Adaptive Acceleration Control for Driving-Assisted Vehicles
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Solution Overview
Problem
Existing driving-assisted vehicle systems fail to maintain a suitable sense of acceleration and prevent traffic flow disturbances across various roads with different speed limits, as they only consider the deviation between speed limits and vehicle speed, leading to unpleasant passenger experiences and traffic disruptions.
Innovation Solution
A method and device that generate a target vehicle speed based on the actual speed limit of the travel path, adjusting acceleration and deceleration limits according to the speed limit, with acceleration limits increasing as speed limits rise and deceleration limits increasing as speed limits decrease, to ensure smooth travel and passenger comfort across different road types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same acceleration is set for all speed limits, then the acceleration is sufficient for high-speed roads, but the acceleration becomes excessive for metropolitan areas causing passenger discomfort and traffic disturbance
Solution Approach 1:
The acceleration limit is made dynamic by linking it to the detected speed limit. The control unit adjusts the acceleration limit in real-time based on the speed limit of the current road section, transitioning from a static fixed acceleration limit to a dynamic adaptive limit that changes with road conditions.
Solution Approach 2:
The acceleration limit parameter is changed according to the speed limit parameter. When the speed limit is high, the acceleration limit is increased; when the speed limit is low, the acceleration limit is decreased. This parameter coupling ensures acceleration performance matches the road environment.
2Object-affected harmful factors
If acceleration is limited for metropolitan areas, then passenger comfort is improved, but acceleration becomes insufficient for high-speed roads causing traffic flow disturbance
Solution Approach 1:
The system dynamically adjusts the acceleration limit based on the detected speed limit environment. In metropolitan areas with low speed limits, the acceleration limit is reduced for comfort; on high-speed roads, the acceleration limit is increased for performance, achieving context-dependent optimization.
Solution Approach 2:
The acceleration limit parameter is modified according to the speed limit parameter detected in different environments. This parameter adaptation allows the system to provide appropriate acceleration characteristics for both metropolitan areas and high-speed roads.
3Device complexity
If a fixed acceleration limit is used, then the system is simple to implement, but it cannot adapt to different road types with different speed limits
Solution Approach 1:
The control unit detects the speed limit of the current road section and uses this feedback to adjust the acceleration limit. This feedback mechanism enables the system to adapt to different road types while maintaining a relatively simple structure by leveraging existing detection capabilities.
Solution Approach 2:
The speed limit detection mechanism serves multiple functions: it provides information for acceleration limit adjustment and can be used for other speed control purposes. This multi-functionality increases adaptability without significantly increasing system complexity.
Data Source
AI summary
A target vehicle speed generation device includes a controller for generating a target vehicle speed of a host vehicle in accordance with a speed limit of a travel path of the host vehicle. The controller includes a speed limit information acquisition unit and a target vehicle speed generation unit. The speed limit information acquisition unit acquires the speed limit of the travel path of the host vehicle during travel. The target vehicle speed generation unit generates a target acceleration together with the generation of the target vehicle speed in accordance with the speed limit. The target vehicle speed generation unit has a first acceleration limiter computation unit that, during the generating of the target acceleration, sets an acceleration limiter to increase in a direction of relaxing a limitation on acceleration correspondingly with an increase in the speed limit.