Patent ID: 9244108
Filing Date: 2016-01-26
CPC Classification: B60L,G01R,Y02T

Claim Text:
1. A device for detecting insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery, the device comprising: a high-voltage component operatively connected to a first terminal and a second terminal of the high-voltage battery using contactors; reference resistors operatively connected to the first terminal and the second terminal of the high-voltage battery via a respective first switch and a second switch, with a voltage measurement device configured to detect voltage values present between the first terminal and the second terminal and a reference potential of the vehicle; a controller operatively connected to the first switch and the second switch and the voltage measurement device and configured to detect the voltage values present between the first terminal and the second terminal and the reference potential of the vehicle; and a coupling circuit configured to monitor the high-voltage component when the contactors are open, the coupling circuit having a third switch and at least one coupling resistor connected directly to the first terminal of the high-voltage battery via the third switch, wherein the insulation resistance of the high-voltage battery is measured by alternately switching the reference resistors to the first terminal and the second terminal, and the insulation resistance of the high-voltage component is measured by coupling the high-voltage component to the high-voltage battery.