Compressed air supply system of a vehicle

Abstract

The invention relates to an electronically controllable compressed air supply system (2.1) of a vehicle, having an air treatment unit (4) which is connected to a compressor via a delivery line (10) and has a dryer unit (12) connected to the delivery line, as well as a safety valve (16) connected to the delivery line, and in which a multi-circuit protection valve (6.1) is connected to the delivery line via a supply line (28) branched on the outlet-side, wherein the line branches (28.1-28.6) of the supply line are led to supply connections (a21-a26) of consumer circuits, wherein an electromagnetically activated passively-closing circuit protection valve (30.1-30.6) is arranged on at least one of the line branches, and in which an electronic control unit (8) is present, which is connected to pressure sensors (38.1-38.4) connected to the line branches of the supply line of some of the consumer circuits. In order to prevent frequent switching operations of the circuit protection valves and to ensure that the consumer circuits are filled in the event of a malfunction of the control unit, a filling valve arrangement (42.1) is provided, having an electromagnetically switchable, passively opening filling valve (44) and a bypass line (46) branched on the outlet side, wherein the filling valve (44) is connected on the inlet side to the delivery line (10) or to the supply line (28), and on the outlet side to the line branches of the supply line for the consumer circuits, via line branches (46.1-46.6) of the bypass line (46) which run parallel to the circuit protection valves.

Description

[0001] Compressed air supply system of a vehicle

[0002] The invention relates to an electronically controllable compressed air supply system for a vehicle, comprising an air treatment unit which is connected to a compressor via a delivery line and has a dryer unit connected to the delivery line and a safety valve connected to the delivery line, and in which a multi-circuit protection valve is connected to the delivery line via a supply line branched on the output side, wherein the line branches of the supply line are led to supply connections of consumer circuits, wherein an electromagnetically actuated, passively closing circuit protection valve is arranged on at least one of the line branches, and in which an electronic control unit is present which is connected via sensor lines to pressure sensors connected to the line branches of the supply line of some consumer circuits.

[0003] Electronically controllable compressed air supply systems for vehicles are known in various designs. In DE 195 15 895 A1, in a first embodiment of a compressed air supply system according to Fig. 1 therein, the circuit protection valves of four consumer circuits are designed as overflow valves with pressure-controlled blocking pistons. The blocking pistons are in their open position when the control inputs are depressurized and in their closed position when the control inputs are pressurized. A 3 / 2-way solenoid switching valve is assigned to each of the blocking pistons of the overflow valves as a pilot valve. The control input of the associated overflow valve is connected to the atmosphere when de-energized and is therefore depressurized, and the control input of the associated overflow valve is connected to the delivery line when energized and is therefore pressurized.

[0004] In a second embodiment of a compressed air supply system according to Fig. 2 therein, the circuit protection valves of four consumer circuits are designed as overflow valves with downstream shut-off valves designed as pressure-controlled 2 / 2-way switching valves. The shut-off valves are each open when the control input is depressurized and closed when the control input is pressurized. A 3 / 2-way solenoid switching valve is assigned to each shut-off valve as a pilot valve. The control input of the associated shut-off valve is connected to the environment when de-energized and is thus depressurized, and the control input of the associated shut-off valve is connected to the delivery line when energized and is thus pressurized.

[0005] In a third embodiment of a compressed air supply system according to Fig. 3 therein, the circuit protection valves of four consumer circuits are designed as shut-off valves in the form of 2 / 2-way solenoid valves. The shut-off valves are closed when de-energized and open when energized.

[0006] Other electronically controllable compressed air supply systems with a similar structure are known from DE 198 35638 A1 and DE 103 57 765 A1.

[0007] Due to vehicle manufacturers' demands for space and weight savings, there is a trend toward reducing the diameter and length of compressed air lines in consumer circuits, as well as reducing the volume of the accumulator tanks in the consumer circuits, or at least eliminating accumulator tanks altogether in some consumer circuits. This allows the minimum pressure to be reached more quickly in some consumer circuits during breaks in driving and ferry operations, which leads to more frequent opening and closing of the switchable circuit protection valves and thus to faster wear. In the case of passively closing circuit protection valves in the compressed air supply system, a malfunction in the electronic control unit also prevents the circuit protection valves from opening and thus from filling the consumer circuits.

[0008] The present invention is therefore based on the object of developing an electronically controllable compressed air supply system for a vehicle of the type mentioned above in such a way that the aforementioned disadvantages are avoided. Above all, this compressed air supply system should avoid frequent switching operations of the circuit protection valves and ensure that the consumer circuits are filled with compressed air even in the event of a malfunction of the electronic control unit. This object is achieved by a compressed air supply system having the features of claim 1. Advantageous developments of this compressed air supply system are defined in the dependent claims.

[0009] Accordingly, the invention relates to an electronically controllable compressed air supply system of a vehicle, with an air treatment unit which is connected to a compressor via a delivery line and has a dryer unit connected to the delivery line and a safety valve connected to the delivery line, and in which a multi-circuit protection valve is connected to the delivery line via a supply line branched on the output side, wherein the line branches of the supply line are led to supply connections of consumer circuits, wherein an electromagnetically actuated, passively closing circuit protection valve (NC = normally closed) is arranged on at least one of the line branches, and in which an electronic control unit is present which is connected via sensor lines to pressure sensors connected to the line branches of the supply line of some consumer circuits.

[0010] To achieve the stated objective, this compressed air supply system is provided with an additional filling valve arrangement having a directly or indirectly electromagnetically switchable, passively opening filling valve and a bypass line branched on the output side, wherein the filling valve is connected on the input side to the conveying line or to the supply line and on the output side via line branches of the bypass line run parallel to the circuit protection valves to the line branches of the supply line for the consumer circuits.

[0011] In other words, the invention relates to an electronically controllable compressed air supply system for a vehicle, comprising an air treatment unit, a multi-circuit protection valve, and an electronic control unit. The air treatment unit comprises a delivery line connected to a compressor, a dryer unit connected to the delivery line, and a safety valve connected to the delivery line. The multi-circuit protection valve comprises a supply line connected to the delivery line and branched on the output side, the line branches of which are connected to supply connections of consumer circuits and each comprise an electromagnetically actuated, passively closing (NC = normally closed) circuit protection valve. The electronic control unit comprises pressure sensors or is connected to them via sensor lines, which are connected to the line branches of the supply line of some consumer circuits.

[0012] The filling valve arrangement provided according to the invention, with a passively opening filling valve, vents or fills all consumer circuits with compressed air when the filling valve or an associated pilot valve is de-energized, without the need to open the existing circuit protection valves. This avoids frequent switching operations of the circuit protection valves and increases their service life.

[0013] In addition, the consumer circuits can be filled with compressed air even if the electronic control unit fails, which would then no longer allow the circuit protection valves, which are designed as solenoid valves, to be energized. The consumer circuits are thus filled via the filling valve arrangement in emergency operation after a failure of the electronic control unit.

[0014] During normal operation, the filling valve arrangement is preferably used for refilling lower consumption levels in the pressure-limited compressed air circuits. The working pressures in the consumer circuits are then controlled as usual via the circuit protection valves. With the filling valve arrangement, the compressed air supply system also complies with the relevant EU directive, which requires two independent compressed air sources for the ventilation of a parking brake circuit, without any additional technical effort.

[0015] According to a first development of the compressed air supply system just described, it can be provided that the filling valve is designed as a 2 / 2-way solenoid valve with an inlet connection and a working connection, that the inlet connection of the filling valve is connected to the delivery line or to the supply line and the working connection of the filling valve is connected to the bypass line, and that the working connection of the filling valve is connected to the inlet connection when the filling valve is not energized and is closed off from the inlet connection of the filling valve when energized.

[0016] To provide the filling valve with a large opening cross-section and to be able to shut it off with a relatively low control current, the filling valve can alternatively be designed as an electromagnetically controllable relay valve with a pressure inlet, a working connection, and a venting outlet, the pressure inlet of which is connected to the delivery line or the supply line, and the working connection of which is connected to the bypass line. Furthermore, it is provided that the working connection is connected to the pressure inlet and blocked from the venting outlet when the filling valve with a large opening cross-section is de-energized, and is connected to the venting outlet and blocked from the pressure inlet when energized.

[0017] As an alternative to a directly electrically controllable version, the filling valve can also be designed as a pressure-controlled 2 / 2-way switching valve with an inlet connection and a working connection, the input connection of which is connected to the delivery line or the supply line and the working connection of which is connected to the bypass line. The working connection is connected to the inlet connection when the control input of the filling valve is pressurized and is shut off from the inlet connection when the control input is depressurized. A 3 / 2-way solenoid switching valve is assigned to the filling valve as a pilot valve. The control input of the filling valve is connected to the delivery line or the supply line when de-energized and to a vent outlet when energized. The mode of operation of this third version of the filling valve is identical to that of the first version of the filling valve.

[0018] To utilize a filling valve with a large opening cross-section and to be able to shut it off with a relatively low control current, the filling valve can alternatively be designed as a pressure-controlled relay valve with a pressure inlet, a working port, and a venting outlet. In this case, the pressure inlet is connected to the delivery line or the supply line, and the working port is connected to the bypass line. When the control inlet of the filling valve with a large opening cross-section is pressurized, the working port of the filling valve is connected to the inlet port and blocked off from a venting outlet. When the control inlet is depressurized, the working port of the filling valve is connected to the inlet port and blocked off from a venting outlet.A 3 / 2-way solenoid valve is also assigned to the filling valve as a pilot control valve, via which the control input of the filling valve is connected to the delivery line or the supply line when de-energized and to a vent outlet when energized. According to a fifth embodiment of the compressed air supply system having the features of the invention, the filling valve is designed as a pressure-controlled 2 / 2-way switching valve with two control inputs acting in the same direction, an inlet connection, and a working connection, the inlet connection of which is connected to the delivery line or the supply line and the working connection of which is connected to the bypass line, wherein the working connection is connected to the inlet connection for both pressurized control inputs and is shut off from the inlet connection for at least one depressurized control input.A 3 / 2-way solenoid valve is also assigned to the filling valve as a pilot valve, via which the first control input of the filling valve is connected to the delivery line or the supply line when de-energized and to a vent outlet when energized, and the second control input of the filling valve is connected directly to the delivery line or the supply line.

[0019] To protect the consumer circuits from excessive supply pressure during venting via the filling valve arrangement, a pressure relief valve is installed in the bypass line before branching into the line branches of all consumer circuits, according to another development of the compressed air supply system. The cut-off pressure of this pressure relief valve can be optionally set to the nominal pressure of the high-pressure consumer circuits (service brake circuits, air suspension circuit), for example, 10.5 * 10 5Pa or to the nominal pressure of the low-pressure consumer circuits (parking brake circuit, trailer brake circuit, auxiliary consumer circuits) of, for example, 8.5 *10 5 Pa must be set.

[0020] Since limiting the supply pressure to the nominal pressure of the high-pressure consumer circuits in the low-pressure consumer circuits can lead to component damage, and limiting the supply pressure to the nominal pressure of the low-pressure consumer circuits can lead to functional limitations in the high-pressure consumer circuits, separate limitation of the supply pressures of the high-pressure and low-pressure consumer circuits is advantageous. For this purpose, a pressure relief valve can be arranged in a branch of the bypass line before the branching into the branch lines of the low-pressure consumer circuits. The cut-off pressure of this pressure relief valve is then limited to the nominal pressure of the low-pressure consumer circuits, for example, 8.5 xio 5Pa. In this case, the supply pressure of the high-pressure consumer circuits can be limited via the safety valve of the air treatment unit or a separate pressure relief valve, which is arranged in a branch of the bypass line before the branching into the branch lines of the high-pressure consumer circuits.

[0021] As an alternative to a separate pressure relief valve within the filling valve assembly, the safety valve of the air treatment unit can also be designed to be pressure-controlled in pressure-controlled versions of the filling valve. Its cut-off pressure is reduced when the control input is pressurized, and its control input is connected to a control line between the pilot valve and the control input of the filling valve. When the control line is pressurized and the filling valve is open, the discharge pressure in the delivery line is separated from the discharge pressure via the safety valve by means of a cut-off pressure of, for example, 12.5 * 10 5 Pa to the reduced cut-off pressure of 10.5 xio 5 Pa or 8.5 xio 5 Pa and thus avoids damage to components within the consumer circuits.

[0022] In order to prevent a backflow of compressed air from the consumer circuits and a pressure equalization between the consumer circuits, a check valve blocking the return flow direction is preferably arranged in the line branches of the bypass line for the consumer circuits.

[0023] As an alternative to the described design of the multi-circuit protection valve with passively closing circuit protection valves for all consumer circuits, the filling valve arrangement according to the invention can also be used with a multi-circuit protection valve that has passively opening circuit protection valves for the two service brake circuits and passively closing circuit protection valves for the remaining consumer circuits. Passively opening circuit protection valves for the service brake circuits have the advantage of ensuring prioritized filling of the service brake circuits even in the event of a malfunction.

[0024] The invention will be further explained below with reference to several embodiments shown in the accompanying drawings.

[0025] Fig. 1 shows a compressed air supply system of a vehicle with a first embodiment of a filling valve arrangement according to the invention in a schematic view,

[0026] Fig. 2 shows a compressed air supply system of a vehicle with a second embodiment of the filling valve arrangement according to the invention in a schematic view, Fig. 3 shows a compressed air supply system of a vehicle with a third embodiment of the filling valve arrangement according to the invention in a schematic view,

[0027] Fig. 4 shows a compressed air supply system of a vehicle with a fourth embodiment of the filling valve arrangement according to the invention in a schematic view,

[0028] Fig. 5 shows a compressed air supply system of a vehicle with a fifth embodiment of the filling valve arrangement according to the invention in a schematic view, and

[0029] Fig. 6 shows a known compressed air supply system of a vehicle in a schematic view.

[0030] Fig. 6 shows a known compressed air supply system 2 for a vehicle, which is electronically controllable. This compressed air supply system 2 comprises an air treatment unit 4, a multi-circuit protection valve 6, and an electronic control unit 8. The air treatment unit 4 has a delivery line 10 which runs between a first inlet connection a1 and an outlet connection a2. The delivery line 10 is connected to a pneumatically controllable compressor (not shown here) via the first inlet connection a1. For the required connection of an external compressed air source, the delivery line 10 is provided with a second inlet connection a1.2 on the inlet side. Consumer circuits connected to the compressed air supply system 2 can be filled as required via the external compressed air source.This is necessary, for example, in the event of a failure of the drive motor or compressor for towing the vehicle, in order to release its parking brakes. A dryer unit 12 and a check valve 14 that blocks the return flow are arranged in the delivery line 10.

[0031] A safety valve 16 is connected to the conveying line 10 upstream of the dryer unit 12 in the conveying direction. This safety valve is a pressure relief valve that limits the conveying pressure in the conveying line 10 to a predetermined maximum pressure. Furthermore, a vent valve 18 is arranged upstream of the dryer unit 12 in the conveying direction. This vent valve connects the conveying line 10 to a silencer 20, if required, through which compressed air can be discharged to the environment. The vent valve 18 is designed as a pressure-controlled 2 / 2-way switching valve, which is closed when the control input is depressurized and open when the control input is pressurized.The control input of the vent valve 18 is connected to a regeneration line 22, which is connected from a further input connection a4 of the air treatment unit 4 to the conveying line 10 via a throttle valve 24 and a check valve 26 blocking the return flow direction between the dryer unit 12 and the aforementioned check valve 14.

[0032] The multi-circuit protection valve 6 has a supply line 28 which is connected to the output connection a2 of the air treatment unit 4 or to the delivery line 10 there and branched on the output side, the line branches 28.1, 28.2, 28.3, 28.4, 28.5, 28.6 of which are each led via a circuit protection valve 30.1, 30.2, 30.3, 30.4, 30.5, 30.6 to the supply connections a21, a22, a23, a24, a25, a26 for six compressed air consumer circuits (not shown in detail).These compressed air consumer circuits include, for example, a first service brake circuit (connected to supply port a21), a second service brake circuit (connected to supply port a22), a parking brake circuit and trailer brake circuit (connected to supply port a23), an auxiliary consumer circuit (connected to supply port a24), an air suspension circuit (connected to supply port a25), and a second auxiliary consumer circuit (connected to supply port a26). The circuit protection valves 30.1, 30.2, 30.3, 30.4, 30.5, and 30.6 are designed as 2 / 2-way solenoid valves, which are closed when de-energized and open when energized.

[0033] In addition, a regeneration control valve 32 and a compressor control valve 34 are arranged within the multi-circuit protection valve 6, each of which is connected to a further line branch 28.7 of the supply line 28. The regeneration control valve 32 is designed as a 3 / 2-way solenoid valve, via which its working connection connected to the inlet connection a4 of the air treatment unit 4 is connected to a vent outlet in the de-energized state and to line branch 28.7 of the supply line 28 in the energized state. To regenerate the dryer unit 12, the regeneration control valve 32 is energized, whereby already dried compressed air from the supply line 28 and the line branch 28 is removed.7 flows via the regeneration control valve 32, the inlet connection a4, the regeneration line 22 with the throttle valve 24 and the check valve 26 against the conveying direction, absorbing moisture through the dryer unit 12 and via the then opened vent valve 18 and the silencer 20 into the environment.

[0034] The compressor control valve 34 is also designed as a 3 / 2-way solenoid valve, via which a control line 36, which is led to a control connection a27 for the compressor, is connected to a vent outlet in the de-energized state and to line branch 28.7 of the supply line 28 in the energized state. To switch off the compressor, the compressor control valve 34 is energized, and the control input of the compressor, connected to the control connection a27, is thus subjected to the discharge pressure from the supply line 28. This leads, for example, to the disengagement of a separating clutch arranged between a drive motor and the compressor or to the opening of a valve leading to the environment at the compressor's output connection.

[0035] The electronic control unit 8 is connected via a dash-dotted electrical control line to the valve magnets of the circuit protection valves 30.1, 30.2, 30.3, 30.4, 30.5, 30.6, the regeneration control valve 32, and the compressor control valve 34. Furthermore, pressure sensors 38.1, 38.2 are located within the electronic control unit 8.

[0036] 38.2, 38.3, 38.4 and temperature sensors 40.1, 40.2, 40.3, 40.4 are shown, which in reality are connected to the control unit 8 via sensor lines. These sensors are each connected to the assigned line branch 28.1, 28.2, 28.3, 28.6 of the supply line 28 for the two service brake circuits, the parking brake circuit and trailer brake circuit, and the second auxiliary consumer circuit.

[0037] Since the circuit protection valves 30.1, 30.2, 30.3, 30.4, 30.5, 30.6 must be frequently switched on and off to ventilate or fill the connected consumer circuits with compressed air, particularly when pressure storage tanks are small or missing, they wear out relatively quickly. Furthermore, the circuit protection valves are closed when de-energized, so that in the event of a malfunction of the electronic control unit 8, ventilation or filling of the consumer circuits with compressed air is no longer possible. Therefore, the invention provides a filling valve arrangement 42.1, 42.2,

[0038] 42.3, 42.4, 42.5 with a directly or indirectly electromagnetically switchable and passively opening filling valve 44, 52, 60, 66 and a bypass line 46 branched on the output side.

[0039] The filling valve 44, 52, 60, 66 is connected on the inlet side to the conveying line 10 or the supply line 28 and on the outlet side via parallel to the circuit protection valves 30.1, 30.2,

[0040] 30.3, 30.4, 30.5, 30.6 guided line branches 46.1, 46.2, 46.3, 46.4, 46.5, 46.6 of the bypass line 46 are connected to the line branches 28.1, 28.2, 28.3, 28.6 of the supply line 28 for the consumer circuits (supply connections a21, a22, a23, a24, a25, a26). The filling valve arrangement 42.1, 42.2, 42.3, 42.4, and 42.5 vents or fills all consumer circuits when the respective filling valve 44, 52, 60, 66 or an associated pilot valve 54 is de-energized, without the need to open the existing circuit protection valves 30.1–30.6. This avoids frequent switching operations of the circuit protection valves 30.1–30.6 and increases their service life. Furthermore, the consumer circuits are filled with compressed air even after a failure of the electronic control unit 8, which would then no longer allow the circuit protection valves 30.1–30.6, which are designed as solenoid valves, to be energized.

[0041] In the following, possible designs of the filling valve arrangement 42.1, 42.2, 2.3, 2.4, 2.5 are shown based on the compressed air supply systems 2.1, 2.2, 2.3, 2.4, 2.5 shown in Figures 1 to 5.

[0042] 42.2, 42.3, 42.4, 42.5.

[0043] In the compressed air supply system 2.1 shown in Fig. 1, a first embodiment of the filling valve arrangement 42.1 comprises a filling valve 44 designed as a 2 / 2-way solenoid valve, a pressure relief valve 48 connected downstream of the filling valve and the already mentioned bypass line 46. The bypass line 46 is connected on the inlet side to the supply line 28 and on the outlet side via its line branches 46.1, 46.2, 46.3, 46.4, 46.5, 46.6 to the outlet-side line sections of the line branches 28.1, 28.2,

[0044] 28.3, 28.6 of the supply line 28. In the line branches 46.1, 46.2,

[0045] 46.3, 46.4, 46.5, 46.6 of the bypass line 46 each have a check valve 50.1, 50.2, 50.3, 50.4, 50.5, 50.6 blocking the return flow direction.

[0046] The filling valve 44 is open when energized and closed when energized. It is connected to the electronic control unit 8 via an electrical control line shown in dash-dotted lines. When the filling valve 44 is de-energized and thus open, the consumer circuits are vented or filled from the supply line 28, bypassing the circuit protection valves 30.1 - 30.6, via the bypass line 46 and its line branches 46.1 - 46.6. The supply pressure of all consumer circuits is limited to a specified maximum pressure via the pressure relief valve 48. The aforementioned check valves 50.1 - 50.6 prevent backflow of compressed air from the consumer circuits and pressure equalization between the consumer circuits. The filling valve arrangement 42.1 is arranged entirely within the multi-circuit protection valve 6.1. In the second compressed air supply system 2 shown in Fig. 2.2, the second embodiment of the filling valve arrangement 42.2 there differs from the first embodiment of the filling valve arrangement 42.1 according to Fig. 1 in that the filling valve 52 is now designed as a pressure-controlled 2 / 2-way switching valve, which is closed when the control input is depressurized and open when the control input is pressurized. This filling valve 52 is assigned a pilot valve 54 connected to the line branch 28.7 of the supply line 28. This pilot valve 54 is designed as a 3 / 2-way solenoid switching valve, via which a control line 56 connected to the control input of the filling valve 52 is connected to the supply line 28 in the de-energized state and to a vent outlet in the energized state. The pilot valve 54 is connected to the electronic control unit 8 via an electrical control line shown in dash-dotted lines.The filling valve 52 is thus open when the pilot valve 54 is de-energized, so that the functioning of the filling valve arrangement 42.2 according to Fig. 2 is largely identical to that of the first embodiment of the filling valve arrangement 42.1 according to Fig. 1. As can be seen, this filling valve arrangement 42.2 is also arranged within the multi-circuit protection valve 6.2. The described pressure-controlled design of the filling valve 52 has the advantage over the directly electrically controllable filling valve 44 according to Fig. 1 that its opening cross-section can be closed via the pilot valve 54 with a relatively small control current.

[0047] Fig. 3 shows a compressed air supply system 2.3 with a third embodiment of the filling valve arrangement 42.3, which differs from the first embodiment of the filling valve arrangement 42.1 according to Fig. 1 in that the bypass line 46 is initially branched downstream of the filling valve 44 into a line branch 46a for the high-pressure consumer circuits (supply connections a21, a22, a25), i.e., for the two service brake circuits (supply connections a21, a22) and the air suspension circuit (supply connection a25), as well as a line branch 46b for the low-pressure consumer circuits (supply connections a23, a24, a26). In addition, a pressure relief valve 58 is arranged in the line branch 46b for the low-pressure consumer circuits.

[0048] For this purpose, the two line branches 46a, 46b are each branched on the output side into line branches 46.1, 46.2, 46.5 and 46.3, 46.4, 46.6, respectively, which are connected to the associated line branches 28.1, 28.2, 28.5 of the high-pressure consumer circuits and to the associated line branches 28.3, 28.4, 28.6 of the low-pressure consumer circuits, respectively, and each have a check valve 50.1, 50.2, 50.5; 50.3, 50.4, 50.6 blocking in the return flow direction. By means of the pressure relief valve 58, only the supply pressure of the low-pressure consumer circuits (supply connections a23, a24, a26) is limited to a specified maximum pressure. In this version of the filling valve assembly 42.3, the supply pressure of the high-pressure consumer circuits (supply connections a21, a22, a25) is limited by the safety valve 16 of the air treatment unit 4. As can be seen, this filling valve assembly 42.3 is also located within the multi-circuit protection valve 6.3.

[0049] In a compressed air supply system 2.4 shown in Fig. 4, the fourth embodiment of the filling valve arrangement 42.4 therein differs from the third embodiment of the filling valve arrangement 42.3 according to Fig. 3 in that the filling valve 60 is now designed as a pressure-controlled relay valve, the working connection of which is connected to a vent outlet when the control input is unpressurized and to a pressure inlet with a large opening cross-section when the control input is pressurized. The relay valve 60 is arranged within the air treatment unit 4.4. The pressure inlet of the relay valve 60 is connected to the delivery line 10 via a connecting line 62, wherein the connecting line 62 runs between the dryer unit 12 and the check valve 14.

[0050] The working connection of the relay valve 60 is connected via an output connection a5 to the bypass line 46 of the multi-circuit protection valve 6.4. Analogous to the second embodiment of the filling valve arrangement 42.2 according to Fig. 2, the filling valve 60 is assigned a pilot valve 54 arranged within the multi-circuit protection valve 6.4 and connected to the line branch 28.7 of the supply line 28. The pilot valve 54 is designed as a 3 / 2-way solenoid valve, via which a control line 56, 64 connected to the control input of the filling valve 60 via a control connection a6 is connected to the supply line 28 in the de-energized state and to a vent outlet in the energized state. Thus, the working connection of the filling valve 60 is connected to the delivery line 10 with a large opening cross-section in the de-energized state of the pilot valve 54, so that the functioning of the filling valve arrangement 42.4 is largely identical to that of the second embodiment of the filling valve arrangement 2.2 according to Fig. 2. The design of the filling valve 60 as a pressure-controlled relay valve has the advantage, compared to the pressure-controlled switching valve 52 according to Fig. 2, that its large opening cross-section can be closed by means of the pilot valve 54 with a relatively small control current. The components of the filling valve arrangement 42.4 are clearly divided into the air treatment unit 4 and the multi-circuit protection valve 6.4.

[0051] Fig. 5 shows a compressed air supply system 2.5 with a fifth embodiment of a filling valve arrangement 42.5, which differs from the second embodiment of the filling valve arrangement 42.2 according to Fig. 2 and from the fourth embodiment of the filling valve arrangement 42.4 according to Fig. 4 in that the filling valve 66 is now designed as a pressure-controlled 2 / 2-way switching valve with two control inputs acting in the same direction, which is closed when at least one control input is depressurized and open when both control inputs are pressurized.

[0052] The filling valve 66 is located within the air treatment unit 4.5 and not in the multi-circuit protection valve 6.5. Furthermore, the filling valve 66 is connected on the inlet side via a connecting line 62 to the conveying line 10, which runs between the dryer unit 12 and the aforementioned check valve 14. On the outlet side, the filling valve 66 is connected via the output connection a5 to the bypass line 46 of the multi-circuit protection valve 6.5. Analogous to the second embodiment of the filling valve arrangement 42.2 according to Fig. 2 and the fourth embodiment of the filling valve arrangement 42.4 according to Fig. 4, the filling valve 66 is assigned a pilot valve 54 located within the multi-circuit protection valve 6.5 and connected to the line branch 28.7 of the supply line 28.

[0053] The pilot valve 54 is designed as a 3 / 2-way solenoid valve, via which a control line 56, 64 connected to the first control input of the filling valve 66 via a control connection a6 is connected to the supply line 28 in the de-energized state and to a vent outlet in the energized state. The second control input of the filling valve 66 is connected directly to the conveying line 10 between the dryer unit 12 and the check valve 14.

[0054] The filling valve 66 is thus open when the pilot valve 54 is de-energized and the delivery line 10 is pressurized, so that the functioning of the filling valve arrangement 42.5 is largely identical to that of the second embodiment of the filling valve arrangement 42.2 according to Fig. 2 and the fourth embodiment of the filling valve arrangement 42.4 according to Fig. 4.

[0055] A further difference from the described versions of the filling valve arrangement 42.1, 42.2, 42.3, 42.4 is that the filling valve arrangement 42.5 does not have a separate pressure relief valve 48, 58, but instead the safety valve 16.5 of the air treatment unit 4.5 is pressure-controlled. The control input of the safety valve 16.5 is connected to the control line 64 of the filling valve 66 and, in the pressurized state, leads to a reduction in the control pressure of the safety valve 16.5, and thus to a reduction in the maximum discharge pressure in the discharge line 10. Due to the omission of the pressure relief valve 48, 58, the multi-circuit protection valve 6.5 has a simpler design and can be made more compact.

[0056] List of reference symbols (part of the description)

[0057] 2 Compressed air supply system (state of the art)

[0058] 2.1 Compressed air supply system (first embodiment)

[0059] 2.2 Compressed air supply system (second embodiment)

[0060] 2.3 Compressed air supply system (third embodiment)

[0061] 2.4 Compressed air supply system (fourth embodiment)

[0062] 2.5 Compressed air supply system (fifth embodiment)

[0063] 4 Air treatment unit

[0064] 4.4, 4.5 Air treatment units

[0065] 6 Multi-circuit protection valve

[0066] 6.1 - 6.5 Multi-circuit protection valves

[0067] 8 Electronic control unit

[0068] 10 conveyor line

[0069] 12 Dryer unit

[0070] 14 Check valve

[0071] 16 Safety valve, pressure relief valve

[0072] 16.5 Safety valve, pressure-controlled pressure relief valve

[0073] 18 vent valve

[0074] 20 silencers

[0075] 22 Regeneration line

[0076] 24 throttle valve

[0077] 26 Check valve

[0078] 28 supply line

[0079] 28.1 - 28.7 Branches of the supply line

[0080] 30.1 - 30.6 Circuit protection valves, 2 / 2-way solenoid valves

[0081] 32 Regeneration control valve

[0082] 34 Compressor control valve

[0083] 36 Control line

[0084] 38.1 - 38.4 Pressure sensors

[0085] 40.1 - 40.4 T em perature sensors

[0086] 42.1 - 42.5 Filling valve arrangements

[0087] 44 Filling valve, 2 / 2-way solenoid valve

[0088] 46 Bypass line 46a - 46b Line branches of the bypass line

[0089] 46.1 - 46.6 Line branches of the bypass line

[0090] 48 Pressure relief valve

[0091] 50.1 - 50.6 Check valves

[0092] 52 Filling valve, pressure-controlled 2 / 2-way switching valve

[0093] 54 Pilot valve, 3 / 2-way solenoid valve

[0094] 56 Control line

[0095] 58 Pressure relief valve

[0096] 60 Filling valve, relay valve

[0097] 62 connecting cable

[0098] 64 control line

[0099] 66 Filling valve, pressure-controlled 2 / 2-way switching valve a1 First inlet connection a1 .2 Second inlet connection a2 First outlet connection a4 Third inlet connection a5 Second outlet connection a6 Control connection a21 Supply connection of the first service brake circuit a22 Supply connection of the second service brake circuit a23 Supply connection of the parking and trailer brake circuit a24 Supply connection of the auxiliary consumer circuit a25 Supply connection of the air suspension circuit a26 Supply connection of the second auxiliary consumer circuit a27 Control connection of the compressor

Claims

Patent claims 1. Electronically controllable compressed air supply system (2.1, 2.2, 2.3, 2.4, 2.5) of a vehicle, with an air treatment unit (4, 4.4, 4.5) which is connected to a compressor via a delivery line (10) and has a dryer unit (12) connected to the delivery line (10) and a safety valve (16) connected to the delivery line (10), and in which a multi-circuit protection valve (6.1, 6.2, 6.3, 6.4, 6.5) is connected to the delivery line (10) via a supply line (28) branched on the output side, wherein the line branches (28.1, 28.2, 28.3, 28.4, 28.5, 28.6) of the supply line (28) are connected to supply connections (a21, a22, a23, a24, a25, a25, a26) are led by consumer circuits, wherein at least one of the line branches (28.1, 28.2, 28.3, 28.4, 28.5, 28.6) an electromagnetically actuated, passively closing circuit protection valve (30.1, 30.2, 30.3, 30.4, 30.5, 30.6) is arranged, and in which an electronic control unit (8) is present, which is connected to the line branches (28.1, 28.2, 28.3, 28.4, 28.5, 28.6) of the supply line (28) of some consumer circuits connected pressure sensors (38.1, 38.2, 38.3, 38.4) via sensor lines, characterized in that a filling valve arrangement (42.1, 42.2, 42.3, 42.4, 42.5) with a directly or indirectly electromagnetically switchable, passively opening filling valve (44, 52, 60, 66) and a bypass line (46) branched on the output side is present, wherein the filling valve (44, 52, 60, 66) is connected on the inlet side to the delivery line (10) or to the supply line (28) and on the outlet side via parallel to the circuit protection valves (30.1, 30.2, 30.3, 30.4, 30.5, 30.6) guided line branches (46.1, 46.2, 46.3, 46.4, 46.5, 46.6) of the bypass line (46) are connected to the line branches (28.1, 28.2, 28.3, 28.4, 28.5, 28.6) of the supply line (28) for the consumer circuits.

2. Compressed air supply system according to claim 1, characterized in that the filling valve (44) is designed as a 2 / 2-way solenoid valve with an inlet connection and a working connection, that the inlet connection of the filling valve (44) is connected to the delivery line (10) or to the supply line (28) and the working connection of the filling valve (44) is connected to the bypass line (46), and that the working connection of the filling valve (44) is connected to the inlet connection when the filling valve (44) is not energized and is closed off from the inlet connection of the filling valve (44) when energized.

3. Compressed air supply system according to claim 1, characterized in that the filling valve is designed as an electromagnetically controllable relay valve with a pressure inlet, a working connection and a venting outlet, that the pressure inlet is connected to the feed line (10) or the supply line (28) and the working connection is connected to the bypass line (46), and that the working connection is connected to the pressure inlet and is blocked off from the venting outlet in the de-energized state of the filling valve with a large opening cross-section, and is connected to the venting outlet and is blocked off from the pressure inlet in the energized state.

4. Compressed air supply system according to claim 1, characterized in that the filling valve (52) is designed as a pressure-controlled 2 / 2-way switching valve with an inlet connection and a working connection, that the inlet connection of the filling valve (52) is connected to the delivery line (10) or to the supply line (28) and the working connection is connected to the bypass line (46), that the working connection is connected to the inlet connection when the control inlet of the filling valve (52) is pressurized and is shut off from the inlet connection when the control inlet is depressurized, and that a 3 / 2-way solenoid switching valve is assigned to the filling valve (52) as a pilot valve (54), via which the control inlet of the filling valve (52) is connected to the delivery line (10) or the supply line (28) when the pilot valve (54) is not energized and to a vent outlet when the pilot valve (54) is energized.

5. Compressed air supply system according to claim 1, characterized in that the filling valve (60) is designed as a pressure-controlled relay valve with a pressure inlet, a working connection and a venting outlet, that the pressure inlet of the filling valve (60) is connected to the delivery line (10) or the supply line (28) and the working connection of the filling valve (60) is connected to the bypass line (46), that the working connection of the filling valve (60) is connected to the inlet connection of the filling valve (60) when the control inlet of the filling valve (60) is pressurized and has a large opening cross-section and is closed off from a venting outlet of the filling valve (60), and that the filling valve (60) is connected to the venting outlet of the filling valve (60) and closed off from the inlet connection of the filling valve (60) when the control inlet of the filling valve (60) is depressurized, and that a 3 / 2-way solenoid valve is connected to the filling valve (60) as a pilot valve (54) as the pilot valve. is assigned,via which the control input of the filling valve (60) in, in the de-energized state of the pilot control valve (54) it is connected to the delivery line (10) or the supply line (28) and in the energized state of the pilot control valve (54) it is connected to a vent outlet.

6. Compressed air supply system according to claim 1, characterized in that the filling valve (66) is designed as a pressure-controlled 2 / 2-way switching valve with two control inputs acting in the same direction, an input connection and a working connection, that the inlet connection of the filling valve (66) is connected to the delivery line (10) or the supply line (28) and the working connection of the filling valve (66) is connected to the bypass line (46), that the working connection of the filling valve (66) is blocked off with the inlet connection of the filling valve (66) at both pressurized control inputs and with at least one pressureless control input from the inlet connection of the filling valve (66), that a 3 / 2-way solenoid switching valve is assigned to the filling valve (66) as a pilot valve (54),via which the first control input of the filling valve (66) is connected to the delivery line (10) or the supply line (28) in the de-energized state of the pilot control valve (54) and to a vent outlet in the energized state of the pilot control valve (54), and that the second control input of the filling valve is directly connected to the delivery line (10) or the supply line (28).

7. Compressed air supply system according to one of claims 1 to 6, characterized in that a pressure relief valve (48) is arranged in the bypass line (46) before the branching into the line branches (46.1, 46.2, 46.3, 46.4, 46.5, 46.6) of all consumer circuits.

8. Compressed air supply system according to one of claims 1 to 6, characterized in that a pressure relief valve (58) is arranged in a line branch (46b) of the bypass line (46) before the branching into the line branches (46.3, 46.4, 46.6) of the low-pressure consumer circuits.

9. Compressed air supply system according to one of claims 1 to 8, characterized in that the safety valve (16.5) of the air treatment unit (4.5) is designed to be pressure-controlled, that the control pressure of the safety valve is reduced when the control input is pressurized, and that the control input of the safety valve (16.5) is connected to a Control line (56, 64) is connected between the pilot valve (54) and the first control input of the filling valve (66).

10. Compressed air supply system according to one of the preceding claims, characterized in that in the line branches (46.1, 46.2, 46.3, 46.4, 46.5, 46.6) of the bypass line (46) for the consumer circuits there is arranged a check valve (50.1, 50.2, 50.3, 50.4, 50.5, 50.6) which blocks the return flow direction.

11. Compressed air supply system according to one of the preceding claims, characterized in that the multi-circuit protection valve has passively opening circuit protection valves for service brake circuits and passively closing circuit protection valves for other consumer circuits.

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