KR100501378B1 - Apparatus for supplying hydroxyl ion to reduce particulate matter - Google Patents

Apparatus for supplying hydroxyl ion to reduce particulate matter Download PDF

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Publication number
KR100501378B1
KR100501378B1 KR10-2002-0073836A KR20020073836A KR100501378B1 KR 100501378 B1 KR100501378 B1 KR 100501378B1 KR 20020073836 A KR20020073836 A KR 20020073836A KR 100501378 B1 KR100501378 B1 KR 100501378B1
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South Korea
Prior art keywords
diesel engine
exhaust pipe
boost pressure
supplying
oxidation catalyst
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KR10-2002-0073836A
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Korean (ko)
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KR20040046034A (en
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김인수
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현대자동차주식회사
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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
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • 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
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/04—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by adding non-fuel substances to combustion air or fuel, e.g. additives
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor

Abstract

본 발명은 매연 저감을 위한 디젤엔진의 수산화이온 공급방법에 관한 것으로, 급가속, 등판시 디젤엔진의 배기관 중간에 설치된 산화촉매의 전단에 수산화이온을 공급하여 일산화질소가 이산화질소로 쉽게 전이되도록 함으로써, 탄소입자의 산화를 촉진하여 매연을 저감시킨다.The present invention relates to a hydroxide ion supply method of a diesel engine for reducing soot, by supplying hydroxide ions to the front end of the oxidation catalyst installed in the middle of the exhaust pipe of the diesel engine during rapid acceleration and climbing, so that nitrogen monoxide is easily transferred to nitrogen dioxide, Promotes oxidation of carbon particles to reduce soot.

Description

매연 저감을 위한 디젤엔진의 수산화이온 공급방법{Apparatus for supplying hydroxyl ion to reduce particulate matter}Apparatus for supplying hydroxyl ion to reduce particulate matter

본 발명은 디젤엔진의 수산화이온 공급방법에 관한 것으로, 좀더 상세하게는 디젤엔진의 배기관 중간에 설치된 산화촉매의 전단에 수산화이온을 공급함으로써 매연을 저감시키는 디젤엔진의 수산화이온 공급방법에 관한 것이다.The present invention relates to a hydroxide ion supply method of a diesel engine, and more particularly, to a hydroxide ion supply method of a diesel engine to reduce the smoke by supplying the hydroxide ion to the front end of the oxidation catalyst installed in the middle of the exhaust pipe of the diesel engine.

일반적으로, 디젤엔진은 가솔린 엔진에 비해 효율이 우수하여 버스, 트럭등 상용차량에 많이 탑재되고 있다.In general, diesel engines are more efficient than gasoline engines and thus are widely installed in commercial vehicles such as buses and trucks.

또한, 최근에는 커먼레일시스템이라는 고압 연료 분사 시스템이 개발되어 채용되고 있는데, 이와 같은 시스템은 기존의 기계식 디젤엔진에 비해 성능은 향상되면서 매연은 상대적으로 감소되어 그 수요가 점점 증가하고 있는 추세이다.In addition, recently, a high-pressure fuel injection system called a common rail system has been developed and adopted. Such a system has improved performance compared to a conventional mechanical diesel engine and smoke is relatively reduced, and its demand is gradually increasing.

그러나, 상기 커먼레일시스템의 채용으로 인해 매연이 줄었다고는 하지만 여전히 디젤엔진에서는 다량의 매연이 발생하고 있어 디젤엔진의 상품화에 악영향을 미치고 있다.However, although the smoke was reduced due to the adoption of the common rail system, a large amount of smoke is still generated in the diesel engine, which adversely affects the commercialization of the diesel engine.

이에, 상기한 매연을 저감하기 위해서 산화촉매를 배기관 중간에 설치하여 매연의 원인물질인 탄소입자를 하기의 화학식1 내지 3의 화학반응을 이용하여 탄소입자와 이산화질소를 반응시켜서 탄소입자를 이산화탄소로 산화시키고 있다.Thus, in order to reduce the soot above, an oxidation catalyst is installed in the middle of the exhaust pipe to oxidize the carbon particles to carbon dioxide by reacting carbon particles with nitrogen dioxide using the chemical reactions of Chemical Formulas 1 to 3 below. I'm making it.

2NO + O2 = 2NO2 2NO + O 2 = 2NO 2

2NO2 + C = CO2 + 2NO 2NO 2 + C = CO 2 + 2NO

NO2 + C = CO + NONO 2 + C = CO + NO

그러나, 상기한 바와 같이 산화촉매를 배기관 중간에 설치한 경우에도, 급가속, 등판시와 같이 터보래그로 인해 다량의 매연이 일시적으로 급격히 증가하는 경우에 탄소입자의 산화가 제대로 이루어지지 못하게 되는 문제점이 있었다. However, even when the oxidation catalyst is installed in the middle of the exhaust pipe as described above, when the large amount of smoke temporarily increases rapidly due to the turbo lag, such as during rapid acceleration and climbing, the oxidation of the carbon particles is not properly performed. There was this.

이에, 본 발명은 상기한 바와 같은 종래의 제 문제점을 해소하기 위해 안출된 것으로, 급가속, 등판시 등과 같이 순간적으로 매연이 증가하는 조건에서 디젤엔진의 배기관 중간에 설치된 산화촉매의 전단에 수산화이온을 공급하여 하기의 화학식4의 화학반응을 이용하여 일산화질소가 이산화질소로 쉽게 전이되도록 함으로써, 탄소 입자의 산화를 촉진하여 매연을 저감시키는 매연 저감을 위한 디젤엔진의 수산화이온 공급방법을 제공하는데 그 목적이 있다.Accordingly, the present invention has been made to solve the problems of the prior art as described above, the hydroxide ion in the front end of the oxidation catalyst installed in the middle of the exhaust pipe of the diesel engine under the conditions that the smoke increases momentarily, such as during rapid acceleration, climbing It is to provide a hydroxide ion supply method of the diesel engine for reducing the smoke to reduce the smoke by promoting the oxidation of the carbon particles by the nitrogen monoxide is easily transferred to nitrogen dioxide by using the chemical reaction of the formula (4) There is this.

NO + OH = NO2 + HNO + OH = NO 2 + H

상기한 바와 같은 목적을 달성하기 위한 본 발명에 따른 매연 저감을 위한 디젤엔진의 수산화이온 공급방법은, 변속단, 터보챠저의 부스트압, 엔진 알피엠 및, 페달각을 감지하는 단계와, 기어가 중립이고 터보챠저의 부스트압이 초기부스트압 보다 작으면 솔레노이드밸브를 소정시간 동안 개방시켜서 봄베에 저장된 수산화이온을 산화촉매 상류의 배기관으로 공급하는 단계와, 기어가 중립이 아니고 엔진알피엠이 소정값 이하인 상태에서 악셀페달 작동 가속도가 소정값 이상이면 소정시간 동안 솔레노이드밸브를 개방시켜서 봄베에 저장된 수산화이온을 산화촉매 상류의 배기관으로 공급하는 단계를 포함하여 구성된 것을 특징으로 한다.Hydroxy ion supply method of the diesel engine for reducing the smoke according to the present invention for achieving the object as described above, the step of detecting the gear stage, the boost pressure of the turbocharger, the engine alpha and the pedal angle, the gear is neutral If the boost pressure of the turbocharger is lower than the initial boost pressure, the solenoid valve is opened for a predetermined time to supply hydroxide ions stored in the cylinder to the exhaust pipe upstream of the oxidation catalyst, and the accelerator pedal is not neutral and the engine APM is less than the predetermined value. If the operation acceleration is more than a predetermined value, characterized in that it comprises the step of opening the solenoid valve for a predetermined time to supply the hydroxide ions stored in the cylinder to the exhaust pipe upstream of the oxidation catalyst.

삭제delete

이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시예를 설명한다.Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

도 1은 본 발명에 따른 디젤엔진의 수산화이온 공급장치의 구성도이고, 도 2는 본 발명에 따른 디젤엔진의 수산화이온 공급 구조를 나타낸 도면이다.1 is a block diagram of a hydroxide ion supply device for a diesel engine according to the present invention, Figure 2 is a view showing a hydroxide ion supply structure of a diesel engine according to the present invention.

상기 도 2에 도시된 바와 같이, 흡입공기는 흡기다기관(10)을 통해 디젤엔진(20)으로 공급되고, 상기 디젤엔진(20)에서 연소된 배기가스는 배기다기관(30)을 통해 배출된다.As shown in FIG. 2, intake air is supplied to the diesel engine 20 through the intake manifold 10, and exhaust gas combusted by the diesel engine 20 is discharged through the exhaust manifold 30.

또한, 상기 배기다기관(30)에서 배출된 배기가스는 배기관(40)을 통해 산화촉매(50)내로 도입되어, 상기 산화촉매(50)에 의해 상기 배기가스내에 포함된 매연이 산화반응하여 감소된 다음 머플러(60)를 통해 외기로 배출된다.In addition, the exhaust gas discharged from the exhaust manifold 30 is introduced into the oxidation catalyst 50 through the exhaust pipe 40 so that the soot contained in the exhaust gas by the oxidation catalyst 50 is oxidized and reduced. The muffler 60 is then discharged to the outside air.

상기 배기관(40)은 T자형으로 분지되어 봄베(70)에 연결되는데, 상기 봄베(70)에는 대략 2∼3기압의 수산화이온이 저장되어 있고, 상기 봄베(70)와 상기 배기관(40)을 연결하는 수산화이온공급관(80)에는 상기 수산화이온을 상기 배기관(40)으로 공급 또는 차단하기 위한 솔레노이드밸브(90)가 장착되어 있다.The exhaust pipe 40 is branched in a T-shape is connected to the cylinder 70, the cylinder 70 is stored in the hydroxide ion of approximately 2 to 3 atm, the cylinder 70 and the exhaust pipe 40 The connecting hydroxide ion supply pipe (80) is equipped with a solenoid valve (90) for supplying or blocking the hydroxide ions to the exhaust pipe (40).

이때, 상기 수산화이온공급관(80)은 배기관(40)내의 배기가스 유동에 영향을 주지 않도록 상기 배기관(40)과 90°∼ 135°의 각도로 배치되도록 한다.At this time, the hydroxide ion supply pipe (80) is arranged at an angle of 90 ° to 135 ° with the exhaust pipe 40 so as not to affect the exhaust gas flow in the exhaust pipe (40).

또한, 상기 솔레노이드밸브(90)는 전자제어유니트(100)에 의해 개폐 제어되는데, 상기 전자제어유니트(100)는 각종센서들(101, 102, 103, 104)에 의해 감지된 변속단, 터보챠저의 부스트압, 엔진 알피엠, 악셀페달각에 따라 상기 솔레노이드밸브(90)를 개폐시키도록 되어 있다.In addition, the solenoid valve 90 is controlled to be opened and closed by the electronic control unit 100, the electronic control unit 100 is a shift stage, the turbo car sensed by the various sensors (101, 102, 103, 104) The solenoid valve 90 is opened and closed according to the low boost pressure, the engine alpha, and the accelerator pedal angle.

상기와 같이 구성된 본 발명에 따른 매연 저감을 위한 디젤엔진의 수산화이온 공급장치 및 방법의 작용 및 효과를 도 3을 참조하여 상세히 설명하면 다음과 같다.The operation and effects of the hydroxide ion supply device and method of the diesel engine for reducing smoke according to the present invention configured as described above will be described in detail with reference to FIG. 3.

도 3은 본 발명에 따른 디젤엔진의 수산화이온 공급방법의 순서도로서, 도 3에서 S는 단계(step)을 의미한다.3 is a flowchart of a hydroxide ion supply method of a diesel engine according to the present invention, in which S denotes a step.

상기 도 3에 도시된 바와 같이, 단계(S1)에서는 각종 센서들(101∼104)가 변속단, 터보챠저의 부스트압, 엔진 알피엠, 악셀페달각을 감지하여 전자제어유니트(60)으로 입력한다.As shown in FIG. 3, in step S1, the various sensors 101 to 104 detect the shift stage, the boost pressure of the turbocharger, the engine ALPM, and the accelerator pedal angle and input the same to the electronic control unit 60.

이어서, 단계(S2)에서 전자제어유니트(100)는 변속단센서(101)에 의해 감지된 변속상태가 중립인지를 판단하여 중립이면 단계(S3)를 수행하고, 중립이 아니면 단계(S7)를 수행한다.Subsequently, in step S2, the electronic control unit 100 determines whether the shift state detected by the shift stage sensor 101 is neutral, and performs step S3 if it is neutral, and performs step S7 if it is not neutral. Perform.

상기 단계(S3)에서 전자제어유니트(60)는 압력센서(102)에 의해 감지된 터보챠저의 부스트압(Bp)이 초기부스트압(Bo) 보다 낮은지를 판단하여 초기부스트압(Bo) 보다 낮으면 단계(S4)를 수행한다. 이때, 상기 초기부스트압(Bo)는 엔진에 따라 차이가 있기는 하지만, 통상 약 730∼760mmHg 정도로 설정하는 것이 바람직하다.In the step S3, the electronic control unit 60 determines whether the boost pressure Bp of the turbocharger sensed by the pressure sensor 102 is lower than the initial boost pressure Bo, and if it is lower than the initial boost pressure Bo, the step ( S4) is performed. At this time, the initial boost pressure (Bo), although there is a difference depending on the engine, it is usually set to about 730 ~ 760mmHg.

상기 단계(S4)에서는 전자제어유니트(100)가 솔레노이드밸브(90)를 개방시킨다. 상기와 같이 솔레노이드밸브(90)가 개방되면, 봄베(70)내의 압력과 배기관(40)내의 압력차에 의해 봄베(70)에 저장된 수산화이온이 배기관(40)으로 공급되어, 배기가스중에 포함된 일산화질소를 이산화질소로 전이시킨다. 그리고, 산화촉매(50)에서는 상기 이산화질소와 배기가스중에 포함된 탄소입자를 반응시켜서 탄소입자를 산화시킴으로써, 매연을 저감시킨다.In step S4, the electronic control unit 100 opens the solenoid valve 90. When the solenoid valve 90 is opened as described above, the hydroxide ions stored in the cylinder 70 are supplied to the exhaust pipe 40 by the pressure difference in the cylinder 70 and the pressure in the exhaust pipe 40, and are included in the exhaust gas. Nitrogen monoxide is transferred to nitrogen dioxide. In the oxidation catalyst 50, soot is reduced by oxidizing the carbon particles by reacting the nitrogen dioxide with the carbon particles contained in the exhaust gas.

이어서, 단계(S5)에서는 터보래그와 산화촉매내의 반응시간을 고려하여 소정시간 바람직하게는 5∼7초 동안 지연시킨 다음 단계(S6)를 수행하고, 상기 단계(S6)에서는 솔레노이드밸브(90)를 폐쇄시킨다.Subsequently, in step S5, a delay for a predetermined time, preferably 5 to 7 seconds, is performed in consideration of the reaction time between the turbo lag and the oxidation catalyst, and then step S6 is performed. In step S6, the solenoid valve 90 is performed. To close.

한편, 단계(S7)에서 전자제어유니트(100)는 엔진알피엠센서(103)에 의해 감지된 엔진알피엠이 소정값 이하인지를 판단하여 소정값 이하이면 단계(S8)을 수행한다.Meanwhile, in step S7, the electronic control unit 100 determines whether the engine RPM detected by the engine RMP sensor 103 is less than or equal to a predetermined value and performs step S8 when it is less than or equal to a predetermined value.

상기 단계(S8)에서 전자제어유니트(100)는 악셀페달센서(104)에 의해 감지된 악셀페달의 작동 가속도가 소정값(바람직하게는 20∼30ms) 이상인지를 판단하여 소정값 이상이면 상기 단계(S4)를 수행하여, 봄베(70)에 저장된 수산화이온을 배기관(40)으로 공급함으로써, 매연을 저감시킨다.In step S8, the electronic control unit 100 determines whether the operation acceleration of the accelerator pedal detected by the accelerator pedal sensor 104 is greater than or equal to a predetermined value (preferably 20 to 30 ms) and is equal to or greater than the predetermined value. By performing (S4), by supplying the hydroxide ions stored in the cylinder 70 to the exhaust pipe 40, soot is reduced.

이상에서 설명한 바와 같이 본 발명에 따르면, 급가속, 등판시 등과 같이 순간적으로 매연이 증가하는 조건에서 디젤엔진의 배기관 중간에 설치된 산화촉매의 전단에 수산화이온을 공급하여 일산화질소가 이산화질소로 쉽게 전이되도록 함으로써, 탄소 입자의 산화를 촉진하여 매연을 저감시키는 효과가 있다.As described above, according to the present invention, nitrogen monoxide is easily transferred to nitrogen dioxide by supplying hydroxide ions to the front end of the oxidation catalyst installed in the middle of the exhaust pipe of a diesel engine under conditions such as rapid acceleration and climbing. By doing so, there is an effect of promoting oxidation of carbon particles to reduce soot.

도 1은 본 발명에 따른 디젤엔진의 수산화이온 공급장치의 구성도,1 is a block diagram of a hydroxide ion supply device of a diesel engine according to the present invention,

도 2는 본 발명에 따른 디젤엔진의 수산화이온 공급 구조를 나타낸 도면,2 is a view showing a hydroxide ion supply structure of a diesel engine according to the present invention,

도 3은 본 발명에 따른 디젤엔진의 수산화이온 공급방법의 순서도이다.3 is a flow chart of a hydroxide ion supply method of a diesel engine according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

20 : 디젤엔진 30 : 배기다기관20: diesel engine 30: exhaust manifold

40 : 배기관 50 : 산화촉매40: exhaust pipe 50: oxidation catalyst

70 : 수산화이온봄베 80 : 수산화이온공급관70: hydroxide ion bomb 80: hydroxide ion supply pipe

90 : 솔레노이드밸브 100 : 전자제어유니트90: solenoid valve 100: electronic control unit

Claims (3)

삭제delete 삭제delete 변속단, 터보챠저의 부스트압, 엔진 알피엠 및, 페달각을 감지하는 단계와, 기어가 중립이고 터보챠저의 부스트압이 초기부스트압 보다 작으면 솔레노이드밸브를 소정시간 동안 개방시켜서 봄베에 저장된 수산화이온을 산화촉매 상류의 배기관으로 공급하는 단계와, 기어가 중립이 아니고 엔진알피엠이 소정값 이하인 상태에서 악셀페달 작동 가속도가 소정값 이상이면 소정시간 동안 솔레노이드밸브를 개방시켜서 봄베에 저장된 수산화이온을 산화촉매 상류의 배기관으로 공급하는 단계를 포함하여 구성된 것을 특징으로 하는 매연 저감을 위한 디젤엔진의 수산화이온 공급방법. Detecting the gearshift stage, boost pressure of the turbocharger, engine ALPM, and pedal angle, and if the gear is neutral and the boost pressure of the turbocharger is lower than the initial boost pressure, the solenoid valve is opened for a predetermined time to oxidize the hydroxide ions stored in the bomb. Supplying to the upstream exhaust pipe, and if the accelerator pedal operation acceleration is higher than the predetermined value when the gear is not neutral and the engine RPM is less than the predetermined value, the solenoid valve is opened for a predetermined time to release the hydroxide ions stored in the bomb exhaust pipe upstream of the oxidation catalyst. Hydroxide supply method for a diesel engine for reducing soot, characterized in that configured to include supplying.
KR10-2002-0073836A 2002-11-26 2002-11-26 Apparatus for supplying hydroxyl ion to reduce particulate matter KR100501378B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05321634A (en) * 1992-05-26 1993-12-07 Mitsubishi Automob Eng Co Ltd Particulate treating device of diesel engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05321634A (en) * 1992-05-26 1993-12-07 Mitsubishi Automob Eng Co Ltd Particulate treating device of diesel engine

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