EPS Steering Control With Variable Damping and High-Frequency Assist
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Solution Overview
Problem
Conventional EPS control systems face challenges in achieving both improved steering feel and stability due to complex interconnections between influencing factors.
Innovation Solution
An EPS control method and device that adjusts damping gain based on steering angular velocity, divided into three sections, and adjusts high frequency assist gain to enhance steering feel and stability by considering the complex relationship between these factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional EPS control systems use fixed damping gain, then system stability is maintained, but steering feel is not optimized across different steering conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed damping gain to a variable damping gain that changes based on steering angular velocity. The control system dynamically adjusts the damping gain in different sections (first, second, third) according to the detected steering angular velocity, allowing the system to adapt to different steering conditions while maintaining stability.
Solution Approach 2:
The patent changes the parameter of damping gain from a constant value to a variable value that depends on steering angular velocity. By dividing the steering angular velocity range into three sections and assigning different damping gain values to each section, the system optimizes steering feel across different operating conditions without compromising stability.
2Stability of the object's composition
If damping gain is increased to improve steering stability, then steering stability is improved, but steering responsiveness deteriorates
Solution Approach 1:
The patent applies local quality by assigning different damping gain values to different sections of steering angular velocity. In the first section (low angular velocity), higher damping gain is applied for stability. In the second and third sections (higher angular velocity), lower damping gain is applied for responsiveness. This localized differentiation resolves the contradiction between stability and responsiveness.
Solution Approach 2:
The system dynamically adjusts damping gain based on real-time detection of steering angular velocity. When angular velocity is low, the system increases damping gain for stability. When angular velocity increases, the system decreases damping gain to maintain responsiveness. This dynamic adaptation allows the system to optimize both stability and responsiveness as needed.
3Ease of operation
If high frequency assist gain is increased to improve steering feel, then steering feel is improved, but steering stability deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the control strategy for high frequency assist gain across different steering conditions. The system adjusts high frequency assist gain based on the detected steering angular velocity and the current section, allowing optimized steering feel in certain conditions while maintaining stability in others. This localized differentiation resolves the contradiction between steering feel and stability.
Solution Approach 2:
The system changes the parameter of high frequency assist gain from a fixed value to a variable value that depends on steering angular velocity and the current section. By dynamically adjusting this parameter based on real-time detection, the system optimizes steering feel when needed while preventing instability, thus resolving the contradiction between these two requirements.
Data Source
AI summary
An EPS control device for improving steering performance according to one embodiment of the disclosed invention, comprises a sensing module for sensing information relating to a traveling speed of a vehicle and input information from a driver relating to steering of a steering wheel; a main assist module for controlling a driving part of said vehicle based on the information sensed by said sensing module, a high-frequency assist module for adjusting a high-frequency assist gain based on input information from a driver regarding steering of said steering wheel, and a damping control module for adjusting a damping gain that acts as a resistance to movement of said steering wheel based on input information from a driver regarding steering of said steering wheel.