Vehicle Control Device Adaptive Lane Recognition Threshold
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Solution Overview
Problem
Existing vehicle control systems face challenges in transitioning from lane marking-based control to alternative modes, especially when lane markings are difficult to recognize due to fading, weather, or obstruction, leading to inadequate determination of control mode changes.
Innovation Solution
A vehicle control device and method that includes a preceding vehicle recognition unit, lane marking recognition unit, and traveling control unit, which perform first traveling control based on recognized lane markings and switch to second traveling control using a preceding vehicle's trajectory when lane markings are not recognizable, with the standard for recognition adjusted by vehicle speed and other conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lane marking recognition is used for traveling control, then the vehicle can maintain lane position accurately, but the control becomes unreliable when lane markings are faded, obscured, or difficult to recognize
Solution Approach 1:
The patent changes the recognition standard parameter dynamically based on vehicle speed. At higher speeds, the recognition standard is relaxed (allowing recognition at lower confidence levels), while at lower speeds, the standard is stricter. This parameter adaptation allows the system to maintain reliable control across varying operating conditions where lane marking visibility changes.
Solution Approach 2:
The system dynamically switches between different traveling control modes (lane marking-based control and alternative control) based on real-time recognition conditions. The traveling control unit adjusts the recognition standard according to vehicle speed and transitions control modes accordingly, making the system adaptive to changing environmental conditions rather than static.
2Measurement precision
If the recognition standard is made stricter to ensure accurate lane marking identification, then control accuracy improves, but the system cannot transition to alternative control modes even when lane markings are temporarily obscured
Solution Approach 1:
The patent implements variable recognition standards that change with vehicle speed. The recognition threshold is adjusted so that at higher speeds, the system accepts recognition at lower confidence levels, enabling smoother transitions to alternative control modes when lane markings are obscured. This prevents the system from being overly rigid while maintaining accuracy when conditions are good.
Solution Approach 2:
The system prepares for potential control mode transitions by continuously monitoring recognition standards and vehicle speed conditions. When the recognition standard becomes difficult to satisfy (due to speed or environmental factors), the system is already positioned to switch to alternative control modes without interruption, ensuring continuous reliable operation.
3Duration of action of stationary object
If the recognition standard is relaxed to maintain control when lane markings are difficult to recognize, then control continuity is improved, but false recognition may occur leading to incorrect control decisions
Solution Approach 1:
The patent uses vehicle speed as a key parameter to adjust the recognition standard. At higher speeds, the system relaxes the recognition standard to maintain control continuity, accepting that some uncertainty exists. At lower speeds, the stricter standard reduces the risk of false recognition. This speed-based parameter adjustment balances continuity and accuracy based on operational context.
Solution Approach 2:
The system dynamically adjusts the recognition standard based on real-time vehicle speed and recognition conditions rather than using a fixed threshold. This dynamic adaptation allows the system to maintain appropriate sensitivity across different operating conditions, preventing both excessive switching and false recognition.
4Reliability
If alternative control mode is used when lane marking recognition fails, then control reliability is maintained, but the transition timing may be inappropriate affecting driving smoothness
Solution Approach 1:
The patent uses vehicle speed as a dynamic parameter to determine the appropriate recognition standard and transition timing. By considering speed in the decision logic, the system ensures that transitions occur at appropriate moments rather than abruptly, improving driving smoothness while maintaining reliability. The speed-based parameter allows the system to anticipate when transitions should occur.
Solution Approach 2:
The system continuously monitors recognition conditions, vehicle speed, and control mode status, using this feedback to determine optimal transition timing. The traveling control unit adjusts the recognition standard based on current speed and recognition quality, creating a feedback loop that smooths transitions and prevents abrupt mode changes that would affect driving comfort.
Data Source
AI summary
A vehicle control device includes a preceding vehicle recognition unit which recognizes a preceding vehicle, a lane marking recognition unit which recognizes a lane marking for sectioning a lane in which a host vehicle travels, and a traveling control unit which performs first traveling control for causing the host vehicle to travel along a traveling route based on the lane marking recognized by the lane marking recognition unit in a case where the degree of recognition of the lane marking recognized by the lane marking recognition unit satisfies a predetermined standard, and performs second traveling control for causing the host vehicle to travel on the basis of a trajectory of the preceding vehicle recognized by the preceding vehicle recognition unit in a case where the degree of recognition of the lane marking recognized by the lane marking recognition unit does not satisfy the predetermined standard, and the traveling control unit changes the predetermined standard on the basis of a vehicle speed of the host vehicle.