a common part principle, and - the controllable non-return valve ( 63 ) and the controllable vent valve ( 73 ) at a Steuerdruckbeaufschlagung the at least one pneumatic control line ( 123 ), in particular by means of a single control valve ( 74 ), similar to the first switching state ( 63A . 73A ) in the second switching state ( 63B . 73B ), wherein - a time of the switching state change is different. A method according to claim 22, characterized in that one or more identically designed, in particular pneumatically movable valve parts, such as a valve disc ( 45 . 46 ) and / or a valve piston ( 43 . 44 ), which have the same geometric shape according to the same part principle, at the first part valve ( 41 ) and at the second part valve ( 42 ) of the double valve ( 40 ' ) are set differently or preset, z. B. by means of a valve disc closing spring ( 47 ' . 48 ' ) and / or by means of a piston spring ( 47 . 48 ), in particular such that a time of a switching state change is different.

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