Adaptive Acceleration Threshold for Curved Route Travel Control
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Solution Overview
Problem
Existing drive-assistance systems uniformly prohibit acceleration on curves, leading to driver dissatisfaction and increased apprehension when another vehicle is present on the outside of the curved route, as the acceleration threshold value is not dynamically adjusted based on the presence of other vehicles.
Innovation Solution
A method and device that dynamically adjust the acceleration threshold value for suppressing acceleration on a curved route, setting a lower threshold when another vehicle is present on the outside-peripheral-side curved route, allowing for more situations where acceleration is permitted, thereby reducing driver apprehensiveness and maintaining the desired trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acceleration is uniformly prohibited on curved routes, then safety is improved by preventing deviation from desired trajectory, but driver satisfaction deteriorates due to unnecessary restriction of acceleration
Solution Approach 1:
The patent applies dynamics by making the acceleration threshold value adjustable rather than fixed. The threshold is dynamically modified based on the presence of other vehicles and the specific curve conditions, allowing the system to adapt between conservative safety-mode (lower threshold) and permissive performance-mode (higher threshold), thereby resolving the contradiction between safety and driver satisfaction
Solution Approach 2:
The patent changes the parameter of acceleration threshold value based on different operational conditions. When no other vehicles are present, a higher threshold allows acceleration; when other vehicles are detected, a lower threshold restricts acceleration. This parameter adaptation resolves the contradiction by making the restriction conditional rather than uniform
2Ease of operation
If a high acceleration threshold is used on curved routes, then more acceleration situations are permitted improving driver satisfaction, but driver apprehension increases when another vehicle is present on the outside of the curve
Solution Approach 1:
The patent uses feedback by continuously monitoring the presence of other vehicles on or near the curved route. This environmental feedback triggers dynamic adjustment of the acceleration threshold, lowering it when other vehicles are detected to reduce driver apprehension, while allowing higher thresholds when the environment is clear, thereby improving driver satisfaction
Solution Approach 2:
The patent applies local quality by creating different acceleration threshold levels for different spatial contexts. The threshold is locally adapted based on where other vehicles are positioned relative to the curve - presence on the outside triggers a lower threshold, while absence allows a higher threshold, making the safety margin context-specific rather than uniform
3Reliability
If acceleration is suppressed on curved routes, then deviation from desired trajectory is prevented improving safety, but productivity deteriorates due to reduced acceleration opportunities
Solution Approach 1:
The patent makes the acceleration suppression dynamic rather than static. The system transitions between suppression states based on real-time conditions: suppressing acceleration when other vehicles are present (maintaining trajectory safety), and permitting acceleration when conditions allow (improving productivity). This dynamic switching resolves the contradiction between trajectory maintenance and acceleration capability
Solution Approach 2:
The patent changes the acceleration threshold parameter based on traffic conditions and curve characteristics. By adjusting this parameter, the system optimizes the balance between maintaining desired trajectory (safety) and enabling acceleration (productivity), allowing productivity to increase when safety conditions are met
Data Source
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AI summary
The purpose of the present disclosure is to reduce apprehensiveness on the part of a driver while allowing for a greater number of situations where it is possible to accelerate on a curved route. Provided is a device for controlling travel of a drive-assisted vehicle, wherein a curved-route travel controller (34) has a curved-route-detecting unit (34a), an another-vehicle-detecting unit (34f), a threshold-value-establishing unit (34b), a lateral-acceleration-determining unit (34d), and a turning-acceleration-controlling unit (34e). During travel on a curved route, the threshold-value-establishing unit (34b) establishes an acceleration-prohibited lateral acceleration threshold value established as a boundary value for suppressing acceleration of a host vehicle A, said threshold value being established so as to be lower when another vehicle F is present on an outside-peripheral-side curved route E adjacent to a host-vehicle travel lane C than when another vehicle F is not present on the outside-peripheral-side curved route E. The lateral-acceleration-determining unit (34d) determines whether a lateral acceleration is greater than the acceleration-prohibited lateral acceleration threshold value during travel on a curved route. The turning-acceleration-controlling unit (34e) permits accelerating travel on the curved route while it has been determined that the lateral acceleration is less than or equal to the acceleration-prohibited lateral acceleration threshold value, but suppresses accelerating travel on the curved route when it is determined that the lateral acceleration is greater than the acceleration-prohibited lateral acceleration threshold value.