Method for preventing urea pump from cavitation corrosion in post-treatment system

A urea dosing pump and post-processing technology, which is applied to the electronic control of the exhaust treatment device, the diagnosis device of the exhaust treatment device, and the exhaust treatment, etc., can solve the problems of damage to the urea pump and cavitation of the urea pump.

Active Publication Date: 2019-01-25
TENNECO SUZHOU EMISSION SYST
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Problems solved by technology

[0003] However, in actual use, due to various reasons, such as air bubbles or low pressure, the system pipeline will cause cavitation of the urea pump and damage the urea pump.

Method used

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  • Method for preventing urea pump from cavitation corrosion in post-treatment system
  • Method for preventing urea pump from cavitation corrosion in post-treatment system

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Embodiment Construction

[0045] Please refer to figure 1 As shown, the present invention discloses an aftertreatment system for treating exhaust gas from a diesel engine. The post-treatment system includes a urea tank 1, a filter 2 connected to the urea tank 1, a urea pump 3 for sucking urea solution from the urea tank 1, and a common pump 3 in fluid communication with the urea tank 1. rail 4, the urea nozzle 5 communicating with the common rail 4, the temperature sensor T connected in the flow path of the aftertreatment system, the vacuum pressure sensor P1 connected upstream of the inlet of the urea pump 3, and the The aftertreatment system is controlled by a urea system controller 6 . The urea nozzle 5 is used to spray urea droplets into the exhaust of the engine, and the excess urea solution flows back to the common rail 4 and finally returns to the urea tank 1 . The urea system controller 6 communicates with the engine controller (ECU). The urea droplets are broken down in the engine's exhaust...

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Abstract

The invention relates to a method for preventing a urea pump from cavitation corrosion in a post-treatment system, which comprises a urea tank, a urea pump, a common rail, a urea nozzle, a temperaturesensor, a vacuum pressure sensor and a urea system controller. The method for preventing the urea pump from cavitation corrosion in the post-treatment system comprises the following steps: S0: starting; S1: a safe operating pressure value P of the urea pump is obtained by the following formula: P=PRho+Pu-Pv-Pho*g*(NPSHp+SF), wherein PRho represents a vacuum pressure detection value of the vacuumpressure sensor; Pu represents a ambient pressure value; Pv represents a urea vapor pressure value obtained from a detection value of the temperature sensor; g represents gravity acceleration; NPSHprepresents the net positive suction head of the urea pump; SF represents a security parameter; S2, judging whether P is less than 0 or not; if P is less than 0, the system back pumps and then stops operation of the urea pump to prevent cavitation of the urea pump.

Description

technical field [0001] The invention relates to a method for preventing cavitation of a urea pump in an aftertreatment system, and belongs to the technical field of engine exhaust aftertreatment. Background technique [0002] The engine exhaust treatment system in the prior art generally includes a urea tank, a urea pump for pumping urea solution out of the urea tank, and a nozzle connected to the urea pump. The nozzle is used to spray atomized urea droplets into the exhaust gas of the engine, so as to purify the exhaust gas. [0003] However, in actual use, due to various reasons, such as air bubbles or low pressure, the system pipeline will cause cavitation to the urea pump and damage the urea pump. Contents of the invention [0004] The purpose of the present invention is to provide a method for preventing cavitation of the urea pump in the aftertreatment system. [0005] To achieve the above object, the present invention adopts the following technical solution: a met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/208F01N11/00F01N2510/08F01N2610/146Y02T10/40
Inventor 严秋华孙树平李敏陈川林银山
Owner TENNECO SUZHOU EMISSION SYST
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