ELECTRIC DRIVE SYSTEM FOR AN AUTOMOTIVE VEHICLE
First Claim
1. An electric drive system in an automotive vehicle having a three-wire high-voltage cable extending between a drive system inverter and a three-phase permanent-magnet synchronous motor, the system comprising:
- a current transformer positioned to detect a high-frequency common-mode current flowing through the cable to obtain a common-mode current signal; and
a controller configured to determine a condition of the electric drive system in response to the common-mode current signal.
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Accused Products
Abstract
An electric drive system in an automotive vehicle includes a controller for determining a condition of the electric drive system. The electric drive system includes only two current sensors and a common-mode current transformer. In response to the current sensors and the common-mode current transformer, the controller determines the condition of the electric drive system. The condition of the electric drive system may depend on a condition of an electrical connection between a drive system inverter and a motor in the electric drive system as well as a calculated amount of error in the electric drive system. In addition, the controller may control various operations of the electric drive system, which may or may not depend on the condition of the electric drive system.
25 Citations
20 Claims
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1. An electric drive system in an automotive vehicle having a three-wire high-voltage cable extending between a drive system inverter and a three-phase permanent-magnet synchronous motor, the system comprising:
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a current transformer positioned to detect a high-frequency common-mode current flowing through the cable to obtain a common-mode current signal; and a controller configured to determine a condition of the electric drive system in response to the common-mode current signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electric drive system in an automotive vehicle having a three-wire high-voltage cable extending between a drive system inverter and a three-phase permanent-magnet synchronous motor (PMSM), first and second current sensors generating respective first and second sensor signals indicating respective first and second amounts of current flowing through the cable, and a resolver generating a resolver signal having position information of the motor, the system comprising:
a controller configured to receive the first and second sensor signals as well as the resolver signal, calculate an amount of error between calculated currents and estimated currents in response to first and second sensor signals as well as the resolver signal, and determine the condition of the electric drive system based on the amount of error. - View Dependent Claims (15, 16, 17, 18)
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19. An electric drive system in an automotive vehicle, the system comprising:
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a drive system inverter; a three-phase permanent-magnet synchronous motor; a three-wire high-voltage cable extending between the drive system inverter and the three-phase permanent-magnet synchronous motor; a pair of current sensors configured to generate respective sensor signals indicating respective amounts of current flowing through the three-wire high-voltage cable; a resolver generating a resolver signal having position information of the motor; a voltage source inverter in the drive system inverter and configured to generate a high-frequency common-mode pulse-width-modulated voltage and to apply the high-frequency common-mode pulse-width-modulated voltage between the drive system inverter and the motor to selectively provide common-mode current through the three-wire high-voltage cable; a current transformer including secondary windings for sensing a high-frequency common-mode current flowing through the three-wire high-voltage cable and a processor configured to receive the high-frequency common-mode current from the secondary windings and generate a common-mode current signal embedding high-frequency common-mode current information; and a controller comparing the high-frequency common-mode current information to a predetermined common-mode current threshold to determine whether the cable provides an electrical connection between the drive system inverter and the motor; receiving the respective sensor signals and the resolver signal to calculate an amount of error between calculated currents and estimated currents; and determining a condition of the electric drive system based on whether the cable provides the electrical connection as well as the amount of error between the calculated currents and the estimated currents. - View Dependent Claims (20)
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Specification