Lane Keeping Assist Override Threshold Dynamics
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Solution Overview
Problem
Drivers experience discomfort when directly changing lanes due to delayed cancellation of lane keeping control, and frequent cancellations occur when criteria for override are lowered after a turn signal is input.
Innovation Solution
A lane keeping assist method that determines the state of a lane change by analyzing the error between the vehicle's driving path and a target path, adjusting the criterion for driver override based on this state, and comparing the driver's steering torque with adjusted thresholds to rapidly activate or cancel the override, thereby minimizing discomfort during lane changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the criteria for driver override are maintained to be the same after turn signal input, then the lane keeping control stability is improved, but the driver comfort deteriorates due to delayed lane keeping cancellation
Solution Approach 1:
The patent applies dynamics by making the override criterion threshold variable rather than fixed. The threshold dynamically adjusts based on the turn signal state: using a first threshold when turn signal is not input, and a second (lower) threshold when turn signal is input. This dynamic adjustment allows the system to maintain stability during normal operation while improving responsiveness and comfort during intended lane changes.
Solution Approach 2:
The patent changes the parameter of the override criterion threshold based on the turn signal input state. By switching between different threshold values (first threshold vs. second threshold) depending on whether the turn signal is active, the system resolves the contradiction between maintaining stability and improving driver comfort during lane change operations.
2Ease of operation
If the criteria for override are lowered immediately after the input of the turn signal, then the driver comfort is improved, but the lane keeping cancellation occurs frequently
Solution Approach 1:
The system dynamically adjusts the override criterion threshold based on the turn signal state. Instead of immediately lowering the threshold, the system maintains the first (higher) threshold until the turn signal condition is met, then switches to the second (lower) threshold. This dynamic behavior prevents frequent false cancellations while still improving comfort when lane change is intended.
Solution Approach 2:
The patent changes the threshold parameter conditionally based on turn signal input. By establishing different threshold values for different operational states (turn signal off vs. turn signal on), the system avoids frequent lane keeping cancellations while improving driver comfort during actual lane change maneuvers.
3Measurement precision
If the criterion for driver override is adjusted based on error between driving path and target path, then the lane change detection accuracy is improved, but the system complexity increases
Solution Approach 1:
The patent applies local quality by adjusting the override criterion threshold based on the specific operational context (turn signal state and error magnitude). Instead of using a uniform threshold throughout all operating conditions, the system applies different threshold values locally depending on whether the turn signal is active and what the error magnitude is, thereby improving detection accuracy without requiring a completely complex system redesign.
Data Source
AI summary
A lane keeping assist method and system may include determining a driving state of a vehicle according to a state of a lane change in which an intention of a driver is reflected after a turn signal is applied, adjusting a criterion for driver override depending on an error between a driving path of the vehicle and a target path according to the driving state of the vehicle, comparing a steering torque of the driver with the adjusted criterion to determine activation or cancellation of the driver override, minimizing the driver's discomfort in the steering operation when the driver intentionally changes the lane.