Steer-By-Wire Steering Control for Guide Display Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In steer-by-wire steering systems, the independent control of turning wheels without dynamic power transmission from the steering wheel can cause a strangeness feeling for drivers due to unexpected guide displays based on altered turning angles, which are not directly related to the steering wheel input.
Innovation Solution
A steering control device with a first processing unit that alters the target angle independently of the steering wheel state and a second processing unit that calculates a turning state amount to reduce the influence of these alterations, ensuring guide displays align with the actual steering wheel state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control device executes a control for purposely altering the turning angle independently of the steering state of the steering wheel, then the steering device convenience or product specification is improved, but the driver may have a strangeness feeling due to guide display reflecting the altered turning angle
Solution Approach 1:
The patent divides the turning angle into two separate components: a steering wheel-based turning angle and an independently controlled turning angle. The guide display uses only the steering wheel-based turning angle, while the independently controlled turning angle is applied separately through the turning motor. This segmentation allows the guide display to remain consistent with driver expectations while still enabling enhanced steering control functionality.
Solution Approach 2:
The patent introduces an intermediary processing unit that calculates the turning angle based on the steering wheel state and separates it from the independently controlled turning angle. This intermediary ensures that the guide display reflects only the steering wheel input, acting as a mediator between the driver's steering input and the actual turning wheel movement, thereby preventing driver confusion.
2Ease of operation
If the guide monitor display is based on the turning state of the turning wheels, then the traveling assistance is improved, but the display may not align with the driver's steering wheel input causing confusion
Solution Approach 1:
The patent applies different quality characteristics to different parts of the system: the guide display uses the steering wheel-based turning angle to maintain alignment with driver input, while the turning motor control uses the full turning angle including independent adjustments. This local differentiation ensures that the display information remains consistent with driver expectations while the actual turning operation benefits from enhanced control.
Data Source
AI summary
A steering control device calculates a target angle of a shaft that rotates in conjunction with a turning operation of a turning wheel that is isolated from dynamic power transmission with a steering wheel, depending on a steering state of the steering wheel, and executes a feedback control to cause an actual angle to follow the target angle, for controlling electricity supply to a turning motor to turn the turning wheel, the steering control device including: a first processing unit to execute a process to alter the target angle independently of the steering state of the steering wheel; and a second processing unit to calculate a turning state amount for a guide monitor function to assist traveling of a vehicle, by reducing or removing an influence of an alteration of the target angle on the actual angle of the shaft.