CONDITIONING DEVICE FOR A TEST BENCH

Description

[0001] The invention relates to a conditioning device for supplying a test specimen on a test bench with a conditioned fluid, wherein the conditioning device has a fluid line that connects a fluid inlet to a fluid outlet, wherein unconditioned fluid can be supplied to the conditioning device via the fluid inlet and conditioned fluid can be supplied to the test specimen via the fluid outlet, and wherein at least one conditioning unit for changing a state variable of the fluid is provided in the fluid line between the fluid inlet and the fluid outlet. The invention further relates to a test bench with a test specimen and with a conditioning device for supplying the test specimen with a conditioned fluid, as well as a use of the conditioning device for supplying a test specimen on a test bench with a conditioned, in particular gaseous, fluid.

[0002] Conditioning systems are used on test benches to condition a liquid or gaseous fluid, e.g. an operating fluid such as air, lubricant or fuel, or a cooling fluid such as cooling air or coolant, to certain predetermined state variables and to supply it to a test object. The type of fluid and the state variables to be set depend heavily on the test object. For example, individual components of a vehicle, such as gearboxes, axles, heat exchangers such as radiators or condensers, etc., or drive units such as combustion engines, electric motors, fuel cell drives or hybrid units are used as test objects. Subsystems such as vehicle drive trains or entire vehicles can also be used as test objects. Depending on the type of test object to be tested, the test bench can be designed in different ways, for example as a component test bench, engine test bench, drive train test bench or vehicle orRoller test bench. The conditioned fluid is used to test the respective test object under various operating conditions. For this purpose, it is often desired to condition one or more state variables of the fluid used to certain specified conditions, e.g., to a specific temperature, pressure, humidity, flow rate, etc. Depending on the application, it may be desirable, for example, to keep the state variables as constant as possible over a certain period of time, or it may also be desired to set a specific desired temporal progression of a state variable.

[0003] Conditioning devices are known, for example, from EP 1 600 622 B1, AT 520886 B1, or EP 3 293 504 B1. EP 1 600 622 B1 discloses a device and a method for supplying an internal combustion engine with a conditioned combustion gas. AT 520886 B1 discloses a test bench for a test specimen, comprising an inlet line through which an inlet gas is conducted to the test specimen, and an exhaust line through which exhaust gas is discharged from the test specimen. EP 3 293 504 B1 discloses a method for regulating or controlling the thermal conditions on a test bench. However, with known conditioning devices, dynamic operation with rapid changes in a state variable of the fluid, in particular the flow rate, is only inadequately possible.

[0004] Furthermore, DE 10 2006 015 011 A1 discloses a device for controlling the setpoint of an inlet and outlet pressure in a fluid supply line and a fluid discharge line, which are connected to a flow device subject to a time-variable pressure and / or temperature change. The fluid supply line and the fluid discharge line are connected to each other via at least one bypass line.

[0005] WO 2020 / 237278 A1 discloses a vehicle test bench for testing a vehicle. The vehicle test bench has a coolant conditioner connected to a coolant circuit of the vehicle under test via a fluid line. This allows the coolant of the vehicle's coolant circuit to be routed between the coolant conditioner and the test objects (e.g., internal combustion engine, electric machine, frequency converter). Each individual test object has a cooling circuit formed by a partial circuit of the vehicle's cooling circuit between the respective test object and the radiator.

[0006] It is therefore an object of the invention to provide a conditioning device which is of simple construction and with which the most dynamic operation possible with rapid changes in a state variable in a value range of the state variable which is as variable as possible is possible.

[0007] The object is achieved according to the invention in that a first bypass line is provided for setting a predetermined, preferably constant, flow rate of the fluid in the first bypass line, which connects a first bypass outlet from the fluid line, located between the fluid inlet and the at least one conditioning unit, with a first bypass inlet into the fluid line, located between the at least one conditioning unit and the fluid outlet, that a second bypass line is provided for setting a variable flow rate of the fluid in the second bypass line, which connects a second bypass outlet from the fluid line, located between the first bypass outlet and the at least one conditioning unit, with a second bypass inlet into the fluid line, located between the at least one conditioning unit and the first bypass inlet,that a first flow measuring device is provided in the fluid line between the first bypass inlet and the second bypass inlet, and that a first, preferably electrically controllable, actuator for varying the fluid mass flow is provided in the fluid line between the first bypass inlet and the fluid outlet or between the fluid inlet and the first bypass outlet. The combination of the two bypass lines enables highly variable control of the fluid flow rate over a wide range of values, down to a reduction of the flow rate at the fluid outlet to zero and without significantly reducing the measurement accuracy of the flow rate. In addition, the recirculation of the conditioned fluid in the conditioning device via the bypass lines can reduce the energy required for conditioning the fluid.

[0008] According to the invention, a second, preferably electrically controllable, actuator for adjusting the variable flow rate of the fluid is provided in the second bypass line, and / or a throttle element for adjusting the predetermined, preferably constant, flow rate and a second flow measuring device are provided in the first bypass line. This creates a simple structural embodiment that enables precise control of the flow rate with rapid changes.

[0009] It can be advantageous if several conditioning units, each for changing a state variable of the fluid, are arranged between the second bypass outlet and the second bypass inlet, preferably in series, in the fluid line. For example, a conveying device and / or a heat sink and / or a heat source and / or a humidifier and / or a dryer can be provided as the conditioning unit. The conveying device can be a pump or a blower, for example, and a heat exchanger can be provided as the heat sink. An electric heater or a heat exchanger, for example, can be provided as the heat source, and a steam generator, for example, can be provided as the humidifier. This enables more flexible use of the conditioning unit for both gaseous and liquid fluids in various applications.

[0010] The conditioning device can preferably also comprise a housing, wherein at least the at least one conditioning unit is arranged in the housing. Advantageously, at least the second bypass line is also arranged in the housing, with both bypass lines particularly preferably being arranged in the housing. The fluid outlet and / or the fluid inlet can be arranged on the housing or outside the housing. This creates a compact device that is better protected from external influences, e.g., thermal or mechanical.

[0011] A conditioning device control unit is preferably provided in the conditioning device for controlling the conditioning device, wherein the conditioning device control unit is preferably arranged in the housing. The conditioning device control unit is preferably connected to the first and second flow measuring devices for receiving measured values. Preferably, the conditioning device control unit is also connected to the at least one conditioning unit for controlling the at least one conditioning unit and / or to the first and / or second actuator for controlling the first and / or second actuator. This creates a substantially self-sufficient device.

[0012] The conditioning device control unit can also have a communication interface for connecting the conditioning device to a higher-level control unit. This allows the conditioning device to be advantageously integrated into a test bench control system and controlled centrally. The present invention will be described below with reference to Figuren 1 bis 2 which show exemplary, schematic and non-limiting advantageous embodiments of the invention. Fig.1 a conditioning device in an advantageous embodiment and Fig.2 a test bench with a test specimen and a conditioning device.

[0013] In Fig.1 An advantageous embodiment of the conditioning device 1 according to the invention is shown. The conditioning device 1 has a fluid line 2, which fluidically connects a fluid inlet 2E with a fluid outlet 2A, so that a fluid can flow from the fluid inlet 2E to the fluid outlet 2A. The conditioning device 1 is particularly preferably used for conditioning a gaseous fluid, in particular air, on a test bench, as will be described below with reference to Fig.2 will be explained in more detail below. At least one conditioning unit K for conditioning the fluid is provided in the fluid line 2. Conditioning is generally understood to mean the modification of one or more state variables of the fluid in order to set a predetermined value of the state variables. Known state variables include, for example, pressure, temperature, flow rate (volume flow or mass flow), humidity, etc.

[0014] In the conditioning device 1, a first bypass line 3 is provided for setting a temporally constant flow rate of the fluid in the first bypass line 3, which connects a first bypass outlet 3A of the fluid line 2, located between the fluid inlet 2E and the at least one conditioning unit K, with a first bypass inlet 3E of the fluid line 2, located between the at least one conditioning unit K and the fluid outlet 2A. Furthermore, a second bypass line 4 is provided in the conditioning device 1 for setting a temporally variable flow rate of the fluid in the second bypass line 4, which connects a second bypass outlet 4A of the fluid line 2, located between the first bypass outlet 3A and the at least one conditioning unit K, with a second bypass inlet 4E of the fluid line 2, located between the at least one conditioning unit K and the first bypass inlet 3E.

[0015] A first flow measuring device 5 is provided in the fluid line 2 between the first bypass inlet 3E and the second bypass inlet 4E, and a first actuator 6, preferably electrically controllable, for varying the flow rate of the fluid is provided in the fluid line 2 between the first bypass inlet 3E and the fluid outlet 2A. However, the first actuator 6 could, in principle, also be arranged between the fluid inlet 2E and the first bypass outlet 3A in the fluid line 2. Within the scope of the invention, the flow rate of the fluid is understood to mean a fluid mass flow or a fluid volume flow.

[0016] In order to be able to change the flow rate in the second bypass line 4, a second actuator 7, which can preferably be controlled electrically, can be provided in the second bypass line 4. In order to achieve a constant flow rate in the first bypass line 3, a throttle element 9 is preferably provided. As is known, a throttle element 9 is understood to be a device that has a smaller flow cross-section than the first bypass line 3. In the simplest case, the flow cross-section of the throttle element 9 can be fixed, so that, for example, an orifice plate with a fixed flow cross-section can be provided as the throttle element 9. Preferably, however, the flow cross-section of the throttle element 9 is variable, for example, manually adjustable, in order to be able to calibrate the conditioning device 1.However, the throttle element 9 could also be designed, for example, as a preferably electrically controllable actuator, analogous to the actuators 6, 7. During operation of the conditioning device 1, however, the flow cross-section of the throttle element 9 is preferably no longer changed.

[0017] In order to be able to measure a flow rate (volume flow or mass flow) of the fluid, a second flow measuring device 8 is preferably also provided in the first bypass line 3, which in the example shown is arranged between the first bypass outlet 3A and the throttle device 9. By combining the two bypass lines 3, 4, a portion of the conditioned fluid can be recirculated in the conditioning device 1 depending on the desired flow rate at the fluid outlet 2A, thereby enabling highly variable control of the flow rate over a wide range of values, up to and including a reduction of the flow rate at the fluid outlet 2A to zero. Recirculation is understood to mean the withdrawal of conditioned fluid downstream of the at least one conditioning unit K and the supply upstream of the at least one conditioning unit K.

[0018] Common sensors suitable for measuring the flow rate of the fluid (volume flow or mass flow) can be used as flow measuring devices 5, 8. Suitable flow measuring devices 5, 8 are, for example, differential pressure sensors, such as orifice plates, ultrasonic sensors, magnetic-inductive sensors, Coriolis sensors, etc. Control valves with servo gear motors are preferably used as electrically controllable actuators 6, 7. In order to enable the most dynamic operation of the conditioning device 1, flow measuring devices 5, 8 with the shortest possible response time are preferably used so that changes in the flow rate can be detected with the shortest possible time delay. Likewise, actuators 6, 7 with the shortest possible switching times are preferably used so that rapid response to control commands can be achieved.The T90 response time of the flow measuring devices 5, 8 is preferably a maximum of 1 second and control valves with servo planetary gear motors with a speed of 200 rpm ±10% are preferably used as actuators 6, 7.

[0019] In order to be able to change several state variables of the fluid, preferably several conditioning units K are provided, which can be arranged, for example, in series between the second bypass outlet 4A and the second bypass inlet 4E in the fluid line 2. In the example according to Fig.1 For example, viewed in the flow direction S, a conveying device 10 is provided for conveying the fluid or for generating a pressure gradient. Downstream, a heat sink 11, a heat source 12, and a humidifier 13 are provided. Further conditioning units K, such as a dryer (not shown), could also be provided additionally. The specific design depends essentially on the intended use of the conditioning device 1 and, in particular, on the type of fluid used (gaseous or liquid). Typically, at least one conveying device 10, a heat sink 11, and a heat source 12 are provided. A humidifier 13 can be omitted, for example, if no change in the air humidity is required.

[0020] In the case of a liquid fluid, a suitable pump can be provided as the conveying device 10, for example. In the case of a gaseous fluid, such as air, a blower can be provided as the conveying device 10. In the simplest case, the conveying device 10 could, for example, be designed such that it generates a constant, unchanging flow rate during operation of the conditioning device 1. However, the conveying device 10 could also be variably controllable in order to be able to variably change the pressure gradient and consequently the flow rate. The control or regulation of the (total) flow rate can, for example, be carried out via a speed control of the conveying device 10, e.g. by means of a characteristic map-based control or by means of a control depending on an actual value. The actual value can, for example,be detected by an additional (not shown) flow measuring device, which can be arranged, for example, between the second bypass outlet 4A and the conveying device 10 in the fluid line 2.

[0021] A suitable heat exchanger, for example, can be provided as heat sink 11 and / or heat source 12. A suitable electrical heating device could also be provided as heat source 12, and a steam generator, for example, can be provided as humidifier 13. Of course, one or more measuring devices (not shown) can also be provided for detecting a state variable, for example a temperature sensor, a pressure sensor, or a humidity sensor. The at least one conditioning unit K can, for example, be arranged in a preferably closed housing 14, so that the at least one conditioning unit K is protected from external influences and insulated from the environment. The second bypass line 4 or both bypass lines 3, 4 could of course also be arranged in the housing 14.The fluid outlet 2A and / or the fluid inlet 2E could, for example, also be arranged directly on the housing 4 in order to create a compact conditioning device 1. Of course, the fluid outlet 2A and / or the fluid inlet 2E could also be located outside the housing 14, as in . Fig.1 is shown.

[0022] A conditioning device control unit 15 for controlling the conditioning device 1 can also be provided in the conditioning device 1. The conditioning device control unit 15 is provided in particular for controlling the at least one conditioning unit K and / or for controlling the first and / or second actuator 6, 7. The conditioning device control unit 15 is preferably also connected to the first and / or second flow measuring device 5, 8 in order to receive measured values of the flow rate (volume flow or mass flow). The conditioning device control unit 15 can, for example, be arranged in a common housing 14 with the conditioning unit(s) K. It can also be advantageous if the conditioning device control unit 15 has a communication interface 16 for connecting the conditioning device 1 to a higher-level control unit 17.The above-mentioned possible additional measuring devices can of course also be connected to the conditioning device control unit 15 in order to transmit the recorded measured values (e.g. temperature, pressure, humidity) to the conditioning device control unit 15.

[0023] As a result, the conditioning device 1 can be integrated, for example, into a test bench 18 and controlled by a test bench control unit 20 ( Fig.2 ). The conditioning device control unit 15 can, for example, have suitable hardware and / or software. Preferably, a suitable control unit is also provided in the conditioning device control unit 15 and / or in the test bench control unit 20, with which one or more state variables of the fluid can be controlled to predetermined setpoints. The control unit can, for example, contain a suitable controller, such as a PI controller or PID controller, model-based controller or 2-degree-of-freedom controller. A simulation model 21 for simulating an operating state of a test object P can also be implemented in the conditioning device control unit 15 and / or in the test bench control unit 20, as will be described below with reference to Fig.2 will be explained in more detail.

[0024] In Fig.2 A test bench 18 is shown for carrying out a test run with a test specimen P and with a conditioning device 1 for supplying the test specimen P with a conditioned fluid. The conditioning device 1 can, for example, be designed according to Fig.1 be formed, wherein the fluid outlet 2A of the conditioning device 1 is connected to a fluid inlet PE of the test object P. For example, a closed conditioning circuit can be realized by connecting a fluid outlet PA of the test object P, which communicates with the fluid inlet PE, to the fluid inlet 2E of the fluid line 2 of the conditioning device 1. The connection can be made, for example, via a suitable pipeline, as in Fig.2 is indicated by dashed lines. If necessary, other test specimens not shown could also be supplied with conditioned fluid by the conditioning device 1.

[0025] However, an open conditioning circuit could also be provided, in which the fluid inlet 2E of the fluid line 2 of the conditioning device 1 is connected to an external fluid source and the fluid outlet PA of the test object P is connected to an external fluid sink. The test object P can, for example, be arranged in a closed test cell 19 of the test bench 18, as shown in Fig.2 is indicated by the dashed outline. The fluid source could, for example, be arranged inside or outside the test cell 19. Alternatively or additionally, the fluid sink could also be provided inside or outside the test cell 19. The conditioning device 1 can be arranged inside the test cell 19, as in Fig.1 indicated by the test cell 19a. However, the conditioning device 1 could also be arranged outside the test cell 19 and connected to the test object P by one or more suitable lines.

[0026] For example, individual components of a vehicle, a drive train of a vehicle or the entire vehicle can be used as the test object P. In this case, one also speaks of a component test bench, drive train test bench or vehicle or roller test bench. Depending on the type of test object P used, different fluids to be conditioned may be required, for example operating fluids required for the operation of the test object P, such as air or fuel, or cooling fluids for cooling the test object P, such as cooling air or liquid coolant. If, for example, an internal combustion engine or a fuel cell is used as the test object P, the conditioning device 1 can be used, for example, to condition air, which is required as an operating fluid for the operation of the internal combustion engine or the fuel cell. In this case, an open conditioning circuit is preferably provided, wherein the fluid source, for example,The fluid sink can also be the ambient air of the test cell 19, 19a and thus lies within the test cell 19, 19a. In this case, the fluid sink is preferably located outside the test cell 19, 19a and can, for example, be a suitable exhaust air system or exhaust gas system, which may include exhaust gas measurement technology.

[0027] The conditioning device 1 can, however, also be used, for example, to condition a gaseous cooling fluid such as cooling air. For example, the test bench 18 could be a roller dynamometer and the test object P could be a vehicle with an internal combustion engine. In this case, the conditioning device 1 could, for example, be used to condition air flowing through a heat exchanger of the vehicle (e.g. charge air cooler or water cooler) in order to simulate the airstream. In this case, too, the fluid source can, for example, be the ambient air of the test cell 19, 19a and thus lie within the test cell 19, 19a. The fluid sink could also be located within the test cell or, if necessary, outside if the air heated or used by the test object is collected and discharged from the test cell 19, 19a.

[0028] The conditioning device 1 can, however, also be used, for example, to condition a liquid fluid such as water, oil, fuel, or coolant. For example, the test bench 18 could be a transmission test bench, and the test object P could be a transmission of a vehicle. In this case, the conditioning device 1 could be used, for example, to condition transmission oil. For example, the test bench 18 could also be an engine, fuel cell, or battery test bench, and the test object P could be an internal combustion engine or electric motor, a fuel cell, or a battery. In this case, the conditioning device 1 could, for example, be used to condition coolant that is used to cool the test object P and flows through the test object P. In this case, a closed conditioning circuit is preferably also provided.

[0029] The test bench 18 preferably has a test bench control unit 20 for controlling the test bench 18. The test bench control unit 20 can, for example, in turn have suitable hardware and / or software. A load machine B for driving or loading the test object P can also be provided on the test bench 18. The load machine B can, for example, be an electrical machine, such as an asynchronous machine, in a known manner. The test object P and, if necessary, various other functions of the test bench 18 can be controlled via the test bench control unit 20, for example the preferably automated execution of a predetermined test run with the test object P, measurement data acquisition on the test object P, or the control of the conditioning device 1, etc.The loading machine B can also be controlled via the test bench control unit 20 in order to simulate certain loads on the test specimen P when carrying out a predetermined test run.

[0030] The conditioning device 1 could be controlled directly by the test bench control unit 20 by connecting the at least one conditioning unit K and / or the first and / or second actuator 6, 7 and / or the first and / or second flow measuring device 5, 8 directly to the test bench control unit 20. In this case, a separate conditioning device control unit 15 could also be dispensed with. However, the conditioning device 1 could also be controlled indirectly by the test bench control unit 20 by connecting the conditioning device control unit 15 of the conditioning device 1 to the test bench control unit 20 via the communication interface 16, as shown in Fig.2 is shown. Control commands such as setpoints could then be transmitted from the higher-level test bench control unit 20 to the conditioning device control unit 15, and the conditioning device control unit 15 controls or regulates the available conditioning units K in order to adjust the at least one state variable.

[0031] A simulation model 21 for simulating an operating state of a test object P is preferably also implemented in the conditioning device control unit 15 and / or in the test bench control unit 20. Based on the simulation model 21, the conditioning device control unit 15 and / or the test bench control unit 20 can change the at least one state variable of the fluid by controlling or regulating the at least one conditioning unit K. For example, temporal profiles of one or more state variables of the fluid can be simulated using the simulation model 21. For example, an internal combustion engine can be used as the test object P on the test bench 18, and the conditioning device 1 can be used to condition air as the operating fluid for the internal combustion engine. For example, a virtual journey of a vehicle in which the internal combustion engine is used can be simulated using the simulation model 21.For example, the environmental conditions of the virtual vehicle can be simulated on a virtual test drive. This could, for example, involve an altitude simulation with a temporally varying ambient pressure and a temporally varying ambient temperature.

[0032] The simulation model 21 can, for example, provide a constant setpoint or a variable temporal progression of a setpoint for one or more state variables of the fluid. The setpoint or the progression of the setpoint can be adjusted by the conditioning device control unit 15 and / or the test bench control unit 20, for example, using a suitable control unit. For this purpose, available measured values can be supplied to the conditioning device control unit 15 and / or the test bench control unit 20 as actual values, and the conditioning device control unit 15 and / or the test bench control unit 20 can transmit manipulated variables to the available actuators.

[0033] In the example shown, the measured flow rate (e.g., fluid mass flow or fluid volume flow) of the first and second flow measuring devices 5, 8 is supplied to the conditioning device control unit 15 as actual values, and manipulated variables are transmitted to the first and second actuators 6, 7. This allows a setpoint value of the flow rate (e.g., fluid mass flow) specified by the simulation model 21 to be regulated, which is supplied to the test object P. Preferably, the (total) flow rate of the fluid through the conditioning device 1 is kept substantially constant, for example, by appropriate control of the conveying device 10, and the control to the setpoint value is achieved by opposing opening and closing of the actuators 6, 7.

[0034] This allows, for example, fluctuating conditions of the unconditioned fluid (e.g., air) that is supplied to the conditioning device 1 via the fluid inlet 2E to be compensated for. To achieve the highest possible control dynamics, as already mentioned, preferably measuring devices (e.g., flow measuring devices 5, 8) with the shortest possible delay time for the measured value acquisition and actuators (e.g., electrically controllable actuators 6, 7) with the shortest possible switching time are used. In the example shown in Fig.2 The simulation model 21 is implemented in the test bench control unit 20. Of course, the simulation model 21 could also be implemented in the conditioning device control unit 15.

Claims

1. Conditioning device (1) for supplying a device under test (P) on a test bench (18) with a conditioned fluid, wherein the conditioning device (1) has a fluid line (2) which connects a fluid inlet (2E) to a fluid outlet (2A), wherein unconditioned fluid can be supplied to the conditioning device (1) via the fluid inlet (2E), and conditioned fluid can be supplied to the device under test (P) via the fluid outlet (2A), and wherein at least one conditioning unit (K) for changing a state variable of the fluid is provided in the fluid line (2) between the fluid inlet (2E) and the fluid outlet (2A), wherein a first bypass line (3) is provided for adjusting a predetermined flow rate of the fluid in the first bypass line (3) connecting a first bypass outlet (3A) from the fluid line (2), which is located between the fluid inlet (2E) and the at least one conditioning unit (K), to a first bypass inlet (3E) into the fluid line (2), which is located between the at least one conditioning unit (K) and the fluid outlet (2A), wherein a second bypass line (4) is provided for adjusting a variable flow rate of the fluid in the second bypass line (4) connecting a second bypass outlet (4A) from the fluid line (2), which is located between the first bypass outlet (3A) and the at least one conditioning unit (K), to a second bypass inlet (4E) into the fluid line (2), which is located between the at least one conditioning unit (K) and the first bypass inlet (3E), characterized in that a first flow measuring device (5) is provided in the fluid line (2) between the first bypass inlet (3E) and the second bypass inlet (4E), in that a first control element (6), preferably being electrically controlled, is provided in the fluid line (2) between the first bypass inlet (3E) and the fluid outlet (2A), or between the fluid inlet (2E) and the first bypass outlet (3A) for changing the flow rate of the fluid, and in that a second control element (7), preferably being electrically controlled, is provided in the second bypass line (4) for adjusting the variable flow rate of the fluid, and / or in that a throttle (9) for adjusting the predetermined flow rate of the fluid and a second flow measuring device (8) are provided in the first bypass line (3).

2. Conditioning device (1) according to claim 1, characterized in that a plurality of conditioning units (K) for changing a state variable of the fluid in each case are arranged, preferably in series, between the second bypass outlet (4A) and the second bypass inlet (4E) in the fluid line (2).

3. Conditioning device (1) according to either of claims 1 to 2, characterized in that a conveying device (10) and / or a heat sink (11) and / or a heat source (12) and / or a humidifier (13) and / or a dryer are provided as the conditioning unit (K).

4. Conditioning device (1) according to claim 3, characterized in that a pump or a blower is provided as the conveying device (10), and / or in that a heat exchanger is provided as the heat sink (11), and / or in that an electric heating device or a heat exchanger is provided as the heat source (12), and / or in that a steam generator is provided as the humidifier (13).

5. Conditioning device (1) according to any of claims 1 to 4, characterized in that the conditioning device (1) comprises a housing, wherein at least the at least one conditioning unit (K) is arranged in the housing (14).

6. Conditioning device (1) according to claim 5, characterized in that at least the second bypass line (4) is arranged in the housing (14), wherein preferably both bypass lines (3, 4) are arranged in the housing (14), and in that the fluid outlet (2A) and / or the fluid inlet (2E) are arranged on the housing (4) or are located outside the housing (14).

7. Conditioning device (1) according to any of claims 1 to 6, characterized in that a conditioning device control unit (15) for controlling the conditioning device (1) is provided in the conditioning device (1), wherein the conditioning device control unit (15) is preferably arranged in the housing (14).

8. Conditioning device (1) according to claim 7, characterized in that the conditioning device control unit (15) is connected to the first and the second flow measuring device (5, 8) for receiving measured values, and / or in that the conditioning device control unit (15) is connected to the at least one conditioning unit (K) for controlling the at least one conditioning unit (K), and / or is connected to the first and / or second control element (6, 7) for controlling the first and / or second control element (6, 7), and / or in that the conditioning device control unit (15) has a communication interface (16) for connecting the conditioning device (1) to a higher-level control unit (17).

9. Test bench (18) with a device under test (P) and with a conditioning device (1) for supplying the device under test (P) with a conditioned fluid, characterized in that the conditioning device (1) is designed according to any of claims 1 to 8, and in that the fluid outlet (2A) of the conditioning device (1) is connected to a fluid inflow (PE) of the device under test (P).

10. Test bench (18) according to claim 9, characterized in that a closed conditioning circuit is provided by connecting a fluid outflow (PA) of the device under test (P), which outflow communicates with the fluid inflow (PE), to the fluid inlet (2E) of the fluid line (2) of the conditioning device (1), or in that an open conditioning circuit is provided by connecting the fluid inlet (2E) of the fluid line (2) of the conditioning device (1) to an external fluid source, and connecting the fluid outflow (PA) of the device under test (P) to an external fluid sink.

11. Test bench (18) according to claim 10, characterized in that the device under test (P) is arranged in a closed test cell (19, 19a), and in that the fluid source is provided inside or outside the test cell (19, 19a), and / or in that the fluid sink is provided inside or outside the test cell (19, 19a).

12. Test bench (18) according to any of claims 9 to 11, characterized in that a test bench control unit (20) for controlling the test bench (18) is provided on the test bench (18), wherein the conditioning device (1) can be controlled via the test bench control unit (20).

13. Test bench (18) according to claim 12, characterized in that the conditioning device (1) can be controlled directly by the test bench control unit (20) by connecting the at least one conditioning unit (K), and / or the first and / or second control element (6, 7), and / or the first and / or second flow measuring device (5, 8) directly to the test bench control unit (20), or in that the conditioning device (1) can be controlled indirectly by the test bench control unit (20) by connecting the conditioning device control unit (15) of the conditioning device (1) to the test bench control unit (20) via the communication interface (16), and / or in that a simulation model (21) for simulating an operating state of the device under test (P) is implemented in the test bench control unit (20) and / or in the conditioning device control unit (15), and in that the test bench control unit (20) and / or the conditioning device control unit (15) are designed to control the conditioning device (1) on the basis of the simulation model (21) to change the at least one state variable of the fluid, in particular to control the at least one state variable with respect to a setpoint value predetermined by the simulation model (21).

14. Use of the conditioning device (1) according to any of claims 1 to 8 for supplying a device under test (P) on a test bench (18) with a conditioned, in particular gaseous, fluid, wherein unconditioned fluid is supplied from the fluid inlet (2E) to the at least one conditioning unit (K), wherein the unconditioned fluid is conditioned in the at least one conditioning unit (K) by changing a state variable of the fluid by the conditioning unit (K), and wherein the conditioned fluid is supplied to the device under test (P) via the fluid outlet (2A) of the fluid line (2).

15. Use according to claim 14, wherein at least a portion of the conditioned fluid is recirculated in the conditioning device (1) by supplying the fluid that is downstream of the at least one conditioning unit (K), via the first and second bypass lines (3, 4), upstream of the at least one conditioning unit (K), and / or wherein a setpoint value of at least one state variable for the conditioned fluid to be supplied to the device under test (P) is predetermined to the conditioning device control unit (15) or to a higher-level test bench control unit (20) connected thereto, preferably by the simulation model (21), wherein at least one measured actual value of the state variable is transmitted to the conditioning device control unit (15) or the higher-level test bench control unit (20), and wherein the conditioning device control unit (15) or the higher-level test bench control unit (20) determines at least one manipulated variable for at least one control element of the conditioning device (1) on the basis of the setpoint value and the at least one actual value, and controls the at least one control element using the manipulated variable.

16. Use according to claim 15, wherein a flow rate of the fluid, preferably a fluid mass flow rate, is used as the state variable, wherein actual values of the flow rate of the fluid are detected by the first and the second flow measuring device (5, 8) and wherein the first and the second control element (6, 7) are used as control elements.