Urea injection amount control method and system and vehicle

A technology of urea injection and control method, which is applied in the field of vehicles and can solve the problems of excessive vehicle emissions and the like

Active Publication Date: 2021-08-17
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the invention is to at least solve the pro

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  • Urea injection amount control method and system and vehicle
  • Urea injection amount control method and system and vehicle

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[0039] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] It should be understood that terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may also be meant to include the plural forms unless the context clearly dictates otherwise. The terms "comprising", "comprising", "containing" and "having" are inclusive and thus indicate the presence of stated fea...

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Abstract

The invention belongs to the technical field of vehicles, and particularly relates to a urea injection amount control method and system and a vehicle. The urea injection amount control method comprises the following steps that the working condition of the vehicle is estimated according to road condition information and vehicle information; the NOx pre-emission amount is calculated according to the working condition of the vehicle; and the NOx pre-emission amount is compared with a pre-calibrated NOx emission threshold value, and whether the urea injection amount is corrected or not is judged. According to the urea injection amount control method, firstly, the working condition of the vehicle is estimated according to the road condition information in front of the vehicle, then the NOx pre-emission amount is calculated in advance according to the working condition, the NOx pre-emission amount is compared with the pre-calibrated NOx emission threshold value, whether the urea injection amount is corrected or not is further judged, therefore, the urea injection amount corresponding to the road condition is calculated before the vehicle reaches the changed road condition, the urea injection amount is controlled in time, vehicle emission is reduced, and it is guaranteed that the vehicle emission does not exceed the standard.

Description

technical field [0001] The invention belongs to the technical field of vehicles, and in particular relates to a method and system for controlling the injection amount of urea, and a vehicle. Background technique [0002] The control system of urea injection volume is an important part of the vehicle. The control system of urea injection volume is mainly used to properly treat the exhaust gas discharged from the engine of the vehicle to reduce the pollutant content in the exhaust gas, thereby reducing its pollution to the environment. . [0003] Most of the existing control methods of urea injection quantity are calculated and controlled based on the upstream NOx emission of the post-processor system. This method is suitable for vehicles driving on roads with constant road conditions. The operating conditions of the vehicle change, and the amount of NOx emissions upstream of the after-processor system fluctuates greatly. This control method is difficult to adjust the amount ...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N3/20
CPCF01N9/00F01N9/005F01N3/208Y02T10/12Y02T10/40Y02A50/20
Inventor 张涛梁昌水王树森曹原丁保安
Owner WEICHAI POWER CO LTD
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