Vehicle Speed Control Using Driver-Learned Road-Type Corrections
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Solution Overview
Problem
Current autonomous control systems for vehicles fail to accurately set speed based on driver preference, particularly on terrains with varying speed limits between straight and curved roads, leading to difficulties in maintaining optimal speed settings.
Innovation Solution
A vehicle control device with a speed determining unit, counting unit, and correction value calculating unit that adjusts the set speed based on speed limit, correction coefficients, and driver input, ensuring the speed reflects the driver's preference by calculating a new correction value for each change in speed and updating it to maintain alignment with the road's speed limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the autonomous control system uses the speed set by the driver as feedback during driving, then the system can maintain basic speed control, but it fails to accurately reflect driver preference on terrains with varying speed limits between straight and curved roads
Solution Approach 1:
The system segments the terrain into different road types (straight roads and curved roads) and maintains separate correction values for each type. This allows the system to adapt to different terrain characteristics while maintaining precise speed determination for each segment type independently.
Solution Approach 2:
The system pre-classifies roads into straight and curved types and prepares appropriate correction values for each type before driving. When the vehicle enters a specific road type, the corresponding correction value is already ready, enabling immediate and accurate speed adjustment without delay.
2Measurement precision
If the system frequently updates the correction value based on each driver input, then it can reflect driver preference accurately, but it may cause excessive fluctuations in speed settings
Solution Approach 1:
The system pre-defines separate correction values for straight roads and curved roads. When the vehicle enters a specific road type, the corresponding pre-prepared correction value is applied, avoiding excessive fluctuations while accurately reflecting driver preference for that terrain type.
Solution Approach 2:
The system dynamically switches between different correction values based on the current road type (straight or curved). This dynamic adaptation allows the system to maintain stability within each road type while adapting to changes in terrain, preventing excessive speed fluctuations.
3Device complexity
If the system uses a single correction value for all road types, then the control logic is simple, but it cannot properly adapt to different speed limit requirements on straight and curved roads
Solution Approach 1:
The system segments the correction value into two distinct types: one for straight roads and one for curved roads. This segmentation maintains relatively simple control logic within each segment while enabling the system to adapt to different speed limit requirements for different road types.
Solution Approach 2:
The system applies different correction values locally to different road types. Straight roads receive one correction value while curved roads receive another, allowing the system to adapt to local speed limit requirements without requiring complex overall control logic.
Data Source
AI summary
A vehicle control device has a processor configured to determine a set speed for a vehicle representing a target speed based on a speed limit of a road, and a current correction value corresponding to the speed limit of the road, count a number of changes the set speed for the vehicle has been changed by a driver, and calculate a new correction value for the set speed for the vehicle based on a correction coefficient determined based on the number of changes, and speed difference between the set speed for the vehicle after change and the speed limit of the road, each time the number of changes has been counted, wherein the next set speed for the vehicle is determined based on the speed limit of the road on which the vehicle is traveling and the new correction value corresponding to the speed limit of the road.