Heavy-Haul Train Brake Release Using Solenoid Valve Synchronization
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Solution Overview
Problem
Heavy-haul trains experience significant longitudinal impulse force during release due to the time difference in compressed air arrival at different train cars, leading to extended release intervals and increased operational difficulty, especially during cycling braking on long grades.
Innovation Solution
A system with solenoid valves connected to control valves in each train car, allowing for synchronized release through electrical signals, which travel faster than air pressure, and an auxiliary air reservoir inflation mechanism to maintain pressure consistency during braking and release processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If compressed air is supplied to the train pipe in two-point air supply mode, then the train pipe can be inflated, but the compressed air arrives at different train cars at different times causing extended release interval and increased longitudinal impulse force
Solution Approach 1:
The patent replaces the traditional pneumatic control system with an electric control system. Solenoid valves are installed at each train car to control the exhaust ports of control valves. When the solenoid valves are simultaneously de-energized, they open the exhaust ports at the same time, enabling synchronized release across all train cars. This electrical control mechanism substitutes the slow pneumatic wave propagation with fast electrical signal transmission, resolving the contradiction between release speed and impulse force.
2Duration of action of moving object
If the auxiliary air reservoir is inflated only during the release process, then the system is simple, but the inflation time is insufficient for cycling braking on long heavy down grade
Solution Approach 1:
The patent implements preliminary action by enabling the auxiliary air reservoir to be inflated during both the release maintaining state (when solenoid valve is energized and control valve is in release position) and the release process. This advance inflation ensures that the auxiliary air reservoir reaches sufficient pressure before braking is needed, providing adequate time for cycling braking operations on long heavy down grades without complicating the control system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the longitudinal impulse force by synchronizing the release of train cars and ensures consistent braking capacity and efficiency by maintaining auxiliary air reservoir pressure, matching re-inflation with natural acceleration on grades.
Implementation Method 1
the exhaust port is connected to a solenoid valve by means of a pipeline, the solenoid valve is closed if powered on, and the solenoid valve is opened if powered off
Implementation Method 2
the compressed air output by the locomotive air compressor arrives at the control valves of different train cars at different times through the train pipes
Data Source
AI summary
A system for releasing the heavy-haul train has a control valve mounted in each of train cars. The control valve is connected to a train pipe, an auxiliary air reservoir and a brake cylinder are connected to the control valve, and an exhaust port is configured on the control valve. The exhaust port is connected to a solenoid valve. The method for improving the release performance of the heavy-haul train includes: S1: the solenoid valve in each of the train cars is powered on to close a passage between the exhaust port of the control valve and the atmosphere; S2: an automatic brake valve is regulated to inflate the train pipe; and S3: the solenoid valve in each of the train cars is powered off to open the passage between the exhaust port of the control valve and the atmosphere, so that the train is released.