Method and apparatus for detecting faults in a current sensing device
First Claim
1. Method for monitoring a current sensing system operative to monitor electrical current in a transmission line between an electrical storage device and an electrical machine comprising:
- providing a current sensing system comprising a first current sensor located between an electrical storage device and an electrical machine and linearly operative over a first range of electrical current to monitor a transmission line electrical current comprising an electrical current flowing between the electrical storage device and the electrical machine and to provide a first output of magnitude of the transmission line electrical current, and a second current sensor located between the electrical storage device and the electrical machine and linearly operative over a second range of electrical current that includes said first range of electrical current to monitor the transmission line electrical current and to provide a second output of magnitude of the transmission line electrical current; and
receiving the first and second outputs at a control module, the control module being programmed to compare the first and second outputs of the magnitudes of the transmission line electrical current when the first and second outputs of the magnitudes of the transmission line electrical current are within said first range of electrical current and to output an indication of a first fault in the current sensing system when a difference between the first and second outputs of the magnitudes of the transmission line electrical current exceeds a summation of a first measurement accuracy of the first current sensor and a second measurement accuracy of the second current sensor.
13 Assignments
0 Petitions
Accused Products
Abstract
A method and article of manufacture are provided to monitor a sensing system operative to monitor electrical current in a transmission line between an electrical storage device and an electrical machine. The sensing system comprises first and second sensors, operative to monitor first and second ranges of electrical current. The method comprises determining outputs of the first and second sensors are valid, and comparing outputs of the first and second sensors when current is substantially zero. The method comprises comparing magnitudes of the outputs of the first and second sensors when the monitored electrical current, and monitoring polarity of each of the outputs of the first and second sensors.
110 Citations
13 Claims
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1. Method for monitoring a current sensing system operative to monitor electrical current in a transmission line between an electrical storage device and an electrical machine comprising:
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providing a current sensing system comprising a first current sensor located between an electrical storage device and an electrical machine and linearly operative over a first range of electrical current to monitor a transmission line electrical current comprising an electrical current flowing between the electrical storage device and the electrical machine and to provide a first output of magnitude of the transmission line electrical current, and a second current sensor located between the electrical storage device and the electrical machine and linearly operative over a second range of electrical current that includes said first range of electrical current to monitor the transmission line electrical current and to provide a second output of magnitude of the transmission line electrical current; and receiving the first and second outputs at a control module, the control module being programmed to compare the first and second outputs of the magnitudes of the transmission line electrical current when the first and second outputs of the magnitudes of the transmission line electrical current are within said first range of electrical current and to output an indication of a first fault in the current sensing system when a difference between the first and second outputs of the magnitudes of the transmission line electrical current exceeds a summation of a first measurement accuracy of the first current sensor and a second measurement accuracy of the second current sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Powertrain system, comprising:
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an electrical storage device electrically connected by a transmission line to an electrical machine operative to transmit motive torque to a vehicle driveline; a current sensing system operative to monitor a total electrical current flow between the electrical machine and the electrical storage device comprising a first current sensor located between the electrical storage device and the electrical machine and linearly operative over a first range of electrical current to monitor the total electrical current flow and to provide a first output of magnitude and direction of the total electrical current flow and a second current sensor located between the electrical storage device and the electrical machine and linearly operative over a second range of electrical current that includes said first range of electrical current to monitor the magnitude and the direction of the total electrical current flow and to provide a second output of magnitude and direction of the total electrical current flow; a control system; adapted to monitor the electrical storage device and control the electrical machine; and including a control module comprising a storage medium having a computer program encoded therein, the program being executed by the control module to monitor operation of the current sensing system, the program comprising; code for identifying a fault in the current sensing system based upon the first and second outputs of the magnitudes of the total electrical current flow; code for providing an output indicating the identified fault in the current sensing system. - View Dependent Claims (11, 12, 13)
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Specification