Method for improving response performance and detection precision of nitrogen-oxygen sensor

By introducing a preset optimal operating temperature threshold and dynamic temperature adjustment mechanism into the nitrogen oxygen sensor, combined with the NOx concentration algorithm of the O2 concentration compensation term, the problem of slow response speed and low measurement accuracy when facing the changes in NOx and O2 concentrations in the exhaust gas is solved, and more efficient NOx concentration detection and more stable measurement performance are achieved.

CN119715681APending Publication Date: 2025-03-28GUANGXI UNIV
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Patent Information

Application Number
CN202411649055.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

When faced with changes in NOx and O2 concentrations in exhaust gas, the existing nitrogen oxygen sensors have slow response speed and low measurement accuracy, making it difficult to completely eliminate the interference caused by exhaust gas changes in the first time, limiting their application potential in real-time and accurate monitoring.

Method used

By introducing preset optimal operating temperature threshold and dynamic temperature adjustment mechanisms into the nitrogen oxygen sensor, ensure that the sensor always maintains optimal operating conditions under different exhaust temperature conditions. In addition, the compensation term for O2 concentration is introduced into the NOx concentration algorithm to calculate the target NOx concentration, which improves the responsiveness and detection accuracy to NOx concentration.

Benefits of technology

The nitrogen oxygen sensor is realized to respond quickly to O2 concentration changes, improve the detection accuracy and response performance of NOx concentration, and enhance the environmental adaptability and measurement stability of the sensor under complex operating conditions.

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Abstract

The invention discloses a method for improving response performance and detection precision of a nitrogen-oxygen sensor, and relates to the nitrogen-oxygen sensor. When tail gas does not reach the position of the nitrogen-oxygen sensor, the initial working temperature of the nitrogen-oxygen sensor is adjusted to be a preset optimal working temperature threshold value; when the tail gas enters the nitrogen-oxygen sensor, the real-time working temperature of the nitrogen-oxygen sensor is dynamically adjusted according to the tail gas temperature of the tail gas and the initial working temperature, so that the real-time working temperature is the optimal working temperature threshold value; and after the tail gas enters the third chamber of the nitrogen-oxygen sensor, introducing a compensation item of O2 concentration into an NOx concentration algorithm which adopts a pump current value IP3 generated by an auxiliary pump of the nitrogen-oxygen sensor to linearly fit the NOx volume fraction, so as to calculate the target NOx concentration. According to the invention, the responsiveness and the detection precision of the nitrogen-oxygen sensor to the NOx concentration are improved, the overshoot phenomenon is avoided, the energy consumption is effectively reduced, and the service life of the sensor is prolonged.
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