Collision Avoidance Steering Using Turn Signal Direction Cues
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Solution Overview
Problem
Conventional collision avoidance support systems may cause unnecessary steering maneuvers or increased risk of collision when a frontward vehicle's turn indicators indicate a different direction than the planned collision avoidance path, leading to discomfort for the host vehicle's driver.
Innovation Solution
The system employs a surroundings monitoring sensor to obtain image data and determine the indicated direction of a frontward vehicle's turn indicators. Based on this information, the control unit adjusts the collision avoidance steering control start conditions to prevent excessive lateral movement of the host vehicle and avoid unnecessary steering maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collision avoidance steering control is started early to prevent collision with frontward vehicle, then collision avoidance capability is improved, but driver discomfort increases due to excessive lateral movement when frontward vehicle turns in opposite direction
Solution Approach 1:
The system performs preliminary analysis of the frontward vehicle's turn indicator state before initiating collision avoidance steering control. By detecting the indicated direction in advance and comparing it with the planned collision avoidance direction, the system determines whether to adjust the control start timing, thereby preventing unnecessary early steering actions that would cause driver discomfort
Solution Approach 2:
The system dynamically adjusts the collision avoidance steering control start conditions based on the frontward vehicle's indicated direction. When the indicated direction differs from the planned collision avoidance direction, the system modifies the start conditions to delay control initiation, making the system's response adaptive to the actual traffic situation rather than following a fixed threshold
2Ease of operation
If collision avoidance steering control is delayed to avoid unnecessary steering when frontward vehicle turns away, then driver comfort is improved, but collision risk increases when frontward vehicle turns in same direction
Solution Approach 1:
The system continuously monitors the frontward vehicle's turn indicator state and uses this feedback to adjust collision avoidance control decisions. By obtaining image data from the camera sensor, recognizing turn indicator patterns, and comparing the indicated direction with the planned collision avoidance direction, the system makes real-time decisions about whether to initiate or delay control based on actual observed conditions
Solution Approach 2:
The system changes the control parameters (specifically the collision avoidance steering control start conditions) based on the frontward vehicle's indicated direction. When the indicated direction matches the planned collision avoidance direction, the system maintains stricter start conditions to ensure safety, while when they differ, it adjusts the conditions to allow later initiation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the likelihood of the host vehicle colliding with the frontward vehicle and minimizes driver discomfort by optimizing the timing and extent of collision avoidance steering controls.
Implementation Method 1
a camera sensor (21b) configured to take a picture of a view of an area ahead of a host vehicle (SV) so as to obtain image data representing the area
Data Source
AI summary
When a collision avoidance steering control start condition becomes satisfied, a driving support ECU starts a steering control to avoid a collision with a frontward vehicle. The ECU prohibits the steering control when an indicated direction by turn indications of the frontward vehicle is the same as a planned direction of the steering control. The ECU sets the start condition to a first start condition, when the turn indicators of the frontward vehicle are not indicating a turning direction. The ECU sets the start condition to a second start condition, when the indicated direction is different from the planned direction. The first and second start conditions have been set such that an inter-vehicular distance between the host vehicle and the frontward vehicle of when the second start condition can be satisfied is shorter than one of when the first start condition can be satisfied.