Rail Vehicle Brake Control Device Adhesion Feedback
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Solution Overview
Problem
Conventional brake systems for rail vehicles assume a constant adhesion coefficient, leading to suboptimal braking force application and longer braking distances, as they do not accurately account for varying adhesion conditions between the wheel and rail, particularly at higher speeds.
Innovation Solution
A brake control device that determines the actual coefficient of adhesion between the wheel and rail, calculates a braking target value based on this measurement, and controls the friction braking device to apply the optimal braking force, thereby maximizing braking efficiency without wheel locking or sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a constant adhesion coefficient is assumed in conventional brake systems, then the brake control system is simple to implement, but the braking distance increases and braking efficiency decreases due to inaccurate braking force application
Solution Approach 1:
The patent implements a feedback mechanism by continuously measuring the actual adhesion coefficient between wheel and rail using sensors, and using this measured value to dynamically adjust the braking force. The brake control device receives actual adhesion coefficient values, compares them with预设 values, and adjusts the braking force accordingly, creating a closed-loop control system that optimizes braking performance while maintaining reasonable system complexity
Solution Approach 2:
The patent replaces the conventional mechanical assumption of constant adhesion coefficient with an electronic/sensor-based measurement system. Instead of relying on fixed mechanical parameters, the system uses electronic sensors to detect actual adhesion conditions and processes this data electronically to control the braking mechanism, thereby reducing braking distance without excessive complexity increase
2Productivity
If braking force is increased to reduce braking distance, then braking efficiency improves, but the risk of wheel locking or sliding increases when adhesion conditions are poor
Solution Approach 1:
The patent applies dynamics by making the braking force adaptive rather than static. The brake control device continuously adjusts the braking force based on real-time adhesion coefficient measurements. When adhesion is high, braking force is increased to improve efficiency; when adhesion is low, braking force is reduced to prevent wheel locking, creating a dynamic response that simultaneously optimizes both braking efficiency and reliability
Solution Approach 2:
The patent changes the parameter of braking force based on the measured adhesion coefficient. Instead of applying a fixed braking force, the system varies the braking force parameter according to actual adhesion conditions. This parameter adaptation allows the system to maximize braking efficiency under good adhesion conditions while maintaining reliability under poor adhesion conditions by preventing wheel locking
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 solution enables precise regulation of braking force, ensuring safe and quick braking by maximizing the effective braking force transmission between the wheel and rail, reducing the risk of wheel locking or sliding and minimizing braking distance.
Implementation Method 1
A friction brake device can generally be, in particular, a so-called adhesion-dependent friction brake device which, during braking, transmits a braking force generated by friction via wheel-rail contact
Data Source
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AI summary
The invention relates to a brake control device (12) for rail vehicles, said device (12) comprising a friction brake device (14) and being designed to determine an actual adhesion coefficient between a wheel (22) of the rail vehicle and a rail (24) that is in contact with the wheel (22). The brake control device (12) is further designed to calculate a target braking value on the basis of the actual adhesion coefficient and to actuate the friction brake device (14) on the basis of the target braking value, in order to brake at least one wheel (22) that is to be braked by said friction brake device (14). The invention also relates to a brake system (10) comprising a brake control device (12) of this type, to a method for controlling a braking process and a corresponding computer programme product.