Robotic Vehicle Path Safety Using Independent Behavior Verification
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Solution Overview
Problem
Autonomously operating vehicles, such as large-scale lawn mowers or agricultural vehicles, risk diverging from their defined paths due to incorrect position recognition data, potentially causing harm to living beings or objects.
Innovation Solution
Implementing an additional safety control system that measures and compares the actual behavior of the vehicle to its expected behavior, independent of the position recognition system, to ensure the vehicle stays on track by activating safety procedures if deviations exceed predefined thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the vehicle is controlled using a position recognition system to follow a defined path, then the vehicle can operate autonomously along the path, but the vehicle may receive wrong position information and diverge from the path without detection
Solution Approach 1:
The patent implements a feedback mechanism where the actual behavior of the vehicle (measured by independent means such as odometers, encoders, or inertial sensors) is continuously compared with the expected behavior (derived from the defined path and control commands). This closed-loop feedback allows the system to detect deviations caused by wrong position information and activate safety procedures, thereby resolving the contradiction between autonomous operation and path staying accuracy.
Solution Approach 2:
The patent introduces an intermediary safety control system that acts as a mediator between the position recognition system and the vehicle control. This intermediary layer independently verifies position information by comparing actual vehicle behavior with expected behavior, and only allows control commands to proceed if verification succeeds. This resolves the contradiction by adding a protective intermediary that prevents undetected path divergence while maintaining autonomous operation.
2Productivity
If the vehicle operates with potential operational means that may cause significant damage, then the vehicle can perform its intended function, but the risk of harm to living beings and objects increases
Solution Approach 1:
The patent applies preliminary anti-action by implementing safety verification before the vehicle executes operational commands. The system pre-defines safe operating areas and expected behaviors, and continuously verifies that the vehicle remains within these boundaries before allowing operational means to activate. This preventive approach reduces the risk of harm while maintaining operational functionality.
Solution Approach 2:
The continuous feedback loop compares actual vehicle position and behavior with expected values, and triggers safety procedures (such as stopping operational means or halting movement) when deviations are detected. This feedback mechanism ensures that operational means only activate when the vehicle is confirmed to be in safe positions, thereby reducing harm risk while preserving productivity.
3Reliability
If an additional safety control system is implemented to independently verify vehicle position and behavior, then path divergence can be detected and prevented, but the system complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing the safety control system to perform multiple verification tasks using the same independent measurement means. The system simultaneously monitors position accuracy, velocity consistency, and behavioral patterns, thereby improving reliability without proportionally increasing complexity. The controller integrates these multiple verification functions into a unified safety decision-making process.
Solution Approach 2:
The system uses the vehicle's own operational data (movement commands, sensor readings) to generate expected behavior patterns, which are then used to verify actual position and behavior. This self-service approach allows the safety system to bootstrap its verification capability without requiring extensive external infrastructure, thereby improving reliability while limiting complexity growth.
Data Source
AI summary
The present invention relates to a robotic vehicle operated to move along a path, where the vehicle could be for mowing the lawn or for agricultural purposes having an operational part operating on an irregular surface. The control of the vehicle includes safety means to check that the vehicle seems to have left its path unintended.