DEVICE AND METHOD OF CONTROLLING STEERING SYSTEM MOUNTED IN VEHICLES
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United States of America Patent
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Jun 29, 2017
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Jul 5, 2016
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Abstract
A steering control device controls an assist torque to be outputted by a motor connected to a steering system mechanism generating a steering torque. A response compensation filter performs a filter process compensating for a response in a specific frequency band with respect to a target steering torque generated by a target generation unit, and outputs a response-compensated target steering torque (Ts**). A servo controller calculates an assist torque command value (Ta*) in order for a torque deviation (ΔTs), which is a difference between the steering torque (Ts) and the response-compensated target steering torque (Ts**), to become zero. A transfer characteristic of the response compensation filter is set to suppress a mechanical resonance frequency band where a gain due to resonance of the steering system mechanism becomes large.
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