MSD Capability Feedback for Heavy-Duty Vehicle Motion Control
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Solution Overview
Problem
Current vehicle motion management systems for heavy-duty vehicles lack fine-grained optimization of motion support device (MSD) coordination, which hinders improvements in energy efficiency, component wear reduction, failure probability, and passenger comfort.
Innovation Solution
An MSD control unit determines limiting and preferred operating points for MSDs, transmitting capability messages to a vehicle motion management (VMM) function to enable optimization of secondary objectives such as energy efficiency, component wear, and passenger comfort, while maintaining compatibility with existing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the VMM system coordinates MSDs to meet motion requests, then vehicle motion control is achieved, but fine-grained optimization of secondary objectives (energy efficiency, component wear, passenger comfort) is not possible
Solution Approach 1:
The capability information is segmented into multiple levels: limiting operating points (hard constraints) and preferred operating points (soft preferences). This segmentation allows the VMM system to optimize secondary objectives by selecting from preferred operating points while ensuring hard constraints are met, without requiring complete redesign of the control architecture.
Solution Approach 2:
The MSD control units pre-determine and report both limiting and preferred operating points to the VMM system before the actual coordination task. This preliminary provision of capability information enables the VMM system to perform fine-grained optimization of secondary objectives without real-time computational complexity.
2Use of energy by moving object
If the MSD control unit reports only limiting operating points, then system compatibility is maintained, but optimization of energy efficiency and component wear is hindered
Solution Approach 1:
The capability information is enhanced with local quality details through the addition of preferred operating points for different secondary objectives (energy efficiency, component wear, passenger comfort). Each MSD control unit provides tailored capability information specific to its characteristics, enabling the VMM system to make informed optimization decisions without losing compatibility with existing systems.
3Reliability
If the system coordinates multiple MSDs to achieve desired vehicle motion, then motion control is achieved, but component wear and failure probability increase due to lack of optimization
Solution Approach 1:
The MSD control units provide feedback capability information including both limiting and preferred operating points to the VMM system. This feedback mechanism enables the VMM system to coordinate MSDs in a way that optimizes component durability by preferentially selecting operating points that reduce wear and stress, while maintaining coordination flexibility.
4Ease of operation
If the VMM system uses traditional capability reports, then system simplicity is maintained, but passenger comfort and energy efficiency cannot be optimized
Solution Approach 1:
The capability message structure is made dynamic by including optional preferred operating point information that can be adapted to different secondary objectives. The VMM system can dynamically select and weight different preferred operating points based on current operational requirements, enabling optimization of passenger comfort and energy efficiency without rigid system complexity.
Data Source
AI summary
A control unit for controlling at least one MSD on a heavy-duty vehicle is provided. The control unit is arranged to determine a limiting operating point of the MSD associated with a performance limit of the MSD, determine a preferred operating point of the MSD indicative of an operating point of the MSD associated with an improvement in a secondary objective function value compared to the limiting operating point, and transmit a capability message to a VMM function comprising the limiting operating point of the MSD and the preferred operating point of the MSD.