Method and device for controlling urea injection

A technology of urea and injection volume, which is applied to the electronic control of mufflers, exhaust devices, and exhaust treatment devices, and can solve the problems of low accuracy and adaptability of the SCR system

Active Publication Date: 2020-05-08
BEIQI FOTON MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method and device for controlling urea injection
  • Method and device for controlling urea injection
  • Method and device for controlling urea injection

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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 invention relates to a method and device for controlling urea injection, and relates to the technical field of vehicle control. The method and the device are applied to a vehicle on which an SCR system is arranged, and the method comprises the steps that the actual nitrogen-oxygen emission quantity measured by a nitrogen-oxygen sensor is acquired, specifically, the nitrogen-oxygen sensor is arranged at the downstream of the SCR system; if working parameters at the current moment and the SCR system all meet the control condition, a control coefficient is determined according to the workingparameters and an emission quantity deviation, specifically, the emission quantity deviation is the difference between the actual nitrogen-oxygen emission quantity and an target nitrogen-oxygen emission quantity, and the target nitrogen-oxygen emission quantity is determined according to a preset basic nitrogen-oxygen emission quantity of the vehicle; and the product of a basic injection quantityand the control coefficient is taken as an actual injection quantity, and the SCR system is controlled to inject an urea solution according to the actual injection quantity, specifically, the basic injection quantity is determined according to the basic nitrogen-oxygen emission quantity and the working parameters. According to the method and the device, the injection quantity of the SCR system isadjusted in real time according to the actual nitrogen-oxygen emission quantity at the downstream of the SCR system, and the accuracy and adaptability of the SCR system can be improved.

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 Applications(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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