Railway Air Spring Tilting Control for Curve Centrifugal Balance
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Solution Overview
Problem
Railway vehicles experience discomfort and potential overturning due to insufficient superelevation on curved tracks, leading to unbalanced centrifugal forces, which traditional tilting systems with complex secondary suspensions are unable to effectively address.
Innovation Solution
A tilting system for railway vehicles utilizing sensors, air springs, and electromagnetic proportional flow valves to adjust the height difference between left and right air springs, controlled by a controller to balance centrifugal forces through tilting, employing feedforward and feedback control mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional tilting systems with complex secondary suspension structures are used, then tilting function is achieved, but system complexity increases and reliability decreases
Solution Approach 1:
The patent extracts the tilting function from the complex secondary suspension structure and implements it independently through air springs. The air springs are connected directly to the car body and bogie frame, eliminating the need for complex mechanical tilting mechanisms in the secondary suspension while achieving the same tilting effect.
Solution Approach 2:
The patent uses air springs (pneumatic elements) to achieve the tilting function. By controlling the air pressure and volume in the air springs, the system can adjust the height and tilt angle of the car body, replacing complex mechanical structures with pneumatic actuation.
2Object-affected harmful factors
If superelevation of outer rail is increased to balance centrifugal force, then ride comfort improves, but natural conditions during railway laying constrain the maximum superelevation
Solution Approach 1:
The patent implements dynamic tilting control where the air springs can adjust the car body tilt angle in real-time based on operating conditions. The system responds to curvature radius, speed, and acceleration inputs to dynamically adjust the tilting degree, allowing adaptation to various curve conditions beyond fixed rail superelevation limits.
Solution Approach 2:
The system changes the physical parameters of the air springs (pressure, volume, height) to achieve tilting. By adjusting these parameters, the car body can tilt at different angles to compensate for centrifugal force on curves of various radii, providing adaptability that exceeds fixed rail superelevation capabilities.
3Object-affected harmful factors
If traditional tilting systems are used, then centrifugal force balance is achieved, but cost increases
Solution Approach 1:
The air springs serve multiple functions: they provide secondary suspension, enable car body tilting, and support height adjustment. This multi-functionality eliminates the need for separate tilting mechanisms, reducing component count and manufacturing cost while achieving centrifugal force balance.
Solution Approach 2:
The patent merges the tilting function with the existing air spring suspension system. Instead of adding a separate tilting mechanism, the control system utilizes the air springs' ability to adjust height and pressure to achieve both suspension and tilting functions through a unified 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
Effectively balances centrifugal forces on curved tracks, improving passenger comfort and reducing the risk of overturning by dynamically adjusting the tilting angle based on real-time acceleration data.
Implementation Method 1
a left air spring and a right air spring, wherein the left air spring communicates with a left auxiliary air chamber and the right air spring communicates with a right auxiliary air chamber
Implementation Method 2
a first three-position electromagnetic proportional flow valve and a second three-position electromagnetic proportional flow valve
Data Source
AI summary
A rail vehicle tilting system, comprising a controller (101), a high-pressure air cylinder (102), a left side air spring (105), a right side air spring (107), a left side additional air chamber (106), a right side additional air chamber (108), a first three-position electromagnetic proportional flow valve (109), a second three-position electromagnetic proportional flow valve (110), a sensor, a differential pressure valve (104) and a two-position switch valve (111). The left side air spring (105) is in communication with the left side additional air chamber (106); the right side air spring (107) is in communication with the right side additional air chamber (108); the sensor is used for collecting data of a rail vehicle during running, and transmitting the collected data to the controller (101); the controller (101) controls, according to data collected by the sensor, the first three-position electromagnetic proportional flow valve (109) and the second three-position electromagnetic proportional flow valve (110); the differential pressure valve (104) is used for enabling the left side additional air chamber (106) to be in communication with the right side additional air chamber (108); and the two-position switch valve (111) is respectively in communication with the left side additional air chamber (106) and the right side additional air chamber (108) by means of pipelines. Also disclosed are a rail vehicle tilting control method and a rail vehicle.