Patent ID: 9696384
Date: 2017-07-04
CPC Classifications: G01R,H01M,Y02E

Claim:
1. A method of simultaneously calculating an isolation resistance and a y-capacitance of a rechargeable energy storage system (RESS), the method comprising: injecting, via a wire electrically coupled to the RESS, a first signal into the RESS, the RESS having a charge capable of providing propulsive and other electric power to a vehicle; recording, via a sensor, an output signal from the RESS in response to the injection of the first signal; multiplying, via at least one multiplier, the first signal with the output signal to determine a first product; multiplying, via the at least one multiplier, a second signal with the output signal to determine a second product, the second signal being orthogonal to the first signal; filtering, via at least one filter, the first product to determine a first constant; filtering, via the at least one filter, the second product to determine a second constant; processing, via at least one processor, the first constant to determine a y-capacitance value; and processing, via the at least one processor, the second constant to determine an isolation resistance value; controlling, in response to the y-capacitance value or the isolation resistance value being in excess of the predetermined value, the RESS to operate the RESS in excess of the predetermined value.