Compressed air supply system, pneumatic system, vehicle and operating method
The switchable air dryer protection valve and two-stage compressor system in the compressed air supply system address the issue of air dryer saturation by ensuring demand-based drying and efficient pressure management, enhancing system longevity and efficiency.
Patent Information
- Application Number
- PCT/EP2025/067234
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-07-12
- Filing Date
- 2025-06-19
- Publication Date
- 2026-01-15
Smart Images
Figure EP2025067234_15012026_PF_FP_ABST
Abstract
Description
[0001] Compressed air supply system, pneumatic system, vehicle and operating procedures
[0002] The invention relates to a compressed air supply system for a pneumatic system of a vehicle, in particular a commercial vehicle, comprising: a compressor for compressing compressed air, a compressed air supply system with a main compressed air connection for connection to the compressor, a main compressed air supply connection and a secondary compressed air supply connection for providing compressed air, a pneumatic main line for conveying compressed air from the main compressed air connection to the main compressed air supply connection, and a supply line for conveying compressed air from the main compressed air connection to the secondary compressed air supply connection. An air dryer for drying the compressed air is arranged in the pneumatic main line, with the supply line branching off from the pneumatic main line between the main compressed air connection and the air dryer.The main compressed air supply connection is for connecting a main consumer and the secondary compressed air supply connection is for connecting a secondary consumer.
[0003] The invention further relates to a pneumatic system with such a compressed air supply system, a vehicle with a corresponding pneumatic system, and a method for operating a pneumatic system for a vehicle, in particular a commercial vehicle.
[0004] In vehicles, compressed air supply systems serve to supply pneumatic devices, such as pneumatic systems, with compressed air. For this purpose, compressed air is supplied to the compressed air supply system via the main compressed air connection by a compressor. In this description, compressor and compressor are used synonymously and refer to units that compress air. Such a compressor, together with the compressed air supply system, forms a compressed air supply system. The control of such a compressed air supply system is preferably carried out by an electronic control unit (ECU). A compressed air supply system is used in all types of vehicles to supply a device with compressed air. The compressed air supply system, together with one or more devices, forms a pneumatic system.
[0005] Such consumers include, for example, air suspension systems, brake systems, sensor cleaning devices, signal horns or tire inflation systems.
[0006] Air suspension systems can also include leveling devices that adjust the distance between the vehicle axle and the vehicle body. An air suspension system of the aforementioned pneumatic system comprises a number of air springs pneumatically connected to a common line (“gallery”), which raise the vehicle body as they inflate and lower it as they deflate. Lowering the vehicle body requires venting the system, whereby compressed air from the system, and in particular from the air springs of the air suspension system, is released to the environment via a vent path in the compressed air supply system.Similarly, in a braking system, a braking force is applied by supplying compressed air via the compressed air supply system. To release the brakes of such a braking system, the consumer must be vented, whereby compressed air is released from the consumer to the environment via a vent line of the compressed air supply system. The filling direction describes the flow direction from the respective compressed air connection to the respective compressed air supply connection.
[0007] Furthermore, there are consumers, such as sensor cleaning devices, which, together with the corresponding compressed air supply systems, form an open compressed air supply. Compressed air is supplied to the consumer from the compressed air supply system, and the used compressed air is then released from the consumer into the environment. A sensor cleaning device can be used to clean surfaces on a vehicle, particularly sensor surfaces, using at least one cleaning fluid, such as compressed air. Regular cleaning of sensor surfaces on the vehicle can reduce sensor contamination and thus improve sensor reliability. To ensure the long-term operation of the compressed air supply system, a main pneumatic line of the system includes an air dryer to dry the compressed air.This ensures that the consumer receives dry compressed air at the compressed air supply connection and prevents moisture accumulation within the consumer unit. Moisture can lead to valve-damaging crystal formation and other undesirable defects, especially at relatively low temperatures. An air dryer contains a desiccant, typically desiccant granules, through which the compressed air flows in such a way that the desiccant granules can absorb the moisture contained in the compressed air through adsorption. An air dryer can also be designed as a regenerative air dryer. This can be achieved by passing compressed air from a reservoir or the air springs through the desiccant granules – usually in counterflow, but sometimes also in parallel flow relative to the filling direction.
[0008] If the consumer and the compressed air supply system form a closed compressed air supply, the compressed air returned from the consumer is usually used for regeneration.
[0009] In compressed air supply systems for sensor cleaning devices and brake systems, the challenge lies in the fact that the compressed air supplied at the compressed air connection cannot be returned to the compressed air supply system but is used to clean the sensors. Thus, unlike known compressed air supply systems, such as those shown in DE102017010772 A1, no compressed air already dried by the air dryer remains in the compressed air supply system or pneumatic system for regeneration. For this reason, consumers with open compressed air supplies, such as sensor cleaning devices or signal horns, are often supplied by compressed air supply systems without an air dryer.
[0010] In compressed air supply systems that serve both open and closed-loop consumers, a challenge arises: when supplying consumers with open-loop systems, the saturation of the air dryer is accelerated significantly without any compressed air being returned for its regeneration. Consequently, the operating time of compressed air supply systems serving two or more consumers with both open and closed-loop systems is considerably reduced.
[0011] For example, WO0176898A1 shows a single-stage compressor with an attached air suspension system and a connected tire inflation system. When the tire inflation system is supplied with moist compressed air from the compressor, moist compressed air is also pumped to the air dryer, thus accelerating the saturation of the air dryer.
[0012] This is where the invention comes in, the object of which is to provide a compressed air supply system that overcomes at least one of the disadvantages known from the prior art. In particular, the object of the present invention is to increase the operating time of compressed air supply systems for supplying two or more consumers that not only return compressed air to the compressed air supply system but also discharge it into the environment.
[0013] The problem is solved in a first aspect of the invention by a compressed air supply system according to claim 1.
[0014] In particular, the invention proposes a switchable air dryer protection valve arrangement designed to at least selectively disconnect the compressed air supply line from the air dryer. By selectively disconnecting the air dryer from the supply line, the compressed air from the compressor is directed either to the supply line or to the air dryer as needed. This selective disconnection of the supply line and the air dryer prevents compressed air intended for the supply line from unintentionally entering the air dryer and accelerating its saturation. The air dryer is thus used only when dry compressed air is required at the main compressed air supply connection to supply the primary consumer. Such an air dryer protection valve arrangement can comprise one or more valves and other, preferably pneumatic, switching elements.The air dryer protection valve arrangement enables demand-based distribution of compressed air from the compressor to the supply line and the pneumatic main line with the air dryer, whereby the air dryer is only used for drying compressed air as required.
[0015] Further developments of the invention are specified in the dependent claims, which further develop the concept of the invention with regard to advantageous features within the scope of the problem statement and with regard to further advantages.
[0016] Preferably, the air dryer protection valve assembly includes a switchable air dryer protection valve arranged in the pneumatic main line, which is configured to selectively block and release the pneumatic main line between the main compressed air connection and the air dryer. Thus, compressed air only flows from the main compressed air connection to the air dryer when the air dryer protection valve releases the pneumatic main line.
[0017] Preferably, the supply line branches off from the main pneumatic line at a junction point, and the air dryer protection valve is designed as a 2 / 2-way valve and arranged between the junction point and the air dryer. The 2 / 2-way valve is preferably configured to selectively block and release the main pneumatic line between the junction point and the air dryer. A suitably arranged 2 / 2-way valve ensures that the flow of compressed air from the main compressed air connection into the supply line is not obstructed. At the same time, it reliably prevents compressed air from the main compressed air connection from entering the air dryer for drying, in case no dry compressed air is available at the main compressed air supply connection.
[0018] It is further preferred that the air dryer protection valve assembly includes a switchable secondary circuit shut-off valve designed as a 2 / 2-way valve and arranged in the supply line, which is configured to selectively open and close the supply line. This improves the overall efficiency of the compressed air supply system, as compressed air is only supplied through the entire supply line as needed, and in cases where the auxiliary consumer does not require compressed air, only a limited volume of the supply line up to the secondary circuit shut-off valve is filled. This also prevents pressure fluctuations within the auxiliary consumer from affecting the compressed air supply system or from affecting the operation of the auxiliary consumer due to pressure fluctuations in the compressed air supply system.Furthermore, it prevents moist compressed air directed to the auxiliary consumer from reaching the air dryer.
[0019] According to an alternative preferred embodiment, the supply line branches off from the main pneumatic line at a junction point, with the air dryer protection valve being designed as a 3 / 2-way valve and arranged at the junction point. For the purposes of this document, "arranged at the corresponding junction point" also means that the 3 / 2-way valve itself forms the junction point, i.e., the junction point is part of the 3 / 2-way valve. Preferably, the 3 / 2-way valve is configured to at least selectively isolate the supply line from the air dryer for the flow of compressed air and to selectively block and release the main pneumatic line between the main compressed air connection and the air dryer. Thus, no compressed air from the supply line reaches the air dryer. Compressed air intended for supplying the auxiliary consumer therefore does not contribute to the saturation of the air dryer.At the same time, with just one such valve it is also possible to control the selective compressed air supply from the main compressed air connection to the air dryer by selectively blocking and releasing the main pneumatic line.
[0020] Preferably, the compressor has a first compressor stage for compressing compressed air to a first pressure level and a second compressor stage for compressing the compressed air to a second pressure level, which is higher than the first pressure level.
[0021] According to a further preferred embodiment, the first compressor stage has a first inlet and a first outlet connected to an intake port or a combined intake and exhaust port, and the second compressor stage has a second outlet connected to the main pneumatic line and a second inlet connected to the first outlet via a section of pipe. This is thus a two-stage compressor in which compressed air passes sequentially through the first and second compressor stages. In the first compressor stage, compressed air is preferably pre-compressed to a first pressure level and then passes through the pipe section into the second compressor stage, where the compressed air is preferably compressed to a second pressure level, i.e., a target pressure level. Such compressors are also referred to as twin compressors.
[0022] Preferably, the compressed air supply system further comprises a compressor switching valve designed to selectively block and release the section of pipe. This allows the first compressor stage to be isolated from the second compressor stage as needed. It is therefore possible to supply compressed air to an auxiliary consumer at the first outlet of the first compressor stage, while no compressed air from the first compressor stage reaches the second compressor stage. Accordingly, no compressed air at the second compressed air level can be supplied via the second outlet of the second compressor stage and fed into the main pneumatic line via the main compressed air connection. The first compressor stage can thus be operated independently of the second compressor stage and used to supply compressed air.
[0023] Preferably, the compressor switching valve is a 2 / 2-way compressor valve, which is preferably normally closed and electrically or pneumatically actuated. In the case of a pneumatically actuated 2 / 2-way compressor valve, it is preferably actuated by a control pressure taken from the outlet side of the first compressor stage, i.e., a control pressure taken from the first outlet of the first compressor stage.
[0024] Preferably, the 3 / 2-way valve of the air dryer protection valve assembly is a pneumatically actuated 3 / 2-way valve, which can be actuated by a control pressure taken from the outlet side of the first compressor stage and / or from a boost line connected to a reservoir. Alternatively, the 3 / 2-way valve is preferably an electrically actuated, normally closed 3 / 2-way valve.
[0025] Electrically actuated valves have the advantage of short response times. Pneumatically actuated 2 / 2-way or 3 / 2-way valves, on the other hand, have the advantage that greater actuating forces are exerted by the control pressure. If, due to moisture present upstream of the air dryer in the filling direction, crystal formation occurs in the pneumatic main line and the supply line at sub-zero temperatures, higher actuating forces ensure trouble-free operation.
[0026] Preferably, the compressed air supply system includes a water collection volume between the main compressed air connection and the air dryer protection valve assembly. The water collection volume is thus located in the pneumatic main line, i.e., a moist section of the main line extending upstream of the air dryer in the filling direction. The water collection volume is preferably located at the lowest point of this section of the pneumatic main line between the main compressed air connection and the air dryer protection valve assembly. Preferably, the water collection volume is connected to the supply line in such a way that compressed air can be discharged from the water collection volume via the supply line and released into the environment via the auxiliary consumer. The water collection volume is preferably sized such that the amount of water collected in it is conveyed through the supply line along with the compressed air supplied by the compressor.
[0027] Preferably, the auxiliary consumer is a first auxiliary consumer. More preferably, the compressed air supply system has an auxiliary compressed air connection connected to the first compressor stage and a second auxiliary compressed air supply connection for supplying the compressed air compressed by the first compressor stage, wherein the auxiliary compressed air supply connection is configured for connecting a second auxiliary consumer. Thus, two auxiliary consumers and one main consumer can be supplied with compressed air via the compressed air supply system. Because the second auxiliary consumer is supplied with compressed air from the first compressor stage via the second auxiliary compressed air supply connection, and the first auxiliary consumer is supplied with compressed air from the second compressor stage, compressed air at different pressure levels can be provided to the first and second auxiliary consumers.In the case of a twin compressor, the compressed air supplied by the second compressor stage is pressurized, i.e., it has a higher pressure level than the compressed air compressed and supplied by the second compressor stage. Preferably, the compressed air supply system includes a reservoir, a boost line connected to the reservoir, and a filling valve designed for selectively closing and opening the boost line. Even more preferably, one or the second auxiliary compressed air supply connection is connected to the auxiliary compressed air connection via the boost line. Thus, compressed air can be supplied from the reservoir to the second compressor stage via the boost line, and compressed air can also be supplied from the first compressor stage to the second auxiliary consumer via the second auxiliary compressed air supply connection.
[0028] The invention solves the aforementioned problem in a second aspect by means of a pneumatic system according to claim 11.
[0029] In particular, the invention proposes that the pneumatic system comprises a compressed air supply system according to the first aspect of the invention, a main consumer connected to the main compressed air supply port, and an auxiliary consumer connected to the auxiliary compressed air supply port. Such a pneumatic system, through the existing compressed air supply system, benefits from the advantages described above in relation to the first aspect of the invention. Advantages and preferred embodiments according to the first aspect of the invention are therefore also advantages and preferred embodiments according to the second aspect of the invention, and vice versa.
[0030] Preferably, the main consumer is configured to form a closed compressed air supply with the compressed air supply system, such that compressed air is supplied to the main consumer to actuate a number of main actuators and compressed air is returned to the compressed air supply system to vent the main actuators.
[0031] Because the main consumer operates with a closed compressed air supply, the compressed air dried by the air dryer is not lost but can be reused to regenerate the air dryer. A suitably designed pneumatic system thus enables increased operating time for the air dryer with a limited volume. Preferably, the secondary consumer is configured to provide an open compressed air supply to the compressed air supply system, such that compressed air is supplied to the secondary consumer to actuate a number of secondary actuators and is then discharged by the secondary consumer into the surrounding environment. This allows the pneumatic system to operate efficiently, as the secondary consumer does not receive dried compressed air to be discharged into the environment.The air dryer is therefore not burdened by the provision of compressed air, which is thus lost through release to the environment, and its saturation is accelerated.
[0032] In preferred embodiments, the main consumer is an air suspension system and / or the secondary consumer is a sensor cleaning device or a tire inflation system or a horn or a braking system.
[0033] The invention solves the aforementioned problem in a third aspect by means of a vehicle according to claim 15.
[0034] In particular, the invention proposes that such a vehicle has a pneumatic system according to the second aspect of the invention. By means of such a pneumatic system, the vehicle benefits from the advantages described in relation to the first and second aspects of the invention. Advantages and preferred embodiments according to the first and second aspects of the invention are thus also preferred embodiments and advantages according to the third aspect of the invention.
[0035] The invention solves the aforementioned problem in a fourth aspect by means of a method according to claim 16.
[0036] In particular, the invention proposes a method for operating a pneumatic system, especially a pneumatic system according to the second aspect of the invention, which comprises the steps:
[0037] Compressing compressed air using a compressor,
[0038] Providing compressed air at a main compressed air connection, routing the provided compressed air from the main compressed air connection to a main compressed air supply connection via a pneumatic main line and an air dryer,
[0039] Routing (undried) compressed air from the main compressed air connection to a secondary compressed air supply connection via a supply line that branches off from the main pneumatic line at a junction point,
[0040] Supplying compressed air to an auxiliary consumer connected to the secondary compressed air supply connection,
[0041] Supplying compressed air to a main consumer connected to a main compressed air supply connection, at least selectively separating the air dryer from the supply line for the flow of compressed air.
[0042] By at least selectively separating the air dryer from the compressed air supply line, the method takes advantage of the benefits described above in relation to the first aspect of the invention. Advantages and preferred embodiments described in relation to the first and second aspects of the invention are also preferred embodiments of the method according to the fourth aspect of the invention.
[0043] Embodiments of the invention are now described below with reference to the drawings and comparison with the prior art, some of which is also shown. These drawings are not necessarily to scale; rather, where explanatory, they are presented in a schematic and / or slightly distorted form. For further details regarding the teachings directly apparent from the drawings, reference is made to the relevant prior art. It should be noted that numerous modifications and changes concerning the form and details of an embodiment can be made without deviating from the general idea of the invention. The features of the invention disclosed in the description, the drawings, and the claims can be essential for the further development of the invention, both individually and in any combination.Furthermore, the invention encompasses all combinations of at least two of the features disclosed in the description, the drawing, and / or the claims. The general idea of the invention is not limited to the exact shape or detail of the preferred embodiment shown and described below, nor is it limited to an object that would be restricted compared to the object claimed in the claims. Where specified dimensioning ranges are given, values lying within the stated limits are also disclosed as limit values and may be used and claimed as desired.
[0044] 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:
[0045] FIG. 1 : a vehicle with a pneumatic system schematically in a first embodiment;
[0046] FIG. 2: a vehicle with a pneumatic system schematically in a second embodiment;
[0047] FIG. 3: a vehicle with a pneumatic system schematically in a third embodiment;
[0048] FIG. 4: a vehicle with a pneumatic system schematically in a fourth embodiment;
[0049] FIG. 5: a section of the pneumatic system according to FIG. 1;
[0050] FIG. 6: A method for operating a pneumatic system according to FIG. 1 to FIG. 4.
[0051] FIG. 1 shows a vehicle 1000, which may preferably be a passenger car 1100.
[0052] The vehicle 1000 comprises a pneumatic system 10 with a compressed air supply system 100 for providing compressed air D, D' and a main consumer 300, as well as at least one auxiliary consumer 400 for drawing off the compressed air D, D'. The compressed air supply system 201 comprises a compressor 101 for compressing moist compressed air D and a compressed air supply unit 201 for delivering the compressed compressed air D, D' to the main consumer 300 and the auxiliary consumer 400.
[0053] The compressed air supply system 201 comprises a main compressed air connection 1 for connection to the compressor 101 and a main compressed air supply connection 2.1, which is configured for connecting the main consumer 300. Dried compressed air D' is supplied to the main consumer 300 at the main compressed air supply connection 2.1.
[0054] The compressed air supply system 201 also includes an auxiliary compressed air supply connection 2.2, which is configured for connecting the auxiliary consumer 400. The compressed air supply system 201 is configured to provide compressed, moist compressed air D at the auxiliary compressed air supply connection 2.2 for the auxiliary consumer 400.
[0055] Furthermore, the compressed air supply system 201 includes a combined intake and exhaust connection 0 / 3. It should be understood that the compressed air supply system 201 can alternatively also include two separate connections: one for venting the compressed air supply system (namely an exhaust connection) and one for drawing compressed air for the compressor (namely an intake connection). Such connections for compressed air supply systems are known.
[0056] The intake and vent connection 0 / 3 is connected to the compressor 101 via an intake line 213 of the compressed air supply system 201.
[0057] Preferably, a first compressor stage 110 is configured with a first inlet 111 for connection to the intake line 213. The first compressor stage 110 compresses the aspirated moist compressed air D preferably to a first pressure level D1 and provides this compressed air at a first outlet 112. The compressor 101 shown in FIG. 1 is a so-called twin compressor. This is a preferred embodiment, which is not to be understood as limiting. The compressed air supply system according to the invention can also be operated with a compressor with only one compressor stage or with three or more compressor stages. In the case of a twin compressor, the compressed air D, compressed to the first pressure level D1, is fed from the first outlet 112 of the first compressor stage 110 to a second compressor stage 120. The second compressor stage 120 has a second inlet 121 and a second outlet 122.The first outlet 112 is connected via a pipe section 140 to the second inlet 121 of the second compressor stage 120. The second compressor stage 120 is configured to compress the moist compressed air D, compressed to the first pressure level D1, to a second pressure level D2 and supply it at the second outlet 122. The first compressor stage 110 and the second compressor stage 120 are preferably driven by a motor 130. The moist compressed air D, compressed to the second pressure level D2, is supplied to the compressed air supply system 201 at the main compressed air connection 1.
[0058] The compressed air supply system 201 comprises a pneumatic main line 210 for conveying the compressed air D supplied at the main compressed air connection 1 to the main compressed air supply connection 2.1. The compressed air supply system 201 also includes an air dryer 220 arranged in the pneumatic main line 210, which is configured to dry the moist compressed air D supplied from the main compressed air connection 1 to the air dryer 220, so that dry compressed air D' is supplied at the main compressed air supply connection 2.1. Due to compression by means of the second compressor stage 120, the dry compressed air D' supplied at the main compressed air supply connection 2.1 has the second compressed air level D2. The compressed air D, D' is conveyed in a filling direction B from the main compressed air connection 1 to the main compressed air supply connection 2.1. The pneumatic main line 210 is subdivided into a wet main line section 210.1 , which is designed downstream of the air dryer in the filling direction B, and a dry main line section 210.2, which is designed upstream of the air dryer 220 in the filling direction B.
[0059] In the filling direction B downstream of the air dryer 220, a throttle 230 is also arranged, which is designed to reduce the relative humidity of the compressed air by expanding it. The compressed air supply system 201 further comprises a supply line 251 for conveying the compressed air D provided at the main compressed air connection 1 to a secondary compressed air supply connection 2.2 of the compressed air supply system 201. The secondary compressed air supply connection 2.2 is designed such that an auxiliary consumer 400 can be connected to it.
[0060] The supply line 251 branches off at a junction Z between the main compressed air connection 1 and the air dryer 220, i.e. from the moist main line section 210.1 of the pneumatic main line 210.
[0061] Furthermore, the compressed air supply system 201 includes a switchable air dryer protection valve assembly 270, which is configured to at least selectively disconnect the supply line 251 from the air dryer 220, thus preventing the flow of compressed air D. In other words, the air dryer protection valve assembly 270 is configured to prevent the flow of compressed air D, intended to supply the auxiliary consumer 400, to the air dryer 220. By appropriately disconnecting the supply line 251 from the air dryer 220, compressed air D from the main compressed air connection 1 can, in at least one switching state of the air dryer protection valve assembly 270, either flow into the supply line 251 or to the air dryer 220, since a connection between the supply line 251 and the air dryer 220 that would allow the flow of compressed air D is severed.
[0062] The compressed air supply system 201 further comprises a venting valve arrangement 260, which is designed to allow venting of the main consumer 300 and the compressed air supply system 201, in particular the pneumatic main line 210, via the combined intake and venting connection 0 / 3.
[0063] Furthermore, the water collection volume 211 can also be vented via the auxiliary circuit shut-off valve 274 to assist in starting the compressor 101, allowing it to start without pressure. Additionally, it is also possible for the compressed air D to be depressurized by a further restrictor (not shown) as it passes through the supply line 251.
[0064] The main consumer 300, together with the compressed air supply system 100, forms a closed compressed air supply G. To vent the main consumer 300, compressed air is returned to the main pneumatic line 210 and conveyed to the air dryer 220 against the filling direction B. The compressed air returned against the filling direction B is first depressurized by the throttle 230, thus reducing its relative humidity. As this depressurized compressed air is returned through the air dryer 220, moisture is bound from a drying granulate within the air dryer 220, thereby regenerating the air dryer 220.In the filling direction B upstream of the air dryer 220, a vent line 216 branches off from the main pneumatic line 210, in particular the wet main line section 210 of the main pneumatic line 210, and is configured to direct the compressed air returned by the air dryer 220 against the filling direction B via the vent valve assembly 260 towards the combined intake and vent connection 0 / 3. The vent line 216 connects to the intake line 213. The vent valve assembly 260 includes a relay valve 261, which is configured to selectively block and release the vent line 216. The relay valve 261 is actuated via a compressor pilot valve 262. Such vent valve assemblies 260 are known and are not described in detail here.
[0065] In alternative embodiments, it can also be a pneumatically actuated 2 / 2-way valve, whereby greater opening forces can be applied through pneumatic actuation. This enables actuation even in the event of crystal formation due to ambient temperatures below freezing, thus ensuring reliable operation.
[0066] As can be seen in particular in FIG. 5, the vent line 216 branches off from the wet main line section 210 of the pneumatic main line 210 at a vent branch point E.
[0067] It is further preferred that the pneumatic system 10 comprises a reservoir unit 280. The reservoir unit 280 is configured to provide compressed air for the additional charging of the second compressor stage 120. Such charging of the second compressor stage 120 is also referred to as boosting. The reservoir unit 280 has a reservoir 281, which in this case is part of the compressed air supply system 201. Alternatively or additionally, it can also be a reservoir of the main consumer 300.
[0068] Reservoir 281 is connected to the second inlet 121 of the second compressor stage 120 via a boost line 282. The boost line 282 preferably connects to the pipe section 140. A filling valve 283 is preferably arranged in the boost line 282, which is configured to selectively close and open the boost line 282.
[0069] The air dryer protection valve arrangement 270 has a switchable air dryer protection valve 271 arranged in the pneumatic main line 210, as shown in FIG. 1.
[0070] The air dryer protection valve 271 is preferably arranged between the main compressed air connection 1 and the air dryer 220, i.e., the wet main line section 210.1 of the pneumatic main line 210. The air dryer protection valve 271 is configured to selectively block and release the pneumatic main line 210 between the main compressed air connection 1 and the air dryer 220. When the air dryer protection valve 271 blocks the pneumatic main line 210, the air dryer 220 is thus isolated from the supply line 251 with respect to the flow of compressed air D. The compressed air D supplied at the compressed air connection 1 can therefore be conveyed exclusively into the supply line 251, with a negligible portion of the compressed air D remaining in the pneumatic main line within a volume of pipe between the air dryer protection valve 271 and the main compressed air connection 1.
[0071] The air dryer protection valve 271 is preferably designed as a 2 / 2-way valve 272. The air dryer protection valve 271, designed as a 2 / 2-way valve 272, selectively blocks and opens the pneumatic main line 210 between branch point Z and the air dryer 220. The 2 / 2-way valve 272 is preferably electrically actuated. In alternative embodiments, it can also be pneumatically actuated, whereby greater opening forces can be applied through pneumatic actuation. This enables actuation even in the event of crystal formation, which can occur as a result of ambient temperatures below freezing. Thus, reliable operation is ensured.
[0072] Furthermore, the air dryer protection valve arrangement 270 preferably comprises a switchable secondary circuit shut-off valve 274 arranged in the supply line 251. The secondary circuit shut-off valve 274 is configured to selectively shut off and release the supply line 251. The secondary circuit shut-off valve 274 is also preferably a 2 / 2-way valve 272.
[0073] A water collection volume 211 is preferably provided between the main compressed air connection 1 and the protective valve arrangement 270, which is shown in detail in FIG. 5.
[0074] The main consumer 300 is preferably an air spring system 301. The air spring system 301 comprises a gallery 313 connected to the main compressed air supply connection 2.1, to which a number of main actuators 320 are connected. The main actuators 320 are preferably air spring bellows 321, 322, 323, 324, which are connected to the gallery 313 via a main consumer valve arrangement 330. The main consumer valve arrangement 330 comprises a number of main consumer switching valves 331, 332, 333, 334, wherein each main consumer switching valve 331, 332, 333, 334 is assigned to a corresponding air spring bellows 321, 322, 323, 324. The main consumer switching valves 331, 332, 333, 334 shown are configured to act as a check valve in the first switching position S1 shown and to allow an exclusively unidirectional compressed air flow from the gallery 313 to the main actuators 320.In a second switching position not shown, the main consumer switching valves 331, 332, 333, 334 are configured to allow a bidirectional compressed air flow between the gallery 313 and the main actuators 320.
[0075] The term "switching valve" or "pneumatically switchable element" refers to a pneumatic element that can switch between at least two switching states, either through controlled actuation (e.g., electrical or pneumatic actuation) or autonomously. Examples include 2 / 2-way valves, 3 / 2-way valves, and check valves. Check valves automatically switch from a closed position, where bidirectional compressed air flow is impossible, to a release position, where only unidirectional compressed air flow is possible, by applying an opening pressure. The opening pressure must be applied to the inlet side of the check valve, allowing compressed air to flow from the inlet side to the outlet side in the release position.
[0076] Furthermore, the main consumer 300 comprises a switchable gallery valve 350 arranged between gallery 313 and the main compressed air supply connection 2.1, which is configured to act as a check valve in the first switching position S1 shown and to allow exclusively unidirectional compressed air flow into gallery 313. In a second switching position (not shown), the gallery valve 350 is configured to allow bidirectional compressed air flow between gallery 313 and the main compressed air supply connection 2.1.
[0077] Furthermore, the main consumer 300 includes a pressure sensor 360 connected to the gallery 313, which is configured to detect a gallery pressure DG. This gallery pressure DG can preferably be used as a control signal for controlling the gallery valve 350 or the main consumer valve assembly 330.
[0078] The auxiliary consumer 400 preferably forms an open compressed air supply O with the compressed air supply system 100. Compressed air D is conveyed from the main compressed air connection 1 via the supply line 251 to the auxiliary consumer 400, which then releases the compressed air D to the environment A via auxiliary consumer switching valves 420, 430 for the actuation of auxiliary actuators (not shown). The auxiliary consumer switching valves 420, 430 are connected to the auxiliary compressed air supply connection 2.2 via a common supply line 410.
[0079] The auxiliary actuators are preferably cleaning nozzles of a sensor cleaning device 401. The auxiliary consumer switching valves 420, 430 are shown here in a blocked position SP, in which the supply line 410 is blocked. In the second switching position (not shown), the auxiliary consumer switching valves 420, 430 release the supply line 410, and the compressed air D supplied at the auxiliary consumer compressed air supply connection 2.2 is supplied to the cleaning nozzles (not shown) of the sensor cleaning device 401 and discharged via these to the environment A. It should be understood that both the air spring system 301 and the sensor cleaning device 401 are merely examples of main consumers 300 and auxiliary consumers 400, which are not to be interpreted restrictively.
[0080] FIG. 2 shows a second embodiment of the vehicle 1000 and, in particular, of the compressed air supply system 202. Identical or similar components have identical reference numerals, and only differences between the compressed air supply system 201 according to FIG. 1 and the compressed air supply system 202 according to FIG. 2 are discussed.
[0081] The air dryer protection valve assembly 270 of the compressed air supply system 202 has only one air dryer protection valve 271', omitting the secondary circuit shut-off valve 274 shown in FIG. 1. The air dryer protection valve 271' of the air dryer protection valve assembly 270 combines the function of the secondary circuit shut-off valve 274 and the air dryer protection valve 271 shown in FIG. 1. The air dryer protection valve 271' is designed as a 3 / 2-way valve 273 and is located at the branch point Z.
[0082] The 3 / 2-way valve 273 is configured to disconnect the supply line 251 from the air dryer 220 for the flow of compressed air D. Furthermore, the 3 / 2-way valve is configured to selectively block and release the pneumatic main line 210 between the main compressed air connection 1 and the air dryer 220, i.e., the wet main line section 210.1 of the pneumatic main line 210. The 3 / 2-way valve 273 connects as shown in FIG. In the first switching position shown, the main compressed air connection 1 is connected to the supply line 251 and the main compressed air connection 1 is disconnected from the part of the pneumatic main line 210 running downstream of the 3 / 2-way valve 273 in the filling direction B. In a second switching position (not shown), the supply line 251 is disconnected from the main compressed air connection 1 and the part of the pneumatic main line 210 running downstream of the filling direction B is connected to the main compressed air connection 1 via the 3 / 2-way valve.A compressed air flow between the supply line 251 and the pneumatic main line 210 in filling direction B downstream of the air dryer protection valve 271' is therefore not possible and is permanently blocked.
[0083] The 3 / 2-way valve 273 in FIG. 2 is an electrically actuated 3 / 2-way valve.
[0084] Branch point Z is thus formed by the air dryer protection valve 271, which is a 3 / 2-way valve 273. Branch point Z is located at the same position as the main pneumatic line 210, where the air dryer protection valve 271 is located.
[0085] FIG. 3 shows a third embodiment of the vehicle 1000 and, in particular, the compressed air supply system 203. Identical or similar components have identical reference numerals in FIGS. 1, 2, and 3. Reference is made here to the comprehensive description of the pneumatic system 10 according to FIGS. 1 and 2, and only the differences between the compressed air supply system 202 according to FIG. 2 and the compressed air supply system 203 according to FIG. 3 are discussed.
[0086] The air dryer safety valve 271' of the compressed air supply system 203 is designed as a pneumatically actuated 3 / 2-way valve 273'. The pneumatically actuated 3 / 2-way valve 273' is actuated via a safety valve assembly control valve 275. The safety valve assembly control valve 275 is connected to the reservoir 281 via an actuation supply line 276 and the boost line 282. For actuation, compressed air from the reservoir 281 is supplied to the pneumatically actuated 3 / 2-way valve 273' via the safety valve assembly control valve 275. The 3 / 2-way valve 273' is connected to an outlet of the safety valve assembly control valve 275 via a control line 278.
[0087] The branch point Z is thus formed by the air dryer protection valve 271', which is a 3 / 2-way valve 273'. The branch point Z is located at the same position as the main pneumatic line 210, where the air dryer protection valve 271' is located. In the first switching position shown in FIG. 3, the protection valve arrangement control valve 275 is configured to connect the pneumatically actuated 3 / 2-way valve 273' to the vent line 216 via a valve vent line 277. In this way, the 3 / 2-way valve 273' can be vented to the environment A via the combined intake and vent port 0 / 3. In the position shown in FIG. In the second switching position of the protective valve arrangement control valve 275 (not shown), it is configured to connect the reservoir 281 to the 3 / 2-way valve 273' for its actuation.
[0088] FIG. 4 shows a fourth embodiment of the vehicle 1000 and, in particular, of the pneumatic system 11. Identical or similar components have identical reference numerals, and reference is made here to the description of the pneumatic system 10 according to FIG. 1 and FIG. 2. The pneumatic system 11 according to FIG. 4 differs from the pneumatic system 10 according to FIG. 2 in the design of the connection of the reservoir unit 280, the number of auxiliary consumers 400, 500, and the corresponding number of auxiliary consumer supply connections 2.2, 2.3, as well as the different auxiliary consumer pressure levels.
[0089] In FIG. 4, the boost line 282 for connecting the reservoir 281 is divided into a first boost line section 282.1 and a second boost line section 282.2. The filling valve 283 is located in the second boost line section 282.2. The first boost line section 282.1 is connected to the second compressor stage 120 via the line section 140.
[0090] The compressed air supply system 201 comprises, in addition to the main compressed air connection 1.1, a secondary compressed air connection 1.2. Compressed air D, which has been compressed by the first compressor stage 110 to the first pressure level D1, is supplied via the secondary compressed air connection 1.2. The first boost line section 282.1 is connected to the secondary compressed air connection 1.2.
[0091] The branch point Z is, in this case, a first branch point Z, and the supply line 251.1 branching off from the first branch point Z is, in this case, a first supply line 251.1. The first branch point Z is formed by the air dryer protection valve 271', which is a 3 / 2-way valve 273. The first branch point Z is located at the same position as the main pneumatic line 210, where the air dryer protection valve 271' is located.
[0092] Furthermore, the compressed air supply system 204 of the pneumatic system 11 according to FIG. 4 comprises a second branch point Z2, at which a second supply line 251.2 branches off from the first boost line section 282.1. Compressed air D is conveyed via the first boost line section 282.1 and the second supply line 251.2 from the auxiliary compressed air connection 1.2 to a second auxiliary compressed air supply connection 2.3. A pneumatic switching element 211 is preferably arranged in the second supply line 251, which is configured to selectively block and release the second supply line 251.1.
[0093] Preferably, a switchable limiting valve 286 is arranged in the first boost line section 282.1, which is configured to selectively block and release the first boost line section 282.1. This limits the volume of the first boost line section 282.1 into which compressed air D can flow via the secondary compressed air connection 1.2.
[0094] The auxiliary consumer 400 is, in this case, a first auxiliary consumer 400. A second auxiliary consumer 500 is also connected to the second auxiliary compressed air supply connection 2.3. This second auxiliary consumer 500 is preferably one that forms an open compressed air supply O with the compressed air supply system 100. That is, an auxiliary consumer that discharges the compressed air supplied via the second auxiliary compressed air supply connection 2.3 to the environment. The second auxiliary consumer 500 is preferably a signal horn 501 or a tire inflation system 502.
[0095] As can be seen in the section of the compressed air supply system 100 according to FIG. 5, the water collection volume 211 is designed to collect moisture, particularly in the form of condensate, which forms between the main compressed air connection 1 and the air dryer protection valve assembly 270. The supply line 251 branches off from the main pneumatic line 210 at the branch point Z in such a way that the condensate K collected in the water collection volume 211 is fed into the supply line 251 and discharged via the auxiliary consumer 300. The water collection volume 211 is thus adapted so that the amount of condensate K that can be collected in the water collection volume 211 can be carried to the (first) auxiliary compressed air supply connection 2.2 by the compressed air D conveyed to the auxiliary consumer 400. The condensate K collected in the water collection volume 211 therefore does not place an additional load on the air dryer 220.
[0096] FIG. 6 shows a method 2000 for operating a pneumatic system 10, in particular a pneumatic system 10 according to FIG. 1 to FIG. 5.
[0097] The process 2000 comprises, in a first step 2100, the compression of compressed air D by a compressor 101.
[0098] The procedure 2000 includes, in a first step 2200, the provision of compressed air D at a main compressed air connection 1.1.
[0099] Furthermore, in a third step, the procedure 2000 includes at least selectively separating the air dryer 220 from the supply line 251 for the flow of compressed air D.
[0100] In a fourth step 2400, the procedure 2000 includes the routing of compressed air D from the main compressed air connection 1.1 to a main compressed air supply connection 2.1 via a pneumatic main line 210 and an air dryer 220.
[0101] Furthermore, in a fifth step 2500, the method 2000 comprises the routing of compressed air D from the main compressed air connection 1.1 to a secondary compressed air supply connection 2.2 via a supply line 251, which branches off from the main pneumatic line 210 at a junction Z, and in a sixth step 2600 the supply of compressed air D to a main consumer 300 connected to a main compressed air supply connection 2.1. In a seventh step 2700, the method 2000 comprises the supply of compressed air D to a secondary consumer 400 connected to the secondary compressed air supply connection 2.2.
[0102] It should be understood that the steps of the procedure can also be carried out in parallel, in a different order, or repeatedly.
[0103] In summary, the invention relates to a compressed air supply system 100, comprising: a compressor 101, a compressed air supply system 201 with a main compressed air connection 1.1 for connection to the compressor 101, a main compressed air supply connection 2.1 and a secondary compressed air supply connection 2.2, a pneumatic main line 210 with an air dryer 220 for drying and conveying compressed air D from the main compressed air connection 1.1 to the main compressed air supply connection 2.1, a supply line 251 for conveying compressed air D to the secondary compressed air supply connection 2.2, which branches off from the pneumatic main line 210 between the main compressed air connection 1.1 and the air dryer 220, wherein the main compressed air supply connection 2.1 is for connecting a main consumer 300 and the secondary compressed air supply connection 2.2 is set up for connecting an auxiliary consumer 400.The invention proposes a switchable air dryer protection valve arrangement 270 for at least selectively disconnecting the supply line 251 from the air dryer 220. The invention further relates to a pneumatic system 10 with a compressed air supply system, a vehicle 1000 with the same, and an operating method 2000.
[0104] Other variations of the disclosed embodiments can be understood and carried out by a person skilled in the art when carrying out the claimed invention with reference to the drawings, the disclosure and the accompanying claims.
[0105] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "on" does not exclude multiple elements. A single unit or device can perform the functions of several elements listed in the claims. The fact that certain measures are listed in different interdependent claims does not mean that a combination of these measures cannot be advantageous.
[0106] Any reference numerals in the claims are not to be understood as limiting the scope of application.
[0107] List of reference symbols (part of the description)
[0108] 1, 1.1 Main compressed air connection
[0109] 1.2 Auxiliary compressed air connection
[0110] 2.1 Main compressed air supply connection
[0111] 2.2 Auxiliary compressed air supply connection
[0112] 2.3 Auxiliary compressed air supply connection
[0113] 10, 11 pneumatic system
[0114] 100 compressed air supply system
[0115] 101 compressors
[0116] 110 first compressor stage
[0117] 111 first admission
[0118] 112 first outlet
[0119] 120 second compressor stage
[0120] 121 second entrance
[0121] 122 second outlet
[0122] 130 engine
[0123] 140 cable section
[0124] 201-204 Compressed air supply system
[0125] 210 Pneumatic main line
[0126] 210.1 damp main line section
[0127] 210.2 dry main line section
[0128] 211 Water collection volume
[0129] 213 Intake pipe
[0130] 216 Vent line
[0131] 220 air dryers
[0132] 230 throttle
[0133] 250 pneumatic switching element
[0134] 251.1 (first) supply line
[0135] 251.2 second supply line
[0136] 260 Vent valve arrangement
[0137] 261 Relay valve
[0138] 262 Compressor pilot valve
[0139] 270 Air dryer protection valve assembly 271 Air dryer protection valve
[0140] 272 2 / 2-way valve
[0141] 273 Electrically operated 3 / 2-way valve
[0142] 273' pneumatically actuated 3 / 2-way valve
[0143] 274 Sub-circuit shut-off valve
[0144] 275 Protective valve arrangement control valve
[0145] 276 Actuating supply line
[0146] 277 Valve vent line
[0147] 281 Reservoir
[0148] 282 Boost line
[0149] 282.1 first boost line section
[0150] 282.2 second boost line section
[0151] 283 Filling valve
[0152] 286 Limiting valve
[0153] 290 Compressor switching valve
[0154] 291 Electrically operated 2 / 2-way compressor valve
[0155] 300 main consumers
[0156] 301 Air suspension system
[0157] 302 Brake system
[0158] 313 Gallery
[0159] 320 main actuators
[0160] 321-324 Air springs
[0161] 330 Main consumer valve arrangement
[0162] 331-334 Main consumer switching valves
[0163] 350 gallery valve
[0164] 360 pressure sensor
[0165] 400 (first) secondary consumers
[0166] 401 Sensor cleaning device
[0167] 410 Supply line
[0168] 420, 430 Auxiliary consumer switching valves
[0169] 500 second secondary consumers
[0170] 501 Tire inflation system
[0171] 502 Signal horn
[0172] 1000 vehicles, 1100 commercial vehicles
[0173] 2000 procedures
[0174] 2100 Compressing compressed air
[0175] 2200 Providing compressed air
[0176] 2300 at least selective separation
[0177] 2400 Routing compressed air to the main compressed air supply connection
[0178] 2500 Routing compressed air to the secondary compressed air supply connection
[0179] 2600 Supplying a main consumer
[0180] 2700 Supplying a secondary consumer
[0181] A surroundings
[0182] B Filling direction
[0183] Compressed air
[0184] DS control pressure
[0185] G closed compressed air supply
[0186] O open compressed air supply
[0187] Z (first) junction
[0188] Z2 second junction
[0189] E Venting branch
[0190] S1 first switching position
[0191] SP Locking Position
[0192] K Condensate
Claims
1. Patent claims 1. Compressed air supply system (100) for a pneumatic system (10, 11) of a vehicle (1000), in particular a commercial vehicle (1100), comprising: a compressor (101) for compressing compressed air (D), a compressed air supply system (201, 202, 203, 204) with a main compressed air connection (1, 1.1) for connection to the compressor (101), a main compressed air supply connection (2.1) and a secondary compressed air supply connection (2.2) for providing compressed air (D), a pneumatic main line (210) for conveying compressed air (D) from the main compressed air connection (1, 1.1) to the main compressed air supply connection (2.1), a supply line (251, 251.1) for conveying compressed air (D) from the Main compressed air connection (1 , 1.1 ) to the secondary compressed air supply connection (2.2), wherein an air dryer (220) for drying the compressed air (D) is arranged in the main pneumatic line (210) and the supply line (251 , 251.1) branches off from the main pneumatic line (210) between the main compressed air connection (1, 1.1) and the air dryer (220), wherein the main compressed air supply connection (2.1) is designed to connect a main consumer (300) and the secondary compressed air supply connection (2.2) is designed to connect a secondary consumer (400), characterized by a switchable air dryer protection valve arrangement (270) which is designed to at least selectively disconnect the supply line (251, 251.1) from the air dryer (220) for the flow of compressed air (D).
2. Compressed air supply system (100) according to claim 1, wherein the air dryer protection valve arrangement (270) has a switchable air dryer protection valve (271) arranged in the pneumatic main line (210), which is configured to selectively block and release the pneumatic main line (210) between the main compressed air connection (1, 1.1) and the air dryer (220).
3. Compressed air supply system (100) according to claim 2, wherein the supply line branches off from the main pneumatic line at a branch point (Z) and the air dryer protection valve (271 ) is designed as a 2 / 2-way valve (272) and is arranged between the branch point (Z) and the air dryer (220), wherein the 2 / 2-way valve (272) is configured to selectively block and release the main pneumatic line (210) between the branch point (Z) and the air dryer (220).
4. Compressed air supply system (100) according to claim 3, wherein the air dryer protection valve arrangement (270) has a switchable secondary circuit shut-off valve (274) designed as a 2 / 2-way valve and arranged in the supply line (251 , 251.1 ), which is configured to selectively open and close the supply line (251 , 251.1).
5. Compressed air supply system (100) according to claim 2, wherein the supply line (251, 251.1) branches off from the main pneumatic line at a branch point (Z), and the air dryer protection valve (271) is designed as a 3 / 2-way valve (273, 273') and is arranged at the branch point (Z), wherein the 3 / 2-way valve (273, 273') is configured to at least selectively disconnect the supply line (251, 251.1) from the air dryer (220) for the flow of compressed air (D) and to selectively block and release the main pneumatic line (210) between the main compressed air connection (1, 1.1) and the air dryer (220).
6. Compressed air supply system (100) according to one of the preceding claims, wherein the compressor (101) has a first compressor stage (110) for compressing compressed air (D) to a first pressure level (D1) and a second compressor stage (120) for compressing the compressed air (D) to a second pressure level (D2) which is higher than the first pressure level (D1), wherein the first compressor stage (110) has a first inlet (111) and a first outlet (112) connected to an intake port (0 / 3), and the second compressor stage (120) has a second outlet (122) connected to the main pneumatic line (210) and a second inlet (121) connected to the first outlet (112) via a line section (140). wherein the compressed air supply system (100) further comprises a compressor switching valve (290) which is configured to selectively block and release the pipe section (140).
7. Compressed air supply system (100) according to claim 6, wherein the compressor switching valve (290) is a 2 / 2-way compressor valve (291), preferably a normally closed 2 / 2-way compressor valve (291), and / or wherein the 3 / 2-way valve (273) is an electrically actuated normally closed 3 / 2-way directional valve (273), or wherein the 3 / 2-way valve (273') is a pneumatically actuated 3 / 2-way valve (273') which can be actuated by a control pressure (DS) taken from the outlet side of the first compressor stage and / or from a boost line (282) connected to a reservoir (281).
8. Compressed air supply system (100) according to one of the preceding claims, wherein the compressed air supply system (100) has a water collection volume (211 ) between the main compressed air connection (1 , 1.1 ) and the air dryer protection valve arrangement (270).
9. Compressed air supply system (100) according to one of the preceding claims, the compressor (101) comprising a first compressor stage (110) for compressing compressed air (D) to a first pressure level (D1) and a second compressor stage (120) for compressing the compressed air (D) to a second pressure level (D2) which is higher than the first pressure level (D1), wherein the compressed air supply system (100) comprises an auxiliary compressed air connection (1.2) connected to the first compressor stage (110) and a second auxiliary compressed air supply connection (2.3) for providing the compressed air compressed by the first compressor stage, wherein the second auxiliary compressed air supply connection (2.3) is configured for connecting a second auxiliary consumer (500).
10. Compressed air supply system (100) according to claim 9, wherein the compressed air supply system (100) comprises a reservoir (281), a boost line (282) connected to the reservoir, and a filling valve (283) configured for selectively releasing and blocking the boost line (282), and wherein the second auxiliary compressed air supply connection (2.3) is connected to the auxiliary compressed air connection (1.2) via the boost line (282).
11. Pneumatic system (10) for a vehicle (1000), in particular a passenger car (1100), comprising: a compressed air supply system (100) according to one of claims 1 to 10, a main consumer (300) connected to the main compressed air supply port (2.1), and an auxiliary consumer (400) connected to the secondary compressed air supply port (2.2) 12. Pneumatic system (10) according to claim 11, wherein the main consumer (300) is configured to form a closed compressed air supply circuit (G) with the compressed air supply system (100), such that compressed air (D) is supplied to the main consumer (300) for actuating a number of main actuators (320), and compressed air (D) is returned to the compressed air supply system (100) for venting the main actuators (320).
13. Pneumatic system (10) according to claim 11 or 12, wherein the auxiliary consumer (400) is configured to form an open compressed air supply circuit (O) with the compressed air supply system (201 , 202, 203, 204) such that compressed air (D) is supplied to the auxiliary consumer (400) to actuate a number of auxiliary actuators (420, 430) and is discharged by the auxiliary consumer (400) to an environment (A).
14. Pneumatic system (10) according to claim 12 or 13, wherein the main consumer (300) is an air suspension system (301) or a brake system (302), and / or wherein the secondary consumer (400) is a sensor cleaning device (401) or a tire inflation system (501) or a signal horn (502).
15. Vehicle (1000), in particular passenger car (1100), with a pneumatic system (10) according to one of claims 11 to 14.
16. Method (2000) for operating a pneumatic system (10), in particular a pneumatic system according to one of claims 11 to 13, comprising the steps: Compression (2100) of compressed air (D) by a compressor (101 ), Supply (2200) compressed air (D) at a main compressed air connection (1 , 1.1 ), at least selective separation (2300) of the air dryer (220) from the supply line for the flow of compressed air (D), Lead (2400) of compressed air (D) from the main compressed air connection (1 , 1.1 ) to a main compressed air supply connection (2.1 ) via a pneumatic main line (210) and an air dryer (220), Lead (2500) of compressed air (D) from the main compressed air connection (1 , 1.1 ) to a secondary compressed air supply connection (2.2) via a supply line (251 , 251.1 ), which branches off from the main pneumatic line (210) at a junction (Z), Supplying (2600) a main consumer (300) connected to a main compressed air supply connection (2.1) with compressed air (D), Supplying (2700) an auxiliary consumer (400) connected to the auxiliary compressed air supply connection (2.2) with compressed air (D).