Steering Control Device for Moving Body Failure Response
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Solution Overview
Problem
Existing steering control systems fail to maintain the traveling direction of a moving body when a failure occurs, particularly when the automatic steering mechanism becomes abnormal, leading to difficulties in navigating curved paths.
Innovation Solution
A moving body equipped with a steering control device that selectively performs a first steering control based on movement status and a second steering control, such as rudder angle maintenance control or torque maintenance control, to limit steering when a failure related to the first steering control occurs, ensuring the steering state is maintained before the failure, allowing the vehicle to continue on its course without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resistance force is applied to the steering force transmission mechanism when automatic steering becomes abnormal, then the actuator drive is stopped and steering control is limited, but the moving body cannot move along the course when traveling in an arcuate course
Solution Approach 1:
The steering control device dynamically switches between normal automatic steering control and abnormality countermeasures based on the detected failure state. When abnormality is detected, the system transitions to a state where the actuator is deactivated and resistance force is applied, but maintains the ability to preserve curved path travel by limiting rather than completely blocking steering adjustments
Solution Approach 2:
The system changes the steering control parameters from active actuator drive to resistance force application with limited steering adjustment. The resistance force magnitude and steering limitation level are adjusted based on the detected abnormality, allowing the vehicle to maintain stability while preserving the capability to follow curved paths
2Reliability
If the actuator drive is shut off when abnormality is detected, then steering control safety is improved, but the moving body loses the ability to maintain traveling direction in curved paths
Solution Approach 1:
The system prepares compensatory measures in advance by detecting abnormalities early and transitioning to a resistance force application mode that cushions the impact of actuator failure. This gradual transition preserves traveling direction stability by maintaining controlled resistance rather than abrupt steering loss
Solution Approach 2:
The resistance force applying mechanism serves as an intermediary between the failed actuator and the steering force transmission mechanism. It provides controlled resistance that maintains steering stability and preserves the ability to follow curved paths while the actuator remains deactivated
Data Source
AI summary
A moving body having a steering device and a steering control device which controls the steering device to control steering of the moving body. The steering control device selectively performs a first steering control which controls the steering of the moving body based on a movement status of the moving body and a second steering control which limits the steering of the moving body. The steering control device performs the second steering control based on a steering state of the moving body by the first steering control before occurrence of a failure when the failure related to execution of the first steering control occurs in a state where the first steering control is performed.