Rail Vehicle Friction Control via Temperature Regulation
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Solution Overview
Problem
Existing anti-skid and anti-skid devices in rail vehicles fail to fully transmit desired drive and braking forces due to low frictional connections, leading to wheel skidding or sliding, increased wear, and damage to the drive system, especially under conditions like moisture on the rail.
Innovation Solution
A method and control device that regulate driving and braking forces by controlling the frictional connection between the wheel and rail by adjusting the temperature of the friction partners, determining the necessary friction power based on temperature variables and speed values to optimize the frictional connection and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing anti-skid and anti-skid devices are used to control wheel slip and slide, then wheel skidding and sliding are prevented, but the desired drive and braking forces cannot be fully transmitted due to low frictional connection
Solution Approach 1:
The invention changes the physical parameter of temperature of the friction partners (wheel and rail) to improve the frictional connection. By controlling the temperature through friction power input, the system optimizes the friction coefficient between wheel and rail, enabling full transmission of desired drive and braking forces while maintaining reliable slip prevention.
Solution Approach 2:
The system applies friction power in controlled periodic cycles to gradually increase the temperature of the friction partners. This periodic heating action allows the frictional connection to be optimized over time without causing excessive temperature rise, balancing force transmission improvement with thermal management.
2Force
If friction power is increased to improve frictional connection, then drive and braking force transmission is improved, but temperature of friction partners increases which may cause material damage
Solution Approach 1:
The system incorporates feedback control by monitoring the temperature of the friction partners and adjusting the friction power input accordingly. When the temperature approaches material boundary limits, the system reduces or stops friction power application, preventing thermal damage while maintaining optimal frictional connection during safe temperature ranges.
Solution Approach 2:
The system applies friction power in gradual, controlled increments rather than sudden large increases, allowing the friction partners to adapt thermally. This progressive heating approach cushions against thermal shock and prevents excessive temperature rise that could cause material damage, while still improving the frictional connection.
3Force
If temperature of friction partners is increased to optimize friction potential, then frictional connection is improved, but wear and damage to wheel and rail increases
Solution Approach 1:
The system continuously monitors temperature and provides feedback control to prevent excessive heating. By maintaining temperature within optimal but safe ranges, the system maximizes friction potential while avoiding the thermal conditions that lead to increased wear and material damage to the wheel and rail.
Solution Approach 2:
The system optimizes the temperature parameter within a controlled range that maximizes friction potential without reaching thresholds that cause material degradation. By precisely controlling temperature as a physical parameter, the system achieves improved frictional connection while preventing wear and damage.
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
This approach enhances the frictional connection between the wheel and rail, allowing for improved transmission of drive and braking forces, reducing wear and damage, and ensuring safe operation by maintaining the material boundaries of the wheel and rail.
Implementation Method 1
the frictional connection between wheel and rail represents a measure of the available braking or driving force
Implementation Method 2
a friction power is set in such a way that a predetermined temperature value of the friction partners is reached to influence the frictional connection
Data Source
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AI summary
The invention relates to a method for controlling the driving and braking force of a vehicle, particularly of a rail vehicle, having at least two friction elements, particularly a wheel (2) and a running surface (4), wherein a value corresponding to the driving or braking force FSoIl is determined from at least one predetermined or determined temperature value dTempSoll and a determined speed value for regulating or controlling the driving or braking force, and a regulating device (16) for controlling the driving and braking force, and to a vehicle having at least one such regulating device.