Steering Reaction Force Control Under Shaft-Wheel Decoupling
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Solution Overview
Problem
Existing steering control systems face instability when power transmission between the steering shaft and turning wheels is cut off, as arbitrary setting of steering system characteristics can impair the stabilizing effect of phase compensation processes.
Innovation Solution
A steering control device that includes a processor to execute reaction force setting, application, and adjustment processes, utilizing phase compensation and reaction force adjustment to stabilize the steering system by changing phase compensation and reaction force variables based on road surface information and hysteresis, damping, and steering return processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power transmission between steering shaft and turning wheels is cut off, then steering system characteristics can be arbitrarily adjusted through control, but the stabilizing effect of phase compensation process is impaired
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the phase compensation amount based on the steering reaction force settings. When power transmission is cut off, the control device modifies the phase compensation parameter in response to changes in steering reaction force, ensuring that the stabilizing effect is maintained while allowing flexible adjustment of steering system characteristics. This resolves the contradiction by making the phase compensation adaptive rather than fixed.
Solution Approach 2:
The patent implements feedback by using the steering reaction force as a feedback signal to adjust the phase compensation process. The control device continuously monitors the steering reaction force and uses this information to modify the phase compensation amount, creating a closed-loop control system that maintains stability while enabling characteristic adjustment.
2Ease of operation
If phase compensation process is executed separately from reaction force adjustment process, then control flexibility is improved, but system stability may be compromised
Solution Approach 1:
The patent applies dynamics by making the phase compensation process dynamic rather than static. The phase compensation amount is continuously adjusted based on real-time steering reaction force measurements, allowing the system to adapt to changing conditions while maintaining stability. This dynamic approach resolves the contradiction by enabling flexible control without compromising stability.
Solution Approach 2:
The patent implements preliminary action by performing phase compensation before the steering reaction force is fully established. The control device anticipates changes in steering reaction force and adjusts phase compensation in advance, preventing instability while maintaining control flexibility.
Data Source
AI summary
A steering control device includes a processor that controls, as a target, a steering system including a reaction force motor that applies a steering reaction force to a steering shaft and a turning motor that turns a turning wheel in a state where power transmission from the steering shaft is cut off. The processor executes a reaction force setting process, a reaction force application process, and an interlocking process. The reaction force setting process is a process of setting the steering reaction force, and the reaction force application process is a process of operating the reaction force motor. A reaction force adjustment process is a process of adjusting the steering reaction force, and a phase compensation process is a process of performing phase compensation of the steering reaction force separately from the reaction force adjustment process.