Railway Signal Control Device Proportional Braking Force
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Solution Overview
Problem
Current signal control devices for railway cars face challenges in accurately applying varying braking forces based on the weight of the car's contents, leading to potential failure to stop or vibration issues due to inappropriate braking force, and excessive brake force causing flat spots on wheels.
Innovation Solution
A signal control device with a cylindrical body containing two spools and a piston, where the spools are positioned to move relative to each other within the body, allowing for fluid communication changes based on pressure inputs, enabling proportional braking force application by adjusting the fluid flow to the brake cylinder based on the car's weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a proportional valve with mechanical weight measurement components is used to control braking force, then the braking force can be adjusted based on car weight, but the device complexity increases and reliability decreases due to additional mechanical components
Solution Approach 1:
The patent replaces mechanical weight measurement components with a pneumatic/hydraulic system. The weight of the railway car is transmitted through the air suspension system as air pressure variations to the proportional valve, eliminating the need for separate mechanical sensors and weight measurement mechanisms. This substitution reduces device complexity while maintaining the ability to adjust braking force according to car weight.
Solution Approach 2:
The air suspension system acts as an intermediary between the railway car weight and the proportional valve. Instead of directly measuring weight with mechanical components, the system uses air pressure as a mediator to transmit weight information to the braking control system, simplifying the overall device architecture.
2Speed
If excessive brake force is applied to railway car wheels, then stopping distance is reduced, but flat spots form on wheels causing catastrophic vibrations
Solution Approach 1:
The proportional valve dynamically adjusts the braking force based on real-time air pressure signals that reflect the actual weight of the railway car. This dynamic adjustment ensures that the braking force is optimized for each specific load condition, achieving short stopping distances without applying excessive force that could damage the wheels.
Solution Approach 2:
The system uses air pressure from the suspension system as feedback about the railway car's weight. This feedback mechanism allows the proportional valve to automatically adjust braking force to match actual loading conditions, preventing both insufficient braking and excessive braking that could cause wheel flat spots.
3Reliability
If inappropriate braking force is applied to railway cars, then stopping performance deteriorates, but wheel disengagement and vibrations may occur
Solution Approach 1:
The system changes the parameter of braking force according to the weight parameter of the railway car. By using air pressure as a variable that correlates with car weight, the proportional valve adjusts braking force to match actual loading conditions, ensuring reliable stopping performance while preventing wheel instability and disengagement.
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
The solution ensures precise control of braking force proportional to the railway car's weight, preventing wheel disengagement and vibrations, while maintaining optimal braking performance by adjusting the fluid flow and pressure distribution within the braking system.
Implementation Method 1
fluid communication changes based on pressure inputs, enabling proportional braking force application
Data Source
AI summary
The present invention is directed to a signal control device having a body with a generally cylindrical cavity having a longitudinal central axis, a first and second input, and a first and second output. Each input and output is in fluid communication with the body. The signal control device further contains a first spool with a first end and an opposite second end, each which define a recess, a central axis between the first and second ends and a through hole formed about the central axis. The signal control device also contains a second spool with a first end, an opposite second end, a second central axis between the first and second ends, and a bore. The bore has a first end opening at the first end of the second spool and has a second end opening intermediate the first and second ends of the second spool. The first spool and second spool are positioned within the body cavity so that their corresponding central axes are collinear.