A CAN bus urea quality sensor concentration correction system and its correction method

By using a CAN bus urea quality sensor concentration correction system and PID closed-loop compensation fitting to adjust the ultrasonic probe spacing, the problem of inconsistent ultrasonic probe spacing in mass production was solved, achieving high-precision urea concentration measurement and improving production efficiency.

CN122084741APending Publication Date: 2026-05-26SHANDONG AITECH ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG AITECH ENVIRONMENTAL PROTECTION TECH CO LTD
Filing Date
2026-03-16
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In mass production, existing urea quality sensors suffer from insufficient urea concentration measurement accuracy due to the inconsistent distance between the ultrasonic probe's emitting and reflecting surfaces. This affects the urea injection accuracy of the SCR system and can even lead to false alarms and engine torque limiting issues.

Method used

A CAN bus urea quality sensor concentration correction system is adopted. The distance between the probe's emitting surface and reflecting surface is adjusted by PID closed-loop compensation fitting. Combined with PID algorithm and CAN bus data interaction, accurate concentration measurement is achieved.

Benefits of technology

It improves the measurement accuracy of ultrasonic probes, reduces production calibration time, enhances product measurement accuracy and production efficiency, is suitable for mass production, and has good market promotion value and economic benefits.

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    Figure CN122084741A_ABST
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Abstract

A CAN bus urea quality sensor concentration correction system and method are disclosed. The CAN bus urea quality sensor concentration correction system includes a urea quality sensor body and a quality concentration probe disposed at the lower end of the urea quality sensor body. The quality concentration probe has a emitting surface and a reflective surface spaced apart from the emitting surface. The CAN signal interface of the urea quality sensor body is electrically connected to a USB-CAN analyzer via a CAN bus. The serial port of the USB-CAN analyzer is electrically connected to the serial port of a host computer. This invention corrects the distance between the emitting and reflective plates of the urea quality sensor through closed-loop compensation data fitting, making the urea concentration measured in a standard urea solution at room temperature more accurate. By integrating concentration measurement data under other temperature and concentration conditions through a large amount of experimental data, the measurement accuracy of the ultrasonic probe product is significantly improved. No additional components are required, and the correction speed is fast, exhibiting high correction accuracy and practicality.
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