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Control method of urea pump and engine aftertreatment system

A control method and urea pump technology, applied to engine components, combustion engines, machines/engines, etc., can solve problems such as not taking into account reservations, affecting normal use of users, vehicle torque limit, etc., to shorten time intervals and reduce urea crystallization Risk, the effect of optimizing user experience

Active Publication Date: 2021-09-07
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Control method of urea pump and engine aftertreatment system
  • 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, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures 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 drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a s...

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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 engine exhaust catalytic reduction. The control method of the urea pump comprises the following steps that after a vehicle is powered off, the lowest environment temperature of the environment where the vehicle is located in the future preset time is obtained; and whether the lowest environment temperature is larger than or equal to a threshold value or not is judged, and if yes, the vehicle is stopped. According to the control method of the urea pump, when the obtained lowest environment temperature is larger than or equal to the threshold value, a connecting pipeline has no freezing risk, the urea pump is controlled to skip suck-back, and the vehicle is directly stopped. According to the control method of the urea pump, the interior of the connecting pipeline can be kept wet, and the urea crystallization risk is reduced; and the time interval from powering-off to stopping of the vehicle can be shortened, and the user experience is optimized.

Description

technical field [0001] The invention relates to the technical field of engine exhaust catalytic reduction, in particular to a control method of a urea pump and an engine aftertreatment system. Background technique [0002] The aftertreatment urea supply system for vehicle diesel engines is mainly composed of urea tank, urea pump, reverse valve and connecting pipelines and other components. After the vehicle is powered off and stopped, the reverse valve is opened to release the pressure, reducing the pressure of the urea solution in the connecting pipeline to below the set value, and then the urea pump reverses to suck 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 high in summer, keeping a part of the liquid in the connecting pipeline can reduce the ...

Claims

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Application Information

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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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