In-Vehicle ACC Control for Intersection Lane Change Scenarios
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Solution Overview
Problem
In autonomous driving systems, vehicles using Adaptive Cruise Control (ACC) face challenges when entering intersections, as they may decelerate in response to preceding vehicles changing lanes or turning, leading to potential collisions due to misinterpretation of lane markings.
Innovation Solution
An in-vehicle system that includes a control unit to follow a preceding vehicle, a detection unit for lane markings, and a determination unit to identify intersection areas, allowing the system to release ACC control when lane markings are interrupted, enabling the vehicle to maintain a safe distance and avoid deceleration based on preceding vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ACC control continuously follows the preceding vehicle based on lane marking detection, then the vehicle can maintain proper lane position and avoid collisions, but the vehicle may unnecessarily decelerate when the preceding vehicle changes lanes or turns at intersections
Solution Approach 1:
The determination unit preemptively identifies intersection areas using map data before the vehicle enters them. When an intersection is detected, the system prepares to suspend ACC control, preventing the problematic deceleration from occurring in the first place. This preliminary action allows the vehicle to maintain speed through intersections while still providing ACC functionality in normal driving conditions.
Solution Approach 2:
The system dynamically adjusts ACC control behavior based on the vehicle's location. In normal areas, ACC is active and follows lane markings. When entering an intersection area, the system transitions to suspend ACC control. This dynamic adaptation allows the system to optimize both lane position accuracy and vehicle speed by adjusting control intensity according to environmental context.
2Measurement precision
If the system uses lane marking detection to determine vehicle position, then the vehicle can accurately identify its lane, but lane markings become undetectable when the preceding vehicle crosses them during lane changes or turns
Solution Approach 1:
The determination unit acts as an intermediary that uses map data to identify intersection areas where lane marking detection is likely to fail. By suspending ACC control in these areas, the system avoids making decisions based on incomplete or misleading lane marking information. This intermediary layer protects the system from making erroneous deceleration decisions when visual information is compromised.
3Reliability
If ACC control is maintained during intersection passage, then the vehicle follows the preceding vehicle's behavior, but the vehicle may decelerate at green signals when the preceding vehicle turns, causing potential rear-end collisions
Solution Approach 1:
The system preemptively identifies intersection areas using map data before the vehicle enters them. When an intersection is detected, the system prepares to suspend ACC control, preventing the problematic deceleration from occurring in the first place. This preliminary action allows the vehicle to maintain speed through intersections while still providing ACC functionality in normal driving conditions.
Solution Approach 2:
The system converts the potential harm of lost lane marking detection into a benefit by using the absence of detectable lane markings (or interrupted detection) as a trigger to suspend ACC control. This transforms a detection failure into a useful signal for adjusting control behavior, improving both safety and throughput.
Data Source
AI summary
Provided is an in-vehicle system in which an own vehicle does not decelerate according to a preceding vehicle even if the preceding vehicle changes lanes to the right turn lane or the left turn lane and decelerates after own vehicle entering an intersection area. A CPU 107 (first control unit) controls the own vehicle to follow the preceding vehicle. An image processing circuit 106 (detection unit) detects a lane marking of the traveling lane. The CPU 107 (determination unit) determines whether an own vehicle 201 has entered the intersection area. When the detection of one of the right and left lane markings of the traveling lane is interrupted (S20: YES) after the own vehicle 201 has entered the intersection area (S15: YES), the CPU 107 (second control unit) releases ACC that causes the own vehicle 201 to follow the preceding vehicle 202.