Braking Acquisition Chain Calibration for Pressure Drift Compensation
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Solution Overview
Problem
The existing calibration methods for pneumatic braking systems are inadequate for electropneumatic systems, as they fail to maintain the required precision due to wear, vibrations, temperature fluctuations, and sensor drift, leading to inaccurate braking performance.
Innovation Solution
A calibration method that measures a predetermined reference value using a calibration means with higher accuracy, determines measurement errors in the acquisition chain, and modifies transfer function coefficients to minimize errors, ensuring precise braking pressure in electropneumatic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration of pneumatic components is used, then braking accuracy can be maintained initially, but measurement precision deteriorates over time due to wear, vibrations, and temperature fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the actual braking cylinder pressure is continuously measured by sensors and compared with the target pressure. The control system automatically adjusts the pressure by controlling the supply and exhaust of compressed air based on the deviation detected, thereby maintaining measurement precision and braking accuracy over time despite environmental changes and component wear.
2Weight of stationary object
If electropneumatic systems are used to reduce weight and volume, then system compactness is improved, but measurement precision deteriorates due to sensor drift and electronic component variations
Solution Approach 1:
The control system continuously monitors the braking cylinder pressure using sensors and automatically adjusts the pressure by controlling the electropneumatic components. This feedback loop compensates for sensor drift and electronic component variations, maintaining measurement precision despite the use of lightweight electropneumatic systems.
Solution Approach 2:
The patent replaces traditional mechanical pressure regulation mechanisms with electropneumatic components controlled by electronic sensors and control units. This substitution reduces weight and volume while maintaining or improving measurement precision through electronic feedback control, provided that sensor calibration and drift compensation are properly implemented.
3Reliability
If stricter braking accuracy requirements are imposed, then braking safety is improved, but device complexity increases due to additional calibration and control requirements
Solution Approach 1:
The patent implements a feedback control system that automatically maintains braking cylinder pressure within the strict +/â100 mbar tolerance range. The control unit continuously monitors pressure deviations and adjusts the electropneumatic components accordingly, ensuring braking safety without requiring complex manual calibration procedures for each component.
Solution Approach 2:
The braking system performs self-calibration and self-adjustment through the feedback control mechanism. The control unit automatically compensates for pressure deviations caused by component wear, sensor drift, or environmental changes, reducing the need for external calibration interventions and simplifying maintenance while maintaining strict accuracy requirements.
Data Source
AI summary
A method is described for calibrating an acquisition chain of a braking device or system of at least one vehicle, in particular at least one railway vehicle, which method includes the steps of:a) measuring a predetermined reference value of a physical quantity by means of a calibration means having a degree of accuracy greater than a predetermined threshold;b) measuring the predetermined reference value of the physical quantity by means of the acquisition chain;c) determining a measurement error therebetween; andd) modifying the at least one coefficient of said transfer function of control means of the acquisition chain, on the basis of the comparison of the value measured by the calibration means with the value measured by the acquisition chain, so that the measurement error of the acquisition chain is minimized or rendered null.