Control method and device for injecting urea

A technology of urea and injection quantity, applied in the direction of exhaust device, muffler device, electronic control of exhaust gas treatment device, etc., can solve the problems of low accuracy and adaptability of SCR system, and achieve the effect of improving accuracy and adaptability
CN111120053BActive Publication Date: 2021-06-18BEIQI FOTON MOTOR CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIQI FOTON MOTOR CO LTD
Publication Date
2021-06-18

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Abstract

The disclosure relates to a control method and device for injecting urea, relates to the technical field of vehicle control, is applied to a vehicle, and the vehicle is equipped with an SCR system. In the downstream of the SCR system, if the current working parameters and the SCR system meet the control conditions, the control coefficient is determined according to the working parameters and the emission deviation, and the emission deviation is the difference between the actual nitrogen and oxygen discharge and the target nitrogen and oxygen discharge. The target nitrogen and oxygen emission is determined according to the preset basic nitrogen and oxygen emission of the vehicle. The product of the basic injection quantity and the control coefficient is used as the actual injection quantity, and the SCR system is controlled to inject urea solution according to the actual injection quantity. The basic injection quantity is based on the basic nitrogen and oxygen emission. Emissions and operating parameters are determined. The disclosure adjusts the injection quantity of the SCR system in real time according to the actual nitrogen and oxygen emission downstream of the SCR system, and can improve the accuracy and adaptability of the SCR system.
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Description

technical field

[0001] The present disclosure relates to the technical field of vehicle control, in particular, to a control method and device for urea injection. Background technique

[0002] Diesel engines are widely used in various vehicles because of their good economy and power, but because the exhaust gas generated by diesel engines when burning diesel contains nitrogen oxides (NOx), which will cause environmental pollution, it is necessary to use diesel engines A purification device is installed at the exhaust port to reduce nitrogen oxides in the exhaust gas. The purification device is usually an SCR (English: Selective Catalytic Reduction, Chinese: Selective Catalytic Reduction) system. The SCR system sprays urea solution and uses the heat in the exhaust gas to decompose the urea solution into ammonia gas, and then uses ammonia gas as the reducing agent. , reducing nitrogen oxides to nitrogen and water, thereby reducing nitrogen oxides in the exhaust gas.

[0003] ...

Claims

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