KR20040015975A - a carbon deposit protecting structure of idle speed control system for LPG vehicle - Google Patents

a carbon deposit protecting structure of idle speed control system for LPG vehicle Download PDF

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Publication number
KR20040015975A
KR20040015975A KR1020020048159A KR20020048159A KR20040015975A KR 20040015975 A KR20040015975 A KR 20040015975A KR 1020020048159 A KR1020020048159 A KR 1020020048159A KR 20020048159 A KR20020048159 A KR 20020048159A KR 20040015975 A KR20040015975 A KR 20040015975A
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South Korea
Prior art keywords
idle speed
speed control
control system
outlet
fuel
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KR1020020048159A
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Korean (ko)
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김영남
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현대자동차주식회사
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Priority to KR1020020048159A priority Critical patent/KR20040015975A/en
Publication of KR20040015975A publication Critical patent/KR20040015975A/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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/04—Gas-air mixing 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

PURPOSE: A carbon deposit prevention structure is provided to prevent carbons from being deposited to the inner wall of the fuel-air mixture flow channel. CONSTITUTION: A fuel-air mixture flow channel(20) which interconnects both sides of the throttle valve is formed at the throttle body. A rotary valve operating by the idle speed actuator is mounted at the intermediate portion of the fuel-air mixture flow channel. The fuel-air mixture flow channel has an inlet(20a) and an outlet(20b) having an area ratio of 1.5 to 20. A surge preventing plate(22) having a plurality of holes(22a) is arranged at the end of the outlet of the fuel-air mixture flow channel.

Description

엘피지 차량 아이들 스피드 콘트롤 시스템의 카본 부착 방지구조{a carbon deposit protecting structure of idle speed control system for LPG vehicle}Carbon deposit protecting structure of idle speed control system for LPG vehicle

본 발명은 엘피지 차량의 아이들 스피드 콘트롤 시스템에 관한 것으로, 특히 혼합기 이동통로의 내벽에 카본이 부착되는 것을 방지할 수 있도록 된 엘피지 차량 아이들 스피드 콘트롤 시스템의 카본 부착 방지구조에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle speed control system of an LPI vehicle, and more particularly to an carbon attachment prevention structure of an LPI vehicle idle speed control system that can prevent carbon from adhering to an inner wall of a mixer moving passage.

일반적으로 자동차 엔진의 출력은 운전자가 가속페달을 조작하여 도 1에 도시된 바와 같은 스로틀바디(10)내 스로틀밸브(11)의 개도를 조절함으로써 제어된다.In general, the output of the automobile engine is controlled by the driver manipulating the accelerator pedal to adjust the opening degree of the throttle valve 11 in the throttle body 10 as shown in FIG.

그런데, 엔진의 아이들 상태에서는 상기 스로틀밸브(11)가 거의 닫혀 있기 때문에 아이들 목표 엔진 회전수로 엔진회전수를 조절하기 위해서는 별도의 흡입공기량 제어 시스템이 필요하다.However, since the throttle valve 11 is almost closed in the idle state of the engine, a separate intake air amount control system is required to adjust the engine speed at the idle target engine speed.

이와 같이, 아이들 운전 상태에서 흡입공기량을 제어하는 것이 아이들 스피드 콘트롤 시스템이며, 이는 도시된 바와 같이, 스로틀바디(10)의 상부에 스로틀밸브(11)의 전후부위를 연결하는 이동통로(20)를 형성하고, 이 이동통로(20)의 중간에 아이들 스피드 액츄에이터(Idle Speed Actuator)에 의해 작동되는 로터리 밸브(21)를 설치하여, ECU에 의해 아이들 스피드 액츄에이터를 제어함으로써 상기 로터리 밸브(21)의 개도를 조절하여 아이들 스피드를 조절할 수 있도록 되어 있다.As such, it is the idle speed control system that controls the amount of intake air in the idle operation state, and as shown, the moving passage 20 connecting the front and rear portions of the throttle valve 11 to the upper portion of the throttle body 10. And a rotary valve 21 operated by an idle speed actuator in the middle of the moving passage 20, and controlling the idle speed actuator by an ECU to open the rotary valve 21. You can adjust the idle speed by adjusting the speed.

한편, LPG를 연료로 사용하는 차량의 경우, 상기 스로틀바디(10)의 입구(12)측 부위에 공급홀(13)를 형성하여, 이 공급홀(13)을 통해 LPG를 공급함으로써 LPG가 입구(12)를 통해 유입된 공기와 혼합된 상태에서 스로틀밸브(11)를 거친 후 그 후방의 출구(14)를 통해 연소실 쪽으로 공급되도록 되어 있다.On the other hand, in the case of a vehicle using LPG as a fuel, a supply hole 13 is formed in the inlet 12 side portion of the throttle body 10, and LPG is supplied by supplying the LPG through the supply hole 13. After passing through the throttle valve (11) in the state of mixing with the air introduced through the (12), it is to be supplied to the combustion chamber through the outlet (14) behind it.

따라서, 아이들 스피드 콘트롤시 상기 이동통로(20)에도 공기와 LPG의 혼합기가 흐르게 되며, 이에 따라 사용기간이 오래 경과하면 상기 이동통로(20)의 내벽에 카본 찌꺼기가 퇴적되어 로터리 밸브(21)의 작동을 방해하는 현상이 발생하게 된다.Therefore, a mixture of air and LPG also flows in the moving passage 20 during idle speed control. Accordingly, when a long period of use has elapsed, carbon residues are deposited on the inner wall of the moving passage 20 to allow the rotary valve 21 to move. Interference may occur.

이와 같은 현상은 LPG내 헤비탄화수소의 양을 줄이거나 공기와 함께 유입되는 먼지 등의 불순물의 양을 줄임으로써 개선시킬 수 있으나, 도 2에 표시된 바와 같이, 밸브(21) 하부에 형성되는 유동 정체영역(S)에 카본층이 두텁게 형성되는 것으로 미루어 보아, 상기 정체영역(S)이 형성되지 않도록 이동통로(20)내 혼합기의 유동상태를 개선함으로써도 가능하다.This phenomenon can be improved by reducing the amount of heavy hydrocarbons in the LPG or by reducing the amount of impurities such as dust introduced with the air, but as shown in FIG. 2, the flow stagnant region formed under the valve 21. In view of the thick formation of the carbon layer in (S), it is possible to improve the flow state of the mixer in the moving passage 20 so that the stagnant region S is not formed.

그런데, 종래 아이들 스피드 콘트롤 시스템의 이동통로(20)는 그 유입구(20a)와 배출구(20b)의 면적비가 거의 같기 때문에(A2/A1=1) 유동 흐름의 자유도가 낮아(유동저항이 크다.) 상기 정체영역(S)이 항상 형성되며, 더욱이 상기 배출구(20b)를 통해 스로틀바디(10)의 메인통로(출구(14)측 부분)로부터 유입되는 맥동파는 상기 정체영역(S)의 형성을 더욱 용이하게 하여 카본 퇴적을 가속화시키는 문제점이 있었다.By the way, the moving passage 20 of the idle speed control system of the related art has a low degree of freedom in flow flow because the area ratio of the inlet port 20a and the outlet port 20b is almost the same (A2 / A1 = 1). The stagnant region S is always formed, and moreover, the pulsating wave flowing from the main passage (outlet 14 side portion) of the throttle body 10 through the outlet 20b further forms the stagnant region S. There was a problem of facilitating accelerated carbon deposition.

이에 본 발명은 상기와 같은 문제점을 해결하기 위하여 안출된 것으로, 엘피지 차량의 아이들 스피드 콘트롤 시스템의 이동통로내에 유동의 정체영역이 형성되지 않도록 하여 카본의 고착을 방지함으로써 카본층과 밸브와의 간섭을 방지하여 원활한 아이들 스피드 콘트롤 작용이 이루어질 수 있도록 된 엘피지 차량 아이들스피드 콘트롤 시스템의 카본 부착 방지구조를 제공함에 그 목적이 있다.Accordingly, the present invention has been made to solve the above problems, by preventing the settling region of the flow in the moving passage of the idle speed control system of the LPI vehicle to prevent carbon sticking to prevent interference between the carbon layer and the valve. It is an object of the present invention to provide a carbon attachment preventing structure of the LPI vehicle idle speed control system, which can prevent the smooth idle speed control action.

도 1은 아이들 스피드 콘트롤 시스템이 설치된 엘피지 차량의 스로틀바디 단면도,1 is a cross-sectional view of a throttle body of an LPI vehicle equipped with an idle speed control system;

도 2는 도 1에 도시된 아이들 스피드 콘트롤 시스템의 혼합기 이동통로의 단면도,2 is a cross-sectional view of the mixer movement path of the idle speed control system shown in FIG.

도 3은 본 발명에 따른 카본 부착 방지구조가 적용된 엘피지 차량 아이들 스피드 콘트롤 시스템의 혼합기 이동통로 단면도이다.3 is a cross-sectional view of a mixer movement path of an LPI vehicle idle speed control system to which a carbon attachment prevention structure according to the present invention is applied.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

10 : 스로틀바디,11 : 스로틀밸브,10: throttle body, 11: throttle valve,

12 : 입구,13 : 공급홀,12: entrance, 13: supply hole,

14 : 출구,20 : 이동통로,14: exit, 20: moving passage,

20a : 유입구,20b : 배출구,20a: inlet, 20b: outlet,

21 : 로터리 밸브,22 : 맥동차단판,21: rotary valve, 22: pulsation blocking plate,

22a : 구멍.22a: hole.

상기와 같은 목적을 달성하기 위한 본 발명은, 이동통로의 유입구에 비해 배출구가 크게 형성되고, 이 배출구에 맥동 차단판이 설치되는 구조로 이루어진다.The present invention for achieving the above object, the discharge port is formed larger than the inlet port of the moving passage, it consists of a structure in which the pulsation blocking plate is installed in this outlet.

이하, 본 발명을 첨부된 예시도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 3은 본 발명이 적용된 엘피지 차량 아이들 스피드 콘트롤 시스템의 혼합기 이동통로 단면도로서, 대응도인 도 2에 비해 배출구(20b)와 스로틀바디(10)의 메인통로(출구(14)측 부분)가 연결되는 부위까지 도시하였다.3 is a cross-sectional view of the mixer moving passage of the LPI vehicle idle speed control system to which the present invention is applied, and the main passage (outlet 14 side portion) of the outlet 20b and the throttle body 10 is connected as compared to FIG. As far as the site is shown.

종래와 동일하게, 스로틀밸브(11)가 닫힌 아이들 운전상태에서 LPG 혼합기는 상기 유입구(20a)로 흘러들어와 밸브(21)를 거쳐 배출구(20b)를 통해 빠져나가게 된다.As in the related art, the LPG mixer flows into the inlet 20a and exits through the outlet 20b through the valve 21 in the idle operation state in which the throttle valve 11 is closed.

이에 있어서, 본 발명은 상기 유입구(20a)에 비해 배출구(20b)의 면적을 크게 형성함에 그 특징이 있다.In this case, the present invention is characterized in that to form a larger area of the outlet 20b than the inlet (20a).

그런데, 배출구(20b)의 면적이 소량 증가된 경우는 그 효과가 미미하므로 아이들 스피드 콘트롤 밸브 하우징과 스로틀바디(10)의 살두께를 고려하여 면적비 A2/A1 = 1.5 ~ 2.0 정도로 하는 것이 바람직하다.However, when the area of the outlet 20b is increased a small amount, the effect is insignificant, and it is preferable to set the area ratio A2 / A1 = 1.5 to 2.0 in consideration of the thickness of the idle speed control valve housing and the throttle body 10.

이와 같이 유입구(20a)에 비해 배출구(20b)의 면적을 크게 하면 유동저항이 줄어들어 유동 자유도가 향상되므로 밸브(21) 설치부위에 정체영역(S)이 생성되지 않으므로 카본의 퇴적현상이 방지되게 된다.In this way, if the area of the outlet 20b is increased compared to the inlet 20a, the flow resistance is reduced and the degree of freedom of flow is improved, so that the stagnant region S is not generated at the installation portion of the valve 21, thereby preventing carbon deposition. .

또한, 상기 배출구(20b)의 단부 즉, 스로틀바디(10)의 출구(14)측 이전 부분에 맥동 차단판(22)이 설치되는 것이 본 발명의 또 다른 특징이다.In addition, it is another feature of the present invention that the pulsation blocking plate 22 is installed at an end portion of the outlet 20b, that is, at an exit portion 14 side of the throttle body 10.

상기 맥동 차단판(22)은 배출구(20b)와 스로틀바디(10)의 출구(14) 사이에 형성되는 격벽으로서, 이 맥동 차단판(22)에는 다수의 구멍(22a)이 형성되어 있어서, 배출구(20b)의 LPG혼합기가 빠져나갈 수 있도록 되어 있다.The pulsation blocking plate 22 is a partition wall formed between the outlet 20b and the outlet 14 of the throttle body 10, and the pulsation blocking plate 22 is formed with a plurality of holes 22a. The LPG mixer of 20b can be pulled out.

물론, 상기 맥동 차단판(22)이 설치됨으로써 배출구(20b)의 LPG혼합기 유동저항이 증가될 수 있으나, 유동저항을 최소화하면서도 스로틀바디(10) 출구(14) 측으로부터 전해지는 맥동파의 영향도 최소화 할 수 있는 상기 구멍(22a)들의 총합 면적을 반복실험을 통해서 찾을 수 있다.Of course, since the pulsation blocking plate 22 is installed, the LPG mixer flow resistance of the outlet 20b may be increased, but the influence of the pulsation wave transmitted from the outlet 14 side of the throttle body 10 is minimized while minimizing the flow resistance. The total area of the holes 22a that can be minimized can be found through repeated experiments.

이는 자동차 배기계의 소음기에 있어서, 소음성능 향상과 배기저항 감소를 동시에 추구하는 것과 같이 상호간에 상충되는 성질이 있는 것과 마찬가지로서, 본 발명에서는 상기 맥동차단판(22)을 설치함으로써 스로틀바디(10) 출구(14)측 부위의 맥동파에 의한 영향을 감소시켜 이동통로(20) 내 정체영역(S)이 형성되는 것을 막아, 카본이 퇴적되는 현상을 방지할 수 있게 된다.This is similar to that in the silencer of the automobile exhaust system, there is a mutually conflicting nature, such as pursuing the improvement of noise performance and reduction of exhaust resistance at the same time, in the present invention, by providing the pulsation blocking plate 22 in the throttle body (10) By reducing the influence of the pulsating wave on the portion of the outlet 14 side, it is possible to prevent the stagnant region S in the moving passage 20 from being formed, thereby preventing carbon from being deposited.

이상 설명한 바와 같이 본 발명에 따르면, 유입구에 비해 배출구의 면적을 크게 하여 유동저항을 감소시키고, 또한 배출구의 단부에 맥동차단판을 설치하여 맥동파에 의한 영향을 줄임으로써 아이들 스피드 콘트롤 시스템의 이동통로내 특히 로터리 밸브 설치부위의 내벽에 카본 퇴적층이 형성되는 것을 방지할 수 있게 된다.As described above, according to the present invention, the flow path of the idle speed control system is reduced by increasing the area of the outlet compared to the inlet, thereby reducing the flow resistance, and reducing the influence of the pulsating wave by installing a pulsation blocking plate at the end of the outlet. In particular, the carbon deposition layer can be prevented from being formed on the inner wall of the rotary valve installation portion.

이와 같이 카본 퇴적층이 형성되지 않으면, 밸브의 작동이 카본 퇴적층에 간섭되지 않아 ECU에 의해 아이들 스피드 액츄에이터가 제어 되는대로 밸브가 정상적으로 작동되므로, 설정된대로 흡입공기량 제어작용이 이루어져 공회전 상태의 운전이 안정적으로 이루어지고, 정속 부조현상이 해결되며, 시동성도 향상되는 효과가 있게 된다.If the carbon deposition layer is not formed in this way, the operation of the valve does not interfere with the carbon deposition layer and the valve operates normally as the idle speed actuator is controlled by the ECU. It is possible to reduce the constant speed relief phenomenon and improve the startability.

Claims (2)

스로틀바디(10)에 스로틀밸브(11)의 양측부를 연결하는 혼합기 이동통로(20)가 형성되고, 이 이동통로(20)의 중간에 아이들 스피드 액츄에이터에 의해 작동되는 로터리 밸브(21)가 설치된 구조로 이루어진 엘피지 차량의 아이들 스피드 콘트롤 시스템에 있어서,A mixer movement passage 20 is formed in the throttle body 10 to connect both sides of the throttle valve 11, and a rotary valve 21 operated by an idle speed actuator is installed in the middle of the movement passage 20. In the idle speed control system of the LPI vehicle, 상기 이동통로(20)는 유입구(20a)와 배출구(20b)의 면적비가 A2/A1 = 1.5 ~ 2.0 로 형성된 것을 특징으로 하는 엘피지 차량 아이들 스피드 콘트롤 시스템의 카본 부착 방지구조.The movement passage 20 is the carbon attachment prevention structure of the LPI vehicle idle speed control system, characterized in that the area ratio of the inlet (20a) and the outlet (20b) is formed A2 / A1 = 1.5 ~ 2.0. 제 1항에 있어서, 상기 배출구(20b)의 단부에는 다수의 구멍(22a)이 형성된 맥동방지판(22)이 설치되는 것을 특징으로 하는 엘피지 차량 아이들 스피드 콘트롤 시스템의 카본 부착 방지구조.The structure of claim 1, wherein a pulsation preventing plate (22) having a plurality of holes (22a) is installed at an end portion of the discharge port (20b).
KR1020020048159A 2002-08-14 2002-08-14 a carbon deposit protecting structure of idle speed control system for LPG vehicle KR20040015975A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200458596Y1 (en) * 2011-01-07 2012-02-15 김량희 Smart medical glove system
CN104989533A (en) * 2015-07-13 2015-10-21 江门逸和机电有限公司 Anti-carbon electronic throttle valve
CN113431678A (en) * 2021-05-27 2021-09-24 株式会社三国 Carbon deposition prevention structure of throttle body

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US4979484A (en) * 1987-05-19 1990-12-25 Robert Bosch Gmbh Device for controlling at least one throttle cross-section at least one control orifice
JPH03217651A (en) * 1990-01-20 1991-09-25 Hitachi Ltd Intake air flow rate control device of engine
KR970041271U (en) * 1995-12-19 1997-07-29 Carbon removal device for exhaust gas recirculation valve
JPH09195896A (en) * 1996-01-19 1997-07-29 Toyota Motor Corp Intake device of internal combustion engine
WO1997030285A1 (en) * 1996-02-14 1997-08-21 Philips Electronics N.V. Valve with combined valve members, and fuel-injection system provided with such a valve
JPH10288135A (en) * 1997-04-14 1998-10-27 Nippon Soken Inc Idle air intake control device
KR20010026888A (en) * 1999-09-09 2001-04-06 이계안 Throttle body structure for vehicle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979484A (en) * 1987-05-19 1990-12-25 Robert Bosch Gmbh Device for controlling at least one throttle cross-section at least one control orifice
JPH03217651A (en) * 1990-01-20 1991-09-25 Hitachi Ltd Intake air flow rate control device of engine
KR970041271U (en) * 1995-12-19 1997-07-29 Carbon removal device for exhaust gas recirculation valve
JPH09195896A (en) * 1996-01-19 1997-07-29 Toyota Motor Corp Intake device of internal combustion engine
WO1997030285A1 (en) * 1996-02-14 1997-08-21 Philips Electronics N.V. Valve with combined valve members, and fuel-injection system provided with such a valve
JPH10288135A (en) * 1997-04-14 1998-10-27 Nippon Soken Inc Idle air intake control device
KR20010026888A (en) * 1999-09-09 2001-04-06 이계안 Throttle body structure for vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200458596Y1 (en) * 2011-01-07 2012-02-15 김량희 Smart medical glove system
CN104989533A (en) * 2015-07-13 2015-10-21 江门逸和机电有限公司 Anti-carbon electronic throttle valve
CN113431678A (en) * 2021-05-27 2021-09-24 株式会社三国 Carbon deposition prevention structure of throttle body
CN113431678B (en) * 2021-05-27 2023-03-21 株式会社三国 Carbon deposition prevention structure of throttle body

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