Vehicle Speed Control on Curved Roads Using Map-Camera Target Blending
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Solution Overview
Problem
Existing vehicle control systems struggle to set an appropriate target speed on curved roads due to changes in curvature detection caused by steering operations, leading to unstable speed adjustments.
Innovation Solution
A vehicle control system that combines target speeds derived from external environment detection and map information, adjusting the ratio based on relative speed and curvature, using a formula to stabilize speed control on curved roads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If target speed is set using curvature detection from camera, then speed adjustment responds to road shape, but curvature detection changes significantly due to steering operations causing unstable target speed
Solution Approach 1:
The patent combines map information (which provides stable, pre-defined curvature data) with camera-based curvature detection (which provides real-time feedback) to determine the target speed. This merging of information sources allows the system to maintain stable target speed settings on curved roads while still responding to actual road conditions, overcoming the instability caused by steering operations affecting camera-based detection alone.
2Adaptability or versatility
If target speed is adjusted based on real-time curvature detection, then speed control adapts to current road conditions, but detection accuracy deteriorates when vehicle direction changes due to steering
Solution Approach 1:
The patent introduces map information as an intermediary reference that provides stable curvature data independent of vehicle steering operations. By using map information as a baseline and combining it with real-time camera detection, the system maintains measurement precision even when the vehicle direction changes during steering, while still adapting to current road conditions.
3Device complexity
If only camera-based curvature detection is used, then system complexity is reduced, but reliability of target speed setting decreases on curved roads
Solution Approach 1:
The patent makes the target speed setting system multi-functional by incorporating both map information processing and camera-based real-time detection. This universal approach allows the system to reliably determine target speeds on curved roads by cross-validating information from multiple sources, significantly improving reliability compared to using camera-based detection alone, while maintaining reasonable system complexity through integrated processing.
Data Source
AI summary
A storage medium of an embodiment is a non-transient storage medium storing computer-readable instructions to be executed by a computer. The instructions include recognizing a surrounding conditions of a vehicle based on detection result of an external environment detection device, setting a first target speed of the vehicle based on the surrounding conditions, setting a second target speed of the vehicle based on map information, selecting one of the first target speed and the second target speed and controlling a speed of the vehicle based on the selected target speed, setting a target speed by combining the first target speed and the second target speed at a ratio according to traveling conditions of the vehicle when a curved road is present in a traveling direction of the vehicle, and controlling the speed of the vehicle based on the set target speed.