Steering Torque Feedback Control with Adaptive Response Characteristics
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Solution Overview
Problem
Existing steering control systems face challenges in balancing stability and responsiveness of feedback control on steering torque.
Innovation Solution
A steering control device and method that includes a torque feedback process, operation process, and characteristic change process, utilizing a motor mechanically connected to an operation member to control steering torque, with processes to adjust response characteristics based on plant state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is performed on steering torque to control it to a target value, then steering accuracy is improved, but stability and responsiveness cannot be balanced
Solution Approach 1:
The patent applies dynamics by making the feedback control characteristics variable rather than fixed. The controller dynamically adjusts control parameters based on the operational state of the steering system, allowing the system to adapt its response characteristics in real-time. This enables the system to maintain both accuracy and stability across different operating conditions by shifting control characteristics as needed.
Solution Approach 2:
The patent implements parameter changes by modifying the feedback control parameters according to plant state. The controller changes control characteristics such as gain factors or response rates based on the current state of the steering system, enabling optimization of both stability and responsiveness. This parameter adaptation allows the system to resolve the contradiction between maintaining stable control and achieving rapid response.
2Measurement precision
If feedback control is performed on steering torque, then steering accuracy is improved, but responsiveness and stability cannot be balanced simultaneously
Solution Approach 1:
The system dynamically adjusts its response characteristics based on operational state. The controller makes the feedback gain variable, allowing it to increase responsiveness when needed while maintaining stability during normal operation. This dynamic adaptation enables the system to achieve both fast response and stable control without fixed parameter limitations.
Solution Approach 2:
The patent changes control parameters such as proportional gain or integral gain based on plant state to optimize the balance between response speed and stability. By adjusting these parameters dynamically, the system can achieve rapid response when accuracy is critical while maintaining stability during steady-state operation, thus resolving the contradiction between speed and stability.
Data Source
AI summary
A steering control device operates a motor mechanically connected to an operation member. The motor is a drive source for a plant mounted on a vehicle. The steering control device performs a torque feedback process, an operation process, and a characteristic change process. The torque feedback process includes a process of calculating a manipulated variable for controlling steering torque to target steering torque. The operation process is a process of operating a drive circuit for the motor based on the manipulated variable. The characteristic change process is a process of changing a response characteristic of feedback control according to a plant state of the plant.