Isolation contactor state control system
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United States of America Patent
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May 16, 2017
Grant Date -
May 14, 2015
app pub date -
Jul 13, 2012
filing date -
Jul 13, 2012
priority date (Note) -
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Abstract
A controller area network (CAN) installed on a hybrid electric vehicle provides one node with control of high voltage power distribution system isolation contactors and the capacity to energize a secondary electro-mechanical relay device. The output of the secondary relay provides a redundant and persistent backup signal to the output of the node. The secondary relay is relatively immune to CAN message traffic interruptions and, as a result, the high voltage isolation contactor(s) are less likely to transition open in the event that the intelligent output driver should fail.
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