Electromagnetic eddy current brake for a vehicle equipped with a first electrical system and a second electrical system

Abstract

The present invention relates to an electromagnetic eddy current brake (10) for a vehicle equipped with a first on-board electrical system (12a) and a second on-board electrical system (12b), comprising at least one first coil (14a), each of which is or can be electrically connected to the first on-board electrical system (12a) of the vehicle in such a way that a first magnetic field can be created by means of a first current signal output by the first on-board electrical system (12a) and conducted through the at least one first coil (14a), wherein the electromagnetic eddy current brake (10) additionally comprises at least one second coil (14b), each of which is or can be electrically connected to the second on-board electrical system (12b) of the vehicle in such a way that a second magnetic field can be created by means of a second current signal output by the second on-board electrical system (12b) and conducted through the at least one second coil (14b).The invention also relates to a method for mounting an electromagnetic eddy current brake (10) on and / or in a vehicle and a method for operating an electromagnetic eddy current brake (10) of a vehicle.

Description

[0001] The present invention relates to an electromagnetic eddy current brake for a vehicle equipped with a first electrical system and a second electrical system. The invention also relates to a method for mounting an electromagnetic eddy current brake on and / or in a vehicle equipped with a first electrical system and a second electrical system. Furthermore, the invention relates to a method for operating an electromagnetic eddy current brake of a vehicle equipped with a first electrical system and a second electrical system. State of the art

[0002] Eddy current brakes are known from the prior art, such as DE 10 2021 214 867 A1, by means of which a vehicle equipped with such an eddy current brake can be braked. Disclosure of the invention

[0003] The present invention provides an electromagnetic eddy current brake for a vehicle equipped with a first on-board power supply and a second on-board power supply, having the features of claim 1, a method for mounting an electromagnetic eddy current brake on and / or in a vehicle equipped with a first on-board power supply and a second on-board power supply, having the features of claim 9, and a method for operating an electromagnetic eddy current brake of a vehicle equipped with a first on-board power supply and a second on-board power supply, having the features of claim 10. Advantages of the invention

[0004] The present invention creates advantageous topologies or options for alternatively or additionally supplying power to an eddy current brake of a vehicle / motor vehicle from both existing on-board electrical systems of the respective vehicle / motor vehicle. In particular, the present invention implements topologies or options for selectively supplying power to the eddy current brake from the two existing on-board electrical systems of the vehicle / motor vehicle equipped therewith. The option of selectively supplying power to the eddy current brake from the two existing on-board electrical systems realized by means of the present invention results in greater availability of the eddy current brake. Above all, in the event of a failure of one of the two existing on-board electrical systems, the eddy current brake can still be reliably used to brake the vehicle / motor vehicle by means of a power supply to the eddy current brake from the other of the two on-board electrical systems.Even in the event of a short circuit in one of the two electrical systems of the vehicle / motor vehicle, the vehicle / motor vehicle equipped with the eddy current brake can still be brought to a standstill by means of the eddy current brake. The present invention thus contributes significantly to improving driving comfort for the driver of the vehicle / motor vehicle and to increasing the safety standards of the vehicle / motor vehicle.

[0005] It should be noted that the usability of the present invention is not limited to any specific vehicle type / motor vehicle. Instead, the present invention can be implemented in (almost) any vehicle / motor vehicle equipped with a first on-board electrical system and a second on-board electrical system. The present invention is therefore primarily applicable to a passenger car (PV), such as an electric or hybrid vehicle. However, its applicability is not limited thereto.

[0006] In an advantageous embodiment of the electromagnetic eddy current brake, the at least one first coil is arranged in a first bridge branch of a first H-circuit and / or the at least one second coil is arranged in a second bridge branch of a second H-circuit. As will become clear from the following description, the first H-circuit and / or the second H-circuit are advantageously suitable for controlling an alternative power supply of the at least one first coil or the at least one second coil from the respective first or second network.

[0007] For example, each of the two half-bridges of the first H-circuit can comprise a transistor with a diode arranged in parallel with the transistor and a further diode, and / or each of the two half-bridges of the second H-circuit can comprise a transistor with a diode arranged in parallel with the transistor and a further diode. The first H-circuit and the second H-circuit can therefore be implemented relatively cost-effectively.

[0008] In a further advantageous embodiment, each of the two half-bridges of the first H-circuit comprises two transistors, each with a diode arranged in parallel with the respective transistor. Accordingly, each of the two half-bridges of the second H-circuit can also comprise two transistors, each with a diode arranged in parallel with the respective transistor. This allows for a full FET design for both the first H-circuit and the second H-circuit.

[0009] Preferably, the first bridge branch of the first H-circuit comprises a first diode and / or the second bridge branch of the second H-circuit comprises a second diode. In this way, the embodiment of the eddy current brake described here implements an electrical circuit by means of which the effects of a magnetic coupling of its coils can be reduced.

[0010] As an advantageous development, the first bridge branch of the first H-circuit can additionally comprise a first transistor with a third diode arranged in parallel with the first transistor, and / or the second bridge branch of the second H-circuit can additionally comprise a second transistor with a fourth diode arranged in parallel with the second transistor. In the embodiment of the eddy current brake described here, the effects of the magnetic coupling of its coils can be effectively suppressed.

[0011] In a further advantageous embodiment of the electromagnetic eddy-current brake, the first bridge branch of the first H-circuit comprises a first thyristor and / or the second bridge branch of the second H-circuit comprises a second thyristor. The embodiment of the eddy-current brake described here also ensures effective suppression of the effects of the magnetic coupling of its coils during operation.

[0012] Preferably, the eddy current brake comprises a first capacitor arranged in parallel with the first H-circuit and / or a second capacitor arranged in parallel with the second H-circuit. In this case, the first capacitor and / or the second capacitor can be used as "storage capacitors."

[0013] Carrying out a corresponding method for mounting an electromagnetic eddy current brake on and / or in a vehicle equipped with a first electrical system and a second electrical system also achieves the advantages described above. The method for mounting an electromagnetic eddy current brake can be further developed according to the embodiments of the eddy current brake explained above.

[0014] Furthermore, implementing a corresponding method for operating an electromagnetic eddy-current brake of a vehicle equipped with a first electrical system and a second electrical system also provides the advantages explained above. It is expressly noted that the method for operating an electromagnetic eddy-current brake can also be further developed according to the embodiments of the eddy-current brake explained above. Short description of the drawings

[0015] Further features and advantages of the present invention are explained below with reference to the figures. They show: Fig. 1 is a schematic representation of a first embodiment of the electromagnetic eddy current brake; Fig. 2 shows a circuit diagram of a second embodiment of the eddy current brake; Fig. 3a to 3e show a circuit diagram and coordinate systems for explaining a third embodiment of the electromagnetic eddy current brake; Fig. 4a to 4e show a circuit diagram and coordinate systems for explaining a fourth embodiment of the electromagnetic eddy current brake; Fig. 5 is a circuit diagram of a fifth embodiment of the electromagnetic eddy current brake; Fig. 6 is a circuit diagram of a sixth embodiment of the electromagnetic eddy current brake; Fig. 7 is a flowchart for explaining an embodiment of the method for mounting an electromagnetic eddy current brake on and / or in a vehicle equipped with a first on-board power supply and a second on-board power supply; and Fig. 8 is a flowchart for explaining an embodiment of the method for operating an electromagnetic eddy current brake of a vehicle equipped with a first on-board electrical system and a second on-board electrical system. Embodiments of the invention

[0016] Fig. 1 shows a schematic representation of a first embodiment of the electromagnetic eddy current brake.

[0017] By means of the Fig. 1 schematically shown eddy current brake 10, a vehicle / motor vehicle (not shown) which is provided with a first on-board network 12a with a first on-board network voltage U 12a and a second vehicle electrical system 12b with a second vehicle electrical system voltage U 12bis equipped, can be braked. The eddy current brake 10 has at least one first coil / winding 14a, which can be or is connected electrically to the first vehicle electrical system 12a in such a way that a first magnetic field can be / is created by means of a first current signal output by the first vehicle electrical system 12a and conducted through the at least one first coil 14a. In addition to the at least one first coil 14a, the eddy current brake 10 also has at least one second coil / winding 14b. The at least one second coil 14b can be or is connected electrically to the second vehicle electrical system 12b in such a way that a second magnetic field can be / is created by means of a second current signal output by the second vehicle electrical system 12b and conducted through the at least one second coil 14b.A braking force can be exerted on a brake disc / reaction disc of the eddy current brake 10 (not shown) mounted on a shaft of the vehicle / motor vehicle, either by means of the first magnetic field or by means of the second magnetic field. This braking force can be mechanically transmitted to at least one wheel of the vehicle / motor vehicle that is mechanically connected to the shaft. For this purpose, the coils 14a and 14b can be arranged adjacent to the brake disc / reaction disc. The shaft can be understood, in particular, as an electric motor shaft, an intermediate shaft, or a drive shaft.

[0018] As can be seen from the Fig. 1, the eddy current brake 10 has a topology that enables an alternative power supply to at least one of its coils 14a and 14b from the two existing electrical systems 12a and 12b of the vehicle / motor vehicle. The connectability / connection of the at least one first coil 14a to the first electrical system 12a can be understood to mean that the first current signal output by the first electrical system 12a is transferable / is transferred by the at least one first coil 14a, while a "forwarding" of the first current signal by the at least one second coil 14b is prevented.Accordingly, the connectability / connection of the at least one second coil 14b to the second vehicle electrical system 12b is preferably understood to mean that the second current signal output by the second vehicle electrical system 12b is transferable / is transferred by the at least one second coil 14b, but a "forwarding" of the second current signal by the at least one first coil 14a is prevented.

[0019] Therefore, even in the event of a failure or short circuit of one of the two on-board electrical systems 12a and 12b, the eddy-current brake 10 can still be operated using a power supply from the other of the two on-board electrical systems 12a and 12b in such a way that the vehicle / motor vehicle equipped with it can be reliably braked, in particular brought to a standstill. The eddy-current brake 10 described here therefore advantageously has a high level of redundancy. Despite the possibility of alternative power supply to the eddy-current brake 10, optionally from the first on-board electrical system 12a or from the second on-board electrical system 12b, there is a galvanic isolation between the first on-board electrical system 12a and the second on-board electrical system 12b. This continues to ensure reliable insulation protection to prevent electric shock.

[0020] The at least one first coil 14a and the at least one second coil 14b can be integrated into different circuits, such as series circuits or parallel circuits, and / or have different numbers of turns. In this way, it can be ensured that even if the first vehicle electrical system voltage U 12a of the first vehicle electrical system 12a from the second vehicle electrical system voltage U 12b of the second on-board network 12b, the vehicle / motor vehicle can nevertheless be braked optionally by energizing the at least one first coil 14a from the first on-board network 12a or by energizing the at least one second coil 14b from the second on-board network 12b.

[0021] Merely as examples, Fig. 1 only shows exactly one first coil / winding 14a and exactly one second coil / winding 14b, which are in particular both arranged on an iron core 16 of a pole of an iron yoke 18. However, it should be noted that the eddy current brake 10 can also have a plurality of first coils 14a and / or a plurality of second coils 14b. In particular, a first coil 14a and a second coil 14b can be arranged on each pole. Alternatively, however, each pole can also be equipped with only one first coil 14a or one second coil 14b. However, the design of the eddy current brake 10 described here is not limited to a specific total number of first and second coils 14a and 14b or to a specific placement of the first and second coils 14a and 14b. The first electrical system 12a and the second electrical system 12b can in particular be an LV electrical system and an HV electrical system of the vehicle / motor vehicle.However, the usability of the eddy current brake 10 described here is not limited to specific vehicle electrical system types.

[0022] As in Fig. 1, the at least one first coil 14a is electrically integrated into a first electronic device 20a such that a power supply of the at least one first coil 14a from the first vehicle electrical system 12a can be controlled / switched by means of the first electronic device 20a. Accordingly, the at least one second coil 14b is also electrically integrated into a second electronic device 20b such that the power supply of the at least one second coil 14b from the second vehicle electrical system 12b can be controlled / switched by means of the second electronic device 20b. Although this is Fig. 1, the power supply of a plurality of first coils 14a from the first on-board network 12a can be controlled / switched by means of the compact first electronic device 20a and / or the power supply of a plurality of second coils 14b from the second on-board network 12b can be controlled / switched by means of the compact second electronic device 20b. Preferably, the first electronic device 20a has a (not sketched) connection part / adapter part for electrically connecting the at least one first coil 14a to the first network 12a and / or the second electronic device 20b has a (not shown) connection part / adapter part for electrically connecting the at least one second coil 14b to the second network 12b. Possible examples of the first electronic device 20a and the second electronic device 20b are explained below.

[0023] Fig. 2 shows a circuit diagram of a second embodiment of the eddy current brake.

[0024] The circuit diagram of the Fig. The eddy current brake 10 illustrated in Figure 2 has a first electronic device 20a with a first H-circuit 22a, wherein the at least one first coil 14a is arranged together with a first resistor Ra in a first bridge leg of the first H-circuit 22a. The first H-circuit 22a comprises two half-bridges (bridge legs) which are connected via the first bridge leg. Each of the two half-bridges of the first H-circuit 22a is formed with a transistor T1a or T2a with a diode D1a or D2a arranged in parallel with the transistor T1a or T2a and with a further diode D3a or D4a. The first electronic device 20a preferably also has a first capacitor Ca arranged in parallel with the first H-circuit 22a.

[0025] Accordingly, the design of the Fig. 2, the at least one second coil 14b is also arranged together with a second resistor Rb in a second bridge leg of a second H-circuit 22b of the second electronic device 20b. The second H-circuit 22b has two half-bridges (bridge legs) connected via the second bridge leg. By way of example, each of the two half-bridges of the second H-circuit 22b also comprises a transistor T1b or T2b with a diode D1b or D2b arranged in parallel with the transistor T1b or T2b and a further diode D3b or D4b. In addition, a second capacitor Cb of the second electronic device 20b can also be arranged in parallel with the second H-circuit 22b.

[0026] The H-circuits 22a or 22b can also be referred to as half-controlled full bridges or H-bridges. The respective H-circuit 22a or 22b can each be used to control a supply current from the electrically connected vehicle electrical system 12a or 12b through the at least one integrated coil 14a or 14b. For example, if the respective transistors T1a and T2a or T1b and T2b of the respective H-circuit 22a or 22b are switched on, the at least one integrated coil 14a or 14b can be supplied with current from the associated vehicle electrical system 12a or 12b, which can be referred to as the so-called "feed" operating state of the respective electronic device 20a or 20b.The respective power supply of the at least one integrated coil 14a or 14b from the associated vehicle electrical system 12a or 12b can be interrupted by switching off the other of the two transistors T1a and T2a or T1b and T2b of the respective H-circuit 22a or 22b while exactly one of the transistors T1a and T2a or T1b and T2b of the respective H-circuit 22a or 22b remains switched on. If the transistor T1a or T1b of the respective H-circuit 22a or 22b is switched on and the transistor T2a or T2b of the respective H-circuit 22a or 22b is switched off, one can speak of a so-called "freewheel 1" operating state of the respective electronic device 20a or 20b. Accordingly, if the transistor T1a or T1b of the respective H-circuit 22a or 22b is switched off and the transistor T2a or T2b of the respective H-circuit 22a or 22b is switched on, this can be described as a so-called operating state “freewheel 2” of the respective electronic device 20a or 20b.A rapid reduction of a current flowing through the at least one integrated coil 14a or 14b into the electrically connected vehicle electrical system 12a or 12b is possible by switching off both transistors T1a and T2a or T1b and T2b of the respective H-circuit 22a or 22b, which can be described as the so-called “feedback” operating state of the respective electronic device 20a or 20b.

[0027] However, with the eddy current brake 10 the Fig. 2, a magnetic coupling of its coils 14a and 14b with a transformation ratio ε not equal to zero (as a so-called transformer) is also present. This is explained below using two operating states of the first electronic device 20a: When the first electronic device 20a is in the "feed" operating state, a first voltage U is present at the at least one first coil 14a. 14a equal to the first vehicle electrical system voltage U 12aof the first on-board network 12 and the first current signal flows with a first current intensity I 14a not equal to zero through the at least one first coil 14a. However, when the first electronic device 20a is in the "feeding" operating state, a second voltage U is present at the at least one second coil 14b despite the switched-off transistors T1b and T2b of the second electronic device 20b (due to the magnetic coupling). 14b equal to a product of the first voltage U 14a (ie the first vehicle electrical system voltage U 12a ) with the transformation ratio ε, which is why the second current signal with a second current intensity I 14b flows non-zero.

[0028] If the first electronic device 20a is in the “feedback” operating state, the first voltage U applied to the at least one first coil 14a is 14aequal to the negative of the first vehicle electrical system voltage U 12a of the first vehicle electrical system and through the at least one first coil 14a flows the first current signal with the first current intensity I 14a not equal to zero. However, when the first electronic device 20a is in the "feedback" operating state, the second voltage U is present at the at least one second coil 14b despite the switched-off transistors T1b and T2b of the second electronic device 20b (due to the magnetic coupling). 14b equal to the product of the first voltage U 14a (ie the negative of the first vehicle electrical system voltage U 12a ) with the transformation ratio ε, so that the second current signal with the second current intensity I 14b flows non-zero.

[0029] This can also be described as a transformer transfer of the first voltage U 14aof the at least one first coil 14a to the at least one second coil 14b while the first electronic device 20a is in the "feed" or "feedback" operating state. A corresponding transformer transmission of the second voltage U 14b of the at least one second coil 14b to the at least one first coil 14a also occurs when the second electronic device 20b is in the operating state “feeding” or “feeding back”.

[0030] Regarding further properties and features of the eddy current brake 10 of the Fig. 2 and its advantages, please refer to the description of the embodiment of the Fig. 1.

[0031] Fig. 3a to 3e show a circuit diagram and coordinate systems for explaining a third embodiment of the electromagnetic eddy current brake.

[0032] As a supplement to the design of the Fig. 2 shows the circuit diagram of the Fig. 3a further comprises a diode D5a in the first bridge branch of the first H-circuit 22a and a diode D5b in the second bridge branch of the second H-circuit 22b.

[0033] In the coordinate systems of the Fig. 3b to 3e the abscissa is a time axis t, while the ordinates of the coordinate systems represent the Fig. 3b to 3e the first voltage U applied to the at least one first coil 14a 14a , the first current I flowing through the at least one first coil 14a 14a , the second voltage U applied to the at least one second coil 14b 14b and the second current I flowing through the at least one second coil 14b 14b are reproduced.

[0034] During a time interval Δ1a, the first electronic device 20a is alternately switched to the operating state “feed” and to either the operating state “freewheel 1” or the operating state “freewheel 2”, while the transistors T1b and T2b of the second electronic device 20b remain switched off. As can be seen from the coordinate system of the Fig. However, as can be seen in Figure 3e, during the time interval Δ1a, a current flow through the at least one second coil 14b is prevented by means of the diode D5b. In a subsequent time interval Δ2a, the first electronic device 20a is in its "feedback" operating state (with transistors T1b and T2b of the second electronic device 20b switched off).

[0035] Thereafter, the second electronic device 20b is alternately switched to the operating state “feed” and to either the operating state “freewheel 1” or the operating state “freewheel 2” during a time interval Δ1b, while the transistors T1a and T2a of the first electronic device 20a remain switched off. Based on the coordinate system of the Fig. 3c shows that, by means of the diode D5a, undesired current flow through the at least one first coil 14a is reliably prevented during the time interval Δ1b. During a time interval Δ2b, the second electronic device 20b is in its "feedback" operating state (with transistors T1a and T2a of the first electronic device 20a switched off).

[0036] Regarding further properties and features of the eddy current brake 10 of the Fig. 3 and its advantages, reference is made to the description of the embodiments of the Fig. 1 and Fig. 2.

[0037] Fig. 4a to 4e show a circuit diagram and coordinate systems for explaining a fourth embodiment of the electromagnetic eddy current brake.

[0038] As a further development of the design of the Fig. 3a to 3e are the eddy current brake 10 of the Fig. 4a to 4e, a transistor T3a with a diode D6a arranged in parallel with the transistor T3a is additionally integrated into the first bridge branch of the first H-circuit 22a and a transistor T3b with a diode D6b arranged in parallel with the transistor T3b is additionally integrated into the second bridge branch of the second H-circuit 22b.

[0039] In the coordinate systems of the Fig. 4b to 4e, the abscissa is a time axis t, while the ordinates of the coordinate systems represent the Fig. 4b to 4e, the first voltage U applied to the at least one first coil 14a 14a, the first current I flowing through the at least one first coil 14a 14a , the second voltage U applied to the at least one second coil 14b 14b and the second current I flowing through the at least one second coil 14b 14b are reproduced.

[0040] During the time interval Δ1a, the first electronic device 20a is alternately switched to the "feed" operating state and to either the "freewheel 1" or the "freewheel 2" operating state, while the transistors T1b and T2b of the second electronic device 20b remain switched off. Thereafter, the first electronic device 20a is in its "feedback" operating state (with transistors T1b and T2b of the second electronic device 20b switched off) during the time interval Δ2a. However, by switching off the transistor T3b, an undesired current flow through the at least one second coil 14b can be reliably prevented during the time interval Δ2a.

[0041] Subsequently, during the time interval Δ1b, the second electronic device 20b is alternately switched to the "feed" operating state and to either the "freewheeling 1" or the "freewheeling 2" operating state, while the transistors T1a and T2a of the first electronic device 20a remain switched off. Within the time interval Δ2b, the second electronic device 20b is in its "feedback" operating state (with transistors T1a and T2a of the first electronic device 20a switched off). The switched-off transistor T3a can also ensure that no current flows through the at least one first coil 14a during the time interval Δ2b.

[0042] As can be seen from the coordinate systems of Fig. As can be seen in Figures 4b to 4e, complete decoupling of coils 14a and 14b is achieved by equipping the respective bridge branch with transistor T3a or T3b. By equipping the bridge branches with transistors T3a and T3b, the problem of magnetic coupling is thus completely eliminated. Preferably, transistors T3a and T3b are only switched off when the current flow through at least one associated coil 14a or 14b has completely subsided, in order to avoid defects caused by overvoltages.

[0043] Regarding further properties and features of the eddy current brake 10 of the Fig. 4 and its advantages, reference is made to the description of the embodiments of the Fig. 1 to 3.

[0044] Fig. 5 shows a circuit diagram of a fifth embodiment of the electromagnetic eddy current brake.

[0045] As a supplement to the design of the Fig. 2 shows the circuit diagram of the Fig. The eddy current brake 10 shown in Figure 5 also has a first thyristor Th1 in the first bridge branch of the first H-circuit 22a and a second thyristor Th2 in the second bridge branch of the second H-circuit 22b. The first thyristor Th1 can also be used to prevent an undesired current flow through the at least one first coil 14a when the second electronic device 20b is in its "feeding", "freewheeling 1", "freewheeling 2", or "feeding back" operating states with transistors T1a and T2a of the first electronic device 20a switched off. Accordingly, the second thyristor Th2 can be used to ensure that no undesired current flow through the at least one second coil 14b occurs when the first electronic device 20a is in its "feeding", "freewheeling 1", "freewheeling 2", or "feeding back" operating states with transistors T1b and T2b of the second electronic device 20b switched off.With the eddy current brake 10 of the . Fig. 5, the same values ​​for the voltages U 14a and U 14b and for the currents I 14a and I l4b as they are defined by means of the coordinate systems of the Fig. 4b to 4e are reproduced.

[0046] Regarding further properties and features of the eddy current brake 10 of the Fig. 5 and its advantages, reference is made to the description of the embodiments of the Fig. 1 to 4.

[0047] Fig. 6 shows a circuit diagram of a sixth embodiment of the electromagnetic eddy current brake.

[0048] Both using the circuit diagram of the Fig. In the eddy current brake 10 schematically shown in Figure 6, the diode 5a and the transistor T3a with the diode D6a arranged in parallel with the transistor T3a are integrated into the first bridge branch of the first H-circuit 22a, and two transistors T3b-1 and T3b-2, each with a diode D6b-1 or D6b-2 arranged in parallel with the transistor T3b-1 or T3b-2, are integrated into the second bridge branch of the second H-circuit 22b. In addition, each of the two half-bridges of the second H-circuit 22b comprises two transistors T4 and T5 or T6 and T7, each with a diode D7 and D8 or D9 and D10 arranged in parallel with the respective transistor T4 and T5 or T6 and T7. In this case, the second H-circuit 22b can also be referred to as a full-FET version.

[0049] The two transistors T3b-1 and T3b-2 integrated into the second bridge branch of the second H-circuit 22b, each with a diode D6b-1 or D6b-2 arranged in parallel, can ensure that no undesired current flow through the at least one second coil 14b occurs when the first electronic device 20a is in its operating states "feed", "freewheel 1", "freewheel 2" or "feedback" with transistors T4b, T5b, T6b or T7b of the second electronic device 20b switched off. Also in the embodiment of the Fig. 6 Therefore, during the time intervals Δ1a, Δ2a, Δ1b and Δ2b defined above, the coordinate systems of the Fig. 4b to 4e shown values ​​for the voltages U 14a and U 14b and for the currents I l4a and I l4b The Fig. The schematically illustrated design of the second bridge branch of the second H-circuit 22b in Figure 6 is particularly advantageous for a second on-board network 12b in which comparatively high currents occur and, therefore, bipolar components such as diodes or thyristors would generate high conduction losses.

[0050] Regarding further properties and features of the eddy current brake 10 of the Fig. 6 and its advantages, reference is made to the description of the embodiments of the Fig. 1 to 5.

[0051] It should be noted again that all of the eddy current brakes 10 described above can still be used reliably and fully to brake the vehicle / motor vehicle equipped with them, even in the event of a short circuit in one of the on-board electrical systems 12a or 12b, using a power supply from the other on-board electrical system 12a or 12b. Simultaneous powering of the respective eddy current brake 10 from both on-board electrical systems 12a and 12b is also possible. The circuits of the eddy current brakes 10 described above can also be used to exchange energy between the on-board electrical systems 12a and 12b. However, since the "transformer" of the respective eddy current brake 10 is not designed for this purpose, comparatively high losses occur and the transferable power is limited. However, this function can be performed, particularly for emergency operation or for precharging or discharging at least one storage capacitor.In principle, other switches, such as MOSFETs or JFETs, can be used instead of IGBTs. Mixed topologies of the circuits of the eddy current brakes 10 described above are also possible.

[0052] Fig. 7 shows a flowchart for explaining an embodiment of the method for mounting an electromagnetic eddy current brake on and / or in a vehicle equipped with a first on-board network and a second on-board network.

[0053] Using the method described below, for example, the above-explained embodiments of eddy current brakes can be mounted on a vehicle / motor vehicle. However, the feasibility of the method is not limited to the installation of such an eddy current brake. Likewise, the feasibility of the method is not limited to any specific vehicle / motor vehicle type.

[0054] In a method step S1, at least one first coil of the eddy current brake is electrically connected to the first electrical system of the vehicle in such a way that a first magnetic field is created by means of a first current signal output by the first electrical system and conducted through the at least one first coil. In addition, in a method step S2, at least one second coil of the eddy current brake is electrically connected to the second electrical system of the vehicle in such a way that a second magnetic field is created by means of a second current signal output by the second electrical system and conducted through the at least one second coil. Method steps S1 and S2 can be carried out in any order, simultaneously, or with an overlapping time.

[0055] Fig.8 shows a flowchart for explaining an embodiment of the method for operating an electromagnetic eddy current brake of a vehicle equipped with a first on-board network and a second on-board network.

[0056] The method described below is well suited for operating the embodiments of eddy current brakes explained above. However, the method's applicability is not limited to the use of such an eddy current brake. Likewise, the method's applicability is not limited to any specific vehicle type / motor vehicle.

[0057] In a method step S10, a first current signal is output through the first on-board electrical system of the vehicle to at least one first coil of the eddy current brake, which is each electrically connected to the first on-board electrical system, in such a way that a first magnetic field is created by means of the first current signal conducted through the at least one first coil. In method step S11, a second current signal is output through the second on-board electrical system of the vehicle to at least one second coil of the eddy current brake, which is each electrically connected to the second on-board electrical system. The second current signal is output in such a way that a second magnetic field is created by means of the second current signal conducted through the at least one second coil. The executability of method steps S10 and S11 is not tied to any particular chronological order. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This 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

[0000] DE 10 2021 214 867 A1

[0002]

Claims

[1] Electromagnetic eddy current brake (10) for a vehicle equipped with a first on-board network (12a) and a second on-board network (12b), comprising: at least one first coil (14a), which can be or is connected electrically to the first on-board electrical system (12a) of the vehicle in such a way that a first magnetic field can be produced by means of a first current signal output by the first on-board electrical system (12a) and conducted through the at least one first coil (14a); characterized by at least one second coil (14b), which can be or is connected electrically to the second on-board network (12b) of the vehicle in such a way that a second magnetic field can be produced by means of a second current signal output by the second on-board network (12b) and conducted through the at least one second coil (14b). [2] Electromagnetic eddy current brake (10) according to claim 1, wherein the at least one first coil (14a) is arranged in a first bridge branch of a first H-circuit (22a) and / or the at least one second coil (14b) is arranged in a second bridge branch of a second H-circuit (22b). [3] Electromagnetic eddy current brake (10) according to claim 2, wherein each of the two half-bridges of the first H-circuit (22a) comprises a transistor (T1a, T2a) with a diode (D1a, D2a) arranged in parallel with the transistor (T1a, T2a) and a further diode (D3a, D4a) and / or each of the two half-bridges of the second H-circuit (22b) comprises a transistor (T1b, T2b) with a diode (D1b, D2b) arranged in parallel with the transistor (T1b, T2b) and a further diode (D3b, D4b). [4] Electromagnetic eddy current brake (10) according to claim 2, wherein each of the two half-bridges of the first H-circuit (22a) comprises two transistors each with a diode arranged in parallel with the respective transistor and / or each of the two half-bridges of the second H-circuit (22b) comprises two transistors (T4, T5, T6, T7) each with a diode (D7, D8, D9, D10) arranged in parallel with the respective transistor (T4, T5, T6, T7). [5] Electromagnetic eddy current brake (10) according to one of claims 2 to 4, wherein the first bridge branch of the first H-circuit (22a) comprises a first diode (D5a) and / or the second bridge branch of the second H-circuit (22b) comprises a second diode (D5b). [6] Electromagnetic eddy current brake (10) according to claim 5, wherein the first bridge branch of the first H-circuit (22a) additionally comprises a first transistor (T3a) with a third diode (D6a) arranged in parallel with the first transistor (T3a) and / or the second bridge branch of the second H-circuit (22b) additionally comprises a second transistor (T3b) with a fourth diode (D6b) arranged in parallel with the second transistor (T3b). [7] Electromagnetic eddy current brake (10) according to one of claims 2 to 4, wherein the first bridge branch of the first H-circuit (22a) comprises a first thyristor (Th1) and / or the second bridge branch of the second H-circuit (22b) comprises a second thyristor (Th2). [8] Electromagnetic eddy current brake (10) according to one of claims 2 to 7, wherein the eddy current brake (10) comprises a first capacitor (Ca) arranged in parallel with the first H-circuit (22a) and / or a second capacitor (Cb) arranged in parallel with the second H-circuit (22b). [9] Method for mounting an electromagnetic eddy current brake (10) on and / or in a vehicle equipped with a first on-board network (12a) and a second on-board network (12b), comprising the step: Electrically connecting at least one first coil (14a) of the eddy current brake (10) to the first electrical system (12a) of the vehicle in such a way that a first magnetic field is produced (S1) by means of a first current signal output by the first electrical system (12a) and conducted through the at least one first coil (14a); characterized by the step: Electrically connecting at least one second coil (14b) of the eddy current brake (10) to the second electrical system (12b) of the vehicle in such a way that a second magnetic field is produced (S2) by means of a second current signal output by the second electrical system (12b) and conducted through the at least one second coil (14b). [10] Method for operating an electromagnetic eddy current brake (10) of a vehicle equipped with a first on-board network (12a) and a second on-board network (12b), comprising the step: Outputting a first current signal through the first on-board network (12a) of the vehicle to at least one first coil (14a) of the eddy current brake (10), which is each electrically connected to the first on-board network (12a), such that a first magnetic field is caused by means of the first current signal conducted through the at least one first coil (14a) (S10); characterized by the step: Outputting a second current signal through the second on-board network (12b) of the vehicle to at least one second coil (14b) of the eddy current brake (10), which is each electrically connected to the second on-board network (12b), such that a second magnetic field is caused by means of the second current signal conducted through the at least one second coil (14b) (S11).

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