KR100528205B1 - EGR cooling system - Google Patents

EGR cooling system Download PDF

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Publication number
KR100528205B1
KR100528205B1 KR10-2003-0071664A KR20030071664A KR100528205B1 KR 100528205 B1 KR100528205 B1 KR 100528205B1 KR 20030071664 A KR20030071664 A KR 20030071664A KR 100528205 B1 KR100528205 B1 KR 100528205B1
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South Korea
Prior art keywords
refrigerant
egr
supplied
temperature
supply line
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KR10-2003-0071664A
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Korean (ko)
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KR20050036099A (en
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윤석준
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현대자동차주식회사
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/29Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32Liquid-cooled heat exchangers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23Layout, e.g. schematics
    • F02M26/28Layout, e.g. schematics with liquid-cooled heat exchangers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

본 발명은 EGR 냉각장치에 관한 것으로서, 특히 에어콘용 냉매를 매개체로하여 EGR 가스를 냉각하도록 EGR쿨러를 구성하고, 엔진의 운전조건에 따라 상기 EGR쿨러로 공급되는 저온의 냉매 공급량을 조절하는 냉매공급수단을 구성하므로서, 저온의 냉매로서 EGR 가스를 냉각시키므로 EGR 냉각장치의 냉각효율이 향상되고, 엔진 운전조건에 따라 상온 EGR과 저온 EGR이 별도의 바이패스 밸브 및 파이프 없이 구현되며, 제품의 구조를 단순화하여 조립공정 단축 및 생산성 향상의 효과를 기대할 수 있도록 한 EGR 냉각장치에 관한 것이다.The present invention relates to an EGR cooling device, and in particular, an EGR cooler configured to cool an EGR gas through a medium for an air conditioner, and a refrigerant supply for controlling a low temperature refrigerant supply amount supplied to the EGR cooler according to an engine operating condition. By constituting the means, the cooling efficiency of the EGR cooling system is improved by cooling the EGR gas as a low temperature refrigerant, and the room temperature EGR and the low temperature EGR are realized without separate bypass valves and pipes according to the engine operating conditions. The present invention relates to an EGR cooling device that can simplify the assembly process and improve the productivity.

Description

이지알 냉각장치{EGR cooling system}EZR cooling system

본 발명은 EGR 냉각장치에 관한 것으로서, 특히 저온의 냉매로서 EGR 가스를 냉각시키므로 EGR 냉각장치의 냉각효율이 향상되고, 엔진 운전조건에 따라 상온 EGR과 저온 EGR이 별도의 바이패스 밸브 및 파이프 없이 구현되며, 제품의 구조를 단순화하여 조립공정 단축 및 생산성 향상의 효과를 기대할 수 있도록 한 EGR 냉각장치에 관한 것이다.The present invention relates to an EGR cooling device, and in particular, the cooling efficiency of the EGR cooling device is improved because the EGR gas is cooled as a low temperature refrigerant, and room temperature EGR and low temperature EGR are implemented without separate bypass valves and pipes according to engine operating conditions. The present invention relates to an EGR cooling device that can simplify the structure of the product and expect an effect of shortening the assembly process and improving productivity.

도 4 는 종래의 EGR 냉각장치를 도시한 것으로서,Figure 4 shows a conventional EGR cooling device,

흡기가 흡기매니폴드(32)를 통해 엔진(30)으로 공급되고, 엔진(30)의 연소과정에서 발생된 배기가스가 배기매니폴드(31)를 통해 배출되도록 구성되며, 배기가스의 일부를 흡기측으로 재순환시켜 NOx 의 발생량을 줄여주기 위한 EGR 라인(36)이 별도 구성된다.Intake air is supplied to the engine 30 through the intake manifold 32, and exhaust gas generated in the combustion process of the engine 30 is discharged through the exhaust manifold 31, and a part of the exhaust gas is intaked. EGR line 36 is configured separately to recycle to the side to reduce the amount of NOx generated.

상기 EGR라인(36)의 도중에는 냉각수를 냉매제로하여 EGR라인(36)을 통과하는 EGR 가스를 냉각시키는 EGR 쿨러(33)가 설치되는데, 상기 EGR 쿨러(33)의 입구측과 출구측을 가로지르도록 연결하는 바이패스통로(34)가 구비되고, 상기 바이패스통로(34)의 출구측에는 엔진의 운전조건에 따라 개폐되어 EGR 가스가 EGR쿨러(33)를 통과하여 흡기매니폴드(32)로 공급되도록 하거나 EGR 가스가 바이패스통로(34)를 통해 곧바로 흡기매니폴드(32)로 공급되도록 하는 바이패스 밸브(35)가 형성된 구성이다.An EGR cooler 33 is installed in the middle of the EGR line 36 to cool the EGR gas passing through the EGR line 36 using the cooling water as a refrigerant, and crosses the inlet side and the outlet side of the EGR cooler 33. The bypass passage 34 is connected to the air supply, and the outlet passage 34 is opened and closed according to the operating conditions of the engine so that the EGR gas passes through the EGR cooler 33 and is supplied to the intake manifold 32. Bypass valve 35 is formed so that the EGR gas is supplied to the intake manifold 32 directly through the bypass passage 34.

상기와같이 구성된 종래의 EGR 냉각장치는 엔진이 저부하 상태로 운전될경우 바이패스밸브(35)가 개방되어 상온의 EGR가스가 그대로 흡기매니폴드(32)를 통해 엔진(30)으로 공급되어 배기가스중의 CO, HC, 매연이 저감되도록 하는 이른바 상온(Hot) EGR이 구현되며, 엔진이 고부하 상태로 운전될 경우 바이패스밸브(35)가 차단되어 EGR 쿨러(33)를 통과한 저온의 EGR 가스가 엔진(30)으로 공급되도록 하여 배기가스중의 NOx, 매연이 저감되도록 하는 이른바 저온(Cold) EGR이 구현되게 된다.In the conventional EGR cooling device configured as described above, when the engine is operated at a low load state, the bypass valve 35 is opened so that the EGR gas at room temperature is supplied to the engine 30 through the intake manifold 32 and exhausted. The so-called hot EGR is implemented to reduce the CO, HC, and soot in the gas. When the engine is operated under high load, the bypass valve 35 is shut off and the low temperature EGR is passed through the EGR cooler 33. The gas is supplied to the engine 30 so that NOx in exhaust gas, so-called cold EGR, which reduces soot, is realized.

그러나, 종래의 EGR 냉각장치는 EGR 가스를 냉각시키는 냉매제로서 냉각수를 사용하기 때문에 냉매제의 온도를 필요에 따라 저온으로 낮춰줄 수 없어서 EGR 가스를 효과적으로 냉각시키지 못하는 문제점이 발생하고 있었다.However, in the conventional EGR cooling device, since the cooling water is used as the refrigerant for cooling the EGR gas, the temperature of the refrigerant can not be lowered to a low temperature as necessary, and thus, the EGR gas cannot be effectively cooled.

즉, EGR 쿨러에 공급되는 냉매제의 온도에 따른 배기가스중의 NOx와 매연(Soot)의 발생량은 도 5 에 도시된 바와같이 냉매제의 온도가 80℃, 60℃, 30℃, 15℃로 낮아짐에 따라 점차 줄어드는 것을 확인할 수 있는데, 종래의 EGR 냉각장치는 냉매제로서 냉각수를 사용하기 때문에 냉매제의 온도를 원하는 온도(예를들면 15℃)로 낮출 수 없게되고, 이에의해 EGR 가스의 냉각효율이 나빠져서 전체적인 EGR 시스템의 효과가 떨어지게되는 문제점이 발생하는 것이다.That is, the amount of NOx and soot generated in the exhaust gas according to the temperature of the refrigerant supplied to the EGR cooler is lowered to 80 ° C, 60 ° C, 30 ° C, and 15 ° C as shown in FIG. As the conventional EGR cooling device uses cooling water as the refrigerant agent, the temperature of the refrigerant agent cannot be lowered to a desired temperature (for example, 15 ° C), and thus the cooling efficiency of the EGR gas is deteriorated. The problem is that the effect of the EGR system is reduced.

따라서, 상기 문제점을 해결하기 위한 본 발명은 에어콘용 냉매를 매개체로하여 EGR 가스를 냉각하도록 EGR쿨러를 구성하고, 엔진의 운전조건에 따라 상기 EGR쿨러로 공급되는 저온의 냉매 공급량을 조절하는 냉매공급수단을 구성하므로서, 저온의 냉매로서 EGR 가스를 냉각시키므로 EGR 냉각장치의 냉각효율이 향상되고, 엔진 운전조건에 따라 상온 EGR과 저온 EGR이 별도의 바이패스 밸브 및 파이프 없이 구현되며, 제품의 구조를 단순화하여 조립공정 및 생산성의 향상의 효과를 기대할 수 있도록 한 EGR 냉각장치를 제공함을 목적으로 한다.Accordingly, the present invention for solving the above problems is configured to configure the EGR cooler to cool the EGR gas by using the medium for the air conditioner, the refrigerant supply to adjust the low-temperature refrigerant supplied to the EGR cooler according to the operating conditions of the engine By constituting the means, the cooling efficiency of the EGR cooling system is improved by cooling the EGR gas as a low temperature refrigerant, and the room temperature EGR and the low temperature EGR are realized without separate bypass valves and pipes according to the engine operating conditions. It is an object of the present invention to provide an EGR cooling device that can simplify the assembly process and improve productivity.

상기 목적달성을 위한 본 발명은,The present invention for achieving the above object,

콤프레서, 콘덴서, 리시버 드라이어와 같은 에어컨용 냉매 순환시스템을 구비하고, 배기매니폴드에서 배출되는 배기가스의 일부를 흡기측으로 재순환시키는 EGR 시스템을 구비한 것에 있어서,In the case of having a refrigerant circulation system for air conditioners such as a compressor, a condenser, and a receiver dryer, and having an EGR system for recycling a part of the exhaust gas discharged from the exhaust manifold to the intake side,

배기매니폴드에서 배출된 EGR 가스를 냉각시켜 흡기매니폴드 측으로 공급하는 EGR 쿨러를 형성하되, An EGR cooler is formed to cool the EGR gas discharged from the exhaust manifold and supply it to the intake manifold.

상기 EGR 쿨러는 에어콘용 냉매가 통과하는 냉매순환관이 EGR 파이프의 외곽을 감싸도록 형성하여 상기 EGR 쿨러가 에어컨용 냉매를 냉매제로하여 EGR 가스를 냉각시키도록 하고, The EGR cooler is formed so that the refrigerant circulation tube through which the refrigerant for air conditioning passes around the outside of the EGR pipe so that the EGR cooler cools the EGR gas using the refrigerant for the air conditioner as a refrigerant.

콘덴서의 출력단으로부터 냉매공급라인을 분기시켜 냉매공급라인이 냉매순환관에 연결되도록 하며, 상기 냉매 공급라인의 도중에 고온, 고압의 액상 냉매를 저온,저압의 액상냉매로 감압시키기 위한 오리피스를 형성하고, 상기 냉매순환관의 입구측에 배기가스의 온도에 따라 개도량이 가변되어 냉매 공급량이 조절되도록 하는 냉매제어밸브를 형성한 것을 특징으로 한다.Branching the refrigerant supply line from the output terminal of the condenser so that the refrigerant supply line is connected to the refrigerant circulation pipe, forming an orifice for reducing the high-temperature, high-pressure liquid refrigerant to low-temperature, low-pressure liquid refrigerant in the middle of the refrigerant supply line, A refrigerant control valve may be formed at an inlet side of the refrigerant circulation tube so that the opening amount is varied according to the temperature of the exhaust gas so that the refrigerant supply amount is adjusted.

그리고, 상기 냉매 제어밸브는,And, the refrigerant control valve,

냉매순환관의 입구측에 밸브하우징을 형성하고, 밸브하우징 내부에 그 일측이 스프링에 탄지된 상태로 냉매공급라인의 개도량을 조절하는 피스톤을 형성하되,A valve housing is formed at the inlet side of the refrigerant circulation pipe, and a piston for controlling the opening amount of the refrigerant supply line is formed in one side of the valve housing, which is supported by a spring.

상기 피스톤의 타측에 배기가스의 온도에 따라 수축 또는 팽창하면서 피스톤을 구동시켜 냉매순환관으로의 냉매공급량이 조절되도록 하는 왁스를 형성한 것을 특징으로 한다.The other side of the piston is characterized in that the wax is formed to adjust the amount of refrigerant supplied to the refrigerant circulation pipe by driving the piston while shrinking or expanding in accordance with the temperature of the exhaust gas.

이하, 첨부된 도면 도 1 내지 도 3 을 참조하여 본 발명의 바람직한 실시예를 설명하면 다음과 같다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, FIGS. 1 to 3.

도면부호 1 은 엔진을 나타내며, 상기 엔진에는 흡기를 공급하는 흡기매니폴드(3)와 엔진(1)에서 배출된 배기가스를 배출하는 배기매니폴드(2)가 형성되어 있다.Reference numeral 1 denotes an engine, and the engine is provided with an intake manifold 3 for supplying intake air and an exhaust manifold 2 for exhausting the exhaust gas discharged from the engine 1.

그리고 차량에는 냉방기능을 위해 에어콘용 냉매를 순환시키는 시스템으로서, 증발기(4), 콤프레서(5), 콘덴서(6), 리시버 드라이어(7), 팽창밸브(8) 등이 구성되며 냉매는 별도의 냉매라인(9)을 통해 순환하게된다.In addition, the vehicle is a system for circulating the refrigerant for the air conditioner for the cooling function, the evaporator (4), the compressor (5), the condenser (6), the receiver dryer (7), expansion valve (8) is composed of a separate refrigerant. It is circulated through the refrigerant line (9).

증발기(4)를 통과한 냉매는 콤프레서(5)에서 고온, 고압의 가스로 압축되어 콘덴서(6)로 공급되고, 상기 콘덴서(6)는 공급된 고온, 고압의 가스상태의 냉매를 액체상태로 응축시켜 리시버 드라이어(7)로 공급하며, 액체상태의 냉매는 리시버 드라이어(7)를 통과하면서 수분과 먼지가 제거된 후 팽창밸브(8)를 통과하게되며, 상기 팽창밸브(8)를 통과하는 냉매는 급격히 팽창되면서 저온, 저압의 안개상태가되어 증발기(4)로 재공급되고, 증발기(4)로 공급된 저온, 저압의 냉매는 블로워로부터 송풍된 공기와 열교환하면서 주위의 열을 빼앗아 안개상태의 냉매에서 가스상태로 기화되어 다시 콤프레서(5)로 공급되므로서, 냉매가 지속적으로 재순환되면서 냉방기능이 구현된다.The refrigerant passing through the evaporator (4) is compressed into a gas of high temperature and high pressure in the compressor (5) and supplied to the condenser (6). The condenser (6) converts the supplied high temperature and high pressure gas state refrigerant into a liquid state. Condensation is supplied to the receiver dryer (7), and the liquid refrigerant passes through the expansion valve (8) after water and dust are removed while passing through the receiver dryer (7), and passes through the expansion valve (8). The refrigerant expands rapidly and becomes a low temperature, low pressure fog state, and is re-supplied to the evaporator 4, and the low temperature and low pressure refrigerant supplied to the evaporator 4 takes heat from the blower while exchanging heat with the blown air, resulting in a fog state. The vaporization of the refrigerant in the gas state is supplied back to the compressor (5), the refrigerant is continuously recycled while the cooling function is implemented.

한편, 본 발명의 EGR 냉각장치는 상기와같이 냉방기능을 위해 순환되는 에어콘용 냉매를 냉매제로하여 EGR 가스를 냉각하도록 하며, 이를위해 EGR 쿨러(10)를 도 2 에 도시된 바와같이 EGR 파이프(11)의 외곽으로 에어콘용 냉매가 통과하는 냉매순환관(12)이 감싸도록 구성하여 EGR 파이프(11)를 통과하는 EGR 가스가 냉매순환관(12)을 통과하는 냉매에 의해 냉각되도록 구성한다.On the other hand, the EGR cooling device of the present invention to cool the EGR gas by using the refrigerant for the air conditioner circulated for the cooling function as described above as a refrigerant, for this purpose, the EGR cooler 10 as shown in Figure 2 EGR pipe ( It is configured to surround the refrigerant circulation tube 12 through which the air conditioner refrigerant passes through 11) so that the EGR gas passing through the EGR pipe 11 is cooled by the refrigerant passing through the refrigerant circulation tube 12.

상기 냉매순환관(12)의 입구측은 콘덴서(6)의 출력측에 위치한 냉매라인(9)으로부터 분기된 냉매공급라인(15)과 연결되도록 하고, 상기 냉매공급라인(15)의 도중에 냉매공급라인(15)을 통과하는 고온, 고압의 액체 냉매를 저온, 저압의 액체 냉매로 감압시켜주기 위한 오리피스(14)를 형성하여 상기 냉매순환관(12)으로 저온의 냉매가 공급될 수 있도록 한다.The inlet side of the refrigerant circulation pipe 12 is connected to the refrigerant supply line 15 branched from the refrigerant line 9 located at the output side of the condenser 6, and the refrigerant supply line (15) in the middle of the refrigerant supply line (15). An orifice 14 is formed to reduce the high temperature and high pressure liquid refrigerant through 15) to the low temperature and low pressure liquid refrigerant so that the low temperature refrigerant can be supplied to the refrigerant circulation tube 12.

상기 냉매순환관(12)으로 공급되는 냉매의 온도는 오리피스(14)의 기능에 따라 필요온도로 냉각시킬 수 있도록 하며, 이를통해 필요한 경우 냉매를 15℃ 까지 냉각시킬 수 있도록 한다.The temperature of the refrigerant supplied to the refrigerant circulation tube 12 may be cooled to a required temperature according to the function of the orifice 14, and through this, the refrigerant may be cooled to 15 ° C. if necessary.

그리고, 상기 냉매순환관(12)의 출구측에는 냉매리턴라인(13)을 연결하는데, 상기 냉매리턴라인(13)은 증발기(4)와 콤프레서(5)를 상호 연결하는 냉매라인(9)과 연결되도록 하여 냉매순환관(12)을 통과한 냉매가 콤프레서(5)로 재공급될 수 있도록 한다.The refrigerant return line 13 is connected to an outlet side of the refrigerant circulation tube 12, and the refrigerant return line 13 is connected to a refrigerant line 9 connecting the evaporator 4 and the compressor 5 to each other. The refrigerant passing through the refrigerant circulation tube 12 may be supplied to the compressor (5) again.

한편, 상기 냉매순환관(12)의 입구측에는 엔진의 운전조건에 따라 개도량이 가변되는 냉매제어밸브(16)를 형성하는데, 상기 냉매제어밸브(16)는 냉매순환관(12)의 입구측에 밸브하우징(17)을 별도로 형성하고, 상기 밸브하우징(17) 내부에 그 일측이 스프링(18)에 탄지된 상태로 슬라이딩 구동되어 냉매공급라인(15)의 개도량을 조절하는 피스톤(19)을 형성하며, 상기 피스톤(19)의 타측에 배기가스의 온도에 따라 수축 또는 팽창하면서 피스톤(19)을 슬라이딩 구동시켜 냉매순환관(12)으로 공급되는 냉매 공급량이 조절되도록 하는 왁스(20)를 형성하여 구성한다.Meanwhile, at the inlet side of the refrigerant circulation tube 12, a refrigerant control valve 16 having an opening amount variable according to an operating condition of the engine is formed, and the refrigerant control valve 16 is located at the inlet side of the refrigerant circulation tube 12. The valve housing 17 is formed separately, and the piston 19 slidingly driven in a state in which one side is supported by the spring 18 inside the valve housing 17 controls the opening amount of the refrigerant supply line 15. The wax 20 is formed on the other side of the piston 19 to slide and drive the piston 19 while contracting or expanding according to the temperature of the exhaust gas so that the amount of refrigerant supplied to the refrigerant circulation tube 12 is adjusted. To configure.

이와같이 구성된 본 발명의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention configured as described above are as follows.

엔진이 구동하면, 콤프레서(5)가 구동하여 냉매라인(9)을 통해 냉매가 순환하도록 하며, 콘덴서(6)에서 배출된 고온, 고압의 액체상태 냉매의 일부가 냉매공급라인(15)을 통해 오리피스(14)로 공급되고, 상기 오리피스(14)는 공급된 고온, 고압의 냉매를 저온, 저압의 냉매로 감압하여 EGR 쿨러(10) 측으로 배출한다.When the engine is driven, the compressor (5) is driven to circulate the refrigerant through the refrigerant line (9), a portion of the high-temperature, high-pressure liquid state refrigerant discharged from the condenser (6) through the refrigerant supply line (15) The orifice 14 is supplied to the orifice 14, and the orifice 14 decompresses the supplied high temperature and high pressure refrigerant into a low temperature and low pressure refrigerant to discharge to the EGR cooler 10.

이때, 엔진이 저부하상태로 운전되면 엔진(1)에서 배출되는 배기가스 온도 또한 상대적으로 낮아지므로 냉매제어밸브(16)의 왁스(20) 팽창량이 도 3 의 (a)와 같이 작아져 피스톤(19)을 짧은거리 슬라이딩 구동시키며, 이에의해 피스톤(19)이 냉매공급라인(15)을 좁게 개방시켜 냉매순환관(12)으로 적은양의 냉매가 공급되도록 한다.At this time, since the exhaust gas temperature discharged from the engine 1 is also relatively low when the engine is operated at a low load state, the amount of expansion of the wax 20 of the refrigerant control valve 16 is reduced as shown in FIG. 19 is driven by a short distance sliding, whereby the piston 19 narrowly opens the refrigerant supply line 15 so that a small amount of refrigerant is supplied to the refrigerant circulation tube (12).

상기 냉매순환관(12)으로 적은양의 냉매가 공급되면 EGR 파이프(11)를 통과하는 EGR 가스의 냉각량이 줄어들게되어 흡기매니폴드(3) 측으로 비교적 상온의 EGR 가스가 공급된다.When a small amount of refrigerant is supplied to the refrigerant circulation tube 12, the amount of cooling of the EGR gas passing through the EGR pipe 11 is reduced, so that the EGR gas at a relatively room temperature is supplied to the intake manifold 3.

즉, 엔진이 저부하상태로 운전될때에는 흡기매니폴드(3) 측으로 상온의 EGR가스가 공급되는 이른바 상온 EGR이 구현되어 배기가스중의 CO, HC, 매연 등이 저감되도록 하는 것이다.That is, when the engine is operated at a low load state, so-called room temperature EGR is supplied to which the EGR gas at room temperature is supplied to the intake manifold 3 side to reduce CO, HC, soot, etc. in the exhaust gas.

한편, 엔진이 고부하상태로 운전되면 엔진(1)에서 배출되는 배기가스 온도가 상대적으로 높아지므로 냉매제어밸브(16)의 왁스(20) 팽창량이 증대되어 도 3 의 (b)와같이 피스톤(19)을 멀리 슬라이딩 구동시키게되고, 이에의해 피스톤(19)이 냉매공급라인(15)을 넓게 개방시켜 냉매순환관(12)으로 많은양의 냉매가 공급되게 된다.On the other hand, when the engine is operated at a high load state, the exhaust gas temperature discharged from the engine 1 becomes relatively high, so that the amount of expansion of the wax 20 of the refrigerant control valve 16 is increased, so that the piston 19 as shown in FIG. ), The piston 19 is opened so that the piston 19 wide open the refrigerant supply line 15 to supply a large amount of refrigerant to the refrigerant circulation tube (12).

냉매순환관(12)으로 많은양의 냉매가 공급되면 EGR 파이프(11)를 통과하는 EGR 가스가 냉매에 많은 열을 빼앗기게 되므로 저온으로 냉각된 EGR 가스가 흡기매니폴드(3)를 통해 엔진(1)으로 공급되어 배기가스중의 NOx 및 매연의 발생량이 현저히 줄어들게 되는 것이다.When a large amount of refrigerant is supplied to the refrigerant circulation tube 12, the EGR gas passing through the EGR pipe 11 is deprived of a lot of heat in the refrigerant, so that the EGR gas cooled to low temperature is supplied to the engine through the intake manifold 3. It is supplied to 1) and the amount of NOx and soot generated in the exhaust gas is significantly reduced.

그리고, 본 발명에서는 오리피스(14)의 용량을 어떻게 설정하는가에 따라 EGR 쿨러(10)로 공급되는 냉매의 온도를 최적의 상태인 15℃ 까지 낮춰줄 수 있게되므로, 상온 EGR 및 저온 EGR 뿐만 아니라 배기가스중의 NOx 및 매연의 발생량을 현저히 감쇄시킬 수 있도록 하는 효과를 기대할 수 있다.In addition, according to the present invention, the temperature of the refrigerant supplied to the EGR cooler 10 may be lowered to an optimum state of 15 ° C. according to how the capacity of the orifice 14 is set, so that not only normal temperature EGR and low temperature EGR but also exhaust The effect of remarkably reducing the amount of NOx and soot in the gas can be expected.

이상에서 설명한 바와같이 본 발명은 에어콘용 냉매를 매개체로하여 EGR 가스를 냉각하도록 EGR쿨러를 구성하고, 엔진의 운전조건에 따라 상기 EGR쿨러로 공급되는 저온의 냉매 공급량을 조절하는 냉매공급수단을 구성하므로서, 저온의 냉매로서 EGR 가스를 냉각시키므로 EGR 냉각장치의 냉각효율이 향상되고, 엔진 운전조건에 따라 상온 EGR과 저온 EGR이 별도의 바이패스 밸브 및 파이프 없이 구현되며, 제품의 구조를 단순화하여 조립공정 단축 및 생산성 향상의 효과를 기대할 수 있도록 한 EGR 냉각장치를 제공하는 효과를 기대할 수 있다.As described above, the present invention configures the EGR cooler to cool the EGR gas through the medium for the air conditioner, and configures the refrigerant supply means for controlling the low temperature refrigerant supply amount supplied to the EGR cooler according to the operating conditions of the engine. Therefore, cooling the EGR gas as a low temperature refrigerant improves the cooling efficiency of the EGR cooling system, and according to the engine operating conditions, room temperature EGR and low temperature EGR are realized without separate bypass valves and pipes, and the product structure is simplified and assembled. The effect of providing an EGR chiller that can be expected to shorten the process and improve productivity is expected.

도 1 은 본 발명의 EGR 냉각장치를 보인 도면.1 is a view showing an EGR cooling device of the present invention.

도 2 는 본 발명에 적용된 EGR 쿨러를 보인 단면도.2 is a cross-sectional view showing an EGR cooler applied to the present invention.

도 3 의 (a)(b)는 본 발명에 적용된 냉매제어밸브의 작동상태를 보인 도면.Figure 3 (a) (b) is a view showing the operating state of the refrigerant control valve applied to the present invention.

도 4 는 종래의 EGR 냉각장치를 보인 도면.4 is a view showing a conventional EGR cooling device.

도 5 는 EGR 냉매제의 온도에 따른 NOx와 매연의 발생량을 비교한 그래프.5 is a graph comparing the generation amount of NOx and soot according to the temperature of the EGR refrigerant.

※ 도면의 주요부분에 대한 부호의 설명※ Explanation of code for main part of drawing

1 : 엔진 2 : 배기매니폴드 1: engine 2: exhaust manifold

3 : 흡기매니폴드 4 : 증발기3: intake manifold 4: evaporator

5 : 콤프레서 6 : 콘덴서5: compressor 6: capacitor

7 : 리시버 드라이어 8 : 팽창밸브7: receiver drier 8: expansion valve

9 : 냉매라인 10 : EGR 쿨러9: refrigerant line 10: EGR cooler

11 : EGR 파이프 12 : 냉매순환관11: EGR pipe 12: refrigerant circulation pipe

13 : 냉매리턴라인 14 : 오리피스 13: refrigerant return line 14: orifice

15 : 냉매공급라인 16 : 냉매제어밸브15: refrigerant supply line 16: refrigerant control valve

17 : 밸브하우징 18 : 스프링17: valve housing 18: spring

19 : 피스톤 20 : 왁스19: piston 20: wax

Claims (2)

콤프레서(5), 콘덴서(6), 리시버 드라이어(7)와 같은 에어컨용 냉매 순환시스템을 구비하고, 배기매니폴드(2)에서 배출되는 배기가스의 일부를 흡기측으로 재순환시키는 EGR 시스템을 구비한 것에 있어서,A refrigerant circulation system for an air conditioner such as a compressor (5), a condenser (6), and a receiver dryer (7), and an EGR system for recirculating part of the exhaust gas discharged from the exhaust manifold (2) to the intake side, In 배기매니폴드(2)에서 배출된 EGR 가스를 냉각시켜 흡기매니폴드(3) 측으로 공급하는 EGR 쿨러를 형성하되, Form an EGR cooler for cooling the EGR gas discharged from the exhaust manifold (2) to supply to the intake manifold (3) side, 상기 EGR 쿨러(10)는 에어콘용 냉매가 통과하는 냉매순환관(12)이 EGR 파이프(11)의 외곽을 감싸도록 형성하여 상기 EGR 쿨러(10)가 에어컨용 냉매를 냉매제로하여 EGR 가스를 냉각시키도록 하고, The EGR cooler 10 is formed so that the refrigerant circulation pipe 12 through which the refrigerant for air conditioner passes around the EGR pipe 11 so that the EGR cooler 10 uses the air conditioner refrigerant as a refrigerant to cool the EGR gas. Let's make it 콘덴서(6)의 출력단으로부터 냉매공급라인(15)을 분기시켜 냉매공급라인(15)이 냉매순환관(12)에 연결되도록 하며, 상기 냉매 공급라인(15)의 도중에 고온, 고압의 액상 냉매를 저온,저압의 액상냉매로 감압시키기 위한 오리피스(14)를 형성하고, 상기 냉매순환관(12)의 입구측에 배기가스의 온도에 따라 개도량이 가변되어 냉매 공급량이 조절되도록 하는 냉매제어밸브(16)를 형성한 것을 특징으로 하는 EGR 냉각장치.The refrigerant supply line 15 is branched from the output end of the condenser 6 so that the refrigerant supply line 15 is connected to the refrigerant circulation pipe 12. The liquid refrigerant of high temperature and high pressure is supplied in the middle of the refrigerant supply line 15. Refrigerant control valve 16 to form an orifice (14) for reducing the low-pressure, low-pressure liquid refrigerant, and the opening amount is changed in accordance with the temperature of the exhaust gas at the inlet side of the refrigerant circulation tube (12) EGR chiller characterized in that) formed. 제 1 항에 있어서, The method of claim 1, 상기 냉매 제어밸브(16)는,The refrigerant control valve 16, 냉매순환관(12)의 입구측에 밸브하우징(17)을 형성하고, 밸브하우징(17) 내부에 그 일측이 스프링(18)에 탄지된 상태로 냉매공급라인(15)의 개도량을 조절하는 피스톤(19)을 형성하되,The valve housing 17 is formed at the inlet side of the refrigerant circulation tube 12, and the opening of the refrigerant supply line 15 is adjusted in a state in which one side of the valve housing 17 is supported by the spring 18. Form a piston (19), 상기 피스톤(19)의 타측에 배기가스의 온도에 따라 수축 또는 팽창하면서 피스톤(19)을 구동시켜 냉매순환관(12)으로의 냉매공급량이 조절되도록 하는 왁스(20)를 형성한 것을 특징으로 하는 EGR 냉각장치.On the other side of the piston 19 is characterized in that the wax 20 is formed to drive the piston 19 while the contraction or expansion according to the temperature of the exhaust gas to control the amount of refrigerant supplied to the refrigerant circulation pipe (12). EGR Chiller.
KR10-2003-0071664A 2003-10-15 2003-10-15 EGR cooling system KR100528205B1 (en)

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