Invention Application
- Patent Title: METHOD FOR MEASURING ELECTRICAL ISOLATION OF A VEHICLE CHASSIS
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Application No.: US14975289Application Date: 2015-12-18
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Publication No.: US20170176509A1Publication Date: 2017-06-22
- Inventor: Steven E. Schulz
- Applicant: Faraday&Future Inc.
- Main IPC: G01R31/00
- IPC: G01R31/00 ; G01R31/12

Abstract:
A method for measuring the isolation resistance between a chassis and a battery terminal in an electric vehicle. The method can include measuring an open voltage (VP(open)) of the positive terminal; measuring an open voltage (VN(open)) of the negative terminal; measuring a voltage (VN(S1 closed)) between the negative terminal and the chassis with switch S1 closed; measuring a voltage (VP(S1 closed)) between the positive terminal and the chassis with switch S1 closed; calculating the ratio (VP(open)/VN(closed)) of the voltages VP(open) and VN(closed); calculating the open ratio of the open voltages (VP(open)/VN(open)); calculating the difference between the ratio (VP(S1 closed)/VN(S1 closed)) and the open ratio (VP(open)/VN(open)); and multiplying the value of the test resistor (R0) by the difference between the ratio (VP(S1 closed)/(VN(S1 closed)) and the open ratio (VP(S2 open)/VN(S1 open)) to obtain the isolation resistance.
Public/Granted literature
- US10126344B2 Method for measuring electrical isolation of a vehicle chassis Public/Granted day:2018-11-13
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