Electromechanical Anti-Skid Braking With Independent Force Supervision
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Solution Overview
Problem
Existing anti-skid systems for pneumatic railway braking systems are not applicable to electromechanical braking systems due to structural differences, and there is a risk of permanent undue reduction in braking force from hardware or software failures.
Innovation Solution
An anti-skid system for electromechanical braking systems that includes a supervisor module to monitor and adjust braking force application requests, using software functions to ensure compliance with safety standards, independent from the anti-skid module, and incorporating time-out modules to prevent prolonged braking force reductions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an anti-skid system is implemented in an electromechanical braking system, then wheel skidding is prevented and braking safety is improved, but the complexity of the system increases due to the need for supervisor modules and independent monitoring functions
Solution Approach 1:
The anti-skid system is divided into functionally independent modules: an anti-skid module that executes the anti-skid function, and a supervisor module that independently monitors the anti-skid module. This segmentation allows each module to be optimized for its specific function while maintaining overall system reliability through independent verification.
Solution Approach 2:
The supervisor module acts as an intermediary between the anti-skid module and the braking force application request signal. It receives signals from both sources, compares them, and determines whether to authorize the anti-skid force reduction, thereby mediating the conflict between anti-skid functionality and braking performance.
2Reliability
If the anti-skid module reduces braking force to prevent wheel skidding, then wheel damage is avoided, but the braking performance is temporarily degraded
Solution Approach 1:
The supervisor module performs preliminary verification by checking whether the anti-skid force reduction request is authorized before allowing the anti-skid module to reduce braking force. This preliminary check ensures that force reduction only occurs when necessary and appropriate, minimizing the impact on braking performance.
Solution Approach 2:
The supervisor module continuously monitors the anti-skid module's actions and compares them against the braking force application request signal. This feedback mechanism ensures that any deviation from expected braking performance is detected and corrected, maintaining optimal braking performance while preventing wheel skidding.
3Reliability
If hardware or software failures cause permanent undue reduction in braking force, then system reliability is compromised, but adding redundant monitoring systems increases device complexity
Solution Approach 1:
The supervisor module performs self-verification by independently checking the anti-skid module's actions against the braking force application request signal. This self-service monitoring mechanism detects and corrects failures without requiring external intervention, maintaining braking force consistency while avoiding the need for additional complex external monitoring systems.
Data Source
AI summary
An anti-skid system for an electromechanical braking system of at least one vehicle including at least one wheel is described, comprising an anti-skid module arranged to execute a predetermined anti-skid function and a supervisor module arranged to monitor the anti-skid module, wherein the supervisor module includes a braking force application request adjustment module, wherein the supervisor module and the anti-skid module are modules that are distinct from each other, and the braking force application request adjustment module is arranged to adjust a braking force application request signal independently of the execution of the anti-skid function by the anti-skid module.