KR20120015553A - Exhaust gas valve - Google Patents

Exhaust gas valve Download PDF

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Publication number
KR20120015553A
KR20120015553A KR1020100077726A KR20100077726A KR20120015553A KR 20120015553 A KR20120015553 A KR 20120015553A KR 1020100077726 A KR1020100077726 A KR 1020100077726A KR 20100077726 A KR20100077726 A KR 20100077726A KR 20120015553 A KR20120015553 A KR 20120015553A
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South Korea
Prior art keywords
flap
back pressure
pressure valve
area
area ratio
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KR1020100077726A
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Korean (ko)
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박기형
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현대자동차주식회사
기아자동차주식회사
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Priority to KR1020100077726A priority Critical patent/KR20120015553A/en
Publication of KR20120015553A publication Critical patent/KR20120015553A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0276—Actuation of an additional valve for a special application, e.g. for decompression, exhaust gas recirculation or cylinder scavenging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/24—Layout, e.g. schematics with two or more coolers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PURPOSE: A back pressure valve is provided to prevent an engine from turning off even if a flap is completely closed by preventing the complete cutoff of exhaust gas. CONSTITUTION: A back pressure valve comprises a flap(10). The flap has a flap body area and an inner space area and changes the flowing amount of gas using the cutoff area change of an inner space. The ratio of the flap body area and the inner space area is reduced by reducing the diameter size of the flap and forming one or more holes in the flap.

Description

배압밸브{Exhaust Gas Valve} Back Pressure Valve {Exhaust Gas Valve}

본 발명은 배압밸브에 관한 것으로, 특히 밸브 내부의 플랩(Flap)으로 인한 작동이상이 방지되고 주사용 영역도 확장되어진 구조를 갖는 배압밸브에 관한 것이다.The present invention relates to a back pressure valve, and more particularly, to a back pressure valve having a structure in which malfunction due to a flap inside the valve is prevented and the area for injection is expanded.

일반적으로 저압 배기가스 재순환 시스템인 LP-EGR(Low Pressure Exhaust Gas Recirculation)은 터보차저 후단에 밸브를 장착하여 터보차저의 컴프레서 전단으로 배기가스를 재순환함으로 질소산화물(Nox)을 저감하는 장치이다.In general, LP-EGR (Low Pressure Exhaust Gas Recirculation), a low pressure exhaust gas recirculation system, is a device that reduces nitrogen oxides (Nox) by recirculating exhaust gas to the compressor front end of the turbocharger by installing a valve at the rear end of the turbocharger.

상기 LP-EGR은 EURO5, 북미, EURO6 EM 규제법(미국, 유럽의 배기가스 규제법)에 적절하게 대응하기 위한 장치로 개발된 것이다.The LP-EGR has been developed as a device to properly respond to the EURO5, North America, EURO6 EM regulations (emission regulations of the United States, Europe).

상기 LP-EGR는 시스템에 차압이 형성되어야 작용하므로, 후처리장치인 DPF 후단에 구비된 배압 밸브가 작동되어 배압을 높이고 차압을 형성하게 된다.Since the LP-EGR works only when a differential pressure is formed in the system, the back pressure valve provided at the rear end of the DPF, which is a post-processing device, operates to increase the back pressure and form a differential pressure.

상기와 같은 배압 밸브는 개도각이 조절되는 플랩(Flap)의 닫힘량에 따라 차압의 크기가 제어되는 타입이므로, 상기 배압 밸브의 거동 민감성이 LP-EGR의 작용에 불리하지 않아야 LP-EGR가 정밀하게 제어될 수 있다.Since the size of the differential pressure is controlled according to the closing amount of the flap in which the opening angle is adjusted, the behavior sensitivity of the back pressure valve should not be detrimental to the action of the LP-EGR. Can be controlled.

통상, 상기 배압 밸브는 30도 - 68도의 플랩 거동각도가 주 사용영역으로 설정되고, 그에 따른 밸드작동듀티는 40%-65% 영역이 실사용 듀티로 설정되며, 플랩의 100%닫힘(Fully Closed)시 배압 밸브의 작동이 정지된다.Typically, the back pressure valve has a flap behavior angle of 30 degrees-68 degrees is set as the main use area, and accordingly, the belt operation duty is set to a real duty duty of 40%-65% area, and 100% of the flap is fully closed. ), The operation of the back pressure valve is stopped.

상기와 같은 조건을 갖는 배압 밸브에선 LP-EGR의 정밀한 제어를 어렵게 하는 거동 민감성이 존재하게 된다.In the back pressure valve having the above conditions, there is a behavior sensitivity that makes it difficult to precisely control the LP-EGR.

예를 들어, 배압밸브의 닫힘시 주 사용영역인 55도 이상의 플랩 닫힘각도임에도 불구하고 제어하기 어려울 정도로 급격한 차압 증가가 일어나거나, 또는 움직이지 않아 제어가 불가능한 플랩의 스턱(Stuck)이 일어날 땐, LP-EGR가 정밀하게 제어될 수 없는 상황을 초래할 수밖에 없게 된다.For example, when the back pressure valve closes, even when the flap closing angle is greater than 55 degrees, the sudden increase in pressure is difficult to control, or when the stag of the flap becomes uncontrollable due to inactivity. There is no choice but to cause a situation where LP-EGR cannot be precisely controlled.

무었보다도, 배압밸브의 작동 제어 이상으로 플랩이 100% 닫히는 비상상황이 발생되면, LP-EGR의 작동도 정지되어 엔진 꺼짐이 일어나게 된다.
Above all, if an emergency situation occurs in which the flap is closed 100% beyond the operation control of the back pressure valve, the operation of the LP-EGR is also stopped and the engine is turned off.

이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 면적을 축소시킨 플랩을 배압밸브에 적용해 어떠한 상황에서도 플랩에 의한 배기가스의 완전 차단현상이 방지될 수 있고, 플랩의 거동 민감성으로 인해 발생되는 작동이상을 방지할 수 있는 배압밸브를 제공하는데 목적이 있다.
Accordingly, the present invention has been invented in view of the above, and by applying a flap with a reduced area to the back pressure valve, it is possible to prevent the exhaust gas from completely blocking by the flap under any circumstances, and due to the sensitivity of the flap behavior. An object of the present invention is to provide a back pressure valve that can prevent a malfunction occurring.

상기와 같은 목적을 달성하기 위한 본 발명은 가스흐름통로인 내부공간의 차단면적변화로 가스흐름양을 변화시키는 플랩을 갖춘 배압밸브에 있어서, The present invention for achieving the above object is in the back pressure valve having a flap for changing the gas flow amount by the change of the blocking area of the inner space of the gas flow passage,

상기 플랩의 플랩바디면적과 상기 내부공간면적이 형성하는 플랩면적비가 1보다 작게 형성되어진 것을 특징으로 한다.The flap area ratio of the flap body area and the inner space area of the flap is formed to be smaller than one.

상기 플랩면적비의 축소는 상기 플랩의 직경크기를 축소해서 이루어진다.The reduction of the flap area ratio is achieved by reducing the diameter size of the flap.

상기 플랩면적비의 축소는 상기 플랩에 적어도 1개 이상으로 홀을 뚫어 형성되어진다.The reduction of the flap area ratio is formed by drilling at least one hole in the flap.

상기 플랩면적비의 축소는 상기 플랩의 회전중심을 기준으로 하여 상하양쪽끝단부위를 수평하게 잘라내어 형성되어진다.The reduction of the flap area ratio is formed by horizontally cutting the upper and lower end portions with respect to the rotation center of the flap.

상기 플랩 면적비의 축소는 상기 플랩의 회전중심을 기준으로 하여 좌우양쪽측면부위를 수평하게 잘라내어 형성되어진다.The reduction of the flap area ratio is formed by horizontally cutting the left and right side portions on the basis of the rotation center of the flap.

상기 배압밸브는 저압 배기가스 재순환장치에 적용되어진 것을 특징으로 한다.
The back pressure valve is characterized in that applied to the low pressure exhaust gas recirculation device.

이러한 본 발명은 플랩의 면적을 줄여 플랩의 개도 변화에 따른 유속 변화 기울기를 낮춰 배압밸브의 거동민감성으로 인한 이상 현상 방지와 LP-EGR의 정밀한 제어를 가능하게 하고, 플랩이 100% 닫히는 상황에서도 플랩에 의한 배기가스의 완전 차단을 방지해 엔진 꺼짐도 발생시키지 않는 효과가 있다.The present invention reduces the slope of the flow rate change according to the flap opening degree by reducing the area of the flap to prevent abnormality due to the behavior sensitivity of the back pressure valve and to precisely control the LP-EGR, even when the flap is 100% closed. This prevents the exhaust gas from being completely blocked and does not cause the engine to turn off.

도 1(가)는 본 발명에 따른 배압밸브가 적용된 저압 배기가스 재순환장치의 구성도이고, 도 1(나)내지 (마)는 본 발명에 따른 배압밸브의 플랩의 구성도와 그에 따른 다양한 변형례를 나타내고, 도 2와 도3은 본 발명에 따른 배압밸브의 작동선도이다.1 (a) is a configuration diagram of a low pressure exhaust gas recirculation device to which the back pressure valve according to the present invention is applied, Figure 1 (b) to (e) is a configuration of the flap of the back pressure valve according to the present invention and various modifications thereof 2 and 3 are operation diagrams of the back pressure valve according to the present invention.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명하며, 이러한 실시예는 일례로서 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 여러 가지 상이한 형태로 구현될 수 있으므로, 여기에서 설명하는 실시예에 한정되지 않는다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

도 1(가)는 저압 배기가스 재순환장치를 적용한 엔진 시스템의 일반적인 구성도를 나타낸다.1 (a) shows a general configuration diagram of an engine system to which a low pressure exhaust gas recirculation device is applied.

도시된 바와 같이, 상기 엔진 시스템은 외부공기를 엔진(1)으로 유입하는 흡기라인(2)에는 인터쿨러(2)가 구비되고, 배기 라인에는 후처리장치(6,DPF)가 구비되며, 상기 후처리장치(6,DPF)의 후단의 배기라인(5)에는 터보차저(4)가 구비되어진다. As shown, the engine system is provided with an intercooler (2) in the intake line (2) for introducing external air into the engine (1), the exhaust line is provided with a post-processing device (6, DPF) The turbocharger 4 is provided in the exhaust line 5 at the rear end of the processing apparatus 6, DPF.

상기 터보차저(4)의 터빈은 상기 후처리장치(6,DPF)의 상류측에 장착되고, 상기 터보차저(4)의 펌프는 상기 터빈에 의해서 작동되도록 상기 인터 쿨러(2)의 하류측에 장착된다.The turbine of the turbocharger 4 is mounted upstream of the aftertreatment device 6, DPF, and the pump of the turbocharger 4 is downstream of the inter cooler 2 to be operated by the turbine. Is mounted.

저압 배기가스 재순환장치(7)는 후처리장치(6,DPF)의 후단의 배기라인(5)에서 분기되어 터보차저(4)의 펌프의 하류측 흡기라인(1)으로 합류하는 저압 이지알 라인(8)을 갖추고, 상기 저압 이지알 라인(8)에는 HC/CO 정화장치와 저압 이지알 쿨러, 필터 및 배압밸브(9)가 순차적으로 배치된다. The low pressure exhaust gas recirculation device 7 branches from the exhaust line 5 at the rear end of the aftertreatment device 6, DPF and merges into the intake line 1 downstream of the pump of the turbocharger 4 (8), the HC / CO purifier, the low pressure EZ cooler, the filter, and the back pressure valve (9) are sequentially arranged in the low pressure easy line.

상기와 같은 구성부품들이 배치순서는 엔진 시스템의 구성에 따라서 변경될 수 있다.The arrangement order of the above components may be changed according to the configuration of the engine system.

상기 저압 배기가스 재순환장치(7)에서 배압밸브(9)는 저압 이지알 라인(8)을 통해 공급되는 배기가스의 배압을 높여줌으로써 요구되는 차압을 형성하며, 이를 위해 상기 배압밸브(9)의 내부에는 회전에 의한 개도각의 조절로 배기가스의 통과량을 정하는 플랩(10,Flap)이 구비되어진다,In the low pressure exhaust gas recirculation device 7, the back pressure valve 9 forms a required differential pressure by increasing the back pressure of the exhaust gas supplied through the low pressure easy line 8. The inside is provided with a flap (10, Flap) to determine the amount of passage of the exhaust gas by adjusting the opening angle by rotation,

도 1(나)내지 (마)는 본 실시예에 따른 배압밸브의 플랩의 구성도와 그에 따른 다양한 변형례를 나타낸다.1 (b) to (e) show the configuration of the flap of the back pressure valve according to the present embodiment and various modifications thereof.

도시된 바와 같이, 상기 플랩(10)은 배압밸브(9)의 내부 공간을 점유하는 원형형상의 플랩바디로 이루어지고, 상기 플랩바디의 중심부위에 연결된 회전축이 모터로 회전됨으로써 배압밸브(9)의 가스흐름통로 면적을 변화시키는 플랩(10)의 개도각 조정이 구현된다.As shown, the flap 10 is composed of a circular flap body occupying the internal space of the back pressure valve 9, the rotary shaft connected to the center of the flap body is rotated by a motor of the back pressure valve (9) The opening angle adjustment of the flap 10 which changes the gas flow path area is implemented.

상기 플랩(10)의 개도각 변화는 밸브바디(9)의 내부공간을 막는 수직한 상태(100%닫힘)에서 상기 내부공간을 완전히 여는 수평한 상태(100%열림)로 구현되어진다.The opening angle change of the flap 10 is implemented in a horizontal state (100% open) of completely opening the inner space in a vertical state (100% closed) to block the internal space of the valve body (9).

통상, 상기 플랩(10)의 플랩 면적비는 배압밸브(9)의 가스흐름통로인 내부공간면적(Ka)과 플랩(10)의 플랩바디면적(Kb)으로 표현되며, 플랩 면적비 Kb/Ka = 1인 플랩은 100%담힘(Fully Close)시 배압밸브(9)의 통로가 100% 막히게 된다.Typically, the flap area ratio of the flap 10 is represented by the internal space area Ka, which is the gas flow path of the back pressure valve 9, and the flap body area Kb of the flap 10, and the flap area ratio Kb / Ka = 1. In the flap, the passage of the back pressure valve 9 is blocked 100% when fully closed.

하지만, 본 실시예에 따른 플랩(10)은 플랩(10)의 100%담힘(Fully Close)시에도 배압밸브(9)의 가스흐름통로인 내부공간이 100% 막히지 않는 플랩 면적비(Kb/Ka)를 가지며, 이러한 플랩 면적비(Kb/Ka)는 플랩(10)의 플랩바디 형상을 이용해 구현되어진다.However, the flap 10 according to the present embodiment has a flap area ratio (Kb / Ka) in which the inner space, which is the gas flow passage of the back pressure valve 9, is not blocked 100% even when 100% of the flap 10 is fully closed. The flap area ratio Kb / Ka is implemented using a flap body shape of the flap 10.

도 1(나)는 제1실시예에 따른 플랩(10)의 예로서, 상기 플랩(10)은 모터로부터 회전력을 전달받는 축에 중심이 고정되어진 원형형상의 플랩바디로 이루어진 구조이다.1 (b) is an example of the flap 10 according to the first embodiment, the flap 10 is a structure consisting of a circular flap body is fixed to the axis receiving the rotational force from the motor.

제1실시예에선 배압밸브(9)의 가스흐름통로인 내부공간면적Ka =1로 할 때 상기 플랩(10)의 플랩 면적비(Kb/Ka)는 0.9 ~ 0.95로 설정되어진다.In the first embodiment, the flap area ratio Kb / Ka of the flap 10 is set to 0.9 to 0.95 when the internal space area Ka = 1, which is the gas flow path of the back pressure valve 9, is set.

하지만 상기 플랩 면적비(Kb/Ka)인 0.9 ~ 0.95는 한 예이며, 배압밸브(9)의 성능 특성을 향상하기 위해 다양한 값으로 변화될 수 있다.However, the flap area ratio (Kb / Ka) of 0.9 to 0.95 is one example, and may be changed to various values to improve the performance characteristics of the back pressure valve 9.

이를 위해 상기 플랩(10)의 플랩바디직경(D)은 배압밸브(9)의 가스흐름통로인 내부공간직경에 비해 약 90% ~ 95% 크기로 축소시켜준다.To this end, the flap body diameter (D) of the flap 10 is reduced to about 90% to 95% size compared to the inner space diameter of the gas flow passage of the back pressure valve (9).

도 1(다)는 제2실시예에 따른 플랩(10a)의 예로서, 상기 플랩(10a)도 모터로부터 회전력을 전달받는 축에 중심이 고정되어진 원형형상의 플랩바디로 이루어진 구조이다.1 (c) is an example of a flap 10 a according to a second embodiment, wherein the flap 10 a also has a structure of a circular flap body fixed at an axis to which a rotational force is transmitted from a motor.

제2실시예에서도 배압밸브(9)의 가스흐름통로인 내부공간면적Ka =1로 할 때 상기 플랩(10a)의 플랩 면적비(Kb/Ka)는 0.9 ~ 0.95로 설정되어진다.Also in the second embodiment, the flap area ratio Kb / Ka of the flap 10a is set to 0.9 to 0.95 when the internal space area Ka = 1, which is the gas flow path of the back pressure valve 9, is set.

하지만 상기 플랩 면적비(Kb/Ka)인 0.9 ~ 0.95는 한 예이며, 배압밸브(9)의 성능 특성을 향상하기 위해 다양한 값으로 변화될 수 있다.However, the flap area ratio (Kb / Ka) of 0.9 to 0.95 is one example, and may be changed to various values to improve the performance characteristics of the back pressure valve 9.

이를 위해 상기 플랩(10a)의 플랩바디에는 적어도 1개 이상의 홀(11)이 관통되어 뚫려짐으로써, 상기 플랩바디의 면적을 배압밸브(9)의 가스흐름통로인 내부공간면적에 비해 약 90% ~ 95% 크기로 축소시켜준다.To this end, the flap body of the flap (10a) is at least one hole 11 through the through, so that the area of the flap body is about 90% of the internal space area of the gas flow path of the back pressure valve (9) Reduce to 95% size.

상기 홀(11)은 플랩바디의 회전중심에 대해 양쪽으로 대칭되게 2개로 뚫리는 것이 바람직하다. Preferably, the holes 11 are drilled in two symmetrically to both sides with respect to the rotation center of the flap body.

도 1(라)는 제3실시예에 따른 플랩(10b)의 예로서, 상기 플랩(10b)은 모터로부터 회전력을 전달받는 축에 중심이 고정되어진 플랩바디로 이루어지되, 상기 플랩바디는 양측면부위를 원호형상으로 한 사다리꼴 형상으로 이루어진 구조이다.Figure 1 (d) is an example of the flap 10b according to the third embodiment, the flap 10b is composed of a flap body is fixed to the axis that receives the rotational force from the motor, the flap body both sides It is a structure made of a trapezoidal shape with an arc shape.

제3실시예에서도 배압밸브(9)의 가스흐름통로인 내부공간면적Ka =1로 할 때 상기 플랩(10b)의 플랩 면적비(Kb/Ka)는 0.9 ~ 0.95로 설정되어진다.Also in the third embodiment, the flap area ratio Kb / Ka of the flap 10b is set to 0.9 to 0.95 when the internal space area Ka = 1, which is the gas flow path of the back pressure valve 9, is set.

하지만 상기 플랩 면적비(Kb/Ka)인 0.9 ~ 0.95는 한 예이며, 배압밸브(9)의 성능 특성을 향상하기 위해 다양한 값으로 변화될 수 있다.However, the flap area ratio (Kb / Ka) of 0.9 to 0.95 is one example, and may be changed to various values to improve the performance characteristics of the back pressure valve 9.

이를 위해 상기 플랩(10b)의 플랩바디는 원형을 이룬 상태에서 플랩바디의 회전중심을 기준으로 하여 상하양쪽끝단부위를 수평하게 잘라낸 끝단직선부(12)가 형성되며, 상기 끝단직선부(12)의 절단면은 직선으로 형성되어진다.To this end, the flap body of the flap (10b) is formed in the form of the end straight line portion 12 is cut horizontally with the top and bottom both ends on the basis of the center of rotation of the flap body in a circular state, the end straight portion 12 The cut surface of is formed in a straight line.

도 1(마)는 제4실시예에 따른 플랩(10c)의 예로서, 상기 플랩(10c)도 모터로부터 회전력을 전달받는 축에 중심이 고정되어진 플랩바디로 이루어지되, 상기 플랩바디는 양측면부위를 원호형상으로 한 사다리꼴 형상으로 이루어진 구조이다.Figure 1 (e) is an example of the flap 10c according to the fourth embodiment, the flap (10c) is also made of a flap body is fixed to the axis that receives the rotational force from the motor, the flap body is both sides It is a structure made of a trapezoidal shape with an arc shape.

제4실시예에서도 배압밸브(9)의 가스흐름통로인 내부공간면적Ka =1로 할 때 상기 플랩(10c)의 플랩 면적비(Kb/Ka)는 0.9 ~ 0.95로 설정되어진다.Also in the fourth embodiment, the flap area ratio Kb / Ka of the flap 10c is set from 0.9 to 0.95 when the internal space area Ka = 1, which is the gas flow passage of the back pressure valve 9, is set.

하지만 상기 플랩 면적비(Kb/Ka)인 0.9 ~ 0.95는 한 예이며, 배압밸브(9)의 성능 특성을 향상하기 위해 다양한 값으로 변화될 수 있다.However, the flap area ratio (Kb / Ka) of 0.9 to 0.95 is one example, and may be changed to various values to improve the performance characteristics of the back pressure valve 9.

이를 위해 상기 플랩(10c)의 플랩바디는 원형을 이룬 상태에서 플랩바디의 회전중심을 기준으로 하여 좌우양쪽측면부위를 수직하게 잘라낸 측면직선부(13)가 형성되며, 상기 측면직선부(13)의 절단면은 직선으로 형성되어진다.To this end, the flap body of the flap (10c) is formed in the form of a side straight portion 13 is formed by vertically cutting the left and right side portions on the basis of the center of rotation of the flap body, the side straight portion 13 The cut surface of is formed in a straight line.

설명된 바와 같이 제1실시예내지 제4실시예에 따른 플랩(10,10a,10b,10c)은 원형을 이루는 플랩바디의 직경을 축소하거나, 상기 플랩바디의 원형형상에 홀을 뚫거나, 상기 플랩바디의 원형형상의 상하양쪽끝단부위를 잘라내거나 또는 원형형상의 좌우양쪽측면부위를 잘라내는 간단한 작업만으로 0.9 ~ 0.95로 축소된 플랩 면적비(Kb/Ka)를 얻을 수 있게 된다.As described, the flaps 10, 10a, 10b, and 10c according to the first to fourth embodiments reduce the diameter of the flap body forming a circle, or drill holes in the circular shape of the flap body, or The flap area ratio (Kb / Ka) reduced to 0.9 to 0.95 can be obtained by simply cutting the upper and lower end portions of the circular shape of the body or cutting the left and right side portions of the circular shape.

상기와 같이 플랩(10,10a,10b,10c)의 플랩 면적비(Kb/Ka)축소를 위한 작업공정이 극히 단순화됨으로써, 본 실시예에선 배압밸브(9)에 대한 설계변경이 없게 된다.As described above, the work process for reducing the flap area ratio Kb / Ka of the flaps 10, 10a, 10b, and 10c is extremely simplified, so that there is no design change to the back pressure valve 9 in the present embodiment.

도 2와 도 3은 본 실시예에 따라 플랩 면적비(Kb/Ka)가 축소된 배압밸브의 거동특성 및 유동특성을 나타낸다.2 and 3 show the behavior characteristics and flow characteristics of the back pressure valve is reduced flap area ratio (Kb / Ka) according to this embodiment.

도 2에서 알 수 있는 바와 같이 플랩 면적비(Kb/Ka)가 기존대비 0.9 ~ 0.95로 축소된 플랩(10,10a,10b,10c)를 적용한 배압밸브(9)는 주사용영역에서 플랩거동각도를 기존의 최대 68도에서 최대 76도로 증가시킬 수 있고, 작동튜티영역도 기존의 최대 65%에서 최대 72%로 확장될 수 있게 된다.As shown in FIG. 2, the back pressure valve 9 using the flaps 10, 10a, 10b, and 10c having the flap area ratio Kb / Ka reduced from 0.9 to 0.95 compared to the conventional one has a flap behavior angle in the scan area. It can be increased from the existing maximum 68 degrees to the maximum 76 degrees, and the operation duty area can be expanded from the existing maximum 65% to the maximum 72%.

특히, 상기 배압밸브(9)는 제어 이상으로 플랩이 닫혀지는 비상상황이 일어나더라도 100% 차단되지 않으므로 LP-EGR의 작동 정지나 엔진의 꺼짐현상을 일으키지 않게 된다.In particular, the back pressure valve 9 is not blocked 100% even if an emergency situation in which the flap is closed due to abnormal control does not cause the LP-EGR to stop working or to turn off the engine.

또한, 상기 배압밸브(9)는 도 3에서 알 수 있는 바와 같이 플랩(10,10a,10b,10c)의 닫힘각도가 증가될 때 배압밸브(9)를 통과하는 유량의 상대유속이 낮아지는 유동특성을 구현하게 된다.In addition, the back pressure valve 9 is a flow in which the relative flow rate of the flow rate passing through the back pressure valve 9 is lowered when the closing angle of the flaps 10, 10a, 10b, 10c is increased as shown in FIG. Will implement the property.

상기와 같이 배압밸브(9)의 제어 민감도를 결정하는 플랩의 닫힘각에 대한 유속변화의 정도가 줄어드는 유동특성이 구현되면, 상기 배압밸브(9)의 거동 민감성이 둔화되어 LP-EGR를 정밀하게 제어할 수 있게 된다.As described above, when a flow characteristic in which the degree of flow rate change is reduced with respect to the closing angle of the flap that determines the control sensitivity of the back pressure valve 9 is implemented, the behavior sensitivity of the back pressure valve 9 is slowed to precisely LP-EGR. You can control it.

특히, 이러한 유동특성을 구현하는 배압밸브(9)는 플랩이 55도 이상으로 닫히더라도 급격한 차압 증가를 발생시키지 않고, 또한 제어가 불가능한 플랩의 스턱(Stuck)이 발생되지 않게 된다.
In particular, the back pressure valve 9 which implements such a flow characteristic does not generate a sudden increase in the differential pressure even when the flap is closed at 55 degrees or more, and also prevents the control of a flap that is not controllable.

1 : 엔진 2 : 흡기라인
3 : 인터쿨러 4 : 터보챠저
5 : 배기라인 6 : 후처리장치(DPF)
7 : 저압배기가스 순환장치
8 : 저압이지알라인 9 : 배압밸브
10,10a,10b,10c : 플랩
11 : 홀 12 : 끝단직선부
13 : 측면직선부1: Engine 2: Intake Line
3: intercooler 4: turbocharger
5: exhaust line 6: after-treatment device (DPF)
7: low pressure exhaust gas circulator
8: low pressure gauge line 9: back pressure valve
10,10a, 10b, 10c: flap
11: hole 12: end straight part
13: side straight portion

Claims (8)

가스흐름통로인 내부공간의 차단면적변화로 가스흐름양을 변화시키는 플랩을 갖춘 배압밸브에 있어서,
상기 플랩의 플랩바디면적과 상기 내부공간면적이 형성하는 플랩면적비가 1보다 작게 형성되어진 것을 특징으로 하는 배압밸브.
In the back pressure valve with a flap that changes the gas flow amount by changing the blocking area of the internal space, which is a gas flow passage,
And a flap area ratio formed by the flap body area of the flap and the inner space area is less than one.
청구항 1에 있어서, 상기 플랩면적비의 축소는 상기 플랩의 직경크기를 축소해서 이루어진 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 1, wherein the reduction in the flap area ratio is made by reducing the diameter size of the flap.
청구항 1에 있어서, 상기 플랩면적비의 축소는 상기 플랩에 적어도 1개 이상으로 홀을 뚫어 형성되어진 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 1, wherein the reduction of the flap area ratio is formed by drilling at least one hole in the flap.
청구항 3에 있어서, 상기 개구홀은 2개를 한쌍으로 하고, 상기 플랩의 중심에 대해 서로 대칭을 이루는 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 3, wherein the two opening holes are paired and symmetrical with respect to the center of the flap.
청구항 1에 있어서, 상기 플랩면적비의 축소는 상기 플랩의 회전중심을 기준으로 하여 상하양쪽끝단부위를 수평하게 잘라내어 형성되어진 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 1, wherein the reduction of the flap area ratio is formed by horizontally cutting the upper and lower end portions with respect to the rotation center of the flap.
청구항 1에 있어서, 상기 플랩 면적비의 축소는 상기 플랩의 회전중심을 기준으로 하여 좌우양쪽측면부위를 수평하게 잘라내어 형성되어진 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 1, wherein the reduction of the flap area ratio is formed by horizontally cutting left and right side portions on the basis of the rotation center of the flap.
청구항 5 또는 청구항 6에 있어서, 상기 잘라낸 부위는 직선인 것을 특징으로 하는 배압밸브.
The back pressure valve according to claim 5 or 6, wherein the cutout portion is a straight line.
청구항 1에 있어서, 상기 배압밸브는 저압 배기가스 재순환장치에 적용되어진 것을 특징으로 하는 배압밸브. The back pressure valve of claim 1, wherein the back pressure valve is applied to a low pressure exhaust gas recirculation apparatus.
KR1020100077726A 2010-08-12 2010-08-12 Exhaust gas valve KR20120015553A (en)

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KR1020100077726A KR20120015553A (en) 2010-08-12 2010-08-12 Exhaust gas valve

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2537829A (en) * 2015-04-23 2016-11-02 Gm Global Tech Operations Llc EGR Valve Assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2537829A (en) * 2015-04-23 2016-11-02 Gm Global Tech Operations Llc EGR Valve Assembly
US10018163B2 (en) 2015-04-23 2018-07-10 GM Global Technology Operations LLC EGR valve assembly

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