KR100515539B1 - intake valve driving apparatus and method for the cycle mode changing engine - Google Patents

intake valve driving apparatus and method for the cycle mode changing engine Download PDF

Info

Publication number
KR100515539B1
KR100515539B1 KR10-2003-0061471A KR20030061471A KR100515539B1 KR 100515539 B1 KR100515539 B1 KR 100515539B1 KR 20030061471 A KR20030061471 A KR 20030061471A KR 100515539 B1 KR100515539 B1 KR 100515539B1
Authority
KR
South Korea
Prior art keywords
valve
engine
stroke
cam
oil
Prior art date
Application number
KR10-2003-0061471A
Other languages
Korean (ko)
Other versions
KR20050023908A (en
Inventor
박성영
한봉훈
이은호
Original Assignee
현대자동차주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 현대자동차주식회사 filed Critical 현대자동차주식회사
Priority to KR10-2003-0061471A priority Critical patent/KR100515539B1/en
Publication of KR20050023908A publication Critical patent/KR20050023908A/en
Application granted granted Critical
Publication of KR100515539B1 publication Critical patent/KR100515539B1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2201/00—Electronic control systems; Apparatus or methods therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)

Abstract

본 발명은 4행정모드와 2행정모드를 변환하는 엔진에서 유압태핏유닛을 이용하여, 비교적 간단하고 용이한 방법으로 흡기밸브의 작동모드를 신뢰성 있게 절환하여 각 행정모드에 적합한 흡기밸브 작동상태를 구현할 수 있도록 한다.According to the present invention, a hydraulic tappet unit is used in an engine for converting a 4-stroke mode and a 2-stroke mode, so that the operation mode of the intake valve can be reliably switched in a relatively simple and easy manner to implement an intake valve operation state suitable for each stroke mode. To help.

Description

행정 전환용 엔진의 흡기밸브 구동장치 및 구동방법{intake valve driving apparatus and method for the cycle mode changing engine}Intake valve driving apparatus and method for driving cycle switching engine

본 발명은 4행정 작동모드와 2행정 작동모드 사이를 가변할 수 있는 엔진에 적용하기 위한 흡기밸브 구동장치 및 그 구동방법에 관한 것이다.The present invention relates to an intake valve driving device and a driving method thereof for applying to an engine that can vary between a four-stroke operation mode and a two-stroke operation mode.

현재 첨단 자동차기술을 가진 업체들은 가솔린기관과 디젤기관의 장점들을 조합하고, 이외에 기존 엔진의 유리한 기술들을 서로 조합하는 연구를 활발히 진행하고 있으며, 그 중 엔진이 4행정으로 작동하기도 하고 2행정으로 작동하기도 하는 행정모드 전환 엔진이 있다.Currently, companies with advanced automobile technology are actively researching the advantages of gasoline and diesel engines and combining the advantageous technologies of existing engines, among which the engine operates in four strokes and two strokes. There is also a stroke mode switching engine.

상기 행정모드 전환 엔진은 기존에 연구되고 있는 거의 모든 신기술을 종합하여 엔진의 연비를 향상시키고 배기가스를 저감하며 출력을 향상시키기 위한 것이다. The stroke mode switching engine is designed to improve the fuel efficiency of the engine, reduce the exhaust gas, and improve the output by integrating almost all new technologies that have been studied.

상기한 바와 같은 행정모드 전환 엔진에서는 4행정모드와 2행정모드에서 서로 다른 흡기밸브의 개폐동작을 구현하여야 한다. 즉, 4행정모드에서 캠샤프트가 1회전할 때 흡기밸브가 1회 개폐되는 것을 기준으로 하면, 2행정모드에서는 캠샤프트가 1회전할 때 흡기밸브가 2회 개폐되어야 한다.In the stroke mode switching engine as described above, the opening and closing operations of the intake valves different from each other in the 4-stroke mode and the 2-stroke mode should be implemented. That is, if the intake valve is opened and closed once when the cam shaft rotates once in the four stroke mode, the intake valve should be opened and closed twice when the cam shaft rotates once in the two stroke mode.

본 발명은 상기한 바와 같이 4행정모드와 2행정모드를 변환하는 엔진에서 비교적 간단하고 용이한 방법으로 흡기밸브의 작동모드를 신뢰성 있게 절환하여 각 행정모드에 적합한 흡기밸브 작동상태를 구현할 수 있도록 한 행정 전환용 엔진의 흡기밸브 구동장치 및 구동방법을 제공함에 그 목적이 있다.The present invention is to achieve the intake valve operating state suitable for each stroke mode by reliably switching the operation mode of the intake valve in a relatively simple and easy way in the engine for switching the four-stroke mode and two-stroke mode as described above. It is an object of the present invention to provide an intake valve driving apparatus and a driving method of an engine for converting strokes.

상기한 바와 같은 목적을 달성하기 위한 본 발명 행정 전환용 엔진의 흡기밸브 구동장치는 밸브스템엔드와 캠의 사이에 설치되어 피스톤과 태핏하우징이 사이에 형성되는 유압실의 용적변화에 의해 캠표면으로부터 밸브까지의 거리가 변화되도록 설치된 유압태핏유닛과;The intake valve driving device of the stroke conversion engine of the present invention for achieving the object as described above is installed between the valve stem end and the cam from the cam surface by the volume change of the hydraulic chamber formed between the piston and the tappet housing. A hydraulic tappet unit installed to change the distance to the valve;

상기 유압태핏유닛에 오일을 공급 및 배출시키는 솔레노이드밸브와;A solenoid valve for supplying and discharging oil to the hydraulic tappet unit;

캠포지션센서의 신호를 받아 상기 솔레노이드밸브를 제어하는 컨트롤러를 포함하여 구성된 것을 특징으로 한다.And a controller configured to control the solenoid valve by receiving a signal from a cam position sensor.

또한 본 발명 행정 전환용 엔진의 흡기밸브 구동방법은 엔진 작동중에 엔진이 2행정모드로 작동하는지 4행정모드로 작동하는지를 판단하는 행정모드판단단계와;In addition, the intake valve driving method of the stroke switching engine of the present invention includes a stroke mode determining step of determining whether the engine operates in a two-stroke mode or a four-stroke mode during engine operation;

엔진이 2행정모드로 작동되면, 캠 노우즈가 밸브로부터 가장 먼 구간을 향해 회전하는 동안 밸브개방시점이 되면 상기 유압태핏유닛에 압유가 공급되도록 솔레노이드밸브를 구동하는 오일공급단계와;An oil supply step of driving the solenoid valve so that the hydraulic oil is supplied to the hydraulic tappet unit at the time of opening the valve while the engine is operated in the two stroke mode, while the cam nose rotates toward the furthest section from the valve;

캠 노우즈가 밸브로부터 가장 먼 구간을 빠져나오는 동안 밸브폐쇄시점이 되면 상기 유압태핏유닛의 압유가 배출되도록 솔레노이드밸브를 구동하는 오일배출단계를 포함하여 구성된 것을 특징으로 한다.It characterized in that it comprises an oil discharge step for driving the solenoid valve so that the pressure oil of the hydraulic tappet unit is discharged when the valve closed time while the cam nose exits the section farthest from the valve.

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

도 1은 본 발명에 따른 행정 전환용 엔진의 흡기밸브 구동장치를 도시한 도면으로서, 밸브스템엔드와 캠(1)의 사이에 설치되어 피스톤(3)과 태핏하우징(5)의 사이에 형성되는 유압실(7)의 용적변화에 의해 캠(1) 표면으로부터 밸브(9)까지의 거리가 변화되도록 설치된 유압태핏유닛(11)과, 상기 유압태핏유닛(11)에 오일을 공급 및 배출시키는 솔레노이드밸브(13)와, 캠포지션센서(15)의 신호를 받아 상기 솔레노이드밸브(9)를 제어하는 컨트롤러를 포함하여 구성된다.1 is a view illustrating an intake valve driving apparatus of a stroke switching engine according to the present invention, which is installed between a valve stem end and a cam 1 and is formed between a piston 3 and a tappet housing 5. The hydraulic tappet unit 11 is installed so that the distance from the surface of the cam 1 to the valve 9 is changed by the volume change of the hydraulic chamber 7, and the solenoid for supplying and discharging oil to the hydraulic tappet unit 11. And a controller for controlling the solenoid valve 9 in response to the valve 13 and the cam position sensor 15.

상기 유압태핏유닛(11)은 본출원인이 이미 출원한 대한민국 특허출원번호 2003-0035594 “엔진의 가변 밸브리프트 장치”의 구성을 거의 그대로 이용하고, 다만, 본 출원에서는 태핏하우징(5)이 항상 캠(1)의 표면에 접촉하여 있는 상태를 가지도록 캠과 유압태핏유닛(11)의 위치관계가 설정되어 있으며, 따라서, 상기 유압실(7)의 용적이 변화하면 피스톤(3)이 하측으로 이동하면서 밸브(9)를 개방시킬 수 있도록 된 점만이 다르다.The hydraulic tappet unit 11 uses the configuration of the Korean Patent Application No. 2003-0035594 "engine variable valve lift device" filed by the present applicant almost as it is, but in the present application, the tappet housing 5 is always cam The positional relationship between the cam and the hydraulic tappet unit 11 is set to have a state in contact with the surface of (1). Therefore, when the volume of the hydraulic chamber 7 changes, the piston 3 moves downward. The only difference is that the valve 9 can be opened.

본 실시예에서 상기 컨트롤러는 캠포지션센서(15)의 신호에 의해 엔진의 2행정 작동시 캠 노우즈(17)가 밸브(9)로부터 가장 먼 구간을 향해 회전하는 동안 상기 솔레노이드밸브(13)를 구동하여, 상기 유압태핏유닛(11)에 오일을 공급한 후, 상기 구간을 빠져 나오는 동안 상기 솔레노이드밸브(13)를 구동하여, 상기 유압태핏유닛(11)의 오일을 배출시키는 엔진ECU(19)로 구성하였다.In this embodiment, the controller drives the solenoid valve 13 while the cam nose 17 rotates toward the furthest section from the valve 9 during the two stroke operation of the engine by the signal of the cam position sensor 15. By supplying oil to the hydraulic tappet unit 11, while driving the solenoid valve 13 while exiting the section, to the engine ECU 19 for discharging the oil of the hydraulic tappet unit 11 Configured.

상기한 바와 같이 구성된 행정 전환용 엔진의 흡기밸브 구동장치의 작동방법을 도 4의 순서도를 참조하여 살펴보면 다음과 같다.The operation method of the intake valve driving apparatus of the stroke switching engine configured as described above will be described with reference to the flowchart of FIG. 4.

엔진ECU(19)는 엔진 작동중에 엔진이 2행정모드로 작동하는지 4행정모드로 작동하는지를 판단하는 행정모드판단단계(S1)를 수행한다.The engine ECU 19 performs the stroke mode determination step S1 for determining whether the engine operates in the two-stroke mode or the four-stroke mode during engine operation.

엔진이 2행정모드로 작동되면, 상기 엔진ECU(19)는 캠 노우즈(17)가 밸브(9)로부터 가장 먼 구간을 향해 회전하는 동안 밸브개방시점이 되면 상기 유압태핏유닛(11)에 압유가 공급되도록 솔레노이드밸브(13)를 구동하는 오일공급단계(S2)를 수행하고, 캠 노우즈(17)가 밸브(9)로부터 가장 먼 구간을 빠져 나오는 동안 밸브폐쇄시점이 되면 상기 유압태핏유닛(11)의 압유가 배출되도록 솔레노이드밸브(13)를 구동하는 오일배출단계(S3)를 수행한다.When the engine is operated in the two-stroke mode, the engine ECU 19 presses the hydraulic pressure on the hydraulic tappet unit 11 at the valve opening point while the cam nose 17 rotates toward the furthest section from the valve 9. Perform the oil supply step (S2) for driving the solenoid valve 13 to be supplied, and the hydraulic tappet unit 11 when the valve closing time while the cam nose 17 exits the section farthest from the valve (9) To perform the oil discharge step (S3) for driving the solenoid valve 13 so that the pressure oil of the.

즉, 캠노우즈(17)가 밸브(9)를 개폐시키는 것이 아니라, 캠노우즈(17)로는 밸브(9)의 개폐가 불가능한 구간에서 상기 유압태핏유닛(11)이 밸브(9)를 개폐시키도록 하는 것이다.That is, the cam nose 17 does not open or close the valve 9, but the hydraulic tappet unit 11 opens or closes the valve 9 in a section in which the cam nose 17 cannot open or close the valve 9. It is.

여기서, 상기 밸브개방시점 및 밸브폐쇄시점은 엔진의 운전상태에 따라서 흡기밸브를 개폐해야 할 시기를 말하는바, 종래의 엔진과 같이 엔진의 다양한 운전조건에 따라 적절히 변동시킬 수 있는 것이다.Here, the valve opening time and the valve closing time refers to the time to open and close the intake valve according to the operating state of the engine, and can be appropriately changed according to various operating conditions of the engine as in the conventional engine.

이렇게 하여 캠노우즈(17)가 밸브(9)를 개폐시키는 것과 상기 유압태핏유닛(11)이 밸브(9)를 개폐시키는 것에 의해 캠노우즈(17)의 1회전에 밸브(9)가 2번 개폐되도록 하여 2행정모드에 필요한 흡기밸브 작동상태를 구현하는 것이다.In this way, the valve 9 opens and closes twice in one rotation of the cam nose 17 by the cam nose 17 opening and closing the valve 9 and the hydraulic tappet unit 11 opening and closing the valve 9. In order to implement the intake valve operating state required for the two-stroke mode.

물론, 엔진ECU(19)가 엔진이 4행정모드로 운전중인 경우에는 상기 유압태핏유닛(11)의 오일이 배출된 상태에서 상기 솔레노이드밸브(13)의 작동을 멈추어서, 캠노우즈(17)가 1회전하는 동안에 1번의 흡기밸브 개폐가 이루어지도록 한다.Of course, when the engine ECU 19 is operating in the four stroke mode, the operation of the solenoid valve 13 is stopped while the oil of the hydraulic tappet unit 11 is discharged, so that the cam nose 17 is stopped. Allow one intake valve to open and close during one revolution.

이와 같은 흡기밸브의 작동에 의해 구현되는 행정 전환용 엔진은 저속에서는 2행정모드로 운전하여 가속성과 추월성을 향상시키고, 고속에서는 4행정모드로 운전하여 연비이득을 구할 수 있게 된다.The stroke switching engine implemented by the operation of the intake valve can be operated in a two-stroke mode at a low speed to improve acceleration and overtaking, and can operate in a four-stroke mode at a high speed to obtain fuel efficiency gains.

이상과 같이 본 발명에 의하면, 4행정모드와 2행정모드를 변환하는 엔진에서 유압태핏유닛을 이용하여, 비교적 간단하고 용이한 방법으로 흡기밸브의 작동모드를 신뢰성 있게 절환하여 각 행정모드에 적합한 흡기밸브 작동상태를 구현할 수 있도록 한다. According to the present invention as described above, by using the hydraulic tappet unit in the engine for switching between the four-stroke mode and the two-stroke mode, the operation mode of the intake valve can be reliably switched in a relatively simple and easy manner, and the intake air is suitable for each stroke mode. Allows the valve to be operated.

도 1은 본 발명에 따른 행정 전환용 엔진의 흡기밸브 구동장치를 도시한 구성도로서 4행정모드로 작동중인 상태를 도시한 도면,1 is a configuration diagram showing an intake valve driving apparatus of an engine for converting strokes according to the present invention.

도 2는 도 1에 대비하여 2행정모드로 작동중인 상태를 도시한 도면,2 is a view showing a state in which the operation in the two-stroke mode compared to FIG.

도 3은 2행정모드와 4행정모드 모두에서 캠 노우즈에 의해 흡기밸브가 개폐되는 상태를 도시한 도면,3 is a view showing a state in which an intake valve is opened and closed by a cam nose in both 2-stroke mode and 4-stroke mode;

도 4은 본 발명에 따른 행정 전환용 엔진의 흡기밸브 구동방법을 설명한 순서도이다.4 is a flowchart illustrating a method of driving an intake valve of an engine for converting strokes according to the present invention.

<도면의 주요 부분에 대한 부호의 간단한 설명><Brief description of symbols for the main parts of the drawings>

1; 캠 3; 피스톤One; Cam 3; piston

5; 태핏하우징 7; 유압실5; Tappet housing 7; Hydraulic chamber

9; 밸브 11; 유압태핏유닛9; Valve 11; Hydraulic Tappet Unit

13; 솔레노이드밸브 15; 캠포지션센서13; Solenoid valve 15; Cam position sensor

17; 캠 노우즈 19; 엔진ECU17; Cam nose 19; Engine ECU

Claims (3)

밸브스템엔드와 캠의 사이에 설치되어 피스톤과 태핏하우징이 사이에 형성되는 유압실의 용적변화에 의해 캠표면으로부터 밸브까지의 거리가 변화되도록 설치된 유압태핏유닛과;A hydraulic tappet unit installed between the valve stem end and the cam, the hydraulic tappet unit being installed to change the distance from the cam surface to the valve by the volume change of the hydraulic chamber in which the piston and the tappet housing are formed; 상기 유압태핏유닛에 오일을 공급 및 배출시키는 솔레노이드밸브와;A solenoid valve for supplying and discharging oil to the hydraulic tappet unit; 캠포지션센서의 신호를 받아 상기 솔레노이드밸브를 제어하는 컨트롤러;A controller for controlling the solenoid valve in response to a signal of a cam position sensor; 를 포함하여 구성된 것을 특징으로 하는 행정 전환용 엔진의 흡기밸브 구동장치.Intake valve driving device for a stroke switching engine, characterized in that configured to include. 제1항에 있어서, 상기 컨트롤러는 The method of claim 1, wherein the controller 캠포지션센서의 신호에 의해 엔진의 2행정 작동시 캠 노우즈가 밸브로부터 가장 먼 구간을 향해 회전하는 동안 상기 솔레노이드밸브를 구동하여, 상기 유압태핏유닛에 오일을 공급한 후, 상기 구간을 빠져나오는 동안 상기 솔레노이드밸브를 구동하여, 상기 유압태핏유닛의 오일을 배출시키는 엔진ECU로 구성된 것During the two-stroke operation of the engine by the signal of the cam position sensor, the solenoid valve is driven while the cam nose rotates toward the farthest section from the valve, while supplying oil to the hydraulic tappet unit, An engine ECU for driving the solenoid valve to discharge oil from the hydraulic tappet unit 을 특징으로 하는 행정 전환용 엔진의 흡기밸브 구동장치.Intake valve driving apparatus of the engine for stroke conversion. 엔진 작동중에 엔진이 2행정모드로 작동하는지 4행정모드로 작동하는지를 판단하는 행정모드판단단계와;A stroke mode determination step of determining whether the engine operates in the two stroke mode or the four stroke mode while the engine is in operation; 엔진이 2행정모드로 작동되면, 캠 노우즈가 밸브로부터 가장 먼 구간을 향해 회전하는 동안 밸브개방시점이 되면 상기 유압태핏유닛에 압유가 공급되도록 솔레노이드밸브를 구동하는 오일공급단계와;An oil supply step of driving the solenoid valve so that the hydraulic oil is supplied to the hydraulic tappet unit at the time of opening the valve while the engine is operated in the two stroke mode, while the cam nose rotates toward the furthest section from the valve; 캠 노우즈가 밸브로부터 가장 먼 구간을 빠져나오는 동안 밸브폐쇄시점이 되면 상기 유압태핏유닛의 압유가 배출되도록 솔레노이드밸브를 구동하는 오일배출단계;An oil discharge step of driving the solenoid valve so that the pressurized oil of the hydraulic tappet unit is discharged when the valve nose is closed while the cam nose exits the section farthest from the valve; 를 포함하여 구성된 것을 특징으로 하는 행정 전환용 엔진의 흡기밸브 구동방법.Intake valve driving method for a stroke switching engine, characterized in that configured to include.
KR10-2003-0061471A 2003-09-03 2003-09-03 intake valve driving apparatus and method for the cycle mode changing engine KR100515539B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR10-2003-0061471A KR100515539B1 (en) 2003-09-03 2003-09-03 intake valve driving apparatus and method for the cycle mode changing engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR10-2003-0061471A KR100515539B1 (en) 2003-09-03 2003-09-03 intake valve driving apparatus and method for the cycle mode changing engine

Publications (2)

Publication Number Publication Date
KR20050023908A KR20050023908A (en) 2005-03-10
KR100515539B1 true KR100515539B1 (en) 2005-09-16

Family

ID=37231358

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-2003-0061471A KR100515539B1 (en) 2003-09-03 2003-09-03 intake valve driving apparatus and method for the cycle mode changing engine

Country Status (1)

Country Link
KR (1) KR100515539B1 (en)

Also Published As

Publication number Publication date
KR20050023908A (en) 2005-03-10

Similar Documents

Publication Publication Date Title
US4615306A (en) Engine valve timing control system
US8118000B2 (en) Multi-stroke internal combustion engine
US7137381B1 (en) Indirect variable valve actuation for an internal combustion engine
EP1472439B1 (en) Engine valve actuator providing miller cycle benefits
JPS61155608A (en) Variable valve timing and lifting device
JP2000170545A (en) Variable cycle internal combustion engine and controller thereof
KR20050059327A (en) A frequency modulated vcr-engine
CA2298986A1 (en) A decompression device of a four-stroke cycle internal combustion engine
US20100059015A1 (en) Multi-stroke internal combustion engine
US7506625B2 (en) Method and apparatus for controlling engine valve timing
KR100515539B1 (en) intake valve driving apparatus and method for the cycle mode changing engine
CN102465768A (en) Engine assembly including independent throttle control for deactivated cylinders
WO2004109077A3 (en) Hcci engine with combustion-tailoring chamber
JP2782311B2 (en) Variable intake valve closing timing device
JP2020186671A (en) Suction/exhaust structure of engine
JPS6118013B2 (en)
JP2782312B2 (en) Variable intake valve closing timing device
CN201496115U (en) Continuous variable gas distribution control system of spark ignition engine
JP2008095672A (en) Valve system for engine
KR960013352B1 (en) Suction &amp; exhaust valve opening controlling apparatus of a car
US7047920B2 (en) Engine valve actuation system and method for controlling white smoke
JPH0364608A (en) Control device for valve timing lift
JPH039026A (en) Intake and exhaust device for internal combustion engine
CN101629498A (en) Continuous and variable gas distribution control system of spark ignition engine
KR20010057637A (en) A hydraulic valve actuating apparatus for internal combustion engines

Legal Events

Date Code Title Description
A201 Request for examination
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20080905

Year of fee payment: 4

LAPS Lapse due to unpaid annual fee