Rail Brake Valve Opening Time Correction Device
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Solution Overview
Problem
Existing pneumatic brake systems in rail vehicles face issues with inaccurate valve opening times due to imprecise design specifications and parameterization, leading to increased switching cycles, reduced control accuracy, and instability, especially in modular systems with various component variants.
Innovation Solution
A brake system with a valve opening time correction device that uses a signal input interface to detect pressure differences and adjust the effective valve opening time based on a reference system's pneumatic properties, allowing for real-time correction of valve opening times to achieve the desired pressure changes efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If model-based pressure control is used with predetermined valve opening times, then control speed is improved, but control accuracy deteriorates due to inaccurate design specifications and parameter settings
Solution Approach 1:
The patent implements a feedback mechanism where the actual pressure development in the pneumatic system is continuously monitored and compared with the desired pressure trajectory. Based on this comparison, the valve opening time is dynamically adjusted to compensate for deviations caused by inaccurate design specifications. This closed-loop control ensures that the actual pressure follows the desired pressure curve accurately, resolving the contradiction between fast control speed and accurate control.
2Device complexity
If characteristic parameters are determined based on design data, then device complexity is reduced, but reliability deteriorates due to deviations from actual pneumatic system properties
Solution Approach 1:
The patent dynamically adjusts the characteristic parameters of the pneumatic system based on actual measured pressure values during operation. Instead of relying solely on fixed design data, the system adapts parameters such as volume and pneumatic conductance to match the actual system behavior. This parameter adaptation ensures reliable pressure control even when there are deviations between design specifications and actual system properties.
3Measurement precision
If valve opening time is increased to compensate for slow pressure changes, then pressure change accuracy is improved, but switching cycles increase reducing productivity
Solution Approach 1:
The patent implements dynamic adjustment of the valve opening time based on the actual pressure development rate. When pressure changes slowly, the valve opening time is extended; when pressure changes rapidly, the valve opening time is reduced. This dynamic adaptation allows the system to achieve accurate pressure control without unnecessarily increasing switching cycles, thereby maintaining high productivity and braking system responsiveness.
Data Source
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AI summary
The invention relates to a braking system having a correction device (1) for correcting an opening time of a valve (103), which braking system comprises a signal input interface for a signal of a most recently input effective valve opening time (154), a signal input interface for a pressure (156) before the valve (103) after the most recently input effective valve opening time (154), a signal input interface for a pressure difference (125) between a pressure after the valve (103) before and after a current specification of the effective valve opening time (153), a valve opening time determination apparatus, which determines an effective reference system valve opening time (160) from the pressure difference (125) after the valve (103), the pressure (156) after the most recently input specification of the effective valve opening time (154) before the valve (103) and a parameter of the reference system (111) defining the pneumatic properties of a reference system (111), a correction time determination apparatus (127), which determines a correction time (162) as a difference between the most recently input effective valve opening time (154) and the effective reference system valve opening time (160), an addition apparatus (129), which adds up the correction times (162) after a current effective valve opening time (152) to form a summed correction time (164), and a signal output for the summed correction time (164), by means of which summed correction time the current effective valve opening time (153) is corrected.