Steer-By-Wire Actuator Control for Road-Rut Escape
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Solution Overview
Problem
Existing steer-by-wire vehicle steering systems restrict wheel movement when an overload condition is detected, making it difficult to maneuver out of ruts or grooves in the road surface.
Innovation Solution
A vehicle steering system with an output restriction mechanism that includes sensors to detect steering angle and torque, a control unit to manage actuator output, and a detection unit to cancel output restriction upon specific operator inputs, allowing the wheel to be steered out of ruts or grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output restriction control is activated to protect the steering mechanism from mechanical damages, then the steering actuator output is limited, but the wheel cannot be steered out of ruts or grooves
Solution Approach 1:
The system dynamically adjusts the output restriction level based on detected operator input patterns. When continuous steering input exceeding a threshold is detected, the system cancels the output restriction control, allowing full actuator output to steer the wheel out of ruts or grooves. This dynamic adjustment resolves the contradiction by making the restriction adaptive rather than static.
Solution Approach 2:
The control unit changes the output parameter of the steering actuator based on the detected operation pattern. When the threshold-based continuous input condition is met, the system transitions from a restricted output state to an unrestricted output state, enabling the wheel to be steered out of difficult situations while maintaining protection during normal operation.
2Loss of energy
If output restriction control is activated to avoid excessive power consumption, then the electric current to the steering actuator is limited, but the operator cannot apply sufficient force to move the wheel from obstacles
Solution Approach 1:
The system dynamically switches between power-saving mode and force-mode based on detected operator input patterns. When continuous steering input exceeding the threshold is detected, the system cancels output restriction, allowing full electric current to flow to the actuator to generate the necessary force to move the wheel from obstacles.
Solution Approach 2:
The control unit changes the electrical parameter (current supply) to the steering actuator based on the detected operation pattern. During normal operation, current is restricted to save energy; when the threshold-based continuous input condition is met, current restriction is canceled to provide sufficient steering force.
Data Source
AI summary
The vehicle steering control system includes a control unit configured to control the steering actuator to achieve the steered angle based on at least one of the steering angle and the steering torque. The control unit executes an output restriction control to restrict an output of the steering actuator when a steering torque is equal to or greater than a prescribed threshold value, and cancels the output restriction control when the detection unit has detected a prescribed mode of operation by the operator while the output restriction control is being executed.