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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

Active Publication Date: 2021-06-18
BEIQI FOTON MOTOR CO LTD
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Problems solved by technology

[0004] The purpose of this disclosure is to provide a control method and device for injecting urea to solve the problems of low accuracy and adaptability of the SCR system existing in the prior art

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  • Control method and device for injecting urea
  • Control method and device for injecting urea
  • Control method and device for injecting urea

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Embodiment Construction

[0056] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatuses and methods consistent with aspects of the present disclosure as recited in the appended claims.

[0057] Before introducing the method and device for controlling urea injection provided by the present disclosure, the application scenarios involved in the various embodiments of the present disclosure will be introduced first. The application scenario may be a vehicle using a diesel engine, and an SCR system is provided at an outlet of the diesel engine. The vehicle may be a transpo...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N2560/026F01N2570/14F01N2610/02Y02T10/12Y02T10/40Y02A50/20
Inventor 杨新春
Owner BEIQI FOTON MOTOR CO LTD
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