Railway Braking System Delay Unit for Pressure Stability
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Solution Overview
Problem
Railway vehicle braking systems experience sudden changes in braking pressure due to misrecognition of digital braking commands, leading to deteriorated responsivity, linearity, and ride comfort issues.
Innovation Solution
A railway vehicle braking system that delays the input of a braking command to an actuator for a predetermined period after determining a change in the command, converting the delayed digital signal to an analog signal for smooth actuation, thereby preventing sudden pressure changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If digital braking commands are transmitted directly to the actuator, then the braking system responds quickly, but sudden changes in braking pressure occur due to misrecognition of digital signals
Solution Approach 1:
The patent applies preliminary action by detecting changes in digital braking commands before they are fully processed and transmitted to the actuator. The system anticipates potential misrecognition issues by monitoring command transitions and preparing appropriate responses in advance, thereby preventing sudden pressure changes while maintaining quick responsivity.
Solution Approach 2:
The patent implements feedback by continuously monitoring the digital braking commands and comparing them with expected values. When misrecognition is detected through this feedback mechanism, the system can correct the error and adjust the braking pressure accordingly, ensuring stable operation while maintaining fast response capability.
2Manufacturing precision
If digital braking commands are transmitted directly to the actuator, then the braking system operates with high linearity, but misrecognition of digital signals causes deterioration in linearity
Solution Approach 1:
The patent uses feedback to verify the correctness of transmitted digital braking commands by comparing them with expected values. This feedback mechanism detects misrecognition errors and triggers correction procedures, thereby maintaining the linearity of braking pressure while improving the reliability of command transmission.
Solution Approach 2:
The patent applies preliminary anti-action by implementing error detection and correction mechanisms that act in advance to prevent misrecognition from affecting braking linearity. The system proactively identifies and corrects potential errors before they can degrade the linearity of braking pressure, thus maintaining both precision and reliability.
3Loss of time
If braking commands are changed rapidly to stop the railway vehicle, then the stopping time is reduced, but wobbling of the railway vehicle occurs due to sudden braking pressure changes
Solution Approach 1:
The patent applies preliminary action by detecting changes in braking commands before they are executed and preparing appropriate responses in advance. This allows the system to maintain rapid stopping capability while preventing the sudden pressure changes that cause wobbling, as the system is already prepared to smooth out transitions.
Solution Approach 2:
The patent implements beforehand cushioning by introducing a smoothing mechanism that anticipates sudden braking command changes and applies corrective action in advance. This cushioning effect prevents the harsh pressure transitions that cause vehicle wobbling, allowing rapid stopping without compromising ride comfort.
Data Source
AI summary
Disclosed are a railway vehicle braking system and method. The railway vehicle braking system includes a braking command generating unit generating a braking command to stop a railway vehicle, a comparison unit determining whether the braking command has been changed, a delay unit delaying and outputting the braking command depending upon a determination result from the comparison unit, and a digital-to-analog converter converting the braking command, which has been delayed by the delay unit, into an analog signal and inputting the analog signal to an actuator.