ELECTRICAL DRIVE SYSTEM FOR AN ELECTRICALLY OPERATED VEHICLE, AND METHOD FOR INDUCTIVELY CHARGING AN ENERGY STORAGE DEVICE OF AN ELECTRICALLY OPERATED VEHICLE

Abstract

The present invention provides an electrical drive system (1) for an electrically operated vehicle (F1), comprising an electrical machine (EM) by means of which a traction drive of the electrically operated vehicle (F1) can be driven; an energy storage device (B) by means of which the electrical machine (EM) can be operated; an inverter device (INV) by means of which the energy storage device (B) is connected to the electrical machine (EM); a first inductance (L1) by means of which the energy storage device (B) can be inductively charged, wherein the electrical machine (EM) comprises a housing (3) and the first inductance (L1) is integrated into the housing (3) or is arranged directly on the housing (3); and a converter device (W), which is connected to the first inductance (L1) and to the energy storage device (B), for charging the energy storage device (B).

Claims

1. An electric drive system (1) for an electrically operated vehicle (F1) comprising: an electric machine (EM) configured to drive a traction drive of the electrically operated vehicle (F1), an energy storage device (B), by way of which the electric machine (EM) may be operated, an inverter facility (INV), by way of which the energy storage device (B) is connected to the electric machine (EM), a first inductance (L1), by way of which the energy storage device (B) may be inductively charged, wherein the electric machine (EM) comprises a housing (3) and the first inductance (L1) is integrated into the housing (3) or is arranged on the housing (3), and a converter facility (W) which is connected to the first inductance (L1) and to the energy storage facility (B) so as to charge the energy storage device (B).

2. The electric drive system (1) as claimed in claim 1, wherein the inverter facility (INV) is arranged in an electronics housing (4) that is arranged directly on the electric machine (EM).

3. The electric drive system (1) as claimed in claim 2, wherein the electronics housing (4) comprises the converter facility (W).

4. The electric drive system (1) as claimed in claim 2, wherein the electronics housing (4) is arranged directly on the housing (3).

5. The electric drive system (1) as claimed in claim 1, wherein the electric machine (EM) is integrated into an electric drive axle (EA) of the electrically operated vehicle (F1).

6. The electric drive system (1) as claimed in claim 5, wherein the electric drive axle (EA) is integrated in a front axle (V) and/or in a rear axle (H) of the electrically operated vehicle (F1).

7. The electric drive system (1) as claimed in claim 3, wherein the electronics housing (4) comprises a plug facility (5) by means of which the energy storage device (B) is connected to the inverter facility (INV) and to the converter facility (W).

8. The electric drive system (1) as claimed in claim 1, that comprises a control facility (SE) configured to control the inverter facility (INV) and/or the converter facility (W).

9. The electric drive system (1) as claimed in claim 1, which comprises a cooling system (KS) for the electric machine and/or for the inverter facility (INV) and/or for the converter facility (W).

10. The electric drive system (1) as claimed in claim 9, wherein the inverter facility (INV) is arranged in an electronics housing (4) that is arranged directly on the electric machine (EM), and wherein the electronics housing (4) comprises the cooling system (KS).

11. The electric drive system (1) as claimed in claim 1, which comprises a communication facility (KE).

12. The electric drive system (1) as claimed in claim 1, which comprises an object detection apparatus (7) configured during the inductive charging procedure to detect a foreign object (FO) between the first inductance (L1) and a second inductance (L2) that is required for the inductive charging procedure.

13. The electric drive system (1) as claimed in claim 1, wherein the first inductance (L1) is arranged on a lower face (2) of the electric machine (EM).

14. A method for inductively charging an energy storage device (B) of an electrically operated vehicle (F1) having the steps: S1) providing an electric drive system (1) as claimed in claim 1; S2) positioning the electrically operated vehicle (F1) over a second inductance (L2) in such a manner that the first inductance (L1) is positioned in a magnetic field of the second inductance (L2); and S3) inductively charging the energy storage device (B) by way of the first inductance (L1).

15. The method as claimed in claim 14, wherein in the method step S3 an object detection apparatus (7) detects a foreign object (FO) in the magnetic field between the first inductance (L1) and the second inductance (L2) and the inductive charging procedure is immediately terminated.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention is further explained below with reference to the exemplary embodiments illustrated in the schematic figures of the drawing.

[0042] In the drawing:

[0043] FIG. 1 illustrates a schematic lateral view of an electric drive system for an electrically operated vehicle in accordance with an exemplary embodiment of the present invention;

[0044] FIG. 2 illustrates a view of an electric drive axle with an electric drive system;

[0045] FIG. 3 illustrates a schematic plan view of an electrically operated vehicle with an electric drive system in accordance with an exemplary embodiment of the present invention;

[0046] FIG. 4 illustrates a schematic lateral view of an electrically operated vehicle with an electric drive system in accordance with one embodiment of the present invention; and

[0047] FIG. 5 illustrates a block diagram of the method steps in accordance with one exemplary embodiment of the method of the present invention.

[0048] In the figures, identical reference numerals identify like or like-functioning elements.

DETAILED DESCRIPTION

[0049] FIG. 1 illustrates a schematic lateral view of an electric drive system for an electrically operated vehicle in accordance with an exemplary embodiment of the present invention.

[0050] An electric machine EM is arranged in a housing 3 that may advantageously comprise a cast part. The first inductance L1, advantageously as a plate having a coil, is arranged on a lower face 2 of the electric machine EM with the result that said inductance may face a primary coil for the inductive charging procedure. The first inductance is in this case at least in part integrated into the housing 3, however it may also be arranged on the outside of the housing 3 and connected to the electronics housing 4 by means of electrical conductors, possibly Cu-lines (double arrow, which may be produced in an advantageously cost-effective manner). The electrical conductors advantageously extend within an electrically shielded housing 3 or outside the housing and in this case they themselves comprise an electrical shielding arrangement (insulation). The inverter facility INV and the converter facility W are advantageously arranged jointly in the electronics housing 4 as a shared-accommodation arrangement and are connected by means of internal plug connections or electrical conductors (bus bars) to a plug facility 5. A second converter facility (not illustrated) may also be advantageously accommodated in the electronics housing 4, said converter facility is connected to the inverter facility and when the electric machine is functioning in an recovery mode said converter facility may be used for charging the energy storage device B. The second converter facility may also be arranged separately and outside the electronics housing 4. The plug facility 5 connects the electronics housing 4 to the energy storage device B in an electrical manner by way of the supply lines (bus bars) or plugs (arrow illustration). In the interior of the electronics housing 4, electrical conductors (bus bars) connect the converter facility W and the inverter facility INV to the plug facility 5, wherein in each case advantageously a 2 phase connection is guided to the converter facility W and the inverter facility INV. In the electric drive system 1, the electric machine having the housing 3 and the electronics housing 4 and the first inductance L1 are advantageously combined as a compact electric axle. Furthermore, the electronics housing 4 comprises a cooling system KS that extends advantageously into the region of the inverter facility INV and into the region of the direct converter facility W. It is possible in this manner to reduce the number of plugs, supply lines, cooling system connections and housings.

[0051] FIG. 2 illustrates a view of an electric drive axle with an electric drive system.

[0052] The housing 3 having the electric machine EM integrated therein is connected to a drive axle (transmission), advantageously integrated therein, which is described as an electric axle EA. The electronics housing 4 is advantageously placed directly (with supply lines or plug connections, Cu-conductors or as Cu-rails) on the housing 3 and for space-saving reasons is configured as planar as possible.

[0053] FIG. 3 illustrates a schematic plan view of an electrically operated vehicle having an electric drive system in accordance with an exemplary embodiment of the present invention.

[0054] The electrically operated vehicle F1 comprises a front axle V and a rear axle H, wherein the electric axle EA may be integrated into the front axle V and/or into the rear axle H. In the plan view of FIG. 3, the electric drive system 1 is visible on the rear axle and comprises a housing 3 having the electric machine EM, wherein the electronics housing 4 is arranged on the housing 3. The first inductance L1 is arranged below the housing 3 and may protrude sideward beyond the axle EA and also the housing 3, however, in a planar manner it may also be smaller or equal in size to the housing 3.

[0055] FIG. 4 illustrates a schematic lateral view of an electrically operated vehicle having an electric drive system in accordance with an exemplary embodiment of the present invention.

[0056] The electrically operated vehicle F1 comprises an electric drive system 1, which is integrated in the front axle V that represents the electric axle EA. During the inductive charging procedure, the electrically operated vehicle F1 may be positioned over a second inductance L2 so that the first inductance L1 experiences the magnetic field M of the second inductance L2 (also conversely during the supply of energy from the energy storage device B into a power supply system, possibly as a v2grid). An object detection apparatus 7 which may detect a foreign object FO in the magnetic field M is located in the region of the first inductance L1. The housing 3 having the electric machine EM and the electronics housing 4 is integrated into the electric axle EA on the front axle V. A control facility SE and the energy storage device B and the communication facility KE (by way of example also the object detection apparatus having a corresponding algorithm) are by way of example arranged separately from the axle EA in the vehicle F1 and may also comprise a dedicated housing. Alternatively, at least one of them may also be integrated into the electronics housing 4 or into the electric axle EA.

[0057] FIG. 5 illustrates a block diagram of the method steps in accordance with an exemplary embodiment of the method of the present invention.

[0058] The method steps S1, S2 and S3 are advantageously performed one after the other.

[0059] Although the present invention has been fully described above with reference to the preferred embodiments, the invention is not limited thereto but rather may be modified in numerous ways.