Model based driver torque estimation
First Claim
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1. A control system for a power steering system, the system comprising:
- a processor; and
a memory that includes instructions that, when executed by the processor, cause the processor to;
generate an error signal based on a difference of an estimated output vector and an output vector;
calculate a feedback correction signal based on the error signal and an observer gain value, the feedback correction signal reducing the difference of the estimated output vector and the output vector by driving the error signal to approach zero;
determine an extended state vector estimate based on the feedback correction signal and a motor torque command; and
apply a gain to the extended state vector estimate to generate an estimated driver torque signal, the estimated driver torque signal is applied in control of the power steering system, wherein the extended state vector approaches an actual state vector.
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Abstract
A control system for a power steering system includes an error module that generates an error signal based on a difference of an estimated output vector and an output vector, a scaling module that calculates a feedback correction signal based on the error signal and an observer gain value, an extended state vector estimation module that determines an extended state vector estimate based on the feedback correction signal and a motor torque command, and a gain module that applies a gain to the extended state vector estimate to generate an estimated driver torque signal, the estimated driver torque signal is applied in control of the power steering system.
138 Citations
17 Claims
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1. A control system for a power steering system, the system comprising:
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a processor; and a memory that includes instructions that, when executed by the processor, cause the processor to; generate an error signal based on a difference of an estimated output vector and an output vector; calculate a feedback correction signal based on the error signal and an observer gain value, the feedback correction signal reducing the difference of the estimated output vector and the output vector by driving the error signal to approach zero; determine an extended state vector estimate based on the feedback correction signal and a motor torque command; and apply a gain to the extended state vector estimate to generate an estimated driver torque signal, the estimated driver torque signal is applied in control of the power steering system, wherein the extended state vector approaches an actual state vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a power steering system, the method comprising:
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receiving at least an output vector; generating an error signal based on a difference of an estimated output vector and the output vector; calculating a feedback correction signal based on the error signal and an observer gain value, the feedback correction signal reducing the difference of the estimated output vector and the output vector by driving the error signal to approach zero; determining an extended state vector estimate based on the feedback correction signal and a motor torque command; and applying a gain to the extended state vector estimate to generate an estimated driver torque signal, the estimated driver torque signal assists in control of the power steering system, wherein the extended state vector approaches an actual state vector. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification