Injection control method, device and electronic equipment for urea injection system

By triggering the air-driven pressure build-up process of the urea tank immediately after the vehicle engine starts, and combining the liquid circuit pressure and temperature signals to identify the urea thawing status in real time, the problem of long pressure build-up time of the urea system is solved, realizing rapid and precise control of the urea injection system and improving the cold start emission performance of the SCR system.

CN122106724APending Publication Date: 2026-05-29FAW JIEFANG AUTOMOTIVE CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FAW JIEFANG AUTOMOTIVE CO
Filing Date
2026-03-06
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In low-temperature environments, urea solution is prone to freezing and forming solid crystals, which can lead to malfunctions such as pipeline blockage, dry running of the injection pump, and jamming of the metering valve, affecting the emission performance of the SCR system during the cold start phase. In existing technologies, the pressure build-up time of urea systems is relatively long and the thawing status of urea cannot be accurately determined.

Method used

By triggering the air-driven pressure building process of the urea tank immediately after the vehicle engine starts, and controlling the injection of compressed gas into the urea tank according to the target filling time, the urea thawing state is identified in real time by combining the liquid circuit pressure and temperature signals, so as to achieve rapid and accurate establishment of air pressure in the urea tank, dynamically identify the abnormal pressure characteristics of urea changing from solid to liquid state, and ensure real-time and accurate judgment of urea injection.

Benefits of technology

It significantly shortens the pressure build-up time of the urea tank, eliminates the pressure build-up start-up lag of the urea system, ensures the emission performance of the urea injection system during the cold start phase, avoids injection failures caused by thawing delay, and improves the real-time response and injection accuracy of the SCR system.

✦ Generated by Eureka AI based on patent content.

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    Figure CN122106724A_ABST
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Abstract

The application discloses a urea injection system injection control method, device and electronic equipment. Wherein, the method comprises: in response to the engine starting of the vehicle, and the pressure of the compressed gas cylinder in the vehicle reaching the pressure threshold, triggering the pressure building instruction of the urea tank; according to the target inflation time length, controlling the compressed gas in the compressed gas cylinder to inject into the urea tank; in response to the liquid path pressure signal in the urea tank after injection and the urea temperature meeting the preset condition, triggering the urea injection setting signal; based on the liquid path pressure change curve in the urea tank and the preset liquid path pressure change curve corresponding to the urea tank, triggering the urea thawing signal in the urea tank; in response to the urea thawing signal indicating that the urea thawing in the urea tank is completed, and the interval time length between the time when the urea thawing signal is triggered and the time when the urea tank pressure building is completed is less than or equal to the preset time length, controlling the urea tank to inject urea. The application solves the technical problem that the pressure building time length of the urea system in the related art is long.
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