DE102015104734A1 - Apparatus and method for removing residual urea - Google Patents

Abstract

A residual urea removal apparatus (100) may include an internal combustion engine (110), an exhaust system (120) configured to exhaust exhaust gas generated by the internal combustion engine (110), a dosing module (130) configured to Installed on one side of the exhaust system (120) to inject urea into the exhaust system (120), a metering pump (140) configured to perform delivery of urea from a urea tank (150) to the metering module (130) stop, and a control unit (160) configured to control on / off of the metering pump (140) and to perform a shake control to remove the residual urea present in the metering module (130).

Description

Cross Reference (s) to Related Application (s)

This application claims the benefit of the priority of Korean Patent Application No. 10-2014-0139724 , filed on Oct. 16, 2014, the entire contents of which are incorporated herein by reference.

Background of the invention

Field of the invention

Exemplary embodiments of the present invention relate to a technology for removing urea for a vehicle, and more particularly to an apparatus and method for removing residual urea (eg, residual urea solution) capable of removing residual urea within a metering module and at a tip section by performing a urea follow-up function (eg, urea return (overrun) function) at a time of ignition-off / key-off, and then performing a shaking function on the dosing module.

Description of the Related Art

Exhaust gas discharged by a combustion process of fossil fuels in a diesel internal combustion engine to obtain a heat source and / or a power source inevitably has a nitrogen oxide (NO _x ) component which is a causative substance of light smog , acid rain and respiratory diseases is found.

This will make an environmental problem serious. Therefore, an emission specification of the nitrogen oxide (NO _x ) component has recently been tightened. To cope with this, a technology for removing nitrogen oxide (NO _x ) from / from various types of exhaust gas has been used.

Among these technologies, Selective Catalytic Reduction (SCR) technology using urea (e.g., urea solution) has been variously / variously applied.

The SCR denitrification system (eg, SCR-DeNO _x system) generally has a structure for routing exhaust gases through an SCR catalyst to produce a nitrogen oxide (NO _x ) component in the midst of exhaust gases from an internal combustion engine to be discharged (not illustrated), to de-nitrogenize (denitrification reaction) to obtain optimum denitration efficiency (eg DeNO _x efficiency). The SCR denitrification system generally has a structure for effectively preventing pollution by the nitrogen oxide (NO _x ) component and / or ammonia (eg, by a reaction of the two).

In this case, the dosing module (not illustrated) is used to inject the urea. The appropriate urea injection reduces the nitrogen oxide (NO _x ) component to meet the emission regulations. However, the nitrogen oxides of the exhausted gases (eg, exhaust gases) may be caused by non-injection of the urea caused by clogging of the metering module tip (not illustrated) due to crystallization of urea and deviation of urea injection amount due to wear of an internal ball valve, valve seat, etc. be increased / be.

Further, the SCR denitrification system has a urea tailing function to prevent moisture in the urea (eg, urea solution) within the metering module, which is exposed to high temperature, from being ignited / key-off (eg, vehicle-off, eg shutting down the vehicle) evaporates, and to prevent moisture from freezing due to low temperature (eg in winter).

However, it is difficult to fully recycle residual urea at a valve and a tip section in the dosing module at the time of urea recycling at a negative pressure.

Summary of the invention

One embodiment of the present invention is directed to an apparatus and method for removing residual urea (eg, residual urea solution, eg, residual urea solution) capable of removing residual urea within a metering module and at a tip section (eg, front end of the metering module by performing a urea follow-up function at a time of ignition-off / key-off (eg, vehicle-off, eg, turning off the vehicle).

Another embodiment of the present invention is directed to an apparatus and method for removing residual urea capable of preventing power reduction of a metering module due to crystallization of the urea.

Other objects and advantages of the present invention can be understood by the following description, and become apparent with reference to the embodiments of the present invention. Moreover, it will be apparent to those skilled in the art to which the present invention pertains that the objects and Advantages of the present invention can be realized by the claimed agents and / or combinations thereof.

In order to achieve the above objects, an embodiment of the present invention provides an apparatus for removing residual urea (eg, residual urea solution, eg, residual urea solution) by performing a urea tailing function at the time of ignition-off / key-off (eg vehicle-off, eg turning off the vehicle) and then removing the residual urea within a metering module and at a tip section (eg tip of the metering module, eg nozzle section).

According to one embodiment of the present invention, a device for removing residual urea (e.g., residual urea solution, e.g., urea solution residue) comprises: an internal combustion engine; an exhaust system configured to exhaust exhaust gas generated by the internal combustion engine; a dosing module configured to be installed on / on one side of the exhaust system to inject urea (e.g., urea solution) into the exhaust system; a metering pump configured to perform / stop supplying urea from a urea tank to the metering module; and a control unit configured to control on / off of the metering pump and to perform a shake control to remove the residual urea present in the metering module.

The jar control may use a duty cycle (e.g., duty cycle) and an operating frequency (e.g., frequency of operation) of the dosing module to produce jarring (e.g., a jarring motion and / or vibration) in the dosing module.

The jar control may be performed after a urea follower section (eg, urea return section) where the dosing module is continuously (for a vehicle off, eg, off the vehicle) for a predetermined time or duration at the time of ignition off / key off. eg constant).

The residual urea may be urea present in a tip (e.g., at a forward end) of the dosing module after the urea trail section.

The jar control may include from the residual urea a portion of the residual urea present in a (tip) nozzle of the dosing module and a portion of the residual urea within a sliding portion (eg, flow section). is present, in which a ball valve of the metering module touches / contacts a valve seat (eg a plate) to the exhaust system.

A work (e.g., pulse height / displacement) in the duty cycle may be 100% and the operating frequency (e.g., frequency, e.g., pulse frequency) may be four times.

The ball valve may be connected to an elastic member to generate jarring (e.g., vibration) by physical / physical collision with the valve seat.

The exhaust system may be or may include a muffler. For example, For example, the exhaust system may additionally include one or more of an exhaust manifold, an exhaust conduit, and an exhaust catalyst.

In the urea follow-up section, the urea in the dosing module can be returned to the dosing pump by a negative pressure.

According to another embodiment of the present invention, a method of removing residual urea (eg, residual urea solution, eg, urea solution residue) comprises: using a metering pump by a controller to supply urea (eg, urea solution) from a urea tank to a urea tank To perform / stop dosing module; Use of the dosing module by the control unit to inject the urea into an exhaust system which discharges exhaust gas generated by an internal combustion engine; and performing a shake control by the control unit to remove the residual urea present in the metering module.

Brief description of the drawings

1 FIG. 10 is a block diagram of a configuration of a residual urea removal apparatus according to an exemplary embodiment of the present invention. FIG.

2 FIG. 10 is a control flowchart of a method for performing a jerk control function based on a duty cycle / operating frequency set in a dosing module according to an exemplary embodiment of the present invention. FIG.

3 FIG. 3 is a flowchart illustrating a method of removing residual urea according to an exemplary embodiment of the present invention.

4 FIG. 12 is a cross-sectional view generally illustrating a state before the residual urea is recycled. FIG.

5 FIG. 12 is a cross-sectional view generally illustrating a state after the residual urea has been recycled. FIG.

Description of specific embodiments

Since the present invention may be variously modified and embodied in several exemplary embodiments, specific exemplary embodiments will be shown in the accompanying drawings and described in detail in a detailed description. It should be understood, however, that the present invention is not limited to the specific exemplary embodiments, but includes all modifications, equivalents, and substitutions included within the spirit and scope of the present invention.

In the accompanying drawings, the same reference numerals are used throughout to describe the same components.

Terms such as "first," "second," etc. used in the description may be used to describe various components, but the components should not be construed as limited to those terms. The terms are used to distinguish one component from another component.

Therefore, the first component may be referred to as the second component, and the second component may be referred to as the first component. The term "and / or" includes a combination of a plurality of items / components / terms or any of a variety of items / components / terms.

Unless otherwise indicated, it should be understood that all terms including technical and scientific terms used in the specification have the same meaning as commonly understood to one of ordinary skill in the art.

It must be understood that the terms defined by a dictionary are consistent with meaning within the context of the related art, and they are not to be idealized or overly formally defined / interpreted unless the context obviously dictates otherwise.

Hereinafter, an apparatus and a method for removing residual urea according to exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 FIG. 10 is a block diagram of a configuration of a device. FIG 100 for removing residual urea (eg, residual urea solution) according to an exemplary embodiment of the present invention. The device 100 for removing residual urea points to an internal combustion engine 110 , an exhaust system 120 , configured to exhaust, which from the internal combustion engine 110 is generated to eject, a dosing module 130 Configured to be on / on one side of the exhaust system 120 be installed to urea in the exhaust system 120 to inject a urea tank 150 Configured to contain urea (eg, urea solution), a metering pump 140 configured to supply urea from the urea tank 150 to the dosing module 130 to open / close or perform / stop a control unit 160 , configured to turn on / off the dosing pump 140 and to perform a jar control to remove the residual urea, which in the dosing 130 is available.

The internal combustion engine 110 is a diesel internal combustion engine and the exhaust system 120 may generally be or include a muffler configured to exhaust gas from the engine 110 is generated, but may be configured from a manifold, a catalyst and the like.

A negative pressure (suction side) is between the urea tank 150 and the dosing pump 140 applied / applied / applied and a positive pressure (pressure side) is between the dosing pump 140 and the dosing module 130 used / applied / deposited. This is a section between the dosing module 130 , the dosing pump 140 and the urea tank 150 completely filled with urea. In contrast, the negative pressure (suction side) between the metering pump 140 and the dosing module 130 applied / applied / applied when the operation (eg driving) of the vehicle stops, and therefore the urea which enters the dosing module 130 is filled, to the metering pump 140 recycled. In this case, the urea, which by allowing the control unit 160 the dosing pump 140 in the reverse direction turns on / operates, is returned to the urea tank 150 fed.

The exhaust system 120 is with the dosing module 130 equipped to reduce the urea to reduce the nitrogen oxide (NO _x ) in the middle of the exhaust gases from the internal combustion engine 110 inject.

2 FIG. 3 is a control flowchart of a method for performing a jerk control function based on a duty cycle / operating frequency set in the dosing module according to an exemplary embodiment of the present invention. Referring to 2 For example, a urea control section that controls the urea is configured mainly of three sections. That is, the urea control section is configured of a normal control section 210 in which the urea is normally controlled while the vehicle is operating (eg, being driven), a urea trail section 220 in which the urea is returned as a function of ignition-off / key-off, a shaker control section 230 , in which the despite the urea trailing section in the dosing 130 ( 1 ) existing residual urea and the like is removed.

The normal control section 210 is a section passing through the dosing module 130 injected urea by various changes in a period of time and a quantity (for example, by varying a width and / or height of a pulse) of the duty cycle of the dosing 130 controls while the vehicle is in operation (eg driving).

The urea tailing section 220 is continuous as soon as a predetermined time elapses after the vehicle has been switched off (eg ignition-off / key-off signal) and has a work (eg pulse height) of 100%. Therefore, the urea trail section becomes 220 to a section in which the in the dosing 130 Existing urea is returned by the negative pressure.

The shaker control section 230 Follow immediately after the urea tailing section 220 ends. In other words, the residual urea, which is also due to the urea tailing section 220 is not removed is from the dosing module 130 shaken by shaking and therefore drips into the exhaust system 120 ( 1 ). Especially in the work cycle, which in 2 is illustrated, the work is 100% and the operating frequency is about four times.

3 FIG. 3 is a flowchart illustrating a method of removing residual urea according to an exemplary embodiment of the present invention. Referring to 3 leads the control unit 160 ( 1 ) the normal control section 210 ( 2 ) when the vehicle is in operation (eg, being driven) (step S310).

The control unit 160 determines (eg, confirms) whether the vehicle is turned off by a driver during operation (eg, during driving) (eg, ignition-off / key-off signal received) (step S320).

If it is determined in step S320 that there is no power off / ignition off / key off, step S310 is repeatedly executed. Conversely, if it is determined in step S320 that the power off / ignition off / key off is present, the control unit will execute 160 the urea caster function 220 from (step S330). In other words, the control unit 160 guides the urea tailing section 220 ( 2 ) out.

Next comes the control unit 160 directly the shaker control section 230 ( 2 ), depending on whether the urea tailing section 220 ends.

4 FIG. 12 is a cross-sectional view generally illustrating a state before the residual urea is recycled; and FIG 5 FIG. 12 is a cross-sectional view generally illustrating a state after the residual urea has been recycled. FIG.

In particular 4 a cross-sectional view illustrating a state in which the tip portion (front end portion) of the dosing 130 which is in 1 is illustrated, is cut. Referring to 4 is a heart of the top 410 with a ball valve 420 and a valve seat 430 which is the ball valve 420 touched / contacted, provided. Furthermore, an outermost surface of the apex 410 with a tip nozzle 460 provided. The outermost surface of the top 410 is with a nozzle groove 461 provided through which the urea through the (tip) nozzle 460 is injected.

Meanwhile, the ball valve 420 with a moving part 450 connected and moves to the right and left according to or together with the movable part 450 , In particular, the moving part 450 with an elastic member, such as a spring, connected (not illustrated), and when the ball valve 420 the valve seat 430 due to the elastic member touches / contacts, the ball valve physically / physically collides with the valve seat 430 , and thereby the valve seat 430 shocked. Therefore, some of the residual urea, which is in the nozzle 460 is present, and / or some of the residual urea, which within a sliding section 520 ( 5 ) is present, in which the ball valve 420 the valve seat 430 touched / contacted, torn away / released and into the exhaust system 120 ( 1 ) pushed out.

Further, for the shaking which depends on the shock, the duty cycle and the operating frequency are used.

In other words, in the state of 5 the residual urea, which is present in a drop form, through the nozzle groove 461 ( 4 ) when the ball valve 420 with the valve seat 430 collides while the ball valve 420 is moved several times to the left and right.

According to the exemplary embodiments of the present invention, it is possible to remove the residual urea within the dosing module 130 and at the tip section by performing the urea tracking function and then additionally performing the shake function.

Further, according to the exemplary embodiments of the present invention, it is possible to maintain the nitrogen oxide (NO _x ) by minimizing the deviation of the urea injection amount due to the long-term operation by improving the life of the metering module at the prescribed level.

In addition, according to the exemplary embodiments of the present invention, it is possible to improve the marketability of the vehicle by avoiding the unnecessary replacement.

The foregoing exemplary embodiments are merely examples to enable a person skilled in the art to which the present invention relates (hereinafter referred to as a person skilled in the art) to easily carry out the present invention. Accordingly, the present invention is not limited to the foregoing exemplary embodiments and the accompanying drawings, and therefore, an scope of the present invention is not limited to the foregoing exemplary embodiments. Accordingly, it will be apparent to those skilled in the art that substitutions, modifications and variations can be made without departing from the spirit and scope of the invention as defined by the appended claims and also within the scope of the present invention.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• KR 10-2014-0139724 [0001]

Claims (10)

A device ( 100 ) for removing residual urea, comprising: an internal combustion engine ( 110 ); an exhaust system ( 120 ), configured to exhaust, which from the internal combustion engine ( 110 ) is ejected; a dosing module ( 130 ), configured to be on one side of the exhaust system ( 120 ) to be installed to urea into the exhaust system ( 120 ) to inject; a dosing pump ( 140 ), configured to supply urea from a urea tank ( 150 ) to the dosing module ( 130 ) to perform / stop; and a control unit ( 160 ), configured to turn on / off the metering pump ( 140 ) and to perform a shaker control to remove the residual urea which is present in the dosing module ( 130 ) is available. The device ( 100 ) according to claim 1, wherein the vibration control comprises a duty cycle and an operating frequency of the dosing module ( 130 ) is used to shake in the dosing module ( 130 ) to create. The device ( 100 ) according to claim 1 or 2, wherein the jar control after a urea tailing section ( 220 ) is carried out, in which the metering module ( 130 ) is continuously operated at a time of ignition-off (key-off) for a predetermined time. The device ( 100 ) according to any one of claims 1-3, wherein the residual urea is urea, which is in a tip of the dosing ( 130 ) after the urea tailing section ( 220 ) is available. The device ( 100 ) according to any one of claims 1-4, wherein the agitation control of the residual urea comprises a portion of the residual urea which is contained in a tip nozzle ( 460 ) of the dosing module ( 130 ) and / or a portion of the residual urea, which within a sliding section ( 520 ) is present, in which a ball valve ( 420 ) of the dosing module ( 130 ) a valve seat ( 430 ) touched / contacted, to the exhaust system ( 120 ) ejects. The device ( 100 ) according to any one of claims 2-5, wherein a work in the duty cycle is 100% and the operating frequency is four times. The device ( 100 ) according to claim 5 or 6, wherein the ball valve ( 420 ) is connected to an elastic element to allow physical / physical collision with the valve seat ( 430 ) To generate shaking. The device ( 100 ) according to any one of claims 1-7, wherein the exhaust system ( 120 ) is or has a muffler. The device ( 100 ) according to any one of claims 3 to 8, wherein in the urea tailing section ( 220 ) the urea in the dosing module ( 130 ) by a negative pressure to the metering pump ( 120 ) is returned. A method of removing residual urea, comprising: using a metering pump ( 120 ) by a control unit ( 160 ) to supply urea from a urea tank ( 150 ) to a dosing module ( 130 ) to perform / stop; Use of the dosing module ( 130 ) by the control unit ( 160 ) to convert the urea into an exhaust system ( 120 ), which exhaust gas, which from an internal combustion engine ( 110 ) is ejected; and executing a shake control by the control unit ( 160 ) to the residual urea, which in the dosing ( 130 ) exists to remove.

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