Autonomous Vehicle Stop Sign Speed Control With Dual-Range Detection
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Solution Overview
Problem
Current autonomous vehicle systems struggle to accurately locate and stop at road signs or traffic lights beyond a 50-meter camera range, leading to potential braking delays that compromise driving comfort.
Innovation Solution
A method and device utilizing dual detecting means with different ranges – a long-range GPS for initial detection and a short-range camera for precise positioning – to implement phased slowdown logic, ensuring accurate and comfortable stopping with controlled jerk profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a front-view camera is used to locate the stopping point, then the stopping point can be accurately located, but only when it is located less than 50 meters from the vehicle
Solution Approach 1:
The patent combines a long-range detecting means (such as GPS or radar with range exceeding 50 meters) and a short-range front-view camera into an integrated detection system. The long-range detector provides early warning of stopping points beyond 50 meters, while the camera provides accurate location data when the stopping point is within its effective range, thereby resolving the contradiction between detection range and measurement precision.
Solution Approach 2:
The long-range detecting means detects the stopping point in advance before it enters the camera's 50-meter range, allowing the system to prepare for deceleration earlier. This preliminary detection action enables the vehicle to begin slowing down at appropriate distances while maintaining accurate stopping point localization when the camera takes over for precise positioning.
2Speed
If braking is delayed due to camera range limitations, then the vehicle can maintain higher speed longer, but braking comfort cannot be guaranteed
Solution Approach 1:
The long-range detecting means identifies stopping points before they enter the camera's detection range, enabling the control system to initiate deceleration in advance. This preliminary action allows the vehicle to reduce speed gradually and smoothly, maintaining passenger comfort while still achieving timely braking, thereby resolving the contradiction between maintaining speed and ensuring braking comfort.
3Device complexity
If a single detecting means is used, then the system is simple, but it cannot provide both long-range detection and high-accuracy positioning
Solution Approach 1:
The detection system is segmented into two functional components: a long-range detecting means for early detection of stopping points at distances beyond 50 meters, and a short-range front-view camera for high-precision location determination when the stopping point is nearby. This segmentation allows each component to perform its specialized function optimally, achieving both long-range detection capability and high-accuracy positioning while keeping the overall system relatively simple.
4Loss of time
If long-range detection is implemented, then early warning of stopping points is achieved, but stopping point location accuracy decreases
Solution Approach 1:
The long-range detecting means performs preliminary detection of stopping points at early stages, providing timely warning. When the stopping point enters the camera's effective range, the system switches to using the camera for high-accuracy location determination. This two-stage approach with preliminary action by the long-range detector and precision measurement by the camera resolves the contradiction between early detection and accurate positioning.
Solution Approach 2:
The system merges the early detection capability of long-range sensors with the high-precision positioning capability of the front-view camera. By combining these two detection means and coordinating their operations based on distance thresholds, the system achieves both early warning (reducing detection time loss) and accurate location determination, resolving the contradiction between detection timing and positioning precision.
Data Source
AI summary
A method for managing longitudinal speed of an autonomous vehicle travelling on a traffic lane including stop signage located in front of the autonomous vehicle. The autonomous vehicle is equipped with a first detector to detect a first range and a second detector to detect a second range. The first range is greater than the second range. The method includes detecting the stop signage by the first detector and implementing a first deceleration logic and detecting the stop signage by the second detector and implementing a second deceleration logic. The first and second deceleration logic implement jerks, the absolute value of which is less than a first threshold. The second deceleration logic controls the stopping of the autonomous vehicle with an accuracy of around one centimeter relative to the stop signage.