High voltage interlock strategy
First Claim
1. A system for determining a voltage cable connection status, comprising:
- a permanent magnet synchronous machine (PMSM);
a power conversion circuit configured to provide power to said PMSM;
a controller coupled to said power conversion circuit and configured to control said power conversion circuit;
a three-phase high voltage cable configured to electrically connect said power conversion circuit to said PMSM;
at least one sensor configured to detect current conducted by said cable;
a high voltage interlock strategy (HVIS) module configured to determine an operational mode in effect at an electric drive system comprising said PMSM and said power conversion circuit, said operational mode being one among a group comprising a pre-charging mode, a zero current mode and a current-generating mode, receive a feedback current vector characterizing said current detected by said at least one sensor, provide at least one feedback factor by performing a set of operations using at least one components of said received feedback current vector, said set of operations dependent on said operational mode, and use said at least one feedback factor to provide a connectivity status for said cable.
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Accused Products
Abstract
A High Voltage Interlock Strategy (HVIS) uses feedback current to detect cable connectivity status for a high-voltage cable configured to connect a power conversion circuit with a remote permanent magnet synchronous machine (PMSM). One or more feedback factors are calculated based on detected feedback current. Various algorithms for calculating a feedback factor, and for determining connectivity status based on calculated feedback factors, can be practiced, according to the PMSM operational mode. Fault detection action can be performed in response to detecting a cable disconnect. The HVIS can be implemented by software, making it a safe, economical solution for cable connectivity detection.
13 Citations
24 Claims
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1. A system for determining a voltage cable connection status, comprising:
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a permanent magnet synchronous machine (PMSM); a power conversion circuit configured to provide power to said PMSM; a controller coupled to said power conversion circuit and configured to control said power conversion circuit; a three-phase high voltage cable configured to electrically connect said power conversion circuit to said PMSM; at least one sensor configured to detect current conducted by said cable; a high voltage interlock strategy (HVIS) module configured to determine an operational mode in effect at an electric drive system comprising said PMSM and said power conversion circuit, said operational mode being one among a group comprising a pre-charging mode, a zero current mode and a current-generating mode, receive a feedback current vector characterizing said current detected by said at least one sensor, provide at least one feedback factor by performing a set of operations using at least one components of said received feedback current vector, said set of operations dependent on said operational mode, and use said at least one feedback factor to provide a connectivity status for said cable. - View Dependent Claims (2)
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3. A method, comprising:
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a high voltage interlock strategy (HVIS) module apparatus determining that an electric drive system (EDS) comprising a power conversion circuit and a permanent magnet synchronous machine (PMSM) is in a pre-charge mode by detecting that a pre-charging contact at said power conversion circuit is closed; in response to detecting said pre-charging contact is closed, said HVIS module receiving a first feedback current vector, said first feedback current vector representing PMSM feedback current detected at a current sensor; said HVIS module determining a magnitude of said first feedback current vector; said HVIS module providing a first feedback factor comprising said magnitude; said HVIS module comparing said first feedback factor to a predetermined threshold; said HVIS module providing, based on said comparison, a first connectivity status for a high voltage cable configured to electrically couple said power conversion circuit and said PMSM; wherein said HVIS module is configured to determine an operational mode of said EDS is one among a group comprising a pre-charge mode, a zero-current mode and a current-generating mode. - View Dependent Claims (4, 5, 6, 7)
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8. A method for determining voltage cable connection status, comprising:
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a high voltage interlock strategy (HVIS) module determining an operational mode in effect at an electric drive system (EDS) comprising a power conversion circuit and a permanent magnet synchronous machine (PMSM), said HVIS configured to determine that said operational mode is one among a group comprising a pre-charge mode, a zero-current mode or a current-generating mode; said HVIS module receiving a feedback current vector representing said PMSM feedback current detected by a current sensor; said HVIS module providing a feedback factor by performing at least one operation using at least one of said feedback current vector components, said at least one operation dependent on which of said pre-charge mode, said zero-current mode or said current-generating mode is determined to be in effect; said HVIS module providing, based on said feedback factor, a cable connectivity status for a high voltage cable configured to connect said PMSM with said power conversion circuit configured to provide power to said PMSM via said cable; and said HVIS module performing a fault detection action in response to a determination that said cable is disconnected. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method for detecting voltage cable connectivity, comprising:
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a high voltage interlock strategy (HVIS) module determining that an electric drive system (EDS) comprising a permanent magnet synchronous machine (PMSM) is in one of a pre-charge mode, a zero-current mode or a current-generating mode; said HVIS module receiving a feedback current vector representing permanent magnet synchronous machine (PMSM) feedback current detected by a current sensor; receiving at said HVIS module a command current vector characterizing a command current provided for said PMSM; said HVIS module calculating a difference between said command current and said feedback current using said feedback current vector and said command current vector; said HVIS module calculating an average of a square of said difference between said command current and said feedback current over a predetermined period using said calculated difference; said HVIS module calculating a squared difference magnitude using said calculated average; said HVIS module calculating a squared command current magnitude using said command current vector; said HVIS module comparing said squared difference magnitude and said squared command current magnitude; and said HVIS module providing, based on said comparison, a connectivity status of a cable configured to connect said PMSM to a power circuit configured to provide power to said PMSM. - View Dependent Claims (17, 18, 19)
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20. A method for determining a voltage cable connection status, comprising:
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a high voltage interlock strategy (HVIS) module determining that an electric drive system (EDS) comprising a permanent magnet synchronous machine (PMSM) is in one of a pre-charge mode, a zero-current mode or a current-generating mode; said HVIS module receiving a feedback current vector representing said PMSM feedback current detected by a current sensor; said HVIS module receiving a rotational velocity for said PMSM; said HVIS module calculating a feedback current vector magnitude using said feedback current vector; said HVIS module calculating back electromotive force for a permanent magnet synchronous motor (PMSM) using said rotational velocity; said HVIS module calculating an estimated feedback current vector using said calculated back electromotive force; said HVIS module calculating an estimated feedback current vector magnitude using said estimated feedback current vector; said HVIS module comparing said feedback current vector magnitude to said estimated feedback current vector magnitude; and said HVIS module providing a connectivity status of a cable configured to connect said PMSM with a power circuit configured to provide current to said PMSM based on said comparison. - View Dependent Claims (21, 22)
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23. A high voltage interlock strategy (HVIS) module, comprising:
- a non-transitory computer-readable medium having stored thereon sequences of instructions, the sequences of instructions, when executed by a digital processor, cause the processor to determine an operational mode in effect for an electric drive system (EDS) comprising a power conversion circuit and a permanent magnet synchronous machine (PMSM), said operational mode being one of a pre-charge mode, a zero-current mode or a current-generating mode, receive a feedback current vector characterizing feedback current for said PMSM detected by a current sensor, provide a feedback factor by performing a set of operations using at least one of said feedback current vector components, said set of operations determined based on said operational mode, and provide, based on said feedback factor, a connectivity status of a cable configured to connect said PMSM with a power circuit configured to provide current to said PMSM;
said sequences of instructions configured to cause said processor to provide said connectivity status during said pre-charge mode said zero-current mode and said current-generating mode of said EDS. - View Dependent Claims (24)
- a non-transitory computer-readable medium having stored thereon sequences of instructions, the sequences of instructions, when executed by a digital processor, cause the processor to determine an operational mode in effect for an electric drive system (EDS) comprising a power conversion circuit and a permanent magnet synchronous machine (PMSM), said operational mode being one of a pre-charge mode, a zero-current mode or a current-generating mode, receive a feedback current vector characterizing feedback current for said PMSM detected by a current sensor, provide a feedback factor by performing a set of operations using at least one of said feedback current vector components, said set of operations determined based on said operational mode, and provide, based on said feedback factor, a connectivity status of a cable configured to connect said PMSM with a power circuit configured to provide current to said PMSM;
Specification