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; 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.
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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; 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. - 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; and generating the motor torque command based on a scaled value of the estimated rack torque value using 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 torque scaling factor.
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Specification