Method for preventing urea nozzle clogging of scr system
A technology of SCR system and urea nozzle, applied in the direction of internal combustion piston engine, electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, etc., can solve problems such as blockage of urea nozzle and SCR system damage.
Inactive Publication Date: 2018-06-12
HYUNDAI MOTOR CO LTD +1
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Problems solved by technology
[0015] If the urea nozzle 20 is heated by the exhaust gas, the temperature of the urea reaches the crystallization temperature (71-75° C.), with auto-ignition running operation, the urea nozzle 20 is opened at 100%, urea crystallization occurs in the urea nozzle 20, and thus clogging may occur Urea nozzle
[0016] That is, while the auto-ignition operation is in progress, the urea nozzle 20 has to be opened, and urea crystallization occurs in the urea nozzle 20, but clogging of the urea nozzle 20 may not be detected
[0017] Especially if the backflow of urea 62 from the urea tank 60 to the supply module 50 occurs in winter, the SCR system may be damaged
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[0040] Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with exemplary embodiments, it will be appreciated that present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments but also various alternatives, modifications, equivalents and other alternatives, modifications, equivalents and others, which may be included within the spirit and scope of the invention as defined by the appended claims. implementation plan.
[0041] Furthermore, unless expressly stated to the contrary, the word "comprise" and variations such as "comprises" or "comprising" should be understood to imply the inclusion of stated elements but not the exclusion of any other elements.
[0042] For ease of understanding, constituent ...
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A method for preventing clogging of urea nozzles of an SCR system. Method for preventing clogging of urea nozzles in auto-ignition operation of a selective catalytic reduction (SCR) system by passing urea stored in a urea tank through a supply module, a urea nozzle and connecting said supply module and said urea The urea pipeline of the nozzle is supplied, and the method may include: an emptying step and a pressure equalization step, in which the urea is returned to the urea tank by creating a negative pressure in the supply module; In the pressure equalization step, the pressure in the supply module is restored by stopping generation of negative pressure in the supply module, wherein, in the pressure equalization step, based on The pressure is used to control whether to inject the urea forcibly.
Description
[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2013-0041213 filed on Apr. 15, 2013, the entire contents of which are hereby incorporated by reference for all purposes. technical field [0003] The present invention relates to a method for preventing clogging of urea nozzles of an SCR system. More specifically, the present invention relates to a method for preventing clogging of urea nozzles of an SCR system, which determines the pressure inside a supply module and prevents clogging of urea nozzles in autoignition operation. Background technique [0004] Generally, the exhaust gas discharged from the exhaust manifold of the engine is guided to a catalytic converter installed in the exhaust pipe and purified, passes through a muffler to reduce noise, and finally is discharged into the atmosphere through the exhaust pipe. [0005] The catalytic converter treats pollutants such as NOx in the exhaus...
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IPC IPC(8): F01N3/20
CPCF01N3/208F01N2610/02F01N2610/1493F01N2900/1808Y02T10/12Y02A50/20F01N3/20F01N9/00F01N11/00
Inventor 申宰硕
Owner HYUNDAI MOTOR CO LTD