Dynamic Threshold Brake Control for Consistent Response Time
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Solution Overview
Problem
The existing brake control apparatus for railroad cars maintains a constant threshold value for air pressure control, leading to inconsistent air charging rates and response times when target air pressures differ, resulting in varying brake response times across different situations.
Innovation Solution
A brake control apparatus with a mode selector that adjusts threshold values based on target air pressure, allowing for dynamic control of charge and discharge valves to maintain consistent air pressure and response times across varying target pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant threshold value is used for air pressure control, then the control logic is simple, but the brake response time varies across different target pressure situations
Solution Approach 1:
The patent applies the dynamics principle by making the threshold value dynamic instead of constant. The threshold value is adjusted based on the target AC pressure, allowing the control system to adapt to different operating conditions. This resolves the contradiction by introducing variability in the threshold value to maintain consistent brake response time across different target pressure situations.
Solution Approach 2:
The patent changes the parameter of the threshold value from a fixed constant to a variable that depends on the target AC pressure. By establishing a relationship between the threshold value and target pressure, the system optimizes the charging quantity per unit time for each specific situation, thereby equalizing brake response times while maintaining relatively simple control logic.
2Loss of time
If the threshold value is adjusted according to target AC pressure, then brake response time is equalized, but the control system becomes more complex
Solution Approach 1:
The patent implements parameter changes by making the threshold value dependent on the target AC pressure. This allows the system to equalize brake response times across different pressure situations while keeping the control structure relatively simple through a systematic parameter adjustment approach.
Solution Approach 2:
The patent uses feedback by continuously monitoring the AC pressure deviation and comparing it with the dynamically adjusted threshold value. This feedback mechanism enables the system to automatically select appropriate control modes (charging, holding, or discharging) based on the current pressure state and target pressure relationship, achieving consistent response times without excessive complexity.
3Ease of manufacture
If threshold values are kept constant, then the control system is easier to implement, but the quantity of compressed air charged per unit time varies with target pressure
Solution Approach 1:
The patent changes the threshold value parameter from a fixed constant to a variable that adapts to different target AC pressures. This ensures that the quantity of compressed air charged per unit time is optimized for each specific target pressure situation, achieving consistent charging rates while maintaining ease of implementation through a systematic parameter adjustment approach.
Data Source
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AI summary
A brake control apparatus (1) is provided with: a target value input device (40) that accepts a target value for the output pressure of a charge valve/discharge valve as input; an actual value input device (41) that accepts an actual value of the output pressure of the charge valve/discharge valve as input; a deviation acquisition device (42) that acquires a deviation obtained by subtracting the target value from the actual value; a threshold value acquisition device (43) that acquires a threshold value for comparison with the deviation according to the target value; a mode selector (44) that selects a mode of opening and closing the charge valve/discharge valve by comparing the deviation and the threshold value; a command signal generator (45) that generates a command signal for controlling the charge valve/discharge valve according to the mode; and a command signal output device (46) that outputs the command signal to the charge valve/discharge valve.