Rail Vehicle Delay Control for Uniform Deceleration
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Solution Overview
Problem
Existing deceleration control systems for rail vehicles suffer from indeterminacy and underdetermination, leading to control variable drift and frictional inconsistencies between rail vehicles, which can be exacerbated by sensor tolerance issues and varying communication times, especially in decentralized systems.
Innovation Solution
A multi-variable delay control device and system that incorporates a delay controller and a manipulated variable controller to form a total control variable, which is fed into a control loop and feedback loop, with additional units for braking force determination and distribution, allowing for independent control of each rail vehicle unit while minimizing drift and frictional inconsistencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a decentralized deceleration control system is used for each rail vehicle unit, then the control response time is improved and communication delays are reduced, but the control variables may drift apart due to sensor tolerances and system indeterminacy
Solution Approach 1:
The patent implements a feedback mechanism where control variables from multiple rail vehicle units are continuously monitored and fed back to a central control entity. This feedback loop enables detection of control variable drift caused by sensor tolerances and allows for corrective actions to maintain consistency across the train consist, thus resolving the reliability issue while preserving the fast response advantage of decentralized control.
Solution Approach 2:
The control system is segmented into decentralized control units at each rail vehicle and a central coordination entity. Each segment operates independently with fast local response, while the central entity ensures overall consistency through coordination algorithms. This segmentation allows the system to benefit from both fast local response and global coherence.
2Reliability
If a centralized deceleration control system is used for the entire train consist, then control variable consistency is improved, but communication time increases and control dynamics are negatively impacted
Solution Approach 1:
The patent applies local quality by allowing each rail vehicle unit to have its own decentralized control unit that operates independently with local sensor data. This local autonomy provides fast response times, while a central coordination layer ensures overall consistency. The system thus achieves both fast local response and global coherence without the communication delays of fully centralized control.
3Reliability
If tolerance bands are applied to prevent control variable drift, then control variable consistency is improved, but control accuracy is reduced
Solution Approach 1:
The patent implements dynamic adjustment of control variables through continuous feedback and coordination algorithms. Rather than applying static tolerance bands that reduce accuracy, the system dynamically adapts control variables based on real-time conditions, maintaining both consistency and high control accuracy. The dynamic coordination allows for precise control while preventing drift through active management rather than passive tolerance accommodation.
4Reliability
If control variable limits are implemented to prevent drift, then control variable consistency is improved, but frictional equilibrium between rail vehicles is disrupted
Solution Approach 1:
The feedback mechanism continuously monitors control variables and their effects on frictional forces between rail vehicles. When control variables approach limits that would disrupt frictional equilibrium, the feedback loop detects this and adjusts control variables to maintain both consistency and frictional balance. This active feedback control prevents the harmful effects of arbitrary limits while maintaining control variable consistency.
Data Source
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AI summary
The present invention relates to a multivariable delay control device (10) for a rail vehicle unit (1), comprising: - a delay controller (20), which is configured to determine a delay controller manipulated variable (ua,1) for the rail vehicle unit (1); and - a manipulated variable controller (30), which is configured to determine a manipulated variable controller manipulated variable (uc,1) for the rail vehicle unit (1); wherein the multivariable delay control device (10) is configured to form a total manipulated variable (u1) for the rail vehicle unit (1) from the delay controller manipulated variable (ua,1) and the manipulated variable controller manipulated variable (uc,1) and to feed the total manipulated variable (u1) to a control path (21, 22, 23) for a braking force generation unit (40) and to a return line (31, 32, 33) to the manipulated variable controller (30).