Decoupling current control utilizing direct plant modification in electric power steering system
First Claim
1. A system for controlling an electric motor that generates an output current from an input voltage command, the system comprising:
- a first module configured to;
receive the output current from the electric motor as a feedback, the output current including a direct axis (d-axis) component and a quadrature axis (q-axis) component;
generate a first voltage command based on an artificial resistance value (Rd, and Rq) and the feedback by using a transfer matrix
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Abstract
A method of controlling an electric motor that generates an output current from an input voltage command that includes a sum of a first voltage command and a second voltage command is provided. The method receives the output current from the motor as a feedback. The method determines a first set of gain factors to generate the first voltage command based on the feedback such that the input voltage command causes the motor to generate the output current with reduced influence of variations of a set of operating parameters of the motor. The method determines a difference between the feedback and a desired current. The method determines a second set of gain factors to generate the second voltage command based on the difference such that the input voltage command causes the motor to generate the output current as a first, second or higher order response.
96 Citations
17 Claims
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1. A system for controlling an electric motor that generates an output current from an input voltage command, the system comprising:
a first module configured to; receive the output current from the electric motor as a feedback, the output current including a direct axis (d-axis) component and a quadrature axis (q-axis) component; generate a first voltage command based on an artificial resistance value (Rd, and Rq) and the feedback by using a transfer matrix - View Dependent Claims (2, 3, 4, 10, 11, 12, 13)
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5. A method of controlling an electric motor of a system, wherein the electric motor generates an output current from an input voltage command, the method comprising:
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receiving the output current from the electric motor as a feedback; generating a first voltage command based on an artificial resistance value (Rd, and Rq) and the feedback by using a transfer matrix that includes the artificial resistance value (Rd, and Rq) in off-diagonal elements for desensitizing a current drawn by the electric motor from variations of motor operation parameters based on negative values of the artificial resistance value; determining a difference between the feedback and a desired current; generating a second voltage command based on an estimated inductance value of the electric motor and a frequency response characteristic of the system, which is a closed-loop system; generating the input voltage command for the electric motor by adding the first voltage command and the second voltage command; and applying the input voltage command to the electric motor to generate corresponding amount of torque. - View Dependent Claims (6, 7, 8, 9, 14, 15, 16, 17)
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Specification