Rail Wheel Traction Airflow Control With Selective Orifice Switching
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Solution Overview
Problem
Existing tractive effort systems in vehicles, particularly rail vehicles, are limited by the amount of contact friction between wheels and the rail surface, which can be reduced by contaminants such as snow, ice, or water, leading to loss of traction and potential system interruptions due to pressure loss or leakage.
Innovation Solution
A continuous flow tractive effort system that uses a delivery system with parallel paths and solenoid valves to selectively control airflow through different orifice sizes based on operating conditions, ensuring continuous airflow for surface cleaning and maintaining traction, even under varying pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air is used to clean the rail surface to improve traction, then adhesion benefits are improved, but system complexity increases due to the need for parallel paths and solenoid valves
Solution Approach 1:
The compressed air delivery system is divided into parallel paths with different orifice sizes, allowing independent control of airflow rates through solenoid valves. This segmentation enables adaptive response to varying traction conditions while maintaining manageable system complexity through modular design
Solution Approach 2:
The system dynamically adjusts airflow rates by selectively opening solenoid valves corresponding to different orifice sizes based on real-time traction conditions. This dynamic adaptability allows the system to optimize adhesion benefits while responding to changing operational requirements
2Productivity
If larger orifice sizes are used to increase airflow for surface cleaning, then cleaning effectiveness is improved, but air pressure loss increases
Solution Approach 1:
The delivery system segments airflow into multiple paths with different orifice sizes, enabling selective use of larger orifices for high-flow cleaning when needed, while smaller orifices maintain adequate airflow with lower pressure loss during normal operation
Solution Approach 2:
The system changes airflow parameters by selectively activating different orifice sizes based on operational conditions. This allows optimization of the balance between cleaning effectiveness and air pressure loss by adjusting which orifice paths are active
3Adaptability or versatility
If multiple solenoid valves and parallel paths are added to control airflow selectively, then adaptability to operating conditions is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into multiple independent solenoid valve circuits, each controlling a specific orifice size. This modular segmentation provides adaptability to different operating conditions while keeping each control module simple and manageable
Solution Approach 2:
The parallel path structure with multiple orifice sizes provides multi-functionality, allowing the same delivery system to adapt to various airflow requirements. This universal design approach enhances adaptability without requiring entirely separate systems for different conditions
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 system provides continuous adhesion benefits by maintaining traction on wet or contaminated surfaces, reducing interruptions, and ensuring consistent performance by adapting airflow based on pressure and leakage conditions.
Implementation Method 1
flowing compressed gas selectively through distinct orifice sizes depending on an operating condition of a vehicle
Implementation Method 2
compressed air is selectively directed through one or both of first and second orifice sizes toward a location on a route surface that is upstream of a vehicle wheel
Data Source
AI summary
Methods and systems for operating a vehicle are provided. In one example, a method for operating a vehicle may include flowing compressed gas selectively through distinct orifice sizes depending on an operating condition of the vehicle. In another example, the vehicle may be a rail vehicle. In one example, the compressed gas may include compressed ambient air, and where the compressed gas is selectively delivered toward an upstream of a vehicle wheel riding on a rail via a nozzle. In another example, the compressed gas may be selectively delivered through a first orifice and not a second orifice to the nozzle during a first condition, and delivered through the second orifice and not the first orifice during a second condition different from the first condition.