Vehicle high/low voltage systems isolation testing
AssigneeFord Global Technologies, LLC
InventorMichael Edward Loftus
Life of this patent
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Abstract
Systems or methods for testing performance of an isolation monitor for a vehicle having a high voltage traction battery electrical system isolated from a low voltage electrical system include a device for connecting to an isolation/leakage monitor under test. The device includes a current leakage bus, a current leakage array, and a current leakage destination with associated switching elements automatically controlled by a programmed microprocessor to introduce various leakage impedances to a second voltage source or ground and to evaluate performance of the isolation/leakage monitor under test.
Claims19
An isolation monitor performance tool comprising:
- at least one impedance;
- at least one leakage destination;
- a plurality of switches associated with each of the at least one impedance, the at least one leakage destination, and a plurality of terminals of a battery cell string;
- and
- a controller programmed to operate the plurality of switches to selectively connect a leakage destination through a selected impedance to a selected terminal to vary a leakage impedance detected by an isolation monitor.
A method of testing an isolation monitor comprising:
- activating, by a controller, a combination of switching elements to connect at least one impedance between a selected one of a plurality of leakage destinations and a selected terminal of a battery cell string, wherein the combination causes a predetermined leakage current to be applied to the isolation monitor and for which there is associated an expected response of the isolation monitor;
- receiving, from the isolation monitor, a diagnostic code indicative of isolation detection;
- and
- outputting a status indicative of proper behavior responsive to the diagnostic code matching the expected response of the isolation monitor to the combination.
A battery simulator comprising:
- a plurality of voltage sources each having at least one terminal;
- a plurality of impedances;
- a plurality of leakage destinations;
- a plurality of switches associated with the plurality of impedances, the plurality of leakage destinations, and the terminals;
- and
- a controller programmed to operate the plurality of switches to selectively connect one of the plurality of leakage destinations through a selected impedance to a selected terminal to vary a leakage impedance detected by an isolation monitor.
Dependencies are inferred from the claim text.