Patent ID: 9579977
Date: 2017-02-28
CPC Classifications: B60L,G01R

Claim:
1. An electrified vehicle comprising: a positive bus connectable to a positive output of a DC power source; a negative bus connectable to a negative output of the DC power source; a chassis ground distributed within the vehicle; a first detector circuit with a first sampling switch selectably coupling a first fixed resistance between a first one of the buses and chassis ground, wherein the first detector circuit detects first and second voltages between the chassis ground and a selected one of the buses with the first sampling switch open and closed, respectively; and a control circuit identifying a bus leakage resistance in response to the first and second voltages and a source voltage between the positive and negative outputs of the DC power source without a current measurement, wherein the bus leakage resistance is identified using A) a ratio of the source voltage to one of the first and second voltages, and B) a difference between the first and second voltages.