Driver intent estimation without using torque sensor signal
First Claim
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1. A power steering system for providing a motor torque assist command, the power steering system comprising:
- a rack torque estimator module that determines an estimated rack torque value based on a motor angle, and a motor velocity;
a driver intent detection module that computes a disturbance torque scaling factor based on the estimated rack torque value by computing a disturbance torque signal based on the estimated rack torque value; and
a blend module that generates the motor torque assist command based on a scaled value of the estimated rack torque value using the disturbance torque scaling factor, the scaling comprising multiplying the estimated rack torque value by the disturbance torque scaling factor.
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Abstract
A system for determining driver torque includes a rack torque estimator module that determines an estimated rack torque value based on a motor angle, and a motor velocity. The system further includes a driver intent detection module that computes a disturbance torque scaling factor based on the estimated rack torque value. The system further includes a blend module that generates a motor torque assist command based on a scaled value of the estimated rack torque value using the disturbance torque scaling factor.
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Citations
22 Claims
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1. A power steering system for providing a motor torque assist command, the power steering system comprising:
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a rack torque estimator module that determines an estimated rack torque value based on a motor angle, and a motor velocity; a driver intent detection module that computes a disturbance torque scaling factor based on the estimated rack torque value by computing a disturbance torque signal based on the estimated rack torque value; and a blend module that generates the motor torque assist command based on a scaled value of the estimated rack torque value using the disturbance torque scaling factor, the scaling comprising multiplying the estimated rack torque value by the disturbance torque scaling factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing a motor torque assist command by a power steering system, the method comprising:
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determining an estimated rack torque value based on a motor angle, and a motor velocity; computing a disturbance torque scaling factor based on the estimated rack torque value by computing a disturbance torque signal based on the estimated rack torque value; and generating the motor torque command based on a scaled value of the estimated rack torque value using the disturbance torque scaling factor, the scaling comprising multiplying the estimated rack torque value by the disturbance torque scaling factor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A power steering system for providing motor torque assist command, the power steering system comprising:
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a torque sensor configured to detect a driver torque signal from a handwheel of the power steering system; and a control module configured to; in response to the torque sensor operating without a failure; determine a first estimated rack torque value based on a motor angle, a motor velocity, and the driver torque signal; and generate a first motor torque assist command based on the first estimated rack torque value; and in response to detecting a failure of the torque sensor; determine a second estimated rack torque value based on the motor angle, and the motor velocity; compute a disturbance torque scaling factor based on the second estimated rack torque value; and generate a second motor torque assist command based on a scaled value of the second estimated rack torque value using the disturbance toque scaling factor, the scaling comprising multiplying the second estimated rack torque value by the disturbance torque scaling factor.
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Specification