A kind of control method of urea pump and engine aftertreatment system

A control method and urea pump technology, applied in engine components, combustion engines, machines/engines, etc., can solve the problems that affect the normal use of users, do not consider retention, vehicle torque limit, etc., to reduce the risk of urea crystallization and shorten the time. Interval, the effect of optimizing the user experience

Active Publication Date: 2022-07-15
WEICHAI POWER CO LTD +1
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  • Description
  • Claims
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Problems solved by technology

This control method does not take into account that when the temperature is high in summer, a part of the liquid is reserved in the connecting pipeline to reduce the risk of crystallization, and the crystallization of the urea solution will lead to excessive discharge and crystallization of the SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) box, which will cause The torque limit of the vehicle will affect the normal use of the user

Method used

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  • A kind of control method of urea pump and engine aftertreatment system
  • A kind of control method of urea pump and engine aftertreatment system

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Embodiment Construction

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element mu...

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Abstract

The invention discloses a control method of a urea pump and an engine aftertreatment system, and relates to the technical field of catalytic reduction of engine exhaust gas. The control method of the urea dosing pump includes the following steps: after the vehicle is powered off, obtain the minimum ambient temperature in the environment where the vehicle is located within a preset time in the future; determine whether the minimum ambient temperature is greater than or equal to a threshold, and if so, stop the vehicle. In the control method of the urea dosing pump provided by the present invention, when the obtained minimum ambient temperature is greater than or equal to the threshold value, it indicates that there is no risk of freezing in the connecting pipeline, and the urea dosing pump is controlled to skip sucking back and stop directly. The control method of the urea pump can not only keep the connecting pipeline moist and reduce the risk of urea crystallization, but also shorten the time interval from the power off to the shutdown of the vehicle, and optimize the user experience.

Description

technical field [0001] The invention relates to the technical field of catalytic reduction of engine exhaust gas, in particular to a control method of a urea pump and an engine aftertreatment system. Background technique [0002] The post-processing urea supply system of vehicle diesel engine is mainly composed of urea tank, urea pump, reverse valve and connecting pipeline. After the vehicle is powered off and stopped, the reverse valve is opened to release the pressure to reduce the pressure of the urea solution in the connecting pipeline to below the set value, and then the urea pump reverses and sucks the urea solution back into the urea tank. [0003] However, studies have shown that, at a suitable temperature, keeping the inner wall of the connecting pipeline moist can reduce the risk of urea crystallization in the connecting pipeline. Therefore, when the temperature is higher in summer, keeping a part of the liquid in the connecting pipeline can reduce the risk of cry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N9/00F01N2610/02F01N2610/1486Y02T10/40
Inventor 赵杰王金平王毓源徐文双侯郭顺
Owner WEICHAI POWER CO LTD
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