Lane Keeping Assist Controller Mode Transition for Actuator Abnormalities
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Solution Overview
Problem
Existing lane keeping assist systems require redundant sensors, increasing costs and do not address abnormalities in steering control actuators or brake mechanisms when the magnetic nail sensor is operational.
Innovation Solution
A lane keeping assist apparatus that includes a lane detecting part, an information output device, and an actuator, with a controller that performs alert and intervention controls based on the vehicle's position relative to the lane, and selectively operates in different modes based on abnormality determinations to maintain partial functionality even if other relevant parts experience abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two types of lane detecting parts (magnetic nail sensor and CCD camera) are used to ensure redundancy, then reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the operational parameters of the single lane detecting part by implementing multiple operation modes (first mode with both alert and intervention controls, second mode with only alert control, third mode with neither control) based on abnormality determination results. This allows the system to adapt its functionality to different operational conditions, effectively providing redundancy through operational flexibility rather than hardware duplication.
2Reliability
If the system requires both alert control and intervention control to be fully functional, then reliability is improved, but the system becomes vulnerable to complete failure when any related part experiences abnormality
Solution Approach 1:
The patent implements dynamic operation modes that allow the system to transition between different functional states based on real-time abnormality determination. The controller dynamically adjusts which controls (alert or intervention) remain operational, enabling the system to maintain partial functionality under various abnormal conditions rather than requiring all components to be fully functional at all times.
Solution Approach 2:
The patent allows the system to operate with partial functionality by permitting alert control to continue operating even when intervention control is suppressed due to abnormalities. This partial action approach ensures that warning functions remain active to alert drivers, providing a safety net even when active intervention is not available.
3Reliability
If the system suppresses both alert and intervention controls when abnormalities are detected, then safety is improved by preventing malfunction, but productivity and assist function are reduced
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different control functions based on their respective abnormality statuses. Instead of uniformly suppressing all controls when any abnormality is detected, the system selectively maintains alert control functionality when only intervention-related parts are abnormal, while suppressing both controls only when necessary. This localized approach preserves assist function availability wherever safety permits.
Data Source
AI summary
A lane keeping assist apparatus is disclosed which includes a lane detecting part; an information output device; an actuator that generates a force for changing an orientation of a vehicle; and a controller that performs a lane keeping assist control based on a positional relationship between the lane and the vehicle, wherein the lane keeping assist control includes an alert control and an intervention control via the actuator, the controller selectively operates in a first mode where the alert control and the intervention control are executable, a second mode where only the intervention control is suppressed or a third mode where the alert control and the intervention control are suppressed, and the controller, during operating in the first mode, performs a mode transition to the second mode when the abnormality determination results indicate an abnormal state concerning only the part related to the intervention control.