WO2013010605A2

WO2013010605A2 - Multi-circuit protection valve, aeration method, air treatment device, compressed-air system and vehicle, for aerating a plurality of deaerated pressure circuits in a defined filling sequence

Info

Publication number: WO2013010605A2
Application number: PCT/EP2012/002097
Authority: WO
Inventors: Heinrich Diekmeyer; Konrad Feyerabend; Mohammad-Reza Ghafari; Yves Hansen
Original assignee: Wabco Gmbh; Eggebrecht, Detlev
Priority date: 2011-07-15
Filing date: 2012-05-16
Publication date: 2013-01-24
Also published as: WO2013010605A3; DE102011107490A1

Abstract

The invention relates to a multi-circuit protection valve (1) for the protection of a plurality of pressure circuits (10, 12, 14; 50, 52, 54, 56, 58, 60) with a defined filling sequence, and to an aeration method (94) for the aeration of a plurality of deaerated pressure circuits (10), (12), (14) in a defined filling sequence. The multi-circuit protection valve (1) has a first valve V1 via which a first pressure circuit PC1 is aerated from a time T1 onward. The multi-circuit protection valve (1) furthermore has a second valve V2 via which a second pressure circuit PC2 is aerated in particular from a time T2, which precedes the time T1, onward. Finally, the multi-circuit protection valve (1) has a bypass B which is arranged together with the first and the second valve V1, V2 on a closed path PA. The first pressure circuit PC1 is aerated via the bypass B from a time T3, which precedes the time T1, onward. The invention also relates to an air treatment device, a compressed-air system and a vehicle. The invention permits advantageous control of the filling sequence in the case of a deaerated compressed-air system.

Description

Multi-circuit protection valve, ventilation method, air treatment device, compressed air system and vehicle for ventilating several vented pressure circuits in a defined order of refilling

The invention relates to a multi-circuit protection valve for circuit protection of multiple pressure circuits with a defined Auffüllreihenfolge the vented pressure circuits and a ventilation method for venting a plurality of vented pressure circuits in a defined Auffüllreihenfolge. Furthermore, the invention relates to an air treatment device and a compressed air system with the multi-circuit protection valve or means for carrying out the ventilation method and a vehicle with the multi-circuit protection valve or with the compressed air system or with means for carrying out the ventilation process.

Vehicles, especially commercial vehicles, often have several compressed air devices that need to be supplied with compressed air. The compressed air is usually provided by a compressor and stored temporarily in compressed air storage tanks. Several of the compressed air devices are connected to different pressure circuits. Each pressure circuit is protected by a circular safety valve, which protects the respectively protected pressure circuit from a pressure loss, if there is a pressure loss in another pressure circuit. Furthermore, it is possible to limit the pressure in the individual pressure circuits to a specific maximum pressure. Finally, it is possible to ventilate the vented pressure circuits in a defined Auffüllreihenfolge and thus to fill.

It is known first to ventilate a pressure-limited circuit that provides compressed air for a motor control. The following will be in the Usually two brake circuits for the service brake of the vehicle filled. Then a pressure circuit for a trailer brake and a parking brake is filled, so that the parking brake can be solved by means of this compressed air only when sufficient compressed air for the service brake is available. Finally, other facilities, such as a Getriebestellpneumatik and comfort consumers such as a driver's seat suspension are vented through a further pressure circuit.

To control the Auffüllreihenfolge it is known to use as a circuit safety valves overflow valves that open at an opening pressure and close at a lower than the opening pressure closing pressure, since for the opening and closing of the overflow both the pressure on the input side and the pressure on the output side of this Overflow valve is relevant.

If the vehicle has not been operated for a long period of time, some or all of the pressure circuits may be drained or vented. To control the Auffüllreihenfolge these pressure circuits, it is known to let the circuit breaker valves open in a defined order or to take a passage position. For this purpose, it is known to use overflow valves that open at different opening pressures. However, overflow valves can only be adjusted inaccurately to a defined opening pressure, so that the different opening pressures should be so far apart that the defined filling order of the pressure circuits or a defined opening sequence of the circuit safety valves is reliably maintained. As a result, the number of possible opening pressures or different pressure levels is severely limited.

Various measures are known, with a constant number of different opening pressures of the circuit fuse used to increase the number of pressure circuits to be ventilated in a defined refill order. Thus, the aeration of the trailer brake circuit and the brake circuit for the parking brake until after filling at least one service brake circuit, for example, ensures that the brake circuit for the trailer brake and the parking brake on the service brake circuits and spring-loaded check valves and in turn a circuit backup valve is vented. The circuit protection valve for the brake circuit for the trailer brake and parking brake is thus connected downstream of the circuit breaker valves for the service brake circuits and therefore opens despite equal opening pressure only with sufficient filling at least one service brake circuit.

Furthermore, it is known to connect a bypass valve designed as a bypass valve in parallel, so that the outlet side of the overflow valve can be ventilated from the inlet side of this overflow valve via the bypass and the overflow valve is thereby supported on the outlet side during opening. The spill valve therefore opens rather than a vented on its input side, but not supported on the output spill over valve, which is designed for the same opening pressure.

It is an object of the present invention to provide an improved multi-circuit protection valve and ventilation method for ventilating a plurality of vented pressure circuits in a defined refilling order and an improved air handling device, an improved pneumatic system and an improved vehicle.

The invention solves this problem with a multi-circuit protection valve according to claim 1, with a ventilation method according to claim 10, with an air treatment device according to claim 19, with a compressed air system according to claim 20 and with a vehicle according to claim 21. The multi-circuit protection valve has a first valve for venting a first pressure circuit via this first valve from a time T1. Furthermore, the multi-circuit protection valve has a second valve for ventilating a second pressure circuit via this second valve from a time T2. In particular, this time T2 is earlier than the time T1. In this case, the respective valve is vented exclusively from the respective time, based on the beginning of filling the pressure circuits, after they were completely vented, but not before the respective time T1 or T2 via the respective first and second valve.

According to the invention, a bypass for ventilating the first pressure circuit via this bypass is arranged together with the first and the second valve on a closed path starting at a time T3 which is earlier than the time T1. The closed path is a circle through which compressed air can flow from an entrance to an exit to the left over a first part of the closed path or to the right over a second part of the closed path. The first and the second part are thus connected in parallel with each other and together form the closed path. The first pressure circuit can be vented via the bypass rather than via the first valve. At a later time, venting may be continued alone or assisted by the first valve. Depending on further embodiment of the multi-circuit protection valve so that, for example, the first valve can be supported by the bypassed via the bypass air pressure when opening, especially if the first valve is a spill valve. As a result, the number of pressure circuits to be ventilated in a defined order with a constant number of opening pressures is increased.

Depending on further embodiment of the multi-circuit protection valve, it is alternatively possible to ventilate the first pressure circuit before the second pressure circuit by means of the bypass. In particular, when the first pressure circuit is pressure-limited, in the second pressure circuit, however, a higher pressure rer pressure is permitted and at least one subsequently to be filled pressure circuit is again pressure-limited, thereby an additional pressure relief valve can be saved by this further pressure-limited pressure circuit and the first pressure circuit via the first valve by means of a common pressure relief valve pressure limited. The bypass or the multi-circuit protection valve is designed in this case such that venting of the first pressure circuit is only possible up to the maximum permissible pressure to which this first pressure circuit is pressure-limited via the bypass.

According to the aeration method, the first pressure circuit is vented via the first valve from the time T1 and the second pressure circuit via the second valve from the, in particular with respect to the time T1 earlier, time T2, the first pressure circuit via the together with the first and the second Valve arranged on the closed path bypass is ventilated from the earlier time T3 compared to the time point T1.

According to a preferred embodiment, at least the second valve, preferably also the first valve, a circular safety valve, in particular overflow valve on. The first and the second valve are particularly preferably circular fuse valves, in particular overflow valves. The same applies preferably for any existing additional valves, which are directly upstream of any further pressure circuits. Overflow valves mean valves whose opening is supported by compressed air applied on both the input side and the output side. This makes it possible to assist the circuit backup valve on the output side before opening the characteristic opening of the respective valve opening pressure on the input side of the valve is reached. Thus, according to the method, switching into the passage position or holding in the passage position of the first and second valves is supported on the input side and on the output side. According to a preferred embodiment, compressed air supplied via the bypass shortens the time until the first valve is opened. The bypass is arranged according to shorten this period in the multi-circuit protection valve. Preferably, the bypass or the bypassed compressed air supports the first valve when opening, so that the first valve opens earlier than would be the case without the bypass. In particular, the first valve is supported on the output side when opening. Compressed air is fed via the bypass to the outlet of the first valve.

According to a preferred embodiment, the bypass has a designed as a 2/2-way valve or check valve valve, which is called here because of its positioning in the bypass bypass valve. According to the method, the first pressure circuit is vented via the, in particular from the time T3 switched into passage position, bypass valve. By means of the bypass valve a venting is possible even at a very low pressure or a very small pressure difference between the input side and the output side of the bypass valve. This allows the first pressure circuit to be ventilated early.

The bypass valve is according to a particular embodiment, a non-spring-loaded check valve and according to another particular embodiment, a spring-loaded check valve. By means of the trained as a spring-loaded check valve bypass valve, the bypass valve can close below a certain pressure difference between the input side and the output side of the bypass valve, so that the pressure in the first pressure circuit via this bypass valve is not increased to the pressure applied to the input of the bypass valve and the first pressure circuit thus can remain pressure-limited via the first valve, if this first valve, a corresponding pressure relief valve upstream or downstream. According to a preferred embodiment, the bypass has a throttle or a diaphragm. Both the throttle and the diaphragm limit the volume flow, wherein a throttle point of the diaphragm has a length 0, in contrast to a throttle point of the throttle. In the following, a distinction is not made between a throttle and a diaphragm, so that a throttle is understood to mean an orifice and an orifice also means a throttle.

The throttle or diaphragm is either integrated in the bypass valve or upstream of the bypass valve or downstream of this bypass valve. According to the method, the throttle or orifice of the bypass ensures a throttled venting of the first pressure circuit. On the other hand, a fast venting in the case of a defective pressure circuit ("circle break") on the output side of the bypass would lead to a strong loss of air or pressure loss of the intact pressure circuit on the input side of the bypass in the defective pressure circuit. This air loss or pressure loss could not be compensated by the amount of air delivered by the compressor, which is avoided by the arrangement of the throttle in the bypass. By the throttle or orifice is thus ensured that only throttled in a circle break or loss of pressure in the first pressure circuit and thus not too much compressed air escapes, so that the function of the remaining circles is maintained at a safe level.

According to a preferred embodiment, for venting the first pressure circuit of the bypass downstream of the second valve in series. Thus, according to the method, the first pressure circuit is initially ventilated via the second valve and further via the bypass connected in series downstream of the second valve. The second valve and the bypass are thus arranged together parallel to the first valve. This arrangement is advantageous if the opening of the first valve after venting the second pressure circuit to be supported. In particular, it can be achieved that the first pressure circuit is vented immediately after venting the second pressure circuit.

According to a preferred alternative embodiment, the first valve is connected downstream of the second valve in order to fill the first pressure circuit. According to the method, the first pressure circuit is ventilated via the second valve and via the first valve connected in series with the second valve. The second and the first valve are arranged together parallel to the bypass. This can be achieved that the first pressure circuit is vented before the second pressure circuit. Furthermore, the opening of the first valve can be supported. Therefore, the first valve may open in front of a possibly further input-side equally ventilated valve, which is otherwise set to the same opening pressure.

According to a preferred embodiment of the invention, the multi-circuit protection valve has two or more than two closed paths, on each of which a bypass and a first and a second valve are arranged. In each case, a first pressure circuit according to one of the described embodiments can be ventilated.

According to a special embodiment, the bypass valve is a 2/2-way valve, which can be switched pneumatically via a first control input against the force of a spring in passage position and a second control input together with the force of the spring in blocking position. This enables or disables a connection between a work input and a work output of the bypass valve. The first control input is pneumatically connected to its working input. The second control input, however, is ventilated via the second valve. As a result, the bypass can be blocked in a targeted manner if sufficient compressed air is supplied to the next one via the second valve Venting of the first pressure circuit can be provided via the first valve.

According to a preferred embodiment, the multi-circuit protection valve has a first pressure limiting valve arranged in the closed path for limiting the pressure P2 in the second pressure circuit to a lower, limited pressure P2max than the maximum possible pressure P1max in the first pressure circuit or for limiting the pressure P1 'in the first pressure circuit to a lower pressure P1 max 'than the maximum possible pressure P2max' in the second pressure circuit. According to the method limits the first pressure relief valve P2 corresponding to the pressure P2max and the pressure ΡΓ according to the pressure P1 max '. In particular, the first pressure limiting valve is connected in series with the second valve at limited pressure P2 or in series with the first valve at limited pressure P1 '. The first pressure relief valve allows a pressure limitation of one or more downstream pressure circuits, in particular if these pressure circuits are not applied in parallel with a higher pressure.

According to a preferred embodiment, the multi-circuit protection valve has a first valve arranged downstream of the first pressure-limiting valve, in particular next to the first or second valve and the same or a similar or nominal opening pressure equal to the first or second valve within the scope of manufacturing tolerances for the pressure-limited venting of a third pressure circuit via this third valve from a time T4 which is later than the time T1. According to the method, the third pressure circuit is vented via the third valve from the time T4 to limit pressure. Thereby, the third pressure circuit can be vented at this later time T4, even if the opening pressure of the third valve is set equal to the opening pressure of the first and second valves. According to a further embodiment, the bypass on the bypass valve, wherein the bypass valve as, in particular electronically controlled, solenoid valve or as, in particular electronically pilot-controlled, valve is formed, which is precontrolled by a further valve, in particular electronically controlled solenoid valve. The pilot-operated valve is actuated by means of the solenoid valve provided compressed air. The electronic control is preferably carried out by means of an electronic unit (ECU). In this way, the bypass valve is opened and / or closed electronically controlled.

Preferably, the control of the bypass valve or the opening and closing of the bypass valve in response to a sensed in at least one pressure circuit pressure. In particular, the pressures in several or all pressure circuits are taken into account in the control. Preferably, pressure sensors for measuring these pressures are arranged in the pressure circuits. Thus, the Auffüllreihenfolge can be changed or varied depending on the sensed pressures in the pressure circuits.

The air treatment device according to the invention has the multi-circuit protection valve and / or means for carrying out the ventilation process. In particular, the air treatment device further comprises means for separating condensate from the compressed air.

The compressed air system according to the invention, in particular for a vehicle, has the multi-circuit protection valve and / or means for carrying out the ventilation method. In particular, the compressed air system further comprises devices of the vehicle supplied with compressed air, for example brakes. The vehicle according to the invention, in particular commercial vehicle, has the multi-circuit protection valve and / or means for carrying out the ventilation method and / or the compressed air system.

Further embodiments of the invention will become apparent from the claims and from the embodiments explained in more detail with reference to the drawing. In the drawing show:

Fig. 1 is a circuit diagram of a multi-circuit protection valve according to a first embodiment of the invention;

Fig. 2 is a circuit diagram of a multi-circuit protection valve according to a second embodiment of the invention;

3 is a circuit diagram of a multi-circuit protection valve according to a third embodiment of the invention;

4 is a circuit diagram of a multi-circuit protection valve according to a fourth embodiment of the invention;

Fig. 5 is a circuit diagram of a multi-circuit protection valve according to a fifth embodiment of the invention and

Fig. 6 is a block diagram illustrating the ventilation method according to an embodiment of the invention.

The same reference numerals in the figures designate the same or at least similar or functionally identical parts.

Fig. 1 shows a multi-circuit protection valve 1 according to a first embodiment of the invention. The multi-circuit protection valve 1 has a compressed air inlet 2, via which the multi-circuit protection valve. 1 compressed air, for example, by a compressor, not shown, is provided. The compressor can provide compressed air at a pressure of, for example, up to 13 bar. Furthermore, the multi-circuit protection valve 1 has compressed air outlets 4, 6 and 8 for providing compressed air for various pressure circuits 10, 12 and 14. Each of the pressure circuits 10, 12 and 14 each have a compressed air reservoir 16 or 18 and 20, which may also be omitted alternatively as an alternative to the illustrated embodiment. Furthermore, each pressure circuit 10, 12 and 14 is secured by a respective designed as a relief valve circuit fuse valve 22 or 24 and 26 respectively. The circular safety valves 22, 24 and 26 each have a pneumatically connected to the compressed air inlet 2 working input and a pneumatically connected to the respective compressed air output 4 or 6 or 8 working output. The operation of the circular safety valves 22, 24 and 26 will be described below by way of example for the circuit safety valve 26, but is analogous to the operation of the circuit breaker valves 22 and 24 transferable.

When the compressed air inlet 2 and thus the working input of the circular safety valve 26 is depressurized, the circular safety valve assumes its locking position by the force of a spring or is closed. Any remaining in the pressure circuit 14 residual pressure is not enough to open the valve 26 against the force of the spring. After a longer service life of a vehicle, which has a compressed air system with the multi-circuit protection valve 1, the pressure circuit 14 is vented in the rule or pressure-free in relation to the ambient air pressure. Now, if the compressor increases the pressure at the working input of the circular safety valve 26, the circular safety valve 26 opens or assumes its passage position as soon as a characteristic of the circular safety valve 26 opening pressure is reached. This opening pressure depends on the structural design of the circuit safety valve 26 including the power of his pen. As soon as compressed air flows from the working input to the working outlet of the circular safety valve 26, the pressure at the working outlet acts in a supportive manner against the force of the spring, so that the circular safety valve 26 remains open even when the pressure at its working inlet drops below the opening pressure. Only when compared to the opening pressure lower closing pressure at the work input is reached or exceeded, closes the circuit safety valve 26 again. The circular safety valve 26 protects the pressure circuit 14 from venting via this circular safety valve 26 if a compressed air drop at the working inlet of the circular safety valve 26 occurs due to a defect in the compressed air system.

In vented compressed air system or when both the compressed air inlet 2 and the pressure circuits 10, 12 and 14 are depressurized (compared to the ambient air pressure), it is desirable to fill the pressure circuits 10, 12 and 14 in a defined order, for example, safety-related compressed air consumers , For example, brakes, already at an earlier date to supply compressed air than, for example, comfort consumers such as a seat suspension. The multi-circuit protection valve 1 allows the control of the Auffüllreihenfolge the pressure circuits 10, 12 and 14 in conjunction with the circular safety valves 22, 24 and 26, which are all the same or similar and open at the same opening pressure or occupy their passage position from the working input to the working output. In particular, the circular safety valves 22 and 26 may be designed for the same opening pressure. Possibly. can also be ensured in other ways that the circuit fuse valve 24 earlier than the circuit breaker valves 22 and 26 assumes its passage position. For example, in deviation from the exemplary embodiment shown, the pressure circuit 12 can be ventilated via a circular safety valve which has a lower opening pressure than the circular safety valves 22 and 26. In the illustrated first exemplary embodiment according to FIG. 1, in the case of a pressure build-up at the compressed air inlet 2, compressed air first flows through a check valve 28 to the compressed air outlet 6 or into the pressure circuit 12 and thus also to the working outlet of the circular safety valve 24.

At the same time, the pressure provided at the compressed air inlet 2 is applied to the working inputs of the circular safety valves 22, 24 and 26. The flow of compressed air through the check valve 28 is throttled by a throttle 30.

The circular safety valve 22 can be identified as a first valve V1 for venting a first pressure circuit PC1, namely the pressure circuit 10, via this first valve V1. The circuit safety valve 24, the check valve 28 and the throttle 30 can be identified together as a second valve V2 for venting a second pressure circuit PC2, namely the pressure circuit 12, via this second valve V2. In particular, the second pressure circuit PC2 is vented from a time T2 via the check valve 28 of the second valve V2, whereas the first pressure circuit PC1 is ventilated via the first valve V1 only at a later time T1. However, the first pressure circuit PC1 is already vented via a bypass B before this time T1, namely at a time T3. In particular, compressed air flows via the second valve V2 not only into the second pressure circuit PC2, but also in part via the bypass B to the first pressure circuit PC1 or to the working outlet of the first valve V1 or the circular safety valve 22. The bypass B has this in any Sequence connected in series formed as a check valve by-pass valve 32 and a throttle or orifice 34. As an alternative to the exemplary embodiment shown, the bypass valve 32 can be designed as another valve, for example as a pneumatically controlled 2/2-way valve, which can optionally be pilot-controlled by means of a pilot valve. The compressed air flowing via the bypass B to the working outlet of the circular safety valve 22 assists in opening the circular safety valve 22 or the first valve V1 so that the circular safety valve 22 already opens at a pressure at its working inlet which is below its opening pressure.

The first valve V1, the second valve V2 and the bypass B are arranged together on a closed path PA. In particular, two circuit breaker valves or overflow valves, namely the circular safety valves 22 and 24, are arranged on this path PA. The valves V1 and V2 and the bypass B are thus three arranged on a pressure medium circuit arranged devices, between each two of these devices is a connection to the compressed air inlet 2, the compressed air outlet 4 or the compressed air outlet 6.

Finally, the circuit safety valve 26 can be identified as a third valve V3 for venting a third pressure circuit PC3, namely the pressure circuit 14, via this third valve V3. The third valve V3 opens only at a time T4 after the time T1, at which the first valve V1 opens. Namely, the third valve V3 is not supported during opening on the output side, so that this third valve V3 opens only when in fact the required opening pressure is present at its working input or is provided via the compressed air inlet 2. After all, first, the first and the second pressure circuit PC1 and PC2 and the pressure circuits 10 and 12 and only subsequently the third pressure circuit PC3 and the pressure circuit 14 are vented.

Fig. 2 shows a multi-circuit protection valve 1 'according to a second embodiment of the invention. The multi-circuit protection valve 1 'in turn has a closed path PA ¹ with the bypass B. Further, on the path PA 'designed as a relief valve circuit fuse 36, which can be identified as a first valve V1, and another as Overflow valve trained circular safety valve 38, which can be identified as a second valve V2 arranged. On the path PA ', a first pressure limiting valve 40 is arranged, which limits the pressure P2 in the pressure circuit PC2 to a value P2max which is below the maximum possible pressure P1max in the first pressure circuit PC1.

Further, in the path PA 'depending on the view either designed as a relief valve circular safety valve 42 and a spring-loaded check valve 44 in series or designed as a relief valve circuit fuse valve 46 and a spring-loaded check valve 48 arranged in series. Alternatively, one of the valves 42, 44, 46 or 48 may alternatively be considered a second valve V2.

The multi-circuit protection valve 1 'provides a defined Auffüllreihenfolge for venting of pressure circuits 50, 52, 54, 56, 58 and 60 before. The pressure circuit 58 is the pressure circuit identified as the first pressure circuit PC1 and the pressure circuit 56 is the pressure circuit identified as the second pressure circuit PC2. The pressure circuit 60 can be identified as the third pressure circuit PC3, which is preceded by a third valve V3 designed as a relief valve circular safety valve 62. The pressure circuit 50 is vented via a valve having a designed as a relief valve circuit fuse valve 64 and a parallel-connected check valve 66 with a series connected to the check valve 66 throttle or aperture 68. The circuit safety valve 64 and the throttle 68 and the check valve 66 is preceded by a second pressure relief valve 70 which limits the pressure in the pressure circuit 50 to a maximum allowable value. In particular, the second pressure limiting valve 70 closes when the pressure at the working input of the second pressure limiting valve 70 or the pressure at the compressed air inlet 2 reaches or exceeds this defined maximum permissible value. In the pressure circuits 52, 54 and 56, a compressed air reservoir 72 and 74 and 76 is arranged. In the pressure circuits 50, 58 and 60 may alternatively be arranged compressed air reservoir as an alternative to the embodiment shown. Furthermore, individual or all of the compressed air reservoirs 72, 74 and 76 can be omitted.

The circular safety valves 38, 42, 46 and 64 have the same opening pressure OP1. In contrast, the circular safety valves 36 and 62 have a higher opening pressure OP2. This results in the following sequence of ventilation of the pressure circuits 50 to 60, starting from a vented compressed air system with this multi-circuit protection valve 1 ':

In response to a buildup of pressure at the compressed air inlet 2, compressed air is directed to the working inputs of the circuit breaker valves 36, 42, 46 and 64. Furthermore, compressed air already flows via the orifice 68 and the check valve 66 into the pressure circuit 50 and to the working outlet of the circular safety valve 64, which thus already opens before the circular safety valves 42 and 46, which have the same opening pressure. The pressure circuit 50 is thus first ventilated. To the pressure circuit 50, a motor control is preferably connected.

Subsequently, when the opening pressure of the circular safety valves 42 and 46, which is below the opening pressure of the circular safety valve 36, is provided at the compressed air inlet 2, the circular safety valves 42 and 46 open and aerate the pressure circuits 52 and 54. These pressure circuits 52 and 54 are preferably a first and a second service brake circuit of a vehicle, which has the compressed air system with the multi-circuit protection valve 1 '.

When the pressure circuits 52 and / or 54 or the service brake circuits are sufficiently filled, the check valves 44 and / or 48 open and direct compressed air via the first pressure limiting valve 40 to the engine. Due to the differently provided opening pressures of these circuit safety valves 38 and 62, the circuit safety valve 38 opens first and ventilates the pressure circuit 56, which preferably serves to supply a trailer brake system and / or a parking brake. A parking brake is usually constructed such that it is inserted in contrast to the service brake in the non-ventilated state or provides a braking effect. By means of compressed air from the pressure circuit 56, however, a release of the parking brake is possible. Thus, it is only compressed air for releasing the parking brake ready when sufficient compressed air for actuating the service brake in the pressure circuits 52 and 54 is available. Thus, in the event of a pressure drop of the service brake or in the pressure circuit 54, the release of the parking brake is prevented or the parking brake is engaged, a check valve 78 is provided, via which the pressure circuit 56 can be vented to the pressure circuit 54. Further, a throttle or orifice 80 is connected in series with the check valve 78, so that the pressure circuit 56 is not vented abruptly.

The pressure circuit 58 or the first pressure circuit PC1 is also ventilated via the circuit-securing valve 38 or second valve V2 and further via the bypass B, even before the circuit-breaker valves 36 and 62 open. By means of the bypass B, the circular safety valve 36 or the first valve V1 is assisted upon opening, so that this circular safety valve 36 or the first valve V1 opens before the circular safety valve 62 or the third valve V3. In the defined Auffüllreihenfolge so the first pressure circuit PC1 is first throttled through the aperture B and then vented through the first valve V1 before the third valve V3 opens at a later time T4 and the pressure circuit 60 and the third pressure circuit PC3 vented.

3 shows a multi-circuit protection valve 1 "according to a third exemplary embodiment of the invention. The multi-circuit protection valve 1" differs from the multi-circuit protection valve 1 'according to FIG. limited pressure circuit 50 can not be vented via the second pressure relief valve 70 of FIG. 2, but via the first pressure relief valve 40 and additionally via a 2/2-way valve 82 as a bypass valve. The 2/2-way valve 82 allows a direct connection of the compressed air inlet 2 with the pressure circuit 50. For this purpose, the 2/2-way valve 82 has a connected to the compressed air inlet 2 working input and connected to the pressure circuit 50 working output and two switchable states, in the work input and the work output are either connected or locked against each other. For controlling the 2/2-way valve 82, a first control input 84 is pneumatically connected to the working input or to the compressed air inlet 2. On the other hand, a second control input 86 is pneumatically connected to the working input of the pressure limiting valve 40 or indirectly to the working output of the first circular safety valve 42 or 46 and indirectly to the working input of the circular safety valve 64.

The 2/2-way valve 82 can be operated with the pressure at the first control input 84 against the pressure at the second control input 86 and against the force of a spring for switching from its blocking position to its passage position. The 2/2-way valve 82 switches when pressure builds up at the compressed air inlet 2 in its passage position or opens before the circuit breaker valves 42 and 46 open. As a result, the pressure circuit 50 is ventilated in front of all other pressure circuits 52 to 60, in particular via a throttle or diaphragm 87 arranged in the bypass B '. Only when the pressure circuits 52 and 54 sufficiently filled and sufficient compressed air for switching the 2/2-way valve 82 is provided in its blocking position at the second control input 86, closes the 2/2-way valve 82 again. However, compressed air is then already available with a sufficient pressure for switching the circular safety valve 64. The circular safety valve 64 is supported on the output side during opening by the compressed air guided via the 2/2-way valve 82 into the pressure circuit 50, so that the Circuit safety valve 64 opens in front of the circular safety valve 38. Subsequently, the circuit safety valve 38 opens and the venting continues analogously to the second embodiment of FIG. 2.

In the multi-circuit protection valve 1 ", a further path PA" can be identified in addition to the path PA '. In this path PA ", the bypass B 'is arranged with the 2/2-way valve 82. Further, the path PA" alternatively includes the circuit safety valve 64 as the first valve VV and the circuit safety valve 46 or alternatively the circuit safety valve 42 or, alternatively, the check valve 48 or the check valve 44 as a second valve V2 'on. Again, two overflow valves or circular safety valves, namely the circular safety valves 46 and 64 in the path PA "are arranged.

The circuit safety valve 38 can be identified as the third valve V3 ', which opens at a later time than the first valve VT. The pressure circuit 50 is thus a first pressure circuit PCV, the pressure circuit 54 a second pressure circuit PC2 'and the pressure circuit 56 a third pressure circuit PC3'.

4 shows a multi-circuit protection valve 1 '"according to a fourth embodiment of the invention, which differs by another embodiment of the bypass B' from the multi-circuit protection valve 1" of the third embodiment of FIG. In particular, the bypass B 'in the fourth embodiment shown in FIG. 4 instead of the 2/2-way valve 82, a spring-loaded check valve 88 as a bypass valve, but which can also be designed as a 2/2-way valve. Further, the bypass B 'has a throttle or orifice 90, which is connected in series with the check valve 88. The check valve 88 opens in the Auffüllreihenfolge before the circuit breaker valves 42 and 46 and closes when the pressure difference between the pressure at the compressed air inlet 2 and the pressure in the pressure circuit 50 and in the first pressure circuit PCV a Minimum pressure difference falls below. By a suitable dynamic pressure of the check valve 88 can be ensured that the pressure in the pressure circuit 50 or PCV does not exceed the maximum in this pressure circuit 50 and PC1 permissible pressure.

Fig. 5 shows a multi-circuit protection valve 1 "" according to a fifth embodiment of the invention, which can be understood as a combination of the second embodiment of FIG. 2 and the third embodiment of FIG. 3 or the fourth embodiment of FIG. The second pressure relief valve 70 of FIG. 2 is omitted. The pressure limitation of the pressure circuit 50 is carried out as in the embodiments according to Figures 3 and 4 by means of the first pressure relief valve 40. A bypass B "is not like the bypass B 'in the embodiments of FIG. 3 and FIG. 4 at the first pressure relief valve 40 and Instead, the bypass B "connects the compressed air inlet 2 to the working input of the first pressure limiting valve 40 and thus supplies compressed air from the compressed air inlet 2 to the working input of the first pressure limiting valve 40 when the pressure difference between the pressure at the compressed air inlet 2 and the pressure at the working input of the first pressure limiting valve 40 is above a certain minimum differential pressure. For this purpose, the bypass B "has a spring-loaded check valve 92 as a bypass valve. In the case of a pressure buildup at the compressed air inlet 2 with vented compressed air system with the multi-circuit protection valve 1"", first the pressure circuit 50 via the check valve 92, the first pressure relief valve 40, the throttle 68 and the check valve 66 and subsequently additionally ventilated via the circular safety valve 64. Only when the pressure circuits 52 and 54 are sufficiently filled blocks the check valve 92 and the bypass B "and the filling of the pressure circuits 56, 58 and 60 continues as in the Embodiments of FIG. 3 and 4 continue when there the bypass B 'is locked. A path PA "'in the fifth exemplary embodiment according to FIG. 5 thus has the bypass B" with the check valve 92. Further, the path PA '"includes the check valve 48 as the first valve V1" and the circuit lock valve 46 as the second valve V2 ". Alternatively, the check valve 44 may be considered as the first valve V1" and the circuit lock valve 42 as the second valve V2 " Via the bypass B "as well as via the second valve V2" and the first valve V1 ", the pressure circuit 50 can be ventilated as the first pressure circuit PC1" or, alternatively, the pressure circuit 60 or the pressure circuit 56 as the first pressure circuit PC1 ". As a second pressure circuit PC2 "of the second valve V2" downstream pressure circuit 54 or 52 is identified. When the pressure circuit 50 is the first pressure circuit PC1 ", the pressure circuit 56 can be identified as the third pressure circuit PC3" which is vented via the circuit-breaker valve 38 thus identified as the third valve V3 ".

The illustrated embodiments of the multi-circuit protection valve are to be understood merely as exemplary possible embodiments of the invention. In particular, the invention can expand a variety of known from the prior art multi-circuit protection valves to additional pressure circuits and / or, in particular save a pressure relief valve, structurally simpler and less expensive and / or set a Auffüllreihenfolge with greater precision.

6 schematically shows basic method steps of a ventilation method 94 for ventilating a plurality of vented pressure circuits in a defined filling sequence by means of a multi-circuit protection valve or by way of example by means of the multi-circuit protection valve 1 of the first embodiment according to FIG.

The aeration process 94 starts with a vented compressed air system in a step 96. According to a step 98, a compressor causes a Pressure buildup at the compressed air inlet 2. Subsequently, according to a step 100, the second pressure circuit PC2 is ventilated via or through the second valve V2. Also, the first pressure circuit PC1 is vented via the second valve V2 and according to a step 102 via the second valve V2 in series downstream bypass B, in particular, the step 100 is from a time T2 and the step 102 from a time T3, wherein the time T2 is earlier than the time T3 or equal to the time T3.

According to a step 104, in step 102, the first pressure circuit PC1 is vented via the check valve 32 and the throttle 34.

As a result of the pressure build-up in the first pressure circuit PC1, according to step 106, the switching of the first valve V1 is assisted not only on the inlet side by the pressure at the compressed air inlet 2 but also on the outlet side by the pressure built up in the first pressure circuit PC1 by means of the bypass B. Subsequently, according to a step 108, the first pressure circuit PC1 is vented via the first valve V1, in particular from a point in time T1. The time T1 is a time later than the time T3. In particular, the time T1 is also a time later than the time T2. Only subsequently, according to a step 1 10, the third pressure circuit PC3 is vented via the third valve V3, in particular from the time T4 later than the time T1.

If all pressure circuits are vented, the end of the aeration process 94 is reached in a step 112.

All mentioned in the foregoing description and in the claims features are used individually as well as in any combination with each other. The disclosure of the invention is therefore not limited to described or claimed feature combinations limited. Rather, all feature combinations are to be regarded as disclosed.

Claims

claims

1. A multi-circuit protection valve for securing a plurality of pressure circuits (10, 12, 14, 50, 52, 54, 56, 58, 60) with a defined filling sequence of the vented pressure circuits (10, 12, 14; 50, 52, 54, 56, 58, 60), comprising a first valve (V1; V1 ', V1 ") for venting a first pressure circuit (PC1; PC1', PC1") via said first valve (V1; VT; V1 ") from a time T1 and a second valve (V2; V2 '; V2 ") for venting a second pressure circuit (PC2; PC2'; PC2") via this second valve (V2; V2 '; V2 ") from a time T2,

marked by,

a bypass (B; Β ') arranged along a closed path (PA; PA'; PA '; PA' ') together with the first and second valves (V1, V2; V1', V2 '; V1 ", V2"); B ") for venting the first pressure circuit (PC1; PC1 '; PC1") via this bypass (B; Β'; B ") from a time T3 earlier than the time T1.

2. Multi-circuit protection valve according to claim 1, characterized in that the first and the second valve (V1, V2, V1 ', V2') are circular fuse valves (22, 24, 36, 38, 64, 46).

3. Multi-circuit protection valve according to claim 1 or 2, characterized

by an arrangement of the bypass (B) for shortening the time until the opening of the first valve (V1, V1 ') by means of the bypass (B, B') to the output of the first valve (V1, V1 ') guided compressed air.

4. Multi-circuit protection valve according to one of the preceding claims, characterized in that the bypass (B; Β '; B ") designed as a 2/2-way valve or check valve and bypass valve called valve (32; 82; 88; 92) and a in the bypass valve (32; 82; 88; 92) has an integral or separate throttle or orifice (34; 68; 87; 90) for throttling the first pressure circuit (PC1, PC1 ').

5. Multi-circuit protection valve according to one of the preceding claims, characterized in that for venting the first pressure circuit (PC1) of the bypass (B) is connected downstream of the second valve (V2) in series.

6. Multi-circuit protection valve according to one of claims 1 to 4, characterized in that for ventilating the first pressure circuit (PCV; PC1 ") the first valve (VT; VT) is connected downstream of the second valve (V2 '; V2") in series.

7. Multi-circuit protection valve according to one of the preceding claims, characterized by a in the closed path (PA ¹ , PA ") arranged first pressure relief valve (40) for limiting the pressure (P2) in the second pressure circuit (PC2) to a relation to the maximum possible pressure P1 max in the first pressure circuit (PC1) lower, limited pressure P2max or to limit the pressure P1 'in the first pressure circuit (PC1') to a relation to the maximum possible pressure P2max 'in the second pressure circuit (PC2') lower, limited pressure P1 max '.

8. Multi-circuit protection valve according to claim 7, characterized by a first pressure relief valve (40) next to the first valve (VT) downstream and at the same or a similar opening pressure as the first valve (VV) designed third valve (V3 ¹ ) for pressure-controlled aeration third pressure circuit (PC3 ') via this third valve (VV) from a later than the time T1 later time T4.

9. Multi-circuit protection valve according to one of the preceding claims, characterized in that the bypass (B; Β '; B ") designed as a solenoid valve or a pre-controlled by a solenoid valve and bypass valve called for electronically controlled opening and / or closing of the bypass valve in Dependence on a pressure sensed in at least one pressure circuit.

10. Ventilation method for ventilating a plurality of vented pressure circuits (10, 12, 14, 50, 52, 54, 56, 58, 60) in a defined order of filling by means of a circuit for securing the pressure circuits (10, 12, 14; 50, 52, 54, 56, 58, 60) formed multi-circuit protection valve (1, V;

1 ", 1 '"; 1 ""), wherein a first pressure circuit (PC1; PC1 '; PC1 ") is vented via a first valve (V1; V1'; V1") from a time T1 (108) and a second pressure circuit (PC2; PC2 '; PC2 ") via a second valve (V2; V2 '; V2") is ventilated (100) from a point in time T2, characterized in that the first pressure circuit (PC1; PC1'; PC1 ") has one together with the first and the second valve (V1, V2, VT, V2 ', V1 ", V2") arranged on a closed path (PA, PA', PA ", PA '") bypass (B; Β'; B ") from one opposite the Time T1 earlier stage T3 is vented (102).

1 1. Ventilation method according to claim 10, characterized in that by a configuration of the first and the second valve (V1, V2, VI ', V2') as circuit fuse valves (22, 24, 36, 38, 64, 46) switching to the passage position or the holding in the passage position of this first and second valve (V1, V2, V1 ', V2') is supported on the input side and on the output side (106).

12. Ventilation method according to claim 10 or 1 1, characterized in that via the bypass (B; B ') to the output of the first valve (V1; V1') guided compressed air the time until the first valve (V1, V1 ' ) shortened.

13. Ventilation method according to one of claims 10 to 12, characterized in that the first pressure circuit (PC1, PC1 ') via a switched from the time T3 in passage circuit, designed as a 2/2-way valve or check valve and bypass valve called valve (32; 82; 88; 92) of the bypass (B; Β '; B ") is vented, wherein an integrated or separate in the bypass valve (32; 82; 88; 92) or orifice (34; 68; 87; 96) of the Bypasses (B; B '; B ") for a throttled venting of the first pressure circuit (PC1; PC1') provides (104).

14. Ventilation method according to one of claims 10 to 13, characterized in that the first pressure circuit (PC1) via the second valve (V2) and via the second valve in series downstream bypass (B) is vented.

15. Ventilation method according to one of claims 10 to 13, characterized in that the first pressure circuit (PC1 '; PC1 ") via the second valve (V2 ¹ ; V2") and via the second valve in series downstream first valve (V1 ^1st ; V1 ") is vented.

16. Ventilation method according to one of claims 10 to 15, characterized in that in the closed path (ΡΑ '; PA ") arranged first pressure limiting valve (40) the pressure (P2) in the second pressure circuit (PC2) to one of the maximum possible Pressure P1 max limited in the first pressure circuit (PC1) lower pressure P2max or the pressure PV in the first pressure circuit (PC1 ¹ ) to a lower than the maximum possible pressure P2max 'in the second pressure circuit (PC2 ¹ ) lower pressure P1 max' limited.

17. Ventilation method according to claim 16, characterized in that via a first pressure relief valve (40) in addition to the the first valve (V1 ') downstream and at the same or a similar opening pressure as the first valve (W) designed third valve (V3'), a third pressure circuit (PC3 ') is vented pressure limited from a later time T1 to the time T4.

18. Ventilation method according to one of claims 10 to 17, characterized in that designed as a solenoid valve or a pilot operated by a solenoid valve and bypass valve called the bypass valve (B, Β ', B ") electronically controlled in response to a in at least one pressure circuit sensed pressure is opened and / or closed.

19. Air treatment device with a multi-circuit protection valve (1, 1 ', 1 ", 1'", 1 "") according to one of claims 1 to 8 and / or with means for carrying out the aeration method (94) according to one of claims 9 to 18.

20. Compressed air system with a multi-circuit protection valve (1, 1 \ 1 ", 1" ', 1 "") according to one of claims 1 to 8 and / or with means for carrying out the ventilation method (94) according to one of claims 9 to 18 and / or with an air treatment device according to claim 19.

21. Vehicle with a multi-circuit protection valve (1, 1 ', 1 ", 1'", 1 "") according to one of claims 1 to 8 and / or with means for carrying out the ventilation method (94) according to one of claims 9 to 18 and / or with an air treatment device according to claim 19 and / or with a compressed air system according to claim 20.