Unit-Specific Control Limits for Multi-Unit Vehicle Combinations
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Solution Overview
Problem
The complexity of coordinating and maneuvering multiple vehicle units in multi-unit vehicle combinations poses challenges in ensuring safe and precise control, particularly due to complex interactions and dynamic behaviors.
Innovation Solution
A system that acquires longitudinal velocity of the vehicle combination and determines upper and lower limits for control parameters for each unit, allowing for differentiated control settings to enhance stability and prevent roll-over and jack-knifing, while considering varying side slip angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If unified control limits are applied to all units in a vehicle combination, then the control system is simple to implement, but control precision and safety are reduced due to inability to account for individual unit dynamics
Solution Approach 1:
The control system is segmented to operate at two levels: combination-level for overall coordination and unit-level for individual unit control. Each unit receives specific control parameters and limits tailored to its characteristics, enabling precise control without requiring complete redesign of the entire control architecture. This segmentation allows differentiated control strategies for each unit while maintaining system-wide coordination.
Solution Approach 2:
The patent implements local quality by assigning different control parameters, limits, and strategies to each unit based on its specific dynamics, mass, dimensions, and operational characteristics. Instead of applying uniform control across all units, each unit receives customized control settings that optimize its individual performance and safety contributions to the overall vehicle combination.
2Reliability
If differentiated control limits are set for different units, then safety and stability are improved through stretch braking and roll-over prevention, but the control system becomes more complex
Solution Approach 1:
The control system performs preliminary actions by pre-calculating and setting appropriate control limits, parameters, and strategies for each unit before operation. Safety-critical functions such as roll-over prevention and stretch braking controls are configured in advance based on unit characteristics, allowing the system to respond safely to dynamic situations without requiring complex real-time calculations during critical moments.
Solution Approach 2:
The patent implements feedback mechanisms where each unit's controller monitors its own operational state and provides information back to the combination-level controller. This feedback enables dynamic adjustment of control parameters and limits based on actual unit performance and environmental conditions, improving safety through adaptive control while managing complexity through decentralized information processing.
3Stability of the object's composition
If unit-level control is implemented with different limits for each unit, then stability and precision are enhanced, but coordination and maneuvering complexity increases
Solution Approach 1:
The patent merges unit-level control capabilities with combination-level coordination functions into an integrated control architecture. While each unit operates with its own customized parameters and limits, the combination-level controller coordinates their interactions through standardized communication protocols and unified control objectives, ensuring stable and predictable vehicle combination behavior during maneuvering operations.
Data Source
Figure 1A~1B
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AI summary
A computer system comprising processing circuitry configured to: acquire a longitudinal velocity of a vehicle combination comprising a tractor unit and at least one trailing unit; and determine an upper limit and/or a lower limit for a control parameter for at least one unit of the vehicle combination based on the acquired longitudinal velocity; and transmit the upper and/or lower limit to a controller of the at least one unit of the vehicle combination. A corresponding computer-implemented method is also disclosed.