Steering Control Device Yaw Rate Peak Reduction
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Solution Overview
Problem
Existing steering control systems for vehicles with steer-by-wire technology face challenges in efficiently managing the relationship between steering and turning angles, leading to transient peaks in yaw rate response characteristics that affect vehicle responsiveness and stability.
Innovation Solution
A steering control device that calculates a speed increase ratio based on state variables to adjust the turning control amount, incorporating a static component calculation unit and phase compensation filters to manage the relationship between steering and turning angles, thereby controlling the yaw rate response characteristics and reducing transient peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a speed increase ratio is used to convert the steering angle to improve vehicle responsiveness, then the yaw rate response characteristics improve, but transient peaks appear that affect stability
Solution Approach 1:
A phase compensation filter is introduced as an intermediary component between the speed increase ratio calculation and the turning control amount application. This filter compensates for phase shifts caused by the speed increase ratio, allowing the system to maintain both improved responsiveness and stability without directly modifying the speed increase ratio itself
Solution Approach 2:
The system dynamically adjusts the phase compensation amount based on the calculated speed increase ratio and current vehicle state. By changing the compensation parameter adaptively, the system optimizes the balance between responsiveness and stability for different operating conditions
2Measurement precision
If the relationship between steering angle and turning angle is varied using map-based calculation to improve control precision, then steering accuracy improves, but the system complexity increases
Solution Approach 1:
The patent replaces complex map-based lookup tables with a mathematical calculation approach. The speed increase ratio is computed using a formula that considers vehicle speed and steering angle, eliminating the need for extensive pre-computed maps while maintaining or improving precision
Solution Approach 2:
The system uses dynamic parameter calculation based on real-time vehicle state (speed, steering angle) rather than static map-based values. This allows the steering ratio to adapt continuously to changing conditions without requiring complex lookup structures
Data Source
AI summary
A steering control device includes a control unit configured to perform a calculation based on angle information and to control the operation of a turning section based on a turning control amount. The angle information is obtained by relating the turning control amount for operating the turning section to a steering angle that is an angle by which a steering wheel is steered. The control unit includes a speed increase ratio calculation unit configured to calculate a speed increase ratio based on state variables, and an angle information calculation unit configured to calculate the angle information by converting the steering angle using the speed increase ratio obtained by the speed increase ratio calculation unit.