Pneumatic Tilting System with Seismic Mass Valve Control
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Solution Overview
Problem
Conventional passenger railway vehicle tilting systems face challenges in compensating lateral acceleration during curves, leading to passenger discomfort, and existing solutions are either complex and costly or inefficient due to slow response times of pneumatic suspension systems.
Innovation Solution
A pneumatic tilting system incorporating a mechanical device with a rotating part and seismic mass or pendulum to control pneumatic spring flow, allowing for faster response and compensation of lateral acceleration, thereby reducing passenger discomfort without adding complexity to the bogie or body design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional leveling valves are used to control pneumatic spring pressure, then the system structure remains simple, but the response time is too slow to compensate for lateral acceleration during curves
Solution Approach 1:
The patent applies the dynamics principle by making the valve flow dynamic rather than static. The valve flow area varies automatically according to the tilting angle of the vehicle body, allowing the system to adapt its response characteristics to different operating conditions. This dynamic adjustment enables fast response during curves while maintaining simplicity in straight-line operation.
Solution Approach 2:
The system employs self-service through the automatic coupling between the tilting angle sensor and the valve flow control. The control unit automatically adjusts the valve opening based on the detected tilting angle without requiring manual intervention or complex external control systems. The pneumatic spring itself provides the feedback mechanism through its pressure changes.
2Reliability
If passive tilting with high center of gravity is used to achieve natural pendulation, then tilting compensation is achieved, but the body and bogie design becomes much more complex due to gauge problems
Solution Approach 1:
The patent replaces the mechanical passive tilting system with a pneumatic control system. Instead of relying on the mechanical arrangement of the center of gravity and natural pendulation, the system uses pneumatic springs with controllable flow to actively manage the tilting compensation. This substitution eliminates the need for complex mechanical redesign of the body and bogie structures.
3Speed
If active tilting with actuators between body and bogie is implemented to achieve controlled inclination, then up to 8° of tilting is achieved, but the system complexity and cost increase enormously
Solution Approach 1:
The patent applies universality by making the existing pneumatic suspension system serve dual functions: both supporting the vehicle body and controlling the tilting motion. The same pneumatic springs that provide suspension also enable tilting compensation when their flow is dynamically controlled. This eliminates the need for separate active tilting actuators and reduces system complexity.
Solution Approach 2:
The system merges the height control function and tilting control function into a single integrated pneumatic system. By combining these functions, the patent eliminates the need for separate actuator systems and complex control mechanisms, achieving tilting compensation using the existing suspension infrastructure.
4Speed
If high-flow leveling valves are used to fill and empty pneumatic springs quickly, then response speed improves, but the valves create an opposite effect to natural rolling when activated during curves
Solution Approach 1:
The patent applies dynamics by making the valve flow area variable rather than fixed. The valve opening is dynamically adjusted based on the tilting angle, allowing the system to provide high flow rates when needed for rapid response while maintaining appropriate flow characteristics during normal operation. This prevents the destabilizing effect of constant high-flow valves.
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 effectively compensates for lateral acceleration, reducing passenger discomfort and maintaining a stable ride by dynamically adjusting pneumatic spring pressure, thus enhancing the tilting performance without increasing system complexity or costs.
Implementation Method 1
The suspension is formed by two pneumatic springs per bogie... such that said pneumatic springs give rise to vertical rigidity of the suspension
Implementation Method 2
allowing for faster response and compensation of lateral acceleration... incorporating a mechanical device with a rotating part and seismic mass or pendulum
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3C
AI summary
The invention relates to a controlled pneumatic tilting system in railway vehicles, with pneumatic springs (1.1, 1.2) for controlling the height of the body (4) with respect to the bogie (2), having opening and shut-off valves (7.1, 7.2) for said pneumatic springs, which incorporate a mechanical device formed by a rotating part (8.1, 8.2) and a seismic mass (9.1, 9.2), such that when the vehicle enters a curve said mechanical devices act on the valves which, due to the action of the pneumatic springs, makes the body (4) tilt in the direction opposite to the lateral acceleration.