METHOD AND DEVICE FOR OPERATING AN ELECTRICALLY DRIVEN VEHICLE

Abstract

A method (400) for operating an electrically driven vehicle (300), comprising the following steps: emitting a signal for controlling (420) a connectable charging means (160) for charging an intermediate circuit capacitor (140); determining (440) a voltage at an intermediate circuit capacitor (140) or of the charge thereof; emitting a signal for closing (460) the switches (130) for connecting the traction battery (150) to the high-voltage grid (110) as a function of the determined voltage or charge.

Claims

1. A method (400) for operating an electrically driven vehicle (300), wherein the vehicle (300) includes a traction battery (150), a high-voltage grid (110) having an intermediate circuit capacitor (140) and high-voltage ports (120) for connecting a charging means (160) for charging the traction battery (150) via the high-voltage grid (110), and at least one switch (130) for electrically disconnecting and connecting the traction battery (150) to the high-voltage grid (110), wherein the high-voltage grid (110) is disconnected from the traction battery (150) by means of at least the one switch or the switches (130), wherein the method comprising the following steps: emitting a signal for controlling (420) the connectable charging means (160) to charge the intermediate circuit capacitor (140); determining (440) the voltage across or the charge of the DC link capacitor (140); and emitting a signal for closing (460) the at least one switch or switches (130) to connect the traction battery (150) to the high-voltage grid (110) as a function of the determined voltage or charge.

2. The method (400) for operating an electrically driven vehicle (300) according to claim 1, wherein the vehicle (300) further comprises a low-voltage grid (115) and a bidirectional DC-DC converter (117) for supplying the low-voltage grid (115) from the high-voltage grid (110) and vice versa, wherein the method further comprises determining (410) an error message from the DC-DC converter (117) before emitting a signal for controlling (420) the connectable charging means (160) to charge the intermediate circuit.

3. The method (400) for operating an electrically driven vehicle (300) according to claim 2, wherein the error message from the DC/DC converter (117) describes an error in the boost operation of the DC/DC converter (117).

4. The method (400) for operating an electrically driven vehicle (300) according to claim 1, wherein the charging means (160) for charging the intermediate circuit capacitor (140) is connected to an external energy source (162).

5. The method (400) for operating an electrically driven vehicle (300) according to claim 2, wherein the step of determining (410) an error message from the DC-DC converter (117) comprises emitting (412) information about establishing a connection to an external power source (162).

6. The method (400) for operating an electrically driven vehicle (300) according to claim 1, comprising the following step: emitting (480) the information about parking the vehicle (300) within range of an external energy source (162) to charge the DC link capacitor (140) by means of a charging means (160), which can be connected to the high-voltage ports (120).

7. A device (100) for operating an electrically driven vehicle (300), wherein the vehicle (300) comprises a traction battery (150), a high-voltage grid (110) having an intermediate circuit capacitor (140) and high-voltage ports (120) for connecting a charging means (160) for charging the traction battery (150) via the high-voltage grid (110), and at least one switch or switch (130) for electrically disconnecting and connecting the traction battery (150) to the high-voltage grid (110), wherein the high-voltage grid (110) is disconnected from the traction battery (150) by means of the at least one switch or switches (130), wherein the device (100) is configured for this purpose, emitting a signal for controlling (420) the connectable charging means (160) for charging (420) the intermediate circuit capacitor (140); to determine the voltage at or the charge of the intermediate circuit capacitor (140); emitting a signal for closing (460) the at least one switch or switches (130) for connecting the traction battery (150) to the high-voltage grid (110) as a function of the determined voltage or charge.

8. (canceled)

9. (canceled)

10. (canceled)

11. A non-transitory computer-readable medium comprising instructions which, when executed by a computer, cause the computer to operate an electrically driven vehicle (300), wherein the vehicle (300) includes a traction battery (150), a high-voltage grid (110) having an intermediate circuit capacitor (140) and high-voltage ports (120) for connecting a charging means (160) for charging the traction battery (150) via the high-voltage grid (110), and at least one switch (130) for electrically disconnecting and connecting the traction battery (150) to the high-voltage grid (110), wherein the high-voltage grid (110) is disconnected from the traction battery (150) by means of at least the one switch or the switches (130), by: emitting a signal for controlling (420) the connectable charging means (160) to charge the intermediate circuit capacitor (140); determining (440) the voltage across or the charge of the DC link capacitor (140); and emitting a signal for closing (460) the at least one switch or switches (130) to connect the traction battery (150) to the high-voltage grid (110) as a function of the determined voltage or charge.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention will be explained in further detail hereinafter with reference to the drawings:

[0026] FIG. 1 a schematic representation of a device for operating an electrically driven vehicle,

[0027] FIG. 2 a schematically represented vehicle comprising a drivetrain.

[0028] FIG. 3 a schematic flow chart for a method of operating an electrically driven vehicle.

DETAILED DESCRIPTION

[0029] FIG. 1 shows a device 100 for operating an electrically driven vehicle. A traction battery 150 can be connected to a high-voltage grid 110 via switches 130. The high-voltage grid 110 comprises an intermediate circuit capacitor 140 and high-voltage ports 120. The high-voltage ports 120 are configured for connecting a charging means 160 for charging the traction battery 150 via the high-voltage grid 110. One or two switches 130 are provided for electrically disconnecting and connecting the traction battery 150 to the high-voltage grid 110. Preferably, the charging means 160 is connected to an external energy source 162 for charging the intermediate circuit capacitor by means of the connectable charging means 160. The device 100 is configured to emit a signal for controlling the connectable charging means 160 for charging the DC link capacitor 140, to determine the voltage at or the charge of the DC link capacitor 140 and to emit a signal for closing one or the switches 130 for connecting the traction battery 150 to the high-voltage grid 110 as a function of the determined voltage or charge. Preferably, the high-voltage grid is connected to a bidirectional DC/DC converter 117 via the high-voltage ports. Preferably, the low-voltage grid 115 is connected to the bidirectional DC/DC converter 117. Preferably, the high-voltage grid 110 is connected to an inverter 185 for converting the direct voltage into a multi-phase alternating voltage for supplying the electric machine 190 of a drivetrain of an electric vehicle.

[0030] FIG. 2 shows a schematic representation of a vehicle 300 comprising a drivetrain 200. The drawing shows an exemplary vehicle comprising four wheels 302, wherein the invention can be used equally in any vehicle comprising any number of wheels on land, on water and in the air. The drivetrain 200 (shown only in an abstract manner in FIG. 2) comprises a device 100 as described and, in particular, a traction battery 150, a high-voltage grid 110, an inverter 185, and/or an electric machine 190 of an electric drive. Such a drivetrain 200 is, e.g., used to drive an electric vehicle 300. The method and the device enable safe operation of the drivetrain 200.

[0031] FIG. 3 shows a schematic sequence of a method 400 for operating an electrically driven vehicle 300. The method starts with step 405. Preferably, an error message from the DC/DC converter 117 is determined in step 410. Preferably, information for establishing a connection to an external energy source is emitted in step 412. In step 420, a signal for controlling 420 the connectable charging means 160 to charge the intermediate circuit capacitor 140 is emitted. In step 440, a voltage or charge in the intermediate circuit capacitor 140 is determined. In step 460, a signal for closing the switches 130 for connecting the traction battery 150 to the high-voltage grid 110 is emitted depending on the determined voltage or charge. Preferably, in step 480, information is emitted for parking the vehicle 300 within range of an external power source 162 for charging the intermediate circuit capacitor 140 by means of a charging means 160 connectable to the high voltage ports 120. The method ends at step 495.