Rail Vehicle Air Suspension Valve Assembly Control
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Solution Overview
Problem
Existing air suspension control systems for rail vehicles are structurally complex, inflexible, and require complex parameterization, struggling to balance rapid load changes in stationary operations with air-saving control in driving operations, while also being prone to mechanical wear and inadequate handling of disturbance variables.
Innovation Solution
A valve assembly comprising a proportional directional valve, a sensor for continuously detecting the carriage body's distance from the undercarriage, and a digital control device that generates control variables as a linear function of the control deviation and carriage body traveling speed, allowing for simple and dynamic control of air suspension levels without complex parameterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a purely mechanical valve control assembly is used, then the structure is relatively simple, but the control behavior is inflexible and cannot respond rapidly to load changes
Solution Approach 1:
The patent replaces the purely mechanical valve control assembly with an electropneumatic proportional valve controlled by a microprocessor. The mechanical rod and lever are retained only as a backup or supplementary mechanism. This substitution enables electronic control of the valve opening based on sensor feedback, achieving rapid response to load changes while maintaining structural simplicity through the integration of electronic control components.
2Speed
If control electronics with height sensors are used, then rapid control response is achieved, but the system becomes structurally complex and requires complex parameterization
Solution Approach 1:
The patent employs a single microprocessor that performs multiple functions: processing sensor signals, determining control deviations, calculating proportional valve opening degrees, and controlling the electropneumatic valve. This multi-functional approach consolidates what would otherwise require separate control components, reducing structural complexity while maintaining rapid response capability through integrated electronic control.
3Adaptability or versatility
If additional control valves or switching means are added to throttle air exchange, then control flexibility is improved, but the system becomes structurally complex and requires larger installation space
Solution Approach 1:
The patent uses a single electropneumatic proportional valve with continuously adjustable opening degree controlled by a microprocessor. This dynamic control mechanism replaces the need for multiple discrete control valves or switching means. The proportional valve can be continuously adjusted to throttle air exchange to any desired degree, providing equivalent or superior control flexibility with simpler structure and smaller installation space requirements.
4Device complexity
If mechanical actuation via rod and lever is used, then the valve can be actuated without complex electronics, but mechanical wear occurs and control precision is limited
Solution Approach 1:
The patent replaces the primary actuation mechanism with an electropneumatic proportional valve controlled by electronic signals from a microprocessor. This eliminates the mechanical rod and lever actuation that causes wear. The electronic control system provides precise control of the valve opening degree without mechanical contact, significantly reducing mechanical wear and improving reliability while maintaining simplicity in the control logic.
Data Source
AI summary
The disclosure relates to a valve assembly and a method for controlling the air suspension level of a rail vehicle. A system is provided, which is constructionally simple to build and easy to parameterise, for controlling the air suspension level of a rail vehicle. The object of the disclosure is achieved by a valve assembly for controlling the air suspension level of a rail vehicle, comprising a proportional directional valve, a sensor means for continuously detecting a distance variable representing the distance of a carriage body from a chassis or bogie of the rail vehicle, and a digital control device, wherein the control device is designed to be programmable for determining a control deviation based on the actual distance detected by the sensor means and a comparison with a predefinable target distance, and for continuously generating control variables as a linear function of the determined control deviation and the carriage body travelling speed. The object is also achieved by a method for controlling the air suspension level of a rail vehicle with a proportional directional valve, a sensor means for continuously detecting a distance variable representing the distance of the carriage body from a chassis or bogie, and a digital control device, wherein a control deviation is determined by the control device based on a comparison of the actual distances detected by the sensor means with a predefinable target distance, and a control variable is generated continuously as a linear function of the determined control deviation and the carriage body travelling speed.