METHOD FOR DETERMINING THE ABSENCE OF VOLTAGE IN AN ELECTRICAL HIGH-VOLTAGE SYSTEM, AND ELECTRICAL HIGH-VOLTAGE SYSTEM

• US 20150192623A1
• Filed: 12/14/2012
• Published: 07/09/2015
• Est. Priority Date: 12/24/2011
• Status: Active Grant

• Current Assignee: Volkswagen AG
• Original Assignee: Volkswagen AG
• Inventors: Lachmund, Uwe, Hnsch, Ronny
• Granted Patent: US 9,500,680 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 58/10 for monitoring or controlling batteries
• CPC Class Codes: G01R 19/0084 measuring voltage only all subgroups of G01R19/00 take precedence
• CPC Class Codes: G01R 19/155 Indicating the presence of voltage
• CPC Class Codes: G01R 19/165 Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
• CPC Class Codes: G01R 31/006 on road vehicles, e.g. automobiles or trucks testing of ignition installations peculiar to internal combustion engines F02P17/00
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A method for determining the absence of voltage in an electrical high-voltage system, in particular in an electric or hybrid vehicle, by using at least two control units in the high-voltage system and at least one display unit, wherein the control units detect the voltage in the high-voltage system independently of one another, wherein an absence of voltage is displayed on the display unit only if both control units detect a voltage below a threshold value. Also disclosed is an electrical high-voltage system.

Claims

1. A method for checking safe isolation from the supply in a high-voltage electrical system in an electric or hybrid vehicle, by using at least two control devices in the high-voltage system and at least one display unit, wherein

the control devices detect, independently of one another, the voltage in the high-voltage system, wherein safe isolation from the supply is only displayed on the display unit when the control devices involved detect a voltage below a threshold value.

2. The method of claim 1, wherein at least the detected actual values for the voltage are represented on at least one further display unit.

3. The method claim 1, wherein an external diagnosis device is connected to the control devices in the high-voltage system via a gateway control device and/or is connected directly to individual control devices.

4. The method of claim 3, wherein a state of safe isolation from the supply and/or the detected actual values is/are represented on a display unit of the diagnosis device and a state of safe isolation from the supply and/or the detected actual values are represented on a display unit of an electric or hybrid vehicle.

5. The method of claim 3, wherein at least one message is transmitted to at least one control device by the diagnosis device, whereby the checking of safe isolation from the supply is initiated.

6. The method of claim 1, wherein the control devices for detecting the voltage are at least one battery management control device and/or a control device of a high-voltage component of the high-voltage system of the vehicle.

7. The method of claim 6, further comprising a control device of a charger detecting a voltage and/or a control device of a charge manager detecting the plug state of at least one electrical socket outlet.

8. A high-voltage electrical system, an electric or hybrid vehicle, the system comprising at least two control devices and at least one display unit, wherein

the control devices detect, independently of one another, the voltage in the high-voltage system, wherein safe isolation from the supply is only displayed on the display unit when both control device detect a voltage below a threshold value.

9. The system of claim 8, wherein at least the detected actual values for the voltage are represented on at least one further display unit.

10. The system of claim 8, wherein an external diagnosis device is connected to the control devices in the high-voltage system via a gateway control device and/or is connected directly to individual control devices.

11. The system of claim 10, wherein a state of safe isolation from the supply and/or the detected actual values is/are represented on a display unit of the diagnosis device and a state of safe isolation from the supply and/or the detected actual values are represented on a display unit of an electric or hybrid vehicle.

12. The system of claim 11, wherein at least one message is transmitted to at least one control device by the diagnosis device, whereby the checking of safe isolation from the supply is initiated.

13. The system of claim 8, wherein the control devices for detecting the voltage are at least one battery management control device and/or a control device of a high-voltage component of the high-voltage system of the vehicle.

14. The system of claim 13, further comprising a control device of a charger detecting a voltage and/or a control device of a charge manager detecting the plug state of at least one electrical socket outlet.