DE102017213449A1 - Network replica arrangement with integrated emergency shutdown, test rig arrangement and method - Google Patents

Abstract

The invention relates to a network replication arrangement (1) with a network replica (2) for simulating a motor vehicle electrical system and for measuring a test object (4) which can be coupled to the network replica arrangement (1) for electromagnetic compatibility, wherein the network replica arrangement (1) has a first source input (8, 9 ) for coupling to a first electrical potential of a power source (7) and an output (10) for coupling to the device under test (4), and wherein the network simulating device (1) comprises an at least partially electromagnetically shielding housing (6) in which the network replica (2) is arranged. In this case, the network replica arrangement (1) has a separating device (3) arranged in the housing (6), which is designed to separate at least the first source input (8, 9) from the output (10).

Description

The invention relates to a network simulator arrangement with a network simulator for simulating a motor vehicle electrical system and for measuring a coupled with the network replica assembly specimen for electromagnetic compatibility, wherein the network replica arrangement has a source input for coupling with an electrical potential of a power source and an output for coupling with the DUT, and wherein the network replica arrangement has an at least partially electromagnetically shielding housing in which the network replica is arranged. Furthermore, the invention also relates to a test rig arrangement with a test stand and a network simulating arrangement and a method.

A Line Impedance Stabilization Network (abbreviated to LISN) is generally an electrical device used to measure conducted emissions as part of measurements and tests for electromagnetic compatibility (EMC) as a replica of utility grids.

In order to perform EMC measurements on electrified drive systems of motor vehicles under real conditions but in a space-saving and compact manner, network replicas are used to simulate the electrical properties of the motor vehicle electrical system. Current network simulations for measurements on electrified drive systems usually consist of "conventional" 12V network replicas according to CISPR25, in which the dielectric strength was adapted according to the intended use. Furthermore, this network simulation housed in a shielding metal housing and are installed between a power source and the DUT, that is, the component of the drive system to be tested.

Furthermore, EMC measurements are usually performed on tables (Bench) in the quasistatic state, but also the implementation of such measurements by means of mobile drive test stands is known from the prior art. For example, this describes DE 10 2012 212 886 A1 a mobile test bed construction on a mobile pallet construction for performing an EMC measurement on a drive system test specimen having at least one first drive motor, in particular an electric motor / generator with power electronics, cabling and HV power supply.

If, in the dynamic case, the test object is driven or braked by means of the test stand, under certain circumstances an accident scenario can occur in which a test object is working against the test bench or exceeding a maximum speed permissible for the test bench, which results in great mechanical or thermal damage can cause. This can, in particular in such dynamic measurements, ie in measurements in which at least a portion of a test drive component in motion, especially in rotation, is offset, in turn lead to critical hazardous situations, for example, if a very fast rotating component of a solves such test rig assembly.

It is therefore an object of the present invention to provide a network imager assembly, a test rig assembly, and a method which make it possible to provide more security in EMC measurements on a device under test.

This object is achieved by a network replica arrangement, a test rig arrangement and a method having the features according to the respective independent claims. Advantageous embodiments of the invention are the subject of the dependent claims and the description.

A network replication arrangement according to the invention has a network replica for simulating a motor vehicle electrical system and for measuring a test object which can be coupled to the network replica arrangement for electromagnetic compatibility. Furthermore, the network replica arrangement has a first source input for coupling to a first electrical potential of a power source and an output for coupling to the test object, wherein the network replica arrangement comprises an at least partially electromagnetically shielding housing in which the network replica is arranged. In addition, the network replica arrangement has a separator arranged in the housing, which is designed to separate at least the first source input from the output.

By means of the separating device, it can advantageously be accomplished that, in critical operating situations, the test object is disconnected from the energy supply, ie energy source, whereby advantageously an automatic emergency shutdown can be provided. However, the particularly great advantage of the network replication arrangement according to the invention is that the separation device is accommodated in the at least partially electromagnetically shielding housing of the network replica arrangement. This allows, for example, a design of the separating device as a switching device or switch, in particular contactor, without disturbing the EMC measurements on the test specimen or distort the measurement results. This provided by the separator Safety mechanism can also be integrated in a particularly compact and space-efficient and cost-effective way directly the network replica arrangement.

The at least partially electromagnetically shielding housing may be formed, for example, as a metal housing, that is with or made of at least one metal or an alloy. Thus, an electromagnetic shielding effect can be implemented in a particularly simple and cost-effective manner.

In an advantageous embodiment of the invention, the separating device has at least one switch, in particular a contactor or a relay. A switch makes it possible to provide a separation of the first source input from the output of the network replica arrangement in a particularly simple manner. In addition, a switch, for example, in contrast to a fuse, a reversible and damage-free way to disconnect. Particularly advantageous, however, is the design of the switch as a relay, and especially as a contactor, because of such switches due to their high switching power and a separation of very high currents in a safe and reliable manner is possible. As a result, advantageously, the network replication arrangement can also be used for network replication of an HV on-board network and thus for measurement and test purposes of a test object to be supplied with HV voltage, such as, for example, an electric motor of an electric vehicle.

In general, it is preferable that the network replica is formed according to CISPR25. In this case, the network replica can continue to be designed as 12V network replicas, 48V network replica, HV network replica, such as 400V network replica or as network replica any other voltage levels.

In a further advantageous embodiment of the invention, the separating device is designed to separate the first source input from the network simulation. The separating device, in particular switches described above, is thus arranged on the source side in relation to the network simulation, that is, for example, directly connected downstream of the first source input. For example, a contactor or relay in the electrical line may be disposed between the first source input and the network simulator and opened to separate the first source input and the network replica. The source-side arrangement of the separator has the great advantage that thereby the output-side electrical properties of the network simulation remain unaffected in the direction of the specimen, so that in a simple way compliance with the above-described standard can be ensured, such electrical properties of the network simulation, such as a normalized Impedance, calls. Just when the separator has, for example, a relay or a contactor, a guarantee of compliance with the standard provisions with conventional contactors or relays on the DUT side could not be accomplished.

Alternatively or additionally, the at least one contactor of the separating device can be advantageously designed as an EMC-optimized contactor or switch, as this as a circuit breaker, for example in the DE 10 2012 218 411 A1 is described. Accordingly, the at least one switch of the separator may comprise a dielectric element, for example of ceramic or a polymer, to dampen an electromagnetic interaction mediated by the circuit breaker. The dielectric element is preferably part of the armature of the circuit breaker. This makes it possible in principle to arrange such a contactor or circuit breaker for separating the at least one first source input from the output on the output side in the direction of the test object, ie, between the output and the network simulation. Preferably, however, even if the separating device is formed with such an EMC-optimized contactor, this is still arranged on the source side, since so can advantageously reduce interference even further.

In a further advantageous embodiment of the invention, the network replica arrangement further has a second source input for coupling to a second different from the first electrical potential, wherein the separating device is adapted to additionally separate the second source input from the output. Via the first and second source input, the network replica arrangement can thus be coupled to two different electrical poles, for example a power supply or a battery, whereby now advantageously this education of the separation device an all-pole separation, for example in case of failure is possible. As a result, the security can be additionally increased. To interrupt the flow of current, it would be sufficient in principle to effect a separation between only one of the inputs and the output. However, in the event of excessively high currents, for example in the event of a short circuit or in the event of another fault, it may be that a contactor can not properly open, weld the contactor contacts, or the like. In this case, can be increased by the provided according to this embodiment double-executed separation mechanism, which can be implemented for example by two relays or contactors, in such a case of error, the probability that at least one of these two contactors opened and thereby the current flow can be safely interrupted.

For the separation of the second source input from the output, the same measures as for the separation of the first source input from the output come into consideration, i. Such a separation possibility can be implemented, for example, by a further switch, preferably in turn a relay or a contactor, which in turn is preferably arranged on the source side.

In a further advantageous embodiment of the invention, the network replica arrangement has a control input coupled to the separation device, via which a control signal for controlling the separation device can be received in order to separate at least the first source input, and in particular optionally also the second source input, from the output. As a result, advantageously, the separating device can be controlled externally, for example by a test stand, so that advantageously an automatic detection of fault conditions and thereby automatically initiated activation of the separating device is made possible.

Furthermore, the invention also relates to a test rig arrangement with a test stand and a network simulation arrangement according to the invention or one of its embodiments. The advantages mentioned with reference to the inventive network replica arrangement and its embodiments thus apply equally to the test bench arrangement according to the invention.

In an advantageous embodiment of the test stand arrangement, the test stand has a control device which is designed to control the separation device of the network simulator arrangement. In particular, the control device is designed to automatically control the disconnecting device of the network simulating device in the event of occurrence of at least one predetermined operating state of the test object. In this case, such a predetermined operating state of the test object represents, in particular, a critical state or an error state or the like. In this way, an automatic error detection and a separation initiated by the detection are advantageously made possible. Such automation of the separation has in particular the great advantage that the decoupling of the DUT from the power source is much faster and more reliable than, for example, a manually initiated separation or shutdown. For controlling the network replica arrangement by the control device of the test bench, the control device of the test bench can advantageously be coupled to the network replica arrangement via its control input. In addition, for the detection of such critical operating conditions advantageously already existing sensors and detection means of the test stand can be used. As a result, a particularly secure, reliable and also cost-effective safety function is implemented by the test rig arrangement.

In a further advantageous embodiment of the invention, therefore, the test rig arrangement, and in particular the test stand, at least one detection means for detecting a measurement state characterizing an operating state of the test specimen, wherein the control device is adapted to control the separating device in dependence on the detected measured variable. A separation of the source input from the output of the network replica arrangement can be initiated, for example, when a predetermined limit is exceeded or undershot by the measured value of the detected measured variable. Such a measurand may be, for example, a speed, a torque, a direction of rotation, a gradient of these quantities, in particular an acceleration, i. both a positive and a negative acceleration, etc. represent. For example, test stands are usually allowed only for operation up to a maximum speed. If such a speed is exceeded, for example, this can be detected by the control device of the test stand and, consequently, the activation of the separating device can be initiated. This applies equally to the other characteristic variables described above. However, it is also possible to define any other or further specific operating states in which the controller of the test stand is to initiate a corresponding activation of the separating device for separating the source input from the output of the network replica arrangement. For example, such a separation can be initiated even in certain fault conditions of the test bench itself, for example, in the absence of a detection means or sensor, such as a tachometer or the like.

In a further advantageous embodiment of the invention, the test rig arrangement on the DUT, wherein the DUT has at least one component of an electrified drive system of a motor vehicle. Such a component may be, for example, an electric motor, a generator, a starter generator, power electronics, etc., or any combinations thereof. Especially with dynamic EMC measurements can be achieved by the inventive network replica arrangement, as well as by the test bench arrangement according to the invention and their embodiments, a particularly high level of security.

Furthermore, the invention also relates to a method for controlling a network replica arrangement comprising a network replica for simulating a vehicle electrical system and for measuring an electromagnetic compatibility test object that can be coupled to the network replica device, wherein the network replica device has a first source input for coupling to a first electrical potential of an energy source an output for coupling to the device under test, and wherein the network simulating device comprises an at least partially electromagnetically shielding housing in which the network replica is arranged. In addition, the network replica arrangement has a separating device arranged in the housing, which is automatically controlled in the event of a specific operating state of the device under test, whereby at least the first source input is separated from the output.

Also by the method according to the invention can advantageously be an automatic and thus fast and reliable emergency shutdown in case of failure allow without having to take negative effects on the measurements in purchasing.

In addition, the advantages mentioned with reference to the network replica arrangement according to the invention and the test stand arrangement according to the invention and their embodiments apply in the same way to the method according to the invention. In addition, the subject features mentioned in connection with the network replication arrangement according to the invention and the test stand arrangement according to the invention and its embodiments make it possible to further develop the method according to the invention by further method steps.

By means of the invention and its embodiments, it is thus advantageously made possible to automatically and quickly release the test object in the event of an accident. As a result, it is advantageously possible to efficiently avoid mechanical and thermal damage and the resulting dangerous situations and, in addition, to efficiently prevent a negative influence on the EMC measurements.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures can be used not only in the respectively indicated combination but also in other combinations or in isolation.

• 1 in schematischer Darstellung eine Netznachbildungsanordnung mit integrierter Trenneinrichtung gemäß einem Ausführungsbeispiel der Erfindung; und
• 2 in schematischer Darstellung eine Prüfstandsanordnung mit einer Netznachbildungsanordnung gemäß einem Ausführungsbeispiel der Erfindung.

The invention will now be explained in more detail with reference to a preferred embodiment and with reference to the drawings. Show it:

• 1 a schematic representation of a network replica arrangement with integrated separator according to an embodiment of the invention; and
• 2 a schematic representation of a test rig arrangement with a network replica arrangement according to an embodiment of the invention.

1 shows a schematic representation of a network replica arrangement 1 with a network replica 2 and an integrated separator 3 according to an embodiment of the invention. The network simulation serves to simulate a motor vehicle electrical system for measuring one with the network replica arrangement 1 Coupling test pieces 4 (see. 2 ) on electromagnetic compatibility.

By doing that the network replica 2 simulates the vehicle electrical system or its electrical properties, the network replica serves 2 thus as a defined line conclusion for the examinee 4 at which appropriate EMC measurements are to be carried out. On the other hand, the network replica serves 2 or the network replication arrangement 1 also as a measuring tap for measuring conducted disturbances, for what purpose the network replication arrangement 1 a corresponding with the network simulation 2 coupled measuring signal connection 5 having.

The network replica arrangement 1 also has a shielding metal housing 6 in which the network replica 2 is arranged. The measuring signal connection 5 is then corresponding to the metal housing 6 arranged. In addition, the network replication arrangement assigns 1 even more connection devices, namely for coupling to a power source 7 (see. 2 ) as well as with the examinee 4 , For coupling to the energy source 7 is in particular a first source input 8th and a second source input 9 provided with the respective different electrical potentials providing poles of the energy source 7 , such as a power supply or a battery, for example, a HV battery can be coupled. Furthermore, the network replication arrangement 1 also an exit 10 in the form of two output connections 11 and 12 on which im with the energy source 7 coupled state of the network replica arrangement 1 a voltage to supply power to the device under test 4 can be tapped.

In the shielded housing 6 is now advantageously the separator 3 , this one exemplary in the form of two shooters 13 . 14 is executed, arranged. By the arrangement of these shooters 13 . 14 in the case 6 the risk of possible falsification of the measurement results of the EMC measurements to be carried out on the device under test is significantly reduced. In addition, the respective shooter 13 . 14 are in particular arranged on the source side, ie between a respective source input 8th . 9 and the network replica 2 , As a result, it can advantageously be accomplished that the output-side electrical properties of the network simulation 2 from the presence of the separator 3 remain unaffected.

For controlling the contactors 13 . 14 has the network replication arrangement 1 furthermore a control input 15 in the form of a contactor control terminal, via which a control signal for controlling the separating device 3 is receivable. It is particularly advantageous if the separator 3 by means of a control device 16 (see 2 ) of a test bench 17 (see 2 ) is controlled, since so a completely automated shutdown by decoupling the power source 7 by means of the separating device 3 , in this example, by opening the contactors 13 . 14 , in critical operating conditions of the test object 5 or the test bench 17 can be provided.

2 shows a schematic representation of a test rig arrangement 18 with a network replication arrangement 1 according to an embodiment of the invention. The network replica arrangement 1 can like it too 1 be described described. The test rig arrangement 18 now has a test bench 17 , a candidate 4 and an energy source 7 on. The energy source 7 is formed in this example as HV-DC source and with its HV positive potential with the first source input 8th and with its HV negative potential with the second source input 9 the network replication arrangement 1 connected. The examinee 4 is corresponding to the output 10 via the respective output connections 11 . 12 the network replication arrangement 1 connected. In this example, the device under test comprises an electric motor 19 and a corresponding inverter 20 ie inverters. In order to measure conducted interference in the context of EMC measurements, a corresponding measuring receiver can continue to be used 21 with the through the network replica arrangement 1 provided Meßabgriff be connected, in particular via a corresponding measurement signal terminal 5 the network replication arrangement 1 , As described, the network replica arrangement 1 On the other hand, radiated measurements with antennas can also be performed as a defined line termination for the electrified drive system to be tested.

Furthermore, the test bench 17 a drive motor 22 on that with the electric motor 19 coupled to the test specimen, and this example, accelerate or decelerate. In addition, the test bench 17 also detection means 23 , For example, corresponding sensors, by means of which during operation, the torque, the speed and / or further engine parameters are detected continuously. Based on this through the detection means 23 detected characteristic measured variables can by the test bench control, that is, the control device 16 , the test bench 17 critical operating conditions are detected. The test bench control 16 is still via a control line 24 and via the control input 15 the network replication arrangement 1 with the separator 3 coupled and controls the separator 3 upon detection of such a critical operating condition corresponding to the contactors 13 . 14 to open and thereby a decoupling of the energy source 7 effect, whereby advantageously a particularly safe, fast and automatic emergency shutdown is provided. For example, such emergency shutdown by the test bench control 16 be initiated if one by the detection means 23 detected speed exceeds a maximum permissible maximum speed value. In general, for any, by means of the detection means 23 detectable, motor parameters limit values are set, if they exceed or fall below by the test bench control 16 a corresponding emergency shutdown is initiated.

If now in the dynamic case by means of the test bench 17 is driven or braked by the network replica arrangement 1 with integrated emergency shutdown now advantageously the possibility of the DUT 4 in the event of an accident, in particular before the occurrence of such an accident, in time automatically unlock. As a result, mechanical or thermal damage can advantageously be prevented.

Through by the two shooters 13 . 14 provided all-pole separation, the emergency shutdown is also double-fused, thus ensuring even more security. In general, however, it is already the provision of only one contactor 13 . 14 sufficient to supply the power of the test object 4 to interrupt.

Overall, as a result of the invention and its embodiments advantageously a significant improvement in the safety of a test bench can be provided. Above all, however, by the fact that the shutdown device provided by the separating device is integrated in the screened area of the network simulation, this security mechanism can be used without adulteration of the Measurement results of the EMC measurements are provided.

LIST OF REFERENCE NUMBERS

1

Artificial network arrangement

2

Artificial network

3

separator

4

examinee

5

Measuring signal terminal

6

metal housing

7

energy

8th

first source input

9

second source input

10

output

11

output port

12

output port

13

contactor

14

contactor

15

control input

16

control device

17

test bench

18

test arrangement

19

electric motor

20

inverter

21

measuring receivers

22

drive motor

23

detection means

24

control line

QUOTES INCLUDE IN THE DESCRIPTION

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

Cited patent literature

• DE 102012212886 A1 [0004]
• DE 102012218411 A1 [0014]

Claims (10)

A network replication arrangement (1) with a network simulation (2) for simulating a motor vehicle electrical system and for measuring a test object (4) which can be coupled to the network replication arrangement (1) for electromagnetic compatibility, the network replication arrangement (1) having a first source input (8, 9) for coupling to a first electrical potential of a power source (7) and an output (10) for coupling to the device under test (4), and wherein the network simulating device (1) comprises an at least partially electromagnetically shielding housing (6) in which the network replica (2 ), characterized in that the network replica arrangement (1) has a separating device (3) arranged in the housing (6), which is designed to separate at least the first source input (8, 9) from the output (10). Network replica arrangement (1) according to Claim 1 , characterized in that the separating device (3) has at least one switch (13, 14), in particular a contactor (13, 14) or a relay. Network replica arrangement (1) according to one of the preceding claims, characterized in that the separating device (3) is designed to separate the first source input (8, 9) from the network replica (2). Network replica arrangement (1) according to one of the preceding claims, characterized in that the network replica (2) has a second source input (9, 8) for coupling to a second electrical potential different from the first one, wherein the isolating device (3) is designed to control the second source input (9, 8) to be separated from the output (10). A network simulating arrangement (1) according to one of the preceding claims, characterized in that the network simulating arrangement (1) has a control input (15) coupled to the separating device (3), via which a control signal for controlling the separating device (3) can be received to at least the first source input (8, 9) to be separated from the output (10). Test rig arrangement (18) with a test stand (17) and a network simulation arrangement (1) according to one of the preceding claims. Test rig arrangement (18) according to Claim 6 , characterized in that the test stand (17) has a control device (16) which is designed to control the separating device (3) of the network simulating device (1) automatically in the event of occurrence of at least one predetermined operating state of the test object (4). Test rig arrangement (18) according to Claim 6 or 7 , characterized in that the test rig arrangement (18) has at least one detection means (23) for detecting a measured variable characterizing an operating state of the test object (4), wherein the control device (16) is designed to operate the separating device (3) in dependence on the detected one To control the measured variable. Test rig arrangement (18) according to one of Claims 6 to 8th , characterized in that the test rig arrangement (18) has the test object (4), wherein the test object (4) has at least one component (19, 20) of an electrified drive system of a motor vehicle. Method for controlling a network replication arrangement (1) which has a network replica (2) for simulating a motor vehicle electrical system and for measuring an electromagnetic compatibility test object (4) which can be coupled to the network replica arrangement (1), wherein the network replica arrangement (1) has a first source input (8 9) for coupling to a first electrical potential of a power source (7) and an output (10) for coupling to the device under test (4), and wherein the network simulating device (1) comprises an at least partially electromagnetically shielding housing (6), in which the imitation network (2) is arranged, characterized in that the network imitation arrangement (1) has a housing (6) arranged separating device (3) which is automatically controlled in the event of occurrence of a certain operating state of the test piece (4), whereby at least the first source input (8, 9) is separated from the output (10).

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