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Method and apparatus for detecting leakage resistance in an electric vehicle
U.S. Patent Number: 5382946
Abstract: Provided is a method and circuit for measuring the leakage path resistance in an electric vehicle having an isolated high voltage traction battery and an auxiliary battery grounded to the vehicle. The circuit operates by periodically applying a selected excitation signal and comparing the voltage induced on an energy storage element by the excitation signal to a selected reference voltage during a selected time period. An alternate embodiment of the present invention provides a circuit which operates by applying a periodic excitation signal and comparing the phase shift of the voltage induced on an energy storage element to the phase shift of a signal derived from the excitation signal.
Inventors: Gale; Allan R. (Allen Park, MI)
Assignee: Ford Motor Company (Dearborn, MI)
Application Number: 08/001,957
Issued: 1995-01-17
Expired: 2007-01-17
Classes: 340/650 ; 324/510; 361/42
Field of search: 340/650,651 361/42,45 324/509,510
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