Vehicle Driving Control for Icy Road Override Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing automated lane keeping systems fail to effectively manage vehicle behavior when encountering icy roads, leading to potential skidding or spinouts due to driver interventions during operation takeover requests.
Innovation Solution
A driving control apparatus that includes an environmental condition estimating part for detecting icy roads, adjusting override threshold values based on time to arrival and road conditions, and implementing risk minimization control to decelerate the vehicle to a stop, suppressing driver overrides during icy road encounters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the override threshold value is set to a normal value, then the driver can easily take over control when needed, but the driver's operation intervention may induce vehicle skidding or spinout on icy roads
Solution Approach 1:
The override threshold value is made dynamic rather than static. The system automatically adjusts the threshold based on detected road conditions (icy vs. normal). When icy road conditions are detected, the threshold is increased to suppress driver interventions that could cause skidding. When normal conditions prevail, the threshold returns to normal levels, allowing easy driver takeover. This dynamic adjustment resolves the contradiction by adapting the ease of operation to current safety requirements.
Solution Approach 2:
The system changes the parameter of the override threshold value based on environmental conditions. By detecting icy road surfaces and adjusting the threshold parameter upward, the system prevents driver operations from inducing vehicle instability. The parameter change is contextual and reversible, maintaining normal operation characteristics when conditions permit while ensuring safety when icy conditions are present.
2Reliability
If the override threshold value is set to a greater-than-normal value, then vehicle stability is maintained on icy roads, but the driver's ability to take over control is reduced
Solution Approach 1:
The system dynamically adjusts the override threshold based on real-time road condition detection. The threshold is not permanently elevated but temporarily increased only when icy conditions are detected. This allows the system to maintain vehicle stability during critical periods while preserving normal driver control capabilities when conditions are safe, thus resolving the contradiction between stability and ease of operation.
Solution Approach 2:
The system performs preliminary detection of road conditions and proactively adjusts the override threshold before driver intervention becomes problematic. By detecting icy surfaces in advance and preemptively raising the threshold, the system prevents potential skidding events while maintaining normal operational characteristics once the vehicle has safely navigated the hazardous section.
3Reliability
If risk minimization control is performed on icy roads, then vehicle skidding and spinout are prevented, but the automated driving function must be stopped
Solution Approach 1:
The system applies preliminary anti-action by detecting icy road conditions and preemptively adjusting the override threshold to suppress driver interventions that could trigger unstable vehicle behavior. This preventive measure stops skidding before it occurs by anticipating the interaction between driver input and low-traction surfaces, allowing automated driving to continue safely without requiring function cessation.
Solution Approach 2:
The adjusted override threshold acts as an intermediary mechanism between the driver's control inputs and the vehicle's response on icy surfaces. By filtering or dampening driver interventions through the elevated threshold, the system mediates the interaction to prevent destabilizing effects while maintaining the automated driving function's operational status.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
[Problem to be Solved] To enable shifting to safety measures appropriately when an icy road is detected, in accordance with the time when the icy road spot is reached. [Solution] A function that performs in-lane automated driving, a function that performs automated lane change, an MRM function that executes a risk minimization control when operation is not taken over by a driver when a system failure occurs, an EM function that executes an emergency avoidance control if a collision with another vehicle is predicted, and an override function that, if there is an operation intervention equal to or greater than a prescribed threshold value by the driver while each function is active, stops the active function and transfers authority to the driver are included, wherein if an icy road on a driving path ahead of the vehicle is detected and the time to arrival at an icy road spot is less than a prescribed value, the prescribed threshold value which serves as a determination criterion for the operation intervention is set to a greater-than-normal value and the risk minimization control is performed.