Travel Control Device Low-Speed Maneuver Adaptation
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Solution Overview
Problem
Existing automatic driving systems do not adequately consider scenarios where the vehicle needs to change lanes or perform turns at low speeds, leading to potential prolonged stops or difficulties in adapting to surrounding traffic conditions.
Innovation Solution
A travel control device that adjusts vehicle behavior limits based on speed, allowing greater freedom in movement, turning, and spacing from obstacles during stopped or slowly traveling states, enabling smoother lane changes and turns by expanding the travel enabled region and alleviating restrictions on acceleration and deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle behaves with excessive caution during automatic driving to prevent intervention by other vehicles, then safety is improved, but the vehicle remains stopped for a prolonged time period
Solution Approach 1:
The patent applies dynamics by making the travel enabled region variable based on vehicle speed. At low speeds (stopped or slowly traveling state), the system expands the travel enabled region to allow lane changes and turns that would otherwise be restricted. This dynamic adjustment enables the vehicle to respond more flexibly to traffic conditions and perform necessary maneuvers without prolonged stopping, while maintaining safety through speed-based region constraints.
2Reliability
If the vehicle maintains strict limitations on traveling during automatic driving, then safety is improved, but adaptability to traffic conditions deteriorates
Solution Approach 1:
The system dynamically adjusts the travel enabled region based on vehicle speed. When the vehicle is stopped or traveling slowly, the travel enabled region is expanded to include areas necessary for lane changes and turns. When the vehicle travels at normal speeds, the region is constrained to maintain safety. This dynamic adaptation allows the vehicle to flexibly respond to varying traffic conditions while maintaining appropriate safety constraints.
Solution Approach 2:
The patent changes the parameter of travel enabled region based on vehicle speed. By using speed as a threshold parameter, the system transitions between different region configurations - a restricted region for normal speeds and an expanded region for low-speed maneuvers. This parameter-based approach enables automatic adaptation to traffic conditions while maintaining safety through speed-dependent constraints.
3Ease of operation
If the vehicle expands the travel enabled region during low-speed maneuvers, then ease of operation is improved, but safety risks may increase
Solution Approach 1:
The patent applies local quality by expanding the travel enabled region specifically for low-speed maneuvers such as lane changes and turns, rather than uniformly expanding it at all speeds. The system maintains restricted regions for normal-speed travel while creating localized expanded regions when the vehicle is stopped or traveling slowly. This localized approach enables necessary maneuvers while maintaining safety constraints for higher-speed operations.
Data Source
AI summary
A travel control device sets a limitation in relation to traveling of a vehicle during automatic driving. Further, compared with a case in which the vehicle is not in a stopped state or not in a slowly traveling state, or a case in which the vehicle velocity is in excess of a vehicle velocity threshold value by which the stopped state or the slowly traveling state is determined, the travel control device alleviates the limitation in a case in which the vehicle is in the stopped state or in the slowly traveling state, or in a case in which the vehicle velocity is lower than the vehicle velocity threshold value.