Steering Control Device for Safe Manual Takeover on Curved Roads
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Solution Overview
Problem
Existing vehicles with advanced steering control systems face challenges in safely shifting to manual steering when a failure occurs, particularly on curved roads, as immediate shutdown of the Lane Keeping Assist (LKA) function can lead to unsafe navigation.
Innovation Solution
A moving body equipped with a steering system and a control device that executes first and second steering controls based on its state, allowing safe transition to manual steering by maintaining the steering angle or torque when a failure is detected, and ending these controls when a threshold is exceeded, enabling smooth driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LKA function is immediately stopped when a failure occurs, then the system responds quickly to the failure, but the vehicle cannot move safely along curved roads
Solution Approach 1:
The patent applies dynamics by making the steering control mode switchable between automated LKA control and manual steering control based on failure conditions. The system dynamically transitions from automatic control to manual control when failures are detected, allowing the vehicle to maintain operational capability on curved roads while ensuring safety through driver intervention.
Solution Approach 2:
The patent implements preliminary action by notifying the driver in advance when a failure occurs and requiring driver intervention before completely disengaging LKA control. This preliminary notification and threshold-based intervention mechanism ensures the driver is prepared to take control, maintaining safety while allowing smooth transition on curved roads.
2Reliability
If the LKA function is immediately stopped when a failure occurs, then the system ensures safety by halting automated control, but the vehicle loses the ability to maintain traveling direction on curved roads
Solution Approach 1:
The patent applies preliminary action by notifying the driver in advance of the failure condition and requiring the steering operation amount to exceed a threshold before completely ending LKA control. This preliminary notification mechanism maintains traveling direction stability by keeping LKA control active during the transition period, while ensuring safety through driver awareness and eventual intervention.
3Ease of operation
If the steering control is ended when operation amount exceeds a threshold, then the driver can take over manual control, but the transition may cause disturbances if not properly managed
Solution Approach 1:
The patent applies preliminary anti-action by notifying the driver in advance of the failure condition before completely ending LKA control. This preliminary notification prevents sudden disturbances by preparing the driver for the transition, while the threshold-based intervention mechanism ensures smooth takeover of manual steering control without abrupt changes in steering behavior.
Data Source
AI summary
A moving body includes: a steering system configured to change steering of the moving body; and a steering control device configured to control the steering of the moving body by controlling the steering system. The steering control device selectively executes first steering control for controlling the steering of the moving body and second steering control for restricting the steering of the moving body, executes the second steering control when a failure related to execution of the first steering control occurs, ends the first steering control when an operation amount of the operation member exceeds a first threshold value in the state where the first steering control is being executed, and ends the second steering control when an operation amount of the operation member exceeds a second threshold value smaller than the first threshold value in a state where the second steering control is being executed.