Prognostic for loss of high-voltage isolation
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01R-031/02
G06F-019/00
출원번호
UP-0561125
(2006-11-17)
등록번호
US-7627405
(2009-12-16)
발명자
/ 주소
Tarchinski, James E.
Mc Donald, Mike M.
출원인 / 주소
GM Global Technology Operations, Inc.
인용정보
피인용 횟수 :
1인용 특허 :
2
초록▼
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 wi
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.
대표청구항▼
The invention claimed is: 1. A method for predicting a loss of high-voltage circuit isolation in a hybrid, electric, or fuel cell vehicle, the method comprising: measuring a series of equivalent electrical resistance level readings taken between a chassis and a high-voltage bus of said vehicle, whe
The invention claimed is: 1. A method for predicting a loss of high-voltage circuit isolation in a hybrid, electric, or fuel cell vehicle, the method comprising: measuring a series of equivalent electrical resistance level readings taken between a chassis and a high-voltage bus of said vehicle, wherein each element of said series is measured upon the occurrence of a discrete, predetermined independent event; performing a data fitting analysis on said series to detect a numerical trend within said series; and using said trend to determine the estimated number of remaining independent events before said electrical resistance will be less than a predetermined threshold resistance. 2. The method of claim 1, wherein said independent event is a key-down sequence. 3. The method of claim 1, wherein said series is recorded into a storage device. 4. The method of claim 3, wherein said storage device is a circular buffer having a capacity of approximately 25 to 35 measurements. 5. The method of claim 1, wherein said data fitting analysis is second order least-squares regression. 6. The method of claim 1, including a recording device, wherein said recording device is configured to generate an audio or visual warning when said number of remaining independent events reaches a predetermined threshold. 7. A method for predicting a loss of high-voltage circuit isolation within a hybrid vehicle having a chassis and a high-voltage bus, the method comprising: determining whether a predetermined independent variable event has occurred; measuring and recording an equivalent resistance value taken between said chassis and said high-voltage bus; storing said value in a storage array until said array reaches a predetermined sample population; performing a data fitting analysis on said sample population to detect a trend in said population; and using said trend to calculate the number of said independent events remaining until said equivalent resistance is less than a predetermined threshold value. 8. The method of claim 7, wherein said independent event is a key-down sequence. 9. The method of claim 7, wherein said series is recorded into a storage device. 10. The method of claim 9, wherein said storage device is a circular buffer having a capacity of approximately 25 to 35 measurements. 11. The method of claim 7, wherein said data fitting analysis is second order least-squares regression. 12. The method of claim 7, including a reporting device, wherein said device is configured to communicate a warning when said number of remaining events reaches a predetermined threshold value. 13. An apparatus for predicting a loss of high-voltage circuit isolation within a hybrid vehicle having a chassis and a high-voltage bus, the apparatus comprising: a controller having memory and a control algorithm for predicting a high-voltage isolation fault; a plurality of high-voltage bus components operatively connected to said high-voltage bus; and a reporting device operable for reporting said predicted high-voltage isolation fault; wherein said controller is configured to initiate said algorithm upon the occurrence of a predetermined independent event, said algorithm including recording into said memory a series of periodic measurements of the equivalent resistance between said chassis and said bus, and predicting the number of said events remaining before said resistance reaches a predetermined threshold. 14. The apparatus of claim 13, wherein said reporting is selected from the group consisting of an instrument panel indicator lamp, textual message, and audible signal. 15. The apparatus of claim 13, wherein said memory is a circular buffer having a capacity of approximately 25 to 35 measurements. 16. The apparatus of claim 13, wherein said predetermined independent event is a key-down sequence.
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