Prognostic for loss of high-voltage isolation

Details Prognostic for loss of high-voltage isolation Prognostic for loss of high-voltage isolation

2006-11-17

2009-12-01

Nguyen, Tan Q (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Electric vehicle

C701S001000, C701S029000, C318S479000, C180S065230

Reexamination Certificate

active

07627405

ABSTRACT:
A method is provided for predicting a loss of high-voltage isolation within a hybrid, electric, or fuel cell vehicle. The method includes recording the equivalent resistance between a vehicle chassis and a high-voltage bus, detecting a trend in the measurements, and predicting when the resistance will drop below a threshold value. The method also includes issuing a warning or message to the owner/operator when the predicted remaining number of events drops below a predetermined number and/or when the resistance drops below the threshold. Additionally, an apparatus is provided for predicting a high-voltage isolation fault comprising a controller having an algorithm for predicting the fault, a high-voltage bus and bus components, and a reporting device for reporting the fault and/or predetermined number of remaining events. The controller is configured to initiate the algorithm and record a series of equivalent resistance measurements taken between the vehicle chassis and high-voltage bus.

REFERENCES:
patent: 7104347 (2006-09-01), Severinsky et al.
patent: 7237634 (2007-07-01), Severinsky et al.

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