Autonomous Drive Velocity Control via Dynamic Speed Limit Adjustment
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Solution Overview
Problem
Autonomous driving systems face limitations in enabling continuous autonomous operation due to constraints on speed limits and vehicle velocities, leading to increased manual driving requirements.
Innovation Solution
A control arrangement that adjusts autonomous drive functions based on the difference between the vehicle's maximum autonomous velocity and received speed limits or preceding vehicle velocities, enabling autonomous driving when conditions allow and disabling it when speed limits exceed safe operational ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the autonomous drive arrangement is enabled only when sensors provide sufficient information and velocity is within a specific interval, then safety and reliability are improved, but the extent of automation and productivity deteriorate due to increased manual driving requirements
Solution Approach 1:
The control arrangement dynamically adjusts the autonomous drive maximum velocity based on real-time conditions including speed limits and preceding vehicle velocities. The system transitions between manual and autonomous modes flexibly, allowing the autonomous drive maximum velocity to be modified within the autonomous drive velocity interval rather than maintaining a fixed limit, thereby increasing automation extent while preserving safety
Solution Approach 2:
The system changes the parameter of autonomous drive maximum velocity based on external factors such as speed limits and preceding vehicle velocities. When the speed limit exceeds the autonomous drive maximum velocity, the system receives real-time preceding vehicle velocity data and adjusts the autonomous drive maximum velocity parameter accordingly, enabling extended autonomous operation in scenarios where speed limits are higher than the standard autonomous velocity interval
2Reliability
If the autonomous drive arrangement operates within a limited velocity interval, then reliability is improved, but productivity deteriorates due to reduced autonomous driving opportunities
Solution Approach 1:
The autonomous drive velocity interval is made dynamic rather than static. The control arrangement continuously adjusts the autonomous drive maximum velocity within the velocity interval based on real-time conditions including speed limits and preceding vehicle velocities, allowing the system to maximize autonomous operation duration and distance while maintaining operational reliability
Solution Approach 2:
The system uses received information from external sources about preceding vehicle velocities to automatically adjust its own autonomous drive maximum velocity parameter, enabling the autonomous drive arrangement to serve itself by optimizing its operational parameters based on environmental conditions, thereby increasing productivity
3Productivity
If the autonomous drive maximum velocity is increased to match higher speed limits, then productivity is improved, but safety deteriorates due to exceeding sensor and host vehicle function limitations
Solution Approach 1:
The control arrangement implements feedback by continuously receiving information from sensors about the vehicle surrounding and comparing it with the adjusted autonomous drive maximum velocity. The system uses this feedback to ensure that even when the autonomous drive maximum velocity is increased to match higher speed limits, the sensors continue to provide sufficient information for safe autonomous operation
Solution Approach 2:
The control arrangement acts as an intermediary between the autonomous drive arrangement and the external environment (speed limits, preceding vehicles). It receives information from external sources, processes it, and adjusts the autonomous drive maximum velocity accordingly, mediating between the need for higher productivity and the safety constraints of the sensor system
Data Source
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Figure 2a
Figure 2b
AI summary
A vehicle (100), a method (300), a control arrangement (1) and an autonomous drive arrangement (3) are provided. The control arrangement (1) is arranged to control the autonomous host vehicle drive arrangement (3) in a host vehicle (100) comprising; the autonomous drive arrangement (3) which is arranged to control steering and velocity of the host vehicle (100) up to an autonomous drive maximum velocity of the host vehicle (100), a speed limit determination unit (7), a communication unit (9) arranged to receive, from at least one external source (15a, 15b, 15c), real time preceding vehicle velocity (v', v") for one or more preceding vehicles (14). The control arrangement (1) is arranged to control the autonomous drive arrangement (3) in dependence of a difference between the autonomous drive maximum velocity and at least one of; a speed limit and at least one preceding vehicle velocity (v', v").