Measurement and calculation method for detecting CO32-hourly pH value sudden change point of railway battery

Abstract

The invention relates to the technical field of CO32-concentration detection of railway batteries and in particular relates to a measurement and calculation method for detecting a CO32-hourly pH valuesudden change point of a railway battery based on a potentiometric titration method. The method comprises the following steps: by adopting a smoothing filtering design, recording an effective sampling value by virtue of a moving average filtering algorithm, solving a first-order differential equation on the recorded data, judging consistency between data on two certain sides and slope change of the point, and preliminarily screening feature points with basic sudden change point features; and judging consistency of the slope change nearby the sudden change point by adopting a dot spacer judgment method, further screening the feature points, filtering all misguide points with fluctuation and interference nearby the sudden change points, and judging variation trend around the sudden change point so as to extract three sudden change point positions. According to the method disclosed by the invention, the basic features of the original data are saved, the condition that the slope change consistency is influenced by data jump is eliminated, the sudden change point can be rapidly and accurately extracted, and the measurement and calculation accuracy problem during CO32-concentration detection of the railway battery is effectively solved.

Description

technical field [0001] The present invention relates to railway accumulator CO 3 2- The technical field of concentration detection, more specifically, relates to a method based on potentiometric titration to detect railway battery CO 3 2- The determination and calculation method of the sudden change point of pH value in the concentration process. Background technique [0002] In the E3 repair program of the "Regulations for the Maintenance of Electrical Equipment of Railway Passenger Cars", it is clearly stipulated that the content of carbonate in the battery needs to be calculated by the amount of acid-base titration. The manual titration method is to measure 5mL electrolyte solution from the sample electrolyte solution, put it in a conical flask, add an appropriate amount of distilled water without carbon dioxide and 2 drops of 1% phenolphthalein indicator solution, titrate with 1 M hydrochloric acid standard solution until the red color disappears, and then Add 2 drop...

AI Technical Summary

Problems solved by technology

[0008] ① The data changes on both sides of the first-order differential data mutation point sometimes fluctuate, and the fluctuation amplitude is relatively large;

[0009] ②The first-order differential data will appear fluctuations near the mutation point, and the amplitude of the fluctuations is relatively large;

[0012] Based on this, it is necessary to invent a method based on potentiometric titration to detect railway battery CO 3 2- The determination and calculation method of the sudden change point of pH value in the concentration process to solve the problem of railway battery CO 3 2- Accuracy of numerical calculation of concentration detection to improve battery CO 3 2- Concentration detection accuracy

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