Steer-by-Wire Phase Shift Correction via Speed-Dependent Feedback
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Solution Overview
Problem
Existing vehicle steering devices of the steer-by-wire type do not effectively inhibit specific phase shifts that cause a strange feeling for drivers, which can interfere with driving, especially when the phase shift is based on its type and magnitude.
Innovation Solution
A vehicle steering device with a steering section, turning section, control section, and vehicle speed detection system that corrects the turning angle of steered wheels to match the steering angle when a specific phase shift occurs, using a turning actuator and clutch mechanism to manage the mechanical connection between the steering and turning systems, and inhibiting phase shifts by adjusting the turning angle based on vehicle speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the turning angle of steered wheels is corrected to match the steering angle when phase shift occurs, then the correspondence relationship between steering angle and turning angle is improved, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The determination section continuously monitors the correspondence relationship between steering angle (from steering angle detection section) and turning angle (from turning angle detection section). When a phase shift is detected, the control section activates the turning actuator to correct the turning angle, creating a closed-loop feedback system that automatically resolves phase shifts without increasing overall device complexity
Solution Approach 2:
The system performs self-correction by using its own detection and control components to identify and resolve phase shifts. The determination section detects the phase shift, and the control section automatically adjusts the turning angle via the turning actuator, enabling the system to self-correct without external intervention
2Reliability
If the turning actuator is activated to correct phase shift, then the turning angle alignment is improved, but the energy consumption increases
Solution Approach 1:
The system performs periodic monitoring of the correspondence relationship between steering angle and turning angle through the determination section. Correction actions are activated only when phase shift is detected, rather than continuous operation, thereby reducing energy consumption while maintaining reliable turning angle alignment
Solution Approach 2:
The determination section continuously monitors the correspondence relationship and detects phase shifts before they significantly degrade steering performance. By detecting and correcting phase shifts in advance, the system maintains alignment reliability while minimizing the duration and frequency of actuator activation, thus reducing energy consumption
Data Source
AI summary
A vehicle steering device includes: steering reaction force generation device having a steering wheel and a steering reaction force motor; steering reaction force motor resolver for detecting steering angle; turning device having a steering motor and capable of turning steered wheels, in a state being mechanically disconnected from the steering reaction force generation device; steering motor resolver for detecting turning angle; drive control section for performing drive control of the steering motor; and vehicle speed sensor for detecting the vehicle speed of vehicle. The drive control section performs drive control of the steering motor if vehicle speed exceeds vehicle speed threshold for the first time after ignition switch is turned on and if specific phase shift based on type and magnitude of phase shift occurs.