Steering Reaction Force Control With Adaptive Phase Compensation
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Solution Overview
Problem
Existing steering control systems face challenges in maintaining system stability when arbitrarily adjusting steering characteristics without power transmission, as phase compensation processing may be impaired.
Innovation Solution
A steering control device that includes a processor to execute reaction force setting, phase compensation, and axial force gradient calculation processing, allowing for dynamic adjustment of steering reaction forces and assist amounts based on axial force gradients, thereby ensuring appropriate phase compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If arbitrary settings are made to adjust steering system characteristics when power transmission is cut off, then the degree of freedom in adjusting characteristics is improved, but the stabilization effect of phase compensation processing deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the phase compensation regulation variable based on the axial force gradient. Instead of using arbitrary fixed settings, the system calculates the axial force gradient and uses it to determine the appropriate phase compensation parameter, thereby maintaining stability while adapting to different operating conditions. This resolves the contradiction by replacing arbitrary parameter selection with a calculated, adaptive parameter adjustment mechanism.
Solution Approach 2:
The patent implements feedback by using the calculated axial force gradient to regulate the phase compensation variable. The system continuously monitors the axial force gradient and adjusts the phase compensation accordingly, creating a closed-loop control mechanism. This feedback approach ensures that characteristic adjustments do not compromise system stability, as the phase compensation is continuously optimized based on real-time system state.
2Reliability
If phase compensation processing is applied to stabilize the steering system, then system stability is improved, but the ability to arbitrarily adjust steering characteristics deteriorates
Solution Approach 1:
The patent applies dynamics by making the phase compensation variable dynamic rather than fixed. The phase compensation regulation variable is continuously adjusted based on the axial force gradient, allowing the system to adapt its characteristics in real-time. This dynamic approach enables the system to maintain stability through phase compensation while simultaneously adjusting steering characteristics according to operating conditions, resolving the contradiction between stability and adaptability.
Solution Approach 2:
The patent changes parameters by using the axial force gradient to determine the phase compensation regulation variable. Instead of applying fixed phase compensation, the system calculates the appropriate parameter based on the current axial force gradient, enabling both stability maintenance and characteristic adjustment. This parameter change approach allows the system to optimize both stability and adaptability simultaneously.
3Speed
If the axial force gradient is increased to improve steering response, then steering assistance performance is improved, but the effectiveness of phase compensation processing deteriorates
Solution Approach 1:
The patent uses feedback to continuously adjust the phase compensation regulation variable based on the axial force gradient. When the axial force gradient increases to improve steering response, the system automatically adjusts the phase compensation parameter to maintain effectiveness. This feedback mechanism ensures that phase compensation remains effective across different axial force gradient levels, resolving the contradiction between steering response speed and phase compensation effectiveness.
Solution Approach 2:
The patent applies parameter changes by adjusting the phase compensation regulation variable according to the axial force gradient magnitude. When axial force gradient is high (indicating fast steering response), the system modifies the phase compensation parameter to maintain stability. This dynamic parameter adjustment allows the system to achieve both high steering response speed and effective phase compensation simultaneously.
Data Source
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AI summary
A processor (52) is configured to execute reaction force setting processing, reaction force application processing, axial force gradient calculation processing, and interlock processing. The reaction force setting processing is processing of setting steering reaction force using phase compensation processing. The reaction force application processing is processing of operating a reaction force motor (22) with reaction force set by the reaction force setting processing as input. The axial force gradient calculation processing is processing for calculating an axial force gradient as a variable indicating the ratio of the change in resisting force against rotation of the steering shaft (14) to the change in rotation angle of the steering shaft (14). The interlocking processing is processing of changing one of both the value of a phase compensation regulation variable as a variable for regulating a manner of the phase compensation and the axial force gradient according to the other.