KR20230053890A - Refrigerant Control Method of Urea Injector Cooling System of Exchanging Heat with Radiator - Google Patents
Refrigerant Control Method of Urea Injector Cooling System of Exchanging Heat with Radiator Download PDFInfo
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- KR20230053890A KR20230053890A KR1020210137214A KR20210137214A KR20230053890A KR 20230053890 A KR20230053890 A KR 20230053890A KR 1020210137214 A KR1020210137214 A KR 1020210137214A KR 20210137214 A KR20210137214 A KR 20210137214A KR 20230053890 A KR20230053890 A KR 20230053890A
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- radiator
- urea water
- refrigerant
- water injector
- cooling system
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- 239000003507 refrigerant Substances 0.000 title claims abstract description 34
- 238000001816 cooling Methods 0.000 title claims abstract description 26
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000004202 carbamide Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002826 coolant Substances 0.000 claims abstract description 10
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims description 59
- 239000000498 cooling water Substances 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
- 239000007789 gas Substances 0.000 description 11
- 238000006722 reduction reaction Methods 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/06—Arrangements for cooling other engine or machine parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
- F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1433—Pumps
- F01N2610/144—Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
본 발명은 라디에이터와 열교환하는 요소수 인젝터 냉각 시스템 및 그 냉매제어방법에 관한 것으로 과열된 요소수 인젝터의 냉매를 냉각하는 장치 및 방법에 관한 것이다.The present invention relates to a urea water injector cooling system that exchanges heat with a radiator and a refrigerant control method thereof, and relates to a device and method for cooling a refrigerant of an overheated urea water injector.
디젤차량은 연료로 사용되는 경유의 불완전연소에 따라 일산화탄소나 탄화수소, 질소산화물 등의 유해물질이 배기가스에 다량 함유되어 대기중으로 배출될 수 있으나, 디젤엔진의 성능 향상에 따라 최근에는 불완전연소에 따른 일산화탄소나 탄화수소의 배출량이 현저히 저감된 디젤엔진이 개발되어 사용되고 있다.Due to the incomplete combustion of diesel used as fuel, diesel vehicles contain a large amount of harmful substances such as carbon monoxide, hydrocarbons, and nitrogen oxides in the exhaust gas and can be discharged into the atmosphere. A diesel engine in which carbon monoxide or hydrocarbon emissions are significantly reduced has been developed and used.
디젤엔진의 배기가스 중 대부분을 차지하는 질소산화물(NOx)은 별도의 배기가스저감장치에 의해 질소가스(N2)로 환원처리되어 배출되도록 되어 있으며, 이에 따라 기존 디젤차량의 배기장치와 비교했을 때 상대적으로 질소산화물의 처리효율이 높은 선택적환원촉매(SCR, selective catalytic reduction)를 이용한 배기가스저감장치가 사용되고 있다.Nitrogen oxide (NOx), which accounts for most of the exhaust gas of diesel engines, is reduced to nitrogen gas (N2) by a separate exhaust gas reduction device and discharged. As a result, an exhaust gas reduction device using a selective catalytic reduction (SCR) with high nitrogen oxide treatment efficiency is used.
따라서 배기계에 선택 환원형 NOx 촉매(SCR 촉매)를 설치하여, 암모니아를 환원제로 하여 NOx를 질소와 물로 환원하는 기술이 개발되었다. 이는 배기관의 내부에 배치되는 요소수 분사모듈로부터 요소수를 배기중에 공급하여, 배기의 열에 의해 요소수로부터 암모니아를 생성함으로써 NOx를 질소와 물로 환원하는 것이다. Therefore, a technique for reducing NOx to nitrogen and water using ammonia as a reducing agent by installing a selective reduction NOx catalyst (SCR catalyst) in the exhaust system has been developed. This is to reduce NOx to nitrogen and water by supplying urea water into the exhaust from a urea water injection module disposed inside the exhaust pipe and generating ammonia from the urea water by the heat of the exhaust.
선택적환원촉매를 이용한 배기가스 저감장치가 적절하게 동작하여 배기가스에서 질소산화물을 제거하기 위해서는 요소나 암모니아 등이 주성분인 요소수를 산화제로서 배기가스에 공급하고 분무하여야 하므로, 선택적환원촉매를 이용한 배기가스 저감장치를 채용한 디젤차량에는 요소수를 공급하기 위한 요소수 탱크(우레아탱크, Urea Tank)가 장착되어 있다. In order for the exhaust gas reduction device using a selective reduction catalyst to operate properly and remove nitrogen oxides from the exhaust gas, urea water, the main component of which is urea or ammonia, must be supplied and sprayed to the exhaust gas as an oxidizing agent. A diesel vehicle adopting a gas reduction device is equipped with a urea water tank (urea tank) for supplying urea water.
요소수는 차량이 운행되어 배기가스가 배출됨에 따라 소모되므로 선택적환원촉매장치에서 환원처리가 원활하게 이루어지지 않아 배기가스 저감장치에 의한 배기가스 저감이 이루어지지 않아, 주기적으로 요소수를 요소수탱크에 주입해야하며, 인젝터의 과열로 인해 요소수 기화가 발생하게 되어 분사 특성을 악화시킬 수 있다.Since urea water is consumed as the vehicle runs and exhaust gas is discharged, the reduction treatment in the selective reduction catalyst device is not performed smoothly, and the exhaust gas reduction by the exhaust gas reduction device is not performed. urea water vaporization may occur due to overheating of the injector, which may deteriorate the injection characteristics.
본 발명은 상기와 같은 문제를 해결하기 위해 발명된 것으로서, 라디에이터를 통과하는 외부공기를 이용하여 요소수 냉매를 냉각함으로서 요소수 인젝터의 과열을 방지하는데 목적이 있다.The present invention was invented to solve the above problems, and an object of the present invention is to prevent overheating of the urea water injector by cooling the urea water refrigerant using external air passing through the radiator.
본 발명은 일 실시예인 요소수 인젝터 냉각 시스템에 있어서, 요소수를 배기후처리장치에 분사하는 요소수 인젝터; 상기 요소수 인젝터와 열교환되는 냉매를 순환시키는 냉각수 펌프; 상기 냉각수 펌프에 의해 라디에이터로 유입된 냉매는 상기 라디에이터를 통과하는 차량의 외부공기에 의해 냉각되는 것을 특징으로 하는 라디에이터와 열교환하는 요소수 인젝터 냉각 시스템에 관한 것이다.The present invention provides a urea solution injector cooling system according to an embodiment, comprising: a urea solution injector for injecting urea solution into an exhaust aftertreatment device; a cooling water pump circulating a refrigerant that exchanges heat with the urea water injector; The urea water injector cooling system exchanging heat with the radiator, characterized in that the refrigerant introduced into the radiator by the cooling water pump is cooled by the outside air of the vehicle passing through the radiator.
본 발명의 다른 실시예인 라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법에 있어서, 차량의 배기 후처리장치로 요소수 분사모드 작동단계; 배기온이 기 설정된 제1 설정온도보다 높고, 제2 설정온도보다 낮으면 요소수 인젝터를 작동하며, 상기 배기온이 상기 제2 설정온도보다 높으면 상기 요소수 인젝터와 열교환되는 냉매를 순환시키는 냉각수 펌프 작동 온하는 것을 특징으로 한다.In another embodiment of the present invention, in the refrigerant control method of a urea water injector cooling system that exchanges heat with a radiator, the urea water injection mode operation step as an exhaust post-treatment device of a vehicle; When the exhaust temperature is higher than the first set temperature and lower than the second set temperature, the urea water injector is operated, and when the exhaust temperature is higher than the second set temperature, the cooling water pump circulates the refrigerant that exchanges heat with the urea water injector. It is characterized in that it works.
또한, 본 발명은 냉각수 펌프 작동 온 시, 냉매는 상기 냉각수 펌프에 의해 라디에이터로 유입되어 외부공기와 열교환 되며, 상기 라디에이터의 냉매 온도가 제2 설정온도보다 높으면, 상기 요소수 인젝터 작동을 오프하고, 상기 냉각수 펌프를 작동을 온한다.In the present invention, when the cooling water pump is turned on, the refrigerant flows into the radiator by the cooling water pump and exchanges heat with external air, and when the refrigerant temperature of the radiator is higher than the second set temperature, the urea water injector is turned off, Turn on the cooling water pump.
또한, 본 발명은 상기 라디에이터의 냉매 온도가 제2 설정온도보다 낮으면, 상기 요소수 인젝터를 작동 온 시, 상기 냉각수 펌프를 작동을 오프하며, 상기 제1 설정온도 < 제2 설정온도이다.In addition, when the refrigerant temperature of the radiator is lower than the second set temperature, the cooling water pump is turned off when the urea water injector is turned on, and the first set temperature < the second set temperature.
또한, 본 발명은 시동 오프 전까지는 상기 요소수 분사모드 작동단계가 계속된다.In addition, in the present invention, the urea water injection mode operation step continues until the ignition is turned off.
본 발명에 따르면, 차량의 냉각계 구성을 변형시키지 않고 요소수 냉매의 냉각이 가능하고, 냉각 시기를 배기온에 따라 제어함으로서, 효율적인 요소수 인젝션이 가능하다.According to the present invention, it is possible to cool the urea water refrigerant without changing the configuration of the cooling system of the vehicle, and efficient urea water injection is possible by controlling the cooling timing according to the exhaust temperature.
도 1은 종래의 요소수 인젝터를 냉각을 위해 엔진의 냉각수를 이용하는 개념도이다.
도 2는 본 발명의 라디에이터를 이용한 요소수 인젝터 냉매 냉각의 개념도이다.
도 3은 본 발명에서 라디에이터를 이용해 열교환하는 방법에 대한 플로챠트이다.1 is a conceptual diagram using engine cooling water to cool a conventional urea water injector.
2 is a conceptual diagram of urea water injector refrigerant cooling using the radiator of the present invention.
3 is a flow chart of a method for exchanging heat using a radiator in the present invention.
본 발명을 충분히 이해하기 위해서 본 발명의 바람직한 실시 예를 첨부 도면을 참조하여 설명한다. 본 발명의 실시 예는 여러 가지 형태로 변형될 수 있으며, 본 발명의 범위가 아래에서 상세히 설명하는 실시 예로 한정되는 것으로 해석되어서는 안 된다. 본 실시 예는 당 업계에서 평균적인 지식을 가진 자에게 본 발명을 보다 완전하게 설명하기 위해서 제공 되어지는 것이다. 따라서 도면에서의 요소의 형상 등은 보다 명확한 설명을 강조하기 위해서 과장되어 표현될 수 있다. 각 도면에서 동일한 구성은 동일한 참조부호로 도시한 경우가 있음을 유의하여야 한다. 본 발명의 요지를 불필요하게 흐릴 수 있다고 판단되는 공지 기능 및 구성에 대한 상세한 기술은 생략된다.In order to fully understand the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the examples described in detail below. This embodiment is provided to more completely explain the present invention to those with average knowledge in the art. Accordingly, the shapes of elements in the drawings may be exaggerated to emphasize a clearer explanation. It should be noted that in each drawing, the same configuration may be indicated by the same reference numerals. Detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention are omitted.
SCR 시스템에서 요소수를 배기계에 분사하기 위하여 인젝터를 사용한다. 이때, 배기계의 온도에 의해 요소수 인젝터의 열해 문제가 발생하게 된다. 또한, 열전달에 의한 요소수 기화가 발생하게 되어 분사 특성에 영향을 미치게 된다. 이러한 현상을 방지하기 위하여 차량 배기계에 장착된 요소수 인젝터는 공냉 혹은 수냉장치를 장착한다.수냉식 요소수 인젝터의경우, 엔진 냉각수를 이용하여 순환시킴으로써 요소수인젝터의 온도를 냉각시킨다. 이러한 구성을 갖추게 되었을 때, 요소수 인젝터의 위치에 따라서 문제가 발생할 수 있게 되어 본 발명을 적용하게 된다. In the SCR system, an injector is used to inject urea water into the exhaust system. At this time, the problem of thermal damage of the urea water injector occurs due to the temperature of the exhaust system. In addition, vaporization of urea water occurs due to heat transfer, which affects spray characteristics. In order to prevent this phenomenon, the urea water injector installed in the vehicle exhaust system is equipped with an air-cooling or water-cooling device. In the case of the water-cooled urea water injector, the temperature of the urea water injector is cooled by circulating it using engine cooling water. When this configuration is provided, a problem may occur depending on the location of the urea solution injector, and the present invention is applied.
요소수 인젝터가 엔진룸 내부 혹은 근방에 구성될 경우에는 냉각수 관로가 짧아 문제가 없으나, 차량 하부 혹은 차량 후방에 위치할 경우에는 엔진룸으로부터냉각수를 가져와야 하는 관로가 길어져 문제가 발생하게 된다. 길어진 길이에 의한 관로 저항의 발생으로 냉각수 펌프의 부하가 증가하게 되어, 엔진의 출력 저하 문제가 발생하게 되며, 배기계로부터의 발열량을 회수해오게 되어 냉각수 온도가 상승하게 됨으로써, 엔진 출력 저하 문제가 발생하게 된다. 또한, 늘어난 냉각수 관로로 인하여 냉각수 누수의 위험이 증가하게 된다. When the urea water injector is configured in or near the engine room, the cooling water pipe is short and there is no problem. However, when the urea water injector is located under the vehicle or at the rear of the vehicle, the pipe for bringing the cooling water from the engine room becomes long, causing a problem. The load on the cooling water pump increases due to the generation of duct resistance due to the longer length, resulting in a problem of reducing engine output, and the problem of reducing engine output by recovering the heat generated from the exhaust system and increasing the temperature of the cooling water. will do In addition, the risk of cooling water leakage increases due to the increased cooling water pipe.
도 1은 요소수 인젝터를 냉각시키기 위해 엔진의 냉각수를 이용하는 개념도이다. 요소수 인젝터를 냉각시키는 냉매로서 엔진 냉각수를 사용하고 엔진 냉각수와 관로 연결을 한다. 그러나, 도 1은 냉각 관로가 증가하게 되어 워터펌프의 부하가 늘어남으로써 엔진의 부하 증가의 원인이 된다. 인젝터가 배기관으로부터 받는 열원을 차단하게 되는 것이므로 냉각수 온도가 상승하게 되어 엔진 효율 저하의 원인이 된다. 1 is a conceptual diagram of using cooling water of an engine to cool a urea water injector. Engine cooling water is used as a refrigerant to cool the urea water injector, and the engine cooling water and pipe are connected. However, FIG. 1 causes an increase in the load of the engine by increasing the load of the water pump due to the increase in the cooling pipe. Since the injector blocks the heat source received from the exhaust pipe, the coolant temperature rises, which causes a decrease in engine efficiency.
도 2는 요소수 인젝터 냉매의 냉각을 위해 라디에이터를 이용한 개념도이다. 요소수 인젝터 과열 시, 냉각수 펌프를 통해 냉매를 라디에이터로 공급하면, 라디에이터를 통과하는 외부 공기에 의해 열교환이 이루어진다. 이는 엔진 냉각을 위한 라디에이터가 아닌 별도에 구비되는 라이에이터 일 수 있다.2 is a conceptual diagram using a radiator for cooling the refrigerant of the urea water injector. When the urea water injector overheats, refrigerant is supplied to the radiator through the cooling water pump, and heat is exchanged by the outside air passing through the radiator. This may be a radiator provided separately instead of a radiator for engine cooling.
도 3은 라디에이터를 활용해 열교환하는 방법에 대한 플로챠트이다. 차량의 운행 중 차량 운행 중 디젤배기유체(DEF)를 기동함으로서 냉각수 펌프의 작동은 온 또는 오프되고, 요소수 인젝션이 준비된 상태이다(S10). 3 is a flow chart of a method for exchanging heat using a radiator. While the vehicle is running, by starting the diesel exhaust fluid (DEF) while the vehicle is running, the cooling water pump is turned on or off, and urea water injection is prepared (S10).
배기후처리장치에서 측정된 배기온을 제1설정온도와 비교하고(S20), 배기온이 제1 설정온도 이하이면 냉각수 펌프의 작동을 정지한다(S30). The exhaust temperature measured by the exhaust aftertreatment device is compared with a first set temperature (S20), and when the exhaust temperature is equal to or less than the first set temperature, the operation of the cooling water pump is stopped (S30).
배기온이 제2 설정온도보다 높아지면(S40), 요소수 인젝터가 가열되었다고 보고 냉각수 펌프의 작동을 온한다(S60). 이때 요소수 인젝터는 작동 오프할 수 있다.When the exhaust temperature is higher than the second set temperature (S40), it is determined that the urea water injector is heated and the coolant pump is turned on (S60). At this time, the urea solution injector may be turned off.
배기온이 제1 설정온도보다 크고 제2 설정온도 이하이면, 요소수 인젝터는 과열되지 않은 상태이므로 요소수 인젝터의 작동을 온해서 요소수 인젝션을 한다(S50). 즉, 배기온이 제2 설정온도보다 높거나, 라디에이터 온도가 제2 설정온도보다 높으면 요소수 인젝터는 오프라고 냉각수 펌프 구동을 통해 라디에이터에서 냉매 온도를 낮추는 것이 필요하다.When the exhaust temperature is greater than the first set temperature and less than or equal to the second set temperature, the urea water injector is not overheated, so the urea water injector is turned on to perform urea water injection (S50). That is, when the exhaust temperature is higher than the second set temperature or the radiator temperature is higher than the second set temperature, the urea water injector is turned off and the coolant pump is driven to lower the refrigerant temperature in the radiator.
한편, 냉각수 펌프가 정지하거나 작동 온하거나 엔진 키오프가 아니면 다시 요소수 인젝션이 준비된 상태를 유지한다(S70). Meanwhile, if the coolant pump is stopped, turned on, or the engine is not keyed off, urea water injection is prepared again (S70).
한편, 배기온이 제1 설정온도보다 크고 제2 설정온도 이하라고 해도, 라디에이터 온도가 여전히 제2 설정온도보다 높다면, 우레아 인젝터의 과열이 해소되지 않은 터라, 인젝터 작동을 오프하고, 냉각수 펌프를 가동해야한다(S60).Meanwhile, even if the exhaust temperature is greater than the first set temperature and less than or equal to the second set temperature, if the radiator temperature is still higher than the second set temperature, the overheating of the urea injector has not been resolved, so the injector operation is turned off and the coolant pump is turned off. It should be operated (S60).
라디에이터에 의한 냉매 열교환은 공냉에 해당하므로, 주행속도 등에 따라 열교환 효과가 낮을 수 있기 때문이다. 따라서, 라디에이터의 위치도 중요한데 엔진용 라디에이터와 별도의 라디에이터를 구비해서 차량 측면에 설치될 수 있다.This is because the refrigerant heat exchange by the radiator corresponds to air cooling, and thus the heat exchange effect may be low depending on the running speed. Therefore, the position of the radiator is also important, and it can be installed on the side of the vehicle by providing a radiator for the engine and a separate radiator.
Claims (7)
요소수를 배기후처리장치에 분사하는 요소수 인젝터;
상기 요소수 인젝터와 열교환되는 냉매를 순환시키는 냉각수 펌프;
상기 냉각수 펌프에 의해 라디에이터로 유입된 냉매는 상기 라디에이터를 통과하는 차량의 외부공기에 의해 냉각되는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템In the urea water injector cooling system,
a urea solution injector for injecting urea solution into the exhaust aftertreatment device;
a cooling water pump circulating a refrigerant that exchanges heat with the urea water injector;
Characterized in that the refrigerant introduced into the radiator by the coolant pump is cooled by the outside air of the vehicle passing through the radiator
Urea water injector cooling system that exchanges heat with the radiator
차량의 배기 후처리장치로 요소수 분사모드 작동단계;
배기온이 기 설정된 제1 설정온도보다 높고, 제2 설정온도보다 낮으면 요소수 인젝터를 작동하며,
상기 배기온이 상기 제2 설정온도보다 높으면 상기 요소수 인젝터와 열교환되는 냉매를 순환시키는 냉각수 펌프 작동 온하는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법In the refrigerant control method of the urea water injector cooling system,
Operating a urea water injection mode as an exhaust aftertreatment device of a vehicle;
When the exhaust temperature is higher than the first set temperature and lower than the second set temperature, the urea water injector is operated;
Characterized in that when the exhaust temperature is higher than the second set temperature, the cooling water pump circulating the refrigerant that exchanges heat with the urea water injector is turned on
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
상기 냉각수 펌프 작동 온 시, 냉매는 상기 냉각수 펌프에 의해 라디에이터로 유입되어 상기 라디에이터를 통과하는 외부공기와 열교환 되는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법According to claim 2,
When the cooling water pump is turned on, the refrigerant flows into the radiator by the cooling water pump and exchanges heat with external air passing through the radiator.
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
상기 라디에이터의 냉매 온도가 상기 제2 설정온도보다 높으면, 상기 요소수 인젝터 작동을 오프하고, 상기 냉각수 펌프를 작동을 온하는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법According to claim 3,
When the refrigerant temperature of the radiator is higher than the second set temperature, the urea water injector operation is turned off and the cooling water pump is turned on.
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
상기 라디에이터의 냉매 온도가 상기 제2 설정온도보다 낮으면,
상기 요소수 인젝터를 작동 온 시, 상기 냉각수 펌프를 작동을 오프하는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법According to claim 4,
When the refrigerant temperature of the radiator is lower than the second set temperature,
Characterized in that when the urea water injector is turned on, the coolant pump is turned off
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
상기 제1 설정온도 < 제2 설정온도인 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법According to claim 5,
The first set temperature < the second set temperature, characterized in that
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
시동 오프 전까지는 상기 요소수 분사모드 작동단계가 계속되는 것을 특징으로 하는
라디에이터와 열교환하는 요소수 인젝터 냉각 시스템의 냉매제어방법
According to claim 4 or 5,
Characterized in that the urea injection mode operation step continues until the ignition is turned off
Refrigerant control method of urea water injector cooling system that exchanges heat with radiator
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