US20120118251A1 - Hydraulic variable valve lift apparatus - Google Patents

Hydraulic variable valve lift apparatus Download PDF

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Publication number
US20120118251A1
US20120118251A1 US13/181,100 US201113181100A US2012118251A1 US 20120118251 A1 US20120118251 A1 US 20120118251A1 US 201113181100 A US201113181100 A US 201113181100A US 2012118251 A1 US2012118251 A1 US 2012118251A1
Authority
US
United States
Prior art keywords
oil
piston
oil passage
piston chamber
valve
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/181,100
Other languages
English (en)
Inventor
Byong Young Choi
Young Hong Kwak
Gee Wook Shin
Jin Kook Kong
Soo Hyung Woo
Jin Soon Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Original Assignee
Hyundai Motor Co
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 Hyundai Motor Co filed Critical Hyundai Motor Co
Assigned to HYUNDAI MOTOR COMPANY reassignment HYUNDAI MOTOR COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHOI, BYONG YOUNG, KIM, JIN SOON, KONG, JIN KOOK, KWAK, YOUNG HONG, SHIN, GEE WOOK, WOO, SOO HYUNG
Publication of US20120118251A1 publication Critical patent/US20120118251A1/en
Abandoned legal-status Critical Current

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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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • 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
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic
    • F01L9/11—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column
    • F01L9/12—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem
    • F01L9/14—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic in which the action of a cam is being transmitted to a valve by a liquid column with a liquid chamber between a piston actuated by a cam and a piston acting on a valve stem the volume of the chamber being variable, e.g. for varying the lift or the timing of a valve

Definitions

  • the present invention relates to a valve lift apparatus. More particularly, the present invention relates to a hydraulic pressure variable valve lift apparatus that varies lift mount of a valve for opening/closing a port of an internal combustion engine.
  • An internal combustion engine takes fuel/air into a combustion chamber and combusts them to generate power.
  • An intake valve is opened by a cam shaft to suck in the air and the air is supplied into the combustion chamber while the intake valve is opened.
  • an exhaust valve is lifted by a camshaft and the combustion gas is exhausted from the combustion chamber while the exhaust valve is opened.
  • VVL variable valve lift
  • a CVVL that is broadly used includes a link, an eccentric cam, a control shaft, and so on and the number of components is large, the inertial weight and the accumulated tolerance become larger and there is a drawback in developing moving characteristics of the CVVL system.
  • valve of the cylinder is simultaneously controlled by the same camshaft, the free valve movement is restricted.
  • a hydraulic pressure variable valve lift apparatus may include a housing that a piston chamber that one side thereof is opened is formed, a valve operating piston that is slidably disposed in the piston chamber and one end thereof is connected to a valve for opening/closing a port, and an EHV hydraulic pump that is configured to supply the piston chamber with oil, wherein a first oil passage is formed between the EHV hydraulic pump and the piston chamber so as to supply a side surface of the piston chamber with oil, and an orifice hole is formed from a piston side surface of the valve operating piston to a piston upper end surface.
  • One side of the first oil passage may be connected to a hydraulic pressure line and a first check valve is disposed at the main oil passage so as to prevent the oil from being flown backward.
  • a second oil passage that is diverged from the first oil passage and may be connected to the piston chamber is formed and a second check valve is disposed at the second oil passage so as to prevent the oil from being flown backward.
  • the second oil passage may be connected to a chamber upper end surface of the piston chamber.
  • the second oil passage may be connected to the other side of the piston chamber corresponding to the first oil passage.
  • the first oil passage may be connected to a side surface of the piston chamber with at least L 1 from a chamber upper end surface of the piston chamber
  • the second oil passage is connected to a side surface of the piston chamber with at least L 2 from a chamber upper end surface of the piston chamber, and the length of the L 1 is longer than that of the L 2 .
  • the second check valve may include a check ball for preventing back flowing and a check valve orifice is formed in the check ball such that small amount of oil flows backward or forward.
  • An orifice check valve may be disposed at the orifice hole such that the oil flux that is supplied to the piston chamber through the orifice hole is limited and the supplied oil is prevented from being flown backward.
  • the orifice check valve may include a check ball for preventing back flowing and a check valve orifice is formed in the check ball such that small amount of oil flows backwards or forward.
  • the first oil passage may be connected to a hydraulic pressure release line, includes an oil control valve is disposed at the hydraulic pressure release line so as to open/close the hydraulic pressure release line, and an accumulator that is disposed at a downstream side of the oil control valve in the hydraulic pressure release line and temporally stores the hydraulic pressure that is released.
  • the accumulator may include an accumulator piston that is slidably disposed in the accumulator chamber that is formed in one side of the hydraulic pressure release line and an accumulator spring that elastically supports the accumulator piston.
  • a hydraulic pressure variable valve lift apparatus according to various aspects of the present invention have the valve lift amount be varied according to the operating condition of the engine.
  • a hydraulic pressure variable valve lift apparatus reduces an impact at a moment when the valve is closed by having a valve lift formed a ramp profile.
  • a hydraulic pressure variable valve lift apparatus does not require accurate process of multi orifice and thereby decreases a production cost.
  • FIG. 1 is a cross-sectional view of an exemplary hydraulic pressure variable valve lift apparatus according to the present invention.
  • FIG. 2A to FIG. 2E are showing operating conditions of an exemplary hydraulic pressure variable valve lift apparatus according to the present invention.
  • FIG. 3 is a partial cross-sectional view of an exemplary hydraulic pressure variable valve lift apparatus according to the present invention.
  • FIG. 4 is a partial cross-sectional view of another exemplary hydraulic pressure variable valve lift apparatus according to the present invention.
  • FIG. 5 is a partial cross-sectional view of another exemplary hydraulic pressure variable valve lift apparatus according to the present invention.
  • a hydraulic pressure variable valve lift apparatus includes housing.
  • a piston chamber 135 which is opened in a lower side, is formed, in the housing 120 , a valve operating piston 130 is disposed in the piston chamber 135 , a hydraulic pressure gap adjuster 110 (e.g., HLA: hydraulic lash adjuster) is disposed at a lower side of the valve operating piston 130 , and the hydraulic pressure gap adjuster 110 is connected to a valve 100 .
  • HLA hydraulic lash adjuster
  • the valve 100 moves up and down together with the hydraulic pressure gap adjuster 110 and the valve operating piston 130 .
  • An EHV hydraulic pump 155 is prepared on the housing 120 and the EHV hydraulic pump 155 includes an EHV piston 155 A and a camshaft 155 b.
  • the EHV is an abbreviation of Electro Hydraulic Valve.
  • a pump chamber 158 is formed in the housing, which is spaced apart from the piston chamber 135 to be opened to a side of the housing, the EHV piston 155 A is inserted into the pump chamber 158 , and the camshaft 155 b is disposed corresponding to an outside end portion of the EHV piston 155 A.
  • a return spring 157 returns the EHV piston 155 A that is inserted into the pump chamber 158 in a central direction of the camshaft 155 b.
  • the camshaft 155 b rotates, the cam have the EVH piston 155 A be inserted into the pump chamber 158 and oil pressure of the pump chamber is increased.
  • the first oil passage 160 connects the pump chamber 158 with the piston chamber 135 . Particularly, the first oil passage 160 is connected to a side surface corresponding to a piston side surface 196 of the valve operating piston 130 .
  • An orifice hole 125 which connects the piston side surface 196 with the piston upper end surface 194 is formed in an incline in the valve operating piston 130 . In this condition, oil is charged between a piston upper end surface 194 of the valve operating piston 130 and a chamber upper end surface 192 the piston chamber 135 through the orifice hole 125 .
  • the orifice hole 125 is connected to the first oil passage 160 .
  • a main oil passage 140 is formed in the housing 120 and the main oil passage 140 joins a middle portion of the first oil passage 160 .
  • a first check valve 150 is disposed in the middle of the main oil passage 140 and the first check valve 150 prevents the oil of the first oil passage from being flown backward through the main oil passage 140 .
  • the main oil passage 140 is connected to other oil line and supplements the first oil passage 160 with oil through the first check valve 150 .
  • a HLA oil passage 145 is diverged from the main oil line 140 downstream side of the first check valve 150 and supplies the hydraulic pressure gap adjuster 110 with oil.
  • a hydraulic pressure release line 199 is connected to the first oil passage 160 and an oil control valve 170 and an accumulator 180 are sequentially disposed on the hydraulic pressure release line 199 .
  • the accumulator 180 includes an accumulator piston 184 that is disposed in an accumulator chamber 182 and an accumulator spring 186 that elastically supports the accumulator piston 184 .
  • the accumulator piston 184 moves left side that the accumulator chamber 182 is disposed by the hydraulic pressure and the accumulator spring 186 is compressed absorbing the hydraulic pressure.
  • the first check valve 150 has the oil flown in one direction and sustains the flux at less than a predetermined value.
  • valve operating piston 130 the hydraulic pressure gap adjuster 110 , and the valve 100 start to move downward.
  • the piston chamber 135 slowly moves in the early stage of the process.
  • the oil amount that is supplied to the piston chamber is increased such that the valve operating piston 130 can quickly move.
  • valve 100 is slowly opened at an early stage of the lift period and the valve 100 is quickly opened at a middle stage of the lift.
  • valve 100 is slowly closed to reduce noise and vibration and mechanical friction and abrasion.
  • FIG. 2A shows a early stage of an opening period of the valve 100 , wherein oil is supplied to the first oil passage 160 and oil is supplied to the piston chamber 135 through the orifice hole 125 .
  • the valve 100 is slowly opened forming a ramp.
  • FIG. 2B shows a middle stage of the opening period of the valve 100 , wherein oil is supplied to the first oil passage 160 and the oil of the first oil passage 160 is direct supplied to the piston chamber 135 , compared to the early stage that the oil is supplied through the orifice hole 125 .
  • valve operating piston 130 closes a part of the first oil passage 160 .
  • the first oil passage is connected to a side surface of the piston chamber 135 , wherein the first oil passage 160 is connected to a point that has a L 1 distance from the chamber upper end surface 192 .
  • FIG. 2C shows a high lift stage of the valve 100 , wherein the oil is supplied to the first oil passage 160 and the oil of the first oil passage 160 is direct supplied to the piston chamber 135 , compared with the early stage that the oil is supplied through the second check valve 185 and the orifice hole 125 .
  • FIG. 2D shows a closing stage of the valve 100 , as the oil control valve 170 is being opened, hydraulic pressure is released through the hydraulic pressure release line 199 .
  • the oil starts to be released from the piston chamber 135 to the first oil passage 160 .
  • FIG. 2E shows a closing lamp stage of the valve, the hydraulic pressure of the oil is released through the orifice hole.
  • valve operating piston 130 closes the first oil passage 160 and the oil is only returned through the orifice hole 125 , the amount that is returned from the piston chamber 135 through the first oil passage 160 is decreased. Accordingly, the valve 100 forms a lamp to be slowly closed.
  • the first oil passage 160 is connected to one side surface of the piston chamber 135 and the second oil passage 300 is diverged from the first oil passage 160 to be connected to the other side surface of the piston chamber 135 .
  • the first oil passage 160 is connected to a point that has a L 1 distance from the chamber upper end surface 192 in the side surface of the piston chamber 135 and the second oil passage 300 is connected to a point that has a L 2 distance from the chamber upper end surface 192 in the other side surface of the piston chamber 135 .
  • the length of L 1 is longer than that of L 2 .
  • valve operating piston 130 is positioned at an upper side, small amount of oil is supplied to the piston chamber 135 through the orifice hole 125 , next middle amount of oil is supplied through the second oil passage 300 , and finally large amount of oil is supplied through the first oil passage 160 and the second oil passage 300 .
  • FIG. 4 illustrates a partial cross-section of a hydraulic pressure variable valve lift apparatus similar to that described above, the differences of the illustrated apparatus are described and the overlapping descriptions are omitted.
  • valve operating piston 130 is disposed to move up and down in the piston chamber 135 and the first oil passage 160 is connected to a side surface of the piston chamber 135 .
  • An orifice hole 410 is formed from a side surface of the valve operating piston 130 to the piston upper end surface 194 and an orifice check valve 400 is disposed on the orifice hole 420 .
  • the orifice check valve 400 restricts the flux of the oil that is supplied to the piston chamber 135 from the first oil passage through the orifice hole 420 and prevents the oil of the piston chamber 135 from being flown backward the first oil passage 160 .
  • a ball of the orifice check valve 400 is opened in a forward direction and oil is supplied to the piston chamber 135 through the first oil passage 160 and the orifice hole 420 such that the valve operating piston 130 moves downward.
  • a ball of the orifice check valve 400 is closed in a reverse direction and oil of the piston chamber 135 is exhausted to the first oil passage 160 through a ball orifice 410 that is formed in the ball of the orifice check valve 400 such that the valve operating piston 130 slowly moves upward.
  • FIG. 5 illustrates a partial cross-section of a hydraulic pressure variable valve lift apparatus similar to that described above, the differences of the illustrated apparatus are described and the overlapping descriptions are omitted.
  • valve operating piston 130 is disposed in the piston chamber 135 of the housing 120 to move up and down, the first oil passage 160 is connected to a side surface of the piston chamber 135 , and the second oil passage 500 is diverged from the first oil passage 160 to be connected to an upper end surface of the piston chamber 135 .
  • the second check valve 510 is disposed on the second oil passage 500 to prevent the oil of the piston chamber 135 from being flown backward the first oil passage 160 . In this case, the check valve 510 does not completely cut off the reverse direction flow.
  • a ball of the second check valve 510 is opened in a forward direction and oil starts to be supplied to the piston chamber 135 through the second oil passage 500 such that the valve operating piston 130 starts to move downward.
  • a ball of the second check valve 510 is closed in a reverse direction and oil of the piston chamber 135 is exhausted to the first oil passage 160 through a ball orifice 520 that is formed in the ball of the second check valve 510 such that the valve operating piston 130 slowly moves upward.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
US13/181,100 2010-11-11 2011-07-12 Hydraulic variable valve lift apparatus Abandoned US20120118251A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2010-0112299 2010-11-11
KR1020100112299A KR101154412B1 (ko) 2010-11-11 2010-11-11 유압 가변 밸브 리프트 장치

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US20120118251A1 true US20120118251A1 (en) 2012-05-17

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US13/181,100 Abandoned US20120118251A1 (en) 2010-11-11 2011-07-12 Hydraulic variable valve lift apparatus

Country Status (4)

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US (1) US20120118251A1 (zh)
KR (1) KR101154412B1 (zh)
CN (1) CN102465729B (zh)
DE (1) DE102011051982B4 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9217339B2 (en) 2014-04-24 2015-12-22 Ford Global Technologies, Llc Hydraulic rolling cylinder deactivation systems and methods
WO2016037093A1 (en) * 2014-09-04 2016-03-10 Jacobs Vehicle Systems, Inc. System comprising a pumping assembly operatively connected to a valve actuation motion source or valve train component
CN105673122A (zh) * 2016-03-22 2016-06-15 奇瑞汽车股份有限公司 一种可变气门升程机构油路结构
US11473459B2 (en) 2020-07-07 2022-10-18 Ford Global Technologies, Llc Systems and methods for providing compression release with continuous variable valve lift

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101316880B1 (ko) * 2012-08-08 2013-10-10 현대자동차주식회사 전기-유압 가변 밸브 장치
DE102013220555B4 (de) * 2013-10-11 2015-05-13 Schaeffler Technologies AG & Co. KG Hydraulische Ventilsteuerung einer Brennkraftmaschine
KR101484243B1 (ko) * 2013-12-17 2015-01-19 현대자동차 주식회사 가변 밸브 리프트 장치
US9790819B2 (en) 2014-11-14 2017-10-17 Hyundai Motor Company Variable valve lift system
DE102016204329B4 (de) * 2015-07-02 2020-10-08 Schaeffler Technologies AG & Co. KG Hydraulischer Ventiltrieb für eine Brennkraftmaschine
KR102371063B1 (ko) * 2017-11-20 2022-03-07 현대자동차주식회사 가변밸브기구 제어 시스템 및 그것을 구성하는 오일 컨트롤 밸브

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963006A (en) * 1974-09-03 1976-06-15 Joseph Carl Firey Oil flow positive valve drive mechanism for gasoline engines
US4502425A (en) * 1981-01-20 1985-03-05 Marlene A. Wride Variable lift cam follower
US4724801A (en) * 1987-01-15 1988-02-16 Olin Corporation Hydraulic valve-operating system for internal combustion engines
US4930464A (en) * 1988-10-28 1990-06-05 Daimler-Benz Ag Hydraulically operating actuating device for a lift valve
US5248123A (en) * 1991-12-11 1993-09-28 North American Philips Corporation Pilot operated hydraulic valve actuator
US5460131A (en) * 1994-09-28 1995-10-24 Diesel Engine Retarders, Inc. Compact combined lash adjuster and reset mechanism for compression release engine brakes
US6267098B1 (en) * 1997-11-24 2001-07-31 Diesel Engine Retarders, Inc. Valve operating system having full authority lost motion
US6591795B2 (en) * 1999-09-17 2003-07-15 Diesel Engine Retarders, Inc. Captive volume accumulator for a lost motion system
US6988471B2 (en) * 2003-12-23 2006-01-24 Caterpillar Inc Engine valve actuation system
US7228826B2 (en) * 2003-12-23 2007-06-12 Caterpillar Inc Internal combustion engine valve seating velocity control
US7347172B2 (en) * 2005-05-10 2008-03-25 International Engine Intellectual Property Company, Llc Hydraulic valve actuation system with valve lash adjustment
US7404382B2 (en) * 2003-11-27 2008-07-29 Ningbo Hoyea Machinery Manufacture Co., Ltd. Variable engine valve control system with pressure difference
US20090032762A1 (en) * 2007-08-03 2009-02-05 Mogas Industries, Inc. Flow Control Ball Valve

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3939066A1 (de) * 1989-11-25 1991-05-29 Bosch Gmbh Robert Elektrohydraulische ventilsteuervorrichtung fuer brennkraftmaschinen
KR970004454Y1 (ko) * 1992-12-23 1997-05-09 전성원 엔진 흡배기 밸브의 유압식 개폐장치
JPH08177418A (ja) * 1994-12-22 1996-07-09 Nissan Motor Co Ltd 内燃機関の動弁装置
KR100534833B1 (ko) * 2004-03-26 2005-12-08 현대자동차주식회사 자동차 엔진의 가변 밸브 리프트 장치
KR20100112299A (ko) 2009-04-09 2010-10-19 김동주 제지 슬러지의 재활용 방법

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963006A (en) * 1974-09-03 1976-06-15 Joseph Carl Firey Oil flow positive valve drive mechanism for gasoline engines
US4502425A (en) * 1981-01-20 1985-03-05 Marlene A. Wride Variable lift cam follower
US4724801A (en) * 1987-01-15 1988-02-16 Olin Corporation Hydraulic valve-operating system for internal combustion engines
US4930464A (en) * 1988-10-28 1990-06-05 Daimler-Benz Ag Hydraulically operating actuating device for a lift valve
US5248123A (en) * 1991-12-11 1993-09-28 North American Philips Corporation Pilot operated hydraulic valve actuator
US5460131A (en) * 1994-09-28 1995-10-24 Diesel Engine Retarders, Inc. Compact combined lash adjuster and reset mechanism for compression release engine brakes
US6267098B1 (en) * 1997-11-24 2001-07-31 Diesel Engine Retarders, Inc. Valve operating system having full authority lost motion
US6591795B2 (en) * 1999-09-17 2003-07-15 Diesel Engine Retarders, Inc. Captive volume accumulator for a lost motion system
US7404382B2 (en) * 2003-11-27 2008-07-29 Ningbo Hoyea Machinery Manufacture Co., Ltd. Variable engine valve control system with pressure difference
US6988471B2 (en) * 2003-12-23 2006-01-24 Caterpillar Inc Engine valve actuation system
US7228826B2 (en) * 2003-12-23 2007-06-12 Caterpillar Inc Internal combustion engine valve seating velocity control
US7347172B2 (en) * 2005-05-10 2008-03-25 International Engine Intellectual Property Company, Llc Hydraulic valve actuation system with valve lash adjustment
US20090032762A1 (en) * 2007-08-03 2009-02-05 Mogas Industries, Inc. Flow Control Ball Valve

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9217339B2 (en) 2014-04-24 2015-12-22 Ford Global Technologies, Llc Hydraulic rolling cylinder deactivation systems and methods
WO2016037093A1 (en) * 2014-09-04 2016-03-10 Jacobs Vehicle Systems, Inc. System comprising a pumping assembly operatively connected to a valve actuation motion source or valve train component
US20160069229A1 (en) * 2014-09-04 2016-03-10 Jacobs Vehicle Systems, Inc. System comprising a pumping assembly operatively connected to a valve actuation motion source or valve train component
US10711662B2 (en) * 2014-09-04 2020-07-14 Jacobs Vehicle Systems, Inc. System comprising a pumping assembly operatively connected to a valve actuation motion source or valve train component
CN105673122A (zh) * 2016-03-22 2016-06-15 奇瑞汽车股份有限公司 一种可变气门升程机构油路结构
US11473459B2 (en) 2020-07-07 2022-10-18 Ford Global Technologies, Llc Systems and methods for providing compression release with continuous variable valve lift

Also Published As

Publication number Publication date
DE102011051982B4 (de) 2017-11-09
KR101154412B1 (ko) 2012-06-15
KR20120050842A (ko) 2012-05-21
DE102011051982A1 (de) 2012-05-16
CN102465729B (zh) 2016-05-11
CN102465729A (zh) 2012-05-23

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AS Assignment

Owner name: HYUNDAI MOTOR COMPANY, KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHOI, BYONG YOUNG;KWAK, YOUNG HONG;SHIN, GEE WOOK;AND OTHERS;REEL/FRAME:026579/0682

Effective date: 20110706

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION