Steering Assist Control Abnormality Response Rates
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Solution Overview
Problem
Existing steering assist control systems fail to adequately adjust the steering control variable in response to different types of recognition abnormalities, leading to inappropriate steering control, especially when lane line detection is unreliable or unstable.
Innovation Solution
A steering assist control apparatus that includes a lane recognition unit, an abnormality detection unit, and a control stop unit, which detects the manner of recognition abnormalities and adjusts the steering control variable at specific rates to address the type of abnormality, such as decreasing the variable more rapidly for unstable lane line detection or incorrect lane recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steering control torque is gradually decreased when lane recognition becomes undetectable, then the behavior change of the own vehicle can be suppressed, but the steering assist control is stopped regardless of the manner of the recognition abnormality, leading to inadequate response to different abnormality types
Solution Approach 1:
The patent applies local quality by differentiating the response strategy based on the specific type of recognition abnormality detected. The control unit identifies whether the abnormality is temporary (e.g., partial lane line absence) or persistent (e.g., continuous undetectable state) and applies different manipulated variable decrease rates accordingly. This allows the system to maintain appropriate steering assist control for temporary abnormalities while safely reducing control for persistent ones, rather than using a uniform response for all abnormality types.
Solution Approach 2:
The patent implements dynamics by making the manipulated variable decrease rate adjustable based on the detected abnormality manner. The control unit dynamically selects between different decrease rates (first decrease rate for temporary abnormalities, second decrease rate for persistent abnormalities) rather than using a fixed gradual decrease strategy. This dynamic adaptation enables the system to respond appropriately to varying abnormality conditions while maintaining vehicle stability.
2Stability of the object's composition
If the manipulated variable is decreased to zero over a relatively long time for temporary recognition abnormalities, then the abnormality dissolution is accommodated, but the response time is extended which may be inappropriate for more severe abnormalities
Solution Approach 1:
The patent applies parameter changes by modifying the manipulated variable decrease rate parameter based on the detected abnormality type. For temporary abnormalities, a first (slower) decrease rate is used to maintain stability and allow for potential abnormality dissolution. For persistent abnormalities, a second (faster) decrease rate is used to reduce control more quickly. This parameter adaptation resolves the contradiction between maintaining stability and responding promptly to different abnormality severities.
3Adaptability or versatility
If the manipulated variable is decreased in a relatively short time for false lane line detection, then the steering control is corrected quickly, but the vehicle behavior may become unstable due to rapid control changes
Solution Approach 1:
The patent applies local quality by implementing different decrease rate strategies for different locations in the abnormality detection space. For false lane line detection (a specific type of recognition abnormality), the system identifies this as a persistent abnormality and applies the second (faster) decrease rate to correct the steering control quickly. However, the control unit manages this rapid decrease to prevent excessive vehicle behavior changes, balancing correction speed with stability maintenance.
Data Source
AI summary
In a steering assist control apparatus including a steering assist control unit that controls the steering of an own vehicle by a manipulated variable allowing the own vehicle to run along a lane recognized by a lane recognition unit, and a control stop unit that decrease the manipulated variable with time when an abnormality detection unit detects a recognition abnormality in the lane recognition unit, the control stop unit decreases the manipulated variable at a manipulated variable decrease rate corresponding to a manner of the recognition abnormality. Thereby, at the time of the occurrence of the abnormality, it is possible to more adequately decrease the manipulated variable for the steering assist control, corresponding to the manner of the abnormality.