Device for detecting the insulation resistance of a high voltage battery system

摘要

A device for detecting the insulation resistance of a high-voltage battery system of a motor vehicle that includes a high-voltage battery and a high-voltage component which is operatively connected to terminals of the high-voltage battery via converters. The device includes a reference resistor operatively connected to the terminals of the high-voltage battery via switches, with a voltage measurement device configured to detect the voltage present between each respective terminal and a reference potential of the vehicle; a voltage measurement device configured to measure the voltage between the terminals; and a coupling circuit configured to monitor the high-voltage component when the contactors are open.

主权项

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.