Electro-pneumatic Braking Assembly with Dual Microprocessor Control
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Solution Overview
Problem
Existing railway vehicle braking systems face challenges in achieving precise and repeatable stopping distances due to the complexity and material variability of mechanical-pneumatic solutions, which are difficult to calibrate and result in varying safety integrity levels across different braking functions.
Innovation Solution
The implementation of an electro-pneumatic braking system with dual microprocessor control units that modulate solenoid valves to achieve precise pneumatic pressure control, allowing for software-based adjustments of braking characteristics and improved accuracy across temperature and time variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If purely mechanical-pneumatic solutions are used to execute emergency braking and safety braking functions, then safety integrity levels (SIL 3-4) can be reached and verified, but the precision and repeatability of stopping distances deteriorate due to material variability and complexity
Solution Approach 1:
The patent replaces purely mechanical-pneumatic braking control with an electro-pneumatic system featuring dual independent microprocessor control units that electronically control pneumatic valves. This substitution eliminates material variability issues (rubber diaphragms, sealing rings, springs) while maintaining SIL 3-4 safety integrity through redundant electronic control, thereby achieving both high reliability and precise stopping distance control
Solution Approach 2:
The patent changes the control parameters from mechanical pressure ratios to electronically controllable pneumatic pressure with software-based adjustments. The microprocessor units can precisely modulate braking pressure parameters and compensate for temperature variations, achieving repeatable stopping distances across different operating conditions while maintaining safety integrity levels
2Reliability
If mechanical-pneumatic solutions with springs and rubber diaphragms are used, then safety integrity levels can be achieved, but the accuracy of functional characteristics deteriorates due to material variability and temperature sensitivity
Solution Approach 1:
The patent substitutes mechanical sensing and control elements (springs, rubber diaphragms, sealing rings) with electronic sensors and microprocessor-based control systems. This eliminates the material variability and temperature sensitivity inherent in mechanical components, providing accurate functional characteristics measurement and control while maintaining SIL 3-4 safety integrity through redundant electronic architecture
Solution Approach 2:
The patent implements feedback control through microprocessor units that continuously monitor braking system parameters and adjust pneumatic valve control accordingly. This closed-loop feedback compensates for temperature variations and ensures accurate functional characteristics across the operating temperature range from -40°C to +70°C, while maintaining safety integrity levels
3Reliability
If complicated mechanical-pneumatic solutions are used to provide operating characteristics, then safety integrity levels can be reached, but the device complexity increases and calibration becomes difficult
Solution Approach 1:
The patent replaces complicated mechanical-pneumatic characteristic generation mechanisms with software-based control in dual microprocessor units. This substitution simplifies the physical device architecture while maintaining SIL 3-4 safety integrity, and enables easy calibration through software parameter adjustment rather than complex mechanical reconfiguration
Solution Approach 2:
The patent creates a universal electro-pneumatic braking control system where the dual microprocessor units can execute multiple braking functions (service braking, parking braking, safety braking, emergency braking, wheel slide protection) through software configuration. This multi-functional approach reduces overall system complexity compared to dedicated mechanical solutions for each function while maintaining required safety integrity levels
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 precision and repeatability of stopping distances during emergency and safety braking, reducing the complexity and cost associated with mechanical-pneumatic systems while maintaining or exceeding safety integrity levels.
Implementation Method 1
a solenoid valve arrangement (12, 13) and associated control system (15) for controlling a pneumatic pressure in a volume (11) of a brake cylinder
Implementation Method 2
electro-pneumatic assembly (10) for controlling the pneumatic pressure in a volume (11)
Data Source
AI summary
The assembly comprises a body wherein there are defined a chamber, a supply valve adapted to connect the chamber to a pressure source or to the atmosphere, and a vent valve adapted to allow or prevent the connection of the chamber to the atmosphere. The valves are provided with control solenoids to which respective electronic switches are coupled. The assembly also comprises electronic control devices adapted to provide, as a function of the values of at least one input signal, logic control signals to the electronic switches so as to control, through the valves, the value of the pressure in the chamber. The control means comprise two processing and control devices independent of one another, both receiving the input signal and designed to execute strategies for controlling the pressure in the chamber, equivalent to one another.