US20110277712A1 - Electrohydraulic valve controller - Google Patents

Electrohydraulic valve controller Download PDF

Info

Publication number
US20110277712A1
US20110277712A1 US13/121,257 US200913121257A US2011277712A1 US 20110277712 A1 US20110277712 A1 US 20110277712A1 US 200913121257 A US200913121257 A US 200913121257A US 2011277712 A1 US2011277712 A1 US 2011277712A1
Authority
US
United States
Prior art keywords
valve
pressure
hydraulic
space
hydraulic 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
US13/121,257
Inventor
Michael Haas
Nicola Morelli
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Assigned to SCHAEFFLER TECHNOLOGIES GMBH & CO. KG reassignment SCHAEFFLER TECHNOLOGIES GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAAS, MICHAEL, MORELLI, NICOLA
Publication of US20110277712A1 publication Critical patent/US20110277712A1/en
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG
Abandoned legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34446—Fluid accumulators for the feeding circuit
    • 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
    • F01L2800/00—Methods of operation using a variable valve timing mechanism
    • F01L2800/12—Fail safe operation

Definitions

  • the invention relates to an electrohydraulic valve controller for the variable actuation of a gas-exchange valve of an internal combustion engine.
  • the valve controller comprises:
  • control line connecting the pressure space to the pressure-relief space and an electrically controllable hydraulic valve that is arranged in this control line and releases or blocks a hydraulic medium flow through the control line
  • bypass line connecting the pressure space to the pressure-relief space and a non-return valve that is arranged in this bypass line and releases a hydraulic medium flow through the bypass line into the pressure space and blocks a hydraulic medium flow into the pressure-relief space.
  • valve control proposed in the cited publication lacks emergency running properties that allow at least a limited further operation of the internal combustion engine.
  • the present invention is therefore based on the objective of refining a valve control of the type named above so that this also has, in the case of incorrect functioning of the hydraulic valve, adequate emergency running properties. Below it is understood that a valve stroke that is adequate for a successful gas-exchange cycle in the internal combustion engine can be generated also in the emergency running mode.
  • the valve control should comprise an additional hydraulic valve that is arranged in the control line between the hydraulic valve and the pressure-relief space and blocks, in the case of an incorrectly open hydraulic valve, the hydraulic medium flow through the control line into the pressure-relief space.
  • the additional hydraulic valve likewise can be controlled electrically and has a non-energized open construction.
  • One essential advantage of this design is the favorable energy balance of the valve control, because the additional hydraulic valve would then be energized only during the emergency running operation. Regardless of this arrangement, the possibility nevertheless also arises to provide the additional hydraulic valve as a non-energized closed construction and/or to select, instead of an electrical control, a hydraulic, pneumatic, or mechanical control.
  • the hydraulic valve should have a construction that switches significantly more quickly than the additional hydraulic valve. Because the normal functionality of the valve control can be eliminated during the time-limited emergency running operation, the additional hydraulic valve can remain permanently closed and consequently can be constructed as an economical valve that switches comparatively more slowly.
  • FIGURE shows a hydraulic switching diagram of an electrohydraulic valve controller according to the invention.
  • an electrohydraulic valve controller 1 for variable actuation of a gas-exchange valve 2 of an internal combustion engine are disclosed with reference to a hydraulic switching diagram. Shown are a master piston 3 that is driven via a lever-like cam follower 4 by a cam 5 of a camshaft 6 and a slave piston 7 that drives, through the use of a valve bridge 8 , a pair of identically acting gas-exchange valves 2 , i.e., intake or exhaust valves, against the force of valve springs 9 acting in the closing direction.
  • the master piston 3 and the slave piston 7 define a hydraulic pressure space 10 that is connected by a control line 11 to a hydraulic pressure-relief space 12 .
  • a hydraulic valve 13 that is arranged in the control line 11 and has an electrically controllable and non-energized open construction according to the drawn switching symbol provides that a hydraulic medium flow through the control line 11 is opened up or blocked and accordingly the pressure space 10 has a variable volume during the actuation of the master piston 3 .
  • the continuous variability of the valve actuation generated in this way extends within the limits of the maximum opening stroke of the gas-exchange valve 2 on one hand, when the hydraulic valve 13 is located in the closed position during the entire stroke phase of the master piston 3 , and complete shutdown of the gas-exchange valve 2 on the other hand, when the hydraulic valve 13 is located in the open position at least up to the maximum height of the master piston 3 .
  • the pressure-relief space 12 connected to a hydraulic medium supply 14 of the internal combustion engine and, in the present case, to its lubricant supply via a non-return valve 15 that has a spring-loaded pressure storage device 16 of known construction and is connected via a bypass line 17 to the pressure space 10 for the purpose of balancing out hydraulic medium losses caused by leakage from the pressure space 10 .
  • a non-return valve 18 arranged in the bypass line 17 has the effect that a hydraulic medium flow through the bypass line 17 is opened up into the pressure space 10 and blocked into the pressure-relief space 12 .
  • the valve controller 1 comprises, according to the invention, an additional hydraulic valve 19 that is arranged in the control line 11 between hydraulic valve 13 and pressure-relief space 12 and is opened during the normal, i.e., error-free operation of the valve controller 1 .
  • the additional hydraulic valve 19 allows emergency running operation of the internal combustion engine.
  • the additional hydraulic valve 19 that likewise has an electrically controllable and non-energized open construction according to its switching symbol. This is based in that the additional hydraulic valve 19 must switch only once at the beginning of the emergency running operation from the open position into the closed position. Accordingly, the additional hydraulic valve 19 could be constructed significantly more economically than the significantly more quickly switching hydraulic valve 13 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

An electrohydraulic valve controller (1) for the variable actuation of a gas exchange valve (2) of an internal combustion engine is provided that includes a hydraulic valve (13), and for the purpose of emergency running properties, an additional hydraulic valve (19).

Description

    BACKGROUND
  • The invention relates to an electrohydraulic valve controller for the variable actuation of a gas-exchange valve of an internal combustion engine. The valve controller comprises:
  • a master piston driven by a camshaft,
  • a slave piston driving the gas-exchange valve,
  • a pressure space defined by the master piston and the slave piston and having variable volume,
  • a pressure-relief space connected to a hydraulic medium supply of the internal combustion engine,
  • a control line connecting the pressure space to the pressure-relief space and an electrically controllable hydraulic valve that is arranged in this control line and releases or blocks a hydraulic medium flow through the control line,
  • a bypass line connecting the pressure space to the pressure-relief space and a non-return valve that is arranged in this bypass line and releases a hydraulic medium flow through the bypass line into the pressure space and blocks a hydraulic medium flow into the pressure-relief space.
  • Such a valve controller emerges from EP 0 931 912 A2 that is considered a class-forming patent. The variability of the control times and the maximum stroke of the gas-exchange valve is achieved in that a sub-volume of the pressure space acting as a so-called hydraulic linkage can be stepped-down continuously into the pressure-relief space for an opened hydraulic valve and accordingly the cam stroke specified by the camshaft is transmitted completely, partially, or not at all to the gas-exchange valve. Consequently, the hydraulic valve whose switching function must be guaranteed in a precise and reproducible way under all operating conditions of the internal combustion engine takes over a significant amount of responsibility for the functional reliability of the valve control.
  • However, because a no longer closing hydraulic valve is accompanied with a closure of the gas-exchange valve or the associated gas-exchange valves and incorrect functioning of the hydraulic valve can never be completely ruled out, the valve control proposed in the cited publication lacks emergency running properties that allow at least a limited further operation of the internal combustion engine.
    • SUMMARY
  • The present invention is therefore based on the objective of refining a valve control of the type named above so that this also has, in the case of incorrect functioning of the hydraulic valve, adequate emergency running properties. Below it is understood that a valve stroke that is adequate for a successful gas-exchange cycle in the internal combustion engine can be generated also in the emergency running mode.
  • The objective is met by the features of the invention, while advantageous refinements and constructions of the invention are described below and in the claims. Consequently, the valve control should comprise an additional hydraulic valve that is arranged in the control line between the hydraulic valve and the pressure-relief space and blocks, in the case of an incorrectly open hydraulic valve, the hydraulic medium flow through the control line into the pressure-relief space. Through these measures, also for a permanently open hydraulic valve—for example, due to an electrical current interruption or a mechanical defect in the hydraulic valve—a pressure buildup adequate for the stroke transfer to the gas-exchange valve is made possible in the pressure space in that the additional hydraulic valve is closed during the emergency running operation and thus prevents a pressure relief of the pressure space.
  • For the case that is preferred in the sense of the invention such that the hydraulic valve has a non-energized open construction, it can be provided that the additional hydraulic valve likewise can be controlled electrically and has a non-energized open construction. One essential advantage of this design is the favorable energy balance of the valve control, because the additional hydraulic valve would then be energized only during the emergency running operation. Regardless of this arrangement, the possibility nevertheless also arises to provide the additional hydraulic valve as a non-energized closed construction and/or to select, instead of an electrical control, a hydraulic, pneumatic, or mechanical control.
  • In addition, the hydraulic valve should have a construction that switches significantly more quickly than the additional hydraulic valve. Because the normal functionality of the valve control can be eliminated during the time-limited emergency running operation, the additional hydraulic valve can remain permanently closed and consequently can be constructed as an economical valve that switches comparatively more slowly.
    • BRIEF DESCRIPTION OF THE DRAWING
  • Additional features of the invention emerge from the following description and from the drawing in which one embodiment of the invention is shown simplified. The sole FIGURE shows a hydraulic switching diagram of an electrohydraulic valve controller according to the invention.
    •  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • In the FIGURE, the essential components of an electrohydraulic valve controller 1 according to the invention for variable actuation of a gas-exchange valve 2 of an internal combustion engine are disclosed with reference to a hydraulic switching diagram. Shown are a master piston 3 that is driven via a lever-like cam follower 4 by a cam 5 of a camshaft 6 and a slave piston 7 that drives, through the use of a valve bridge 8, a pair of identically acting gas-exchange valves 2, i.e., intake or exhaust valves, against the force of valve springs 9 acting in the closing direction. The master piston 3 and the slave piston 7 define a hydraulic pressure space 10 that is connected by a control line 11 to a hydraulic pressure-relief space 12. A hydraulic valve 13 that is arranged in the control line 11 and has an electrically controllable and non-energized open construction according to the drawn switching symbol provides that a hydraulic medium flow through the control line 11 is opened up or blocked and accordingly the pressure space 10 has a variable volume during the actuation of the master piston 3. The continuous variability of the valve actuation generated in this way extends within the limits of the maximum opening stroke of the gas-exchange valve 2 on one hand, when the hydraulic valve 13 is located in the closed position during the entire stroke phase of the master piston 3, and complete shutdown of the gas-exchange valve 2 on the other hand, when the hydraulic valve 13 is located in the open position at least up to the maximum height of the master piston 3.
  • The pressure-relief space 12 connected to a hydraulic medium supply 14 of the internal combustion engine and, in the present case, to its lubricant supply via a non-return valve 15 that has a spring-loaded pressure storage device 16 of known construction and is connected via a bypass line 17 to the pressure space 10 for the purpose of balancing out hydraulic medium losses caused by leakage from the pressure space 10. In this way, a non-return valve 18 arranged in the bypass line 17 has the effect that a hydraulic medium flow through the bypass line 17 is opened up into the pressure space 10 and blocked into the pressure-relief space 12.
  • In case that the hydraulic valve 13 incorrectly remains open during the operation of the internal combustion engine—as mentioned above, a cause for this could be, in particular, an interrupted power supply to the hydraulic valve 13—and this would lead to the complete closure of the gas-exchange valve 2 for a correspondingly unacceptable operating behavior of the internal combustion engine, the valve controller 1 comprises, according to the invention, an additional hydraulic valve 19 that is arranged in the control line 11 between hydraulic valve 13 and pressure-relief space 12 and is opened during the normal, i.e., error-free operation of the valve controller 1. The additional hydraulic valve 19, however, allows emergency running operation of the internal combustion engine. This is initiated in that the additional hydraulic valve 19 closes after detection of the incorrectly open hydraulic valve 13, so that the hydraulic medium pressure building up in the pressure space 10 can no longer be discharged into the pressure-relief space 12 and the gas-exchange valves 2 open sufficiently wide. In the theoretical case of a completely incompressible and leak-tight pressure space 10, the stroke specified by the master piston 3 could be transmitted to the gas-exchange valves 2 and would correspond to the maximum opening stroke mentioned above.
  • Compared with requirements for the hydraulic valve 13, significantly lower requirements can be placed on the switching rate of the additional hydraulic valve 19 that likewise has an electrically controllable and non-energized open construction according to its switching symbol. This is based in that the additional hydraulic valve 19 must switch only once at the beginning of the emergency running operation from the open position into the closed position. Accordingly, the additional hydraulic valve 19 could be constructed significantly more economically than the significantly more quickly switching hydraulic valve 13.
    • REFERENCE SYMBOLS
    • 1 Valve controller
    • 2 Gas-exchange valve
    • 3 Master piston
    • 4 Cam follower
    • 5 Cam
    • 6 Camshaft
    • 7 Slave piston
    • 8 Valve bridge
    • 9 Valve spring
    • 10 Pressure space
    • 11 Control line
    • 12 Pressure-relief space
    • 13 Hydraulic valve
    • 14 Hydraulic medium supply
    • 15 Non-return valve
    • 16 Pressure storage device
    • 17 Bypass line
    • 18 Non-return valve
    • 19 Additional hydraulic valve

Claims (4)

1. Electrohydraulic valve controller for variable actuation of a gas-exchange valve of an internal combustion engine, comprising
a master piston driven by a camshaft,
a slave piston adapted to drive the gas-exchange valve,
a pressure space with variable volume defined by the master piston and the slave piston,
a pressure-relief space connected to a hydraulic medium supply of the internal combustion engine,
a control line connecting the pressure space to the pressure-relief space and an electrically controllable hydraulic valve that is arranged therein and adapted to open up or block a hydraulic medium flow through the control line,
a bypass line connecting the pressure space to the pressure-relief space and a non-return valve arranged therein adapted to openup a hydraulic medium flow through the bypass line into the pressure space and to block it into the pressure-relief space,
that the valve controller comprises an additional hydraulic valve that is arranged in the control line between the hydraulic valve and the pressure-relief space and is adapted to block, in case of the hydraulic valve being incorrectly open, the hydraulic medium flow through the control line into the pressure-relief space.
2. Electrohydraulic valve controller according to claim 1, wherein the hydraulic valve has a non-energized open construction.
3. Electrohydraulic valve controller according to claim 2, wherein the additional hydraulic valve has an electrically controllable and non-energized open construction.
4. Electrohydraulic valve controller according to claim 1, wherein the hydraulic valve has a significantly more quickly switching construction than the additional hydraulic valve.
US13/121,257 2008-09-26 2009-09-15 Electrohydraulic valve controller Abandoned US20110277712A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008049181.0 2008-09-26
DE102008049181A DE102008049181A1 (en) 2008-09-26 2008-09-26 Electrohydraulic valve control
PCT/EP2009/061895 WO2010034643A1 (en) 2008-09-26 2009-09-15 Electrohydraulic valve controller

Publications (1)

Publication Number Publication Date
US20110277712A1 true US20110277712A1 (en) 2011-11-17

Family

ID=41353850

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/121,257 Abandoned US20110277712A1 (en) 2008-09-26 2009-09-15 Electrohydraulic valve controller

Country Status (6)

Country Link
US (1) US20110277712A1 (en)
EP (1) EP2329116B1 (en)
KR (1) KR101581068B1 (en)
CN (1) CN102165148B (en)
DE (1) DE102008049181A1 (en)
WO (1) WO2010034643A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012221354A1 (en) 2012-11-22 2013-01-24 Schaeffler Technologies AG & Co. KG Hydraulic unit for cylinder head of internal combustion engine with hydraulically variable gas exchange valve train, has hydraulic connection, which is provided between high pressure chamber and medium-pressure chamber
WO2014114552A1 (en) * 2013-01-22 2014-07-31 Lsp Innovative Automotive Systems Gmbh Variable electrohydraulic valve controller
WO2015167412A1 (en) * 2014-04-29 2015-11-05 Ford Otomotiv Sanayi Anonim Sirketi Valve timing system
US10233795B2 (en) * 2017-02-15 2019-03-19 Schaeffler Technologies AG & Co. KG Bypass valve for pressure oscillation control
US20190211718A1 (en) * 2016-09-29 2019-07-11 Schaeffler Technologies AG & Co. KG Internal combustion engine with a hydraulically variable gas exchange valve train
US10982571B2 (en) 2017-05-22 2021-04-20 Bernd Niethammer Device for adjusting the stroke of a valve of internal combustion engines

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010022346A1 (en) 2010-06-01 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Electrohydraulic valve control
US8701607B2 (en) * 2011-08-25 2014-04-22 Chrysler Group Llc System and method for engine valve lift strategy
DE102015216866A1 (en) 2015-09-03 2017-03-09 Schaeffler Technologies AG & Co. KG Electrohydraulic valve control with variable valve lift and heat engine

Citations (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696265A (en) * 1984-12-27 1987-09-29 Toyota Jidosha Kabushiki Kaisha Device for varying a valve timing and lift for an internal combustion engine
US4697558A (en) * 1986-02-18 1987-10-06 Meneely Vincent A Compression relief engine brake
US4708406A (en) * 1985-10-04 1987-11-24 Nippondenso Co., Ltd. Hydraulic braking system with malfunction alarm junction
US4765288A (en) * 1985-09-12 1988-08-23 Robert Bosch Gmbh Valve control arrangement
US5005540A (en) * 1989-07-26 1991-04-09 Fuji Jukogyo Kabushiki Kaisha Valve timing control system for an internal combustion engine
US5113812A (en) * 1989-09-01 1992-05-19 Robert Bosch Gmbh Valve control apparatus with magnet valve for internal combustion engines
US5154143A (en) * 1989-11-25 1992-10-13 Robert Bosch Gmbh Electrohydraulic valve control device for internal combustion engines
US20030000488A1 (en) * 2000-01-14 2003-01-02 Jochen Burgdorf Method for operating an internal combustion engine
US6736082B2 (en) * 2001-06-29 2004-05-18 Statoil Asa Method and system for connecting an underwater buoy to a vessel
US6736092B2 (en) * 2002-07-01 2004-05-18 C.R.F. Societa Consortile Perazioni Internal-combustion engine with an electronically controlled hydraulic system for actuation of the valves and means for compensating changes in the operating conditions of the hydraulic
US20040094104A1 (en) * 2001-03-21 2004-05-20 Cuadro Diogenes Perez Hydraulic actuator for actuating a gas exchange valve of an internal combusition engine
US20040103868A1 (en) * 2001-11-13 2004-06-03 Ralph Engelberg Device for the control of at least one gas exchange valve
US6807937B2 (en) * 2001-07-06 2004-10-26 C.R.F. Societa Consortile Per Azioni Multi-cylinder diesel engine with variably actuated valves
US20050051024A1 (en) * 2003-09-03 2005-03-10 Sauer-Danfoss Aps Valve arrangement and hydraulic drive
US20060102121A1 (en) * 2004-11-12 2006-05-18 Detroit Diesel Corporation Internal EGR for an internal combustion engine
US7543449B2 (en) * 2003-01-29 2009-06-09 Cnh America Llc Hydraulic system for linear drives controlled by a displacer element
US20090250023A1 (en) * 2006-05-15 2009-10-08 Isuzu Motors Limited Variable valve driving device
US20090308340A1 (en) * 2008-06-11 2009-12-17 Gm Global Technology Operations, Inc. Cam-Driven Hydraulic Lost-Motion Mechanisms for Overhead Cam and Overhead Valve Valvetrains
US20100224148A1 (en) * 2009-03-05 2010-09-09 Schaeffler Technologies Gmbh & Co. Kg Hydraulic unit for a cylinder head of an internal combustion engine with hydraulically variable gas-exchange valve train
US20110036316A1 (en) * 2009-08-13 2011-02-17 International Engine Intellectual Property Company, Llc Intake valve closing hydraulic adjuster
US20110290204A1 (en) * 2010-06-01 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Electrohydraulic valve controller
US20120006289A1 (en) * 2010-05-17 2012-01-12 Schaeffler Technologies Gmbh & Co. Kg Method and control device for determining a characteristic viscosity variable of an oil
US20120067313A1 (en) * 2010-09-20 2012-03-22 Kia Motors Corporation Engine equipped with variable valve device
US20120240886A1 (en) * 2009-12-08 2012-09-27 Schaeffler Technologies AG & Co. KG Internal combustion engine having electrohydraulic valve control and method for operating said internal combustion eingein

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4206696C2 (en) * 1992-03-04 2000-12-14 Bosch Gmbh Robert Hydraulic valve control device for engine valves
JPH094424A (en) * 1995-06-19 1997-01-07 Nissan Motor Co Ltd Variable valve gear for internal combustion engine
FI101998B1 (en) * 1996-01-26 1998-09-30 Taimo Tapio Stenman Arrangement for controlling the functioning of the valves in an internal combustion engine
WO1999023378A1 (en) * 1997-11-04 1999-05-14 Diesel Engine Retarders, Inc. Lost motion valve actuation system
ITTO980060A1 (en) 1998-01-23 1999-07-23 Fiat Ricerche IMPROVEMENTS ON INTENRE COMBUSTION ENGINES WITH VARIABLE ACTING VALVES.
DE10048263A1 (en) * 2000-01-14 2001-07-19 Continental Teves Ag & Co Ohg Method for operating an internal combustion engine
US7069887B2 (en) * 2002-05-14 2006-07-04 Caterpillar Inc. Engine valve actuation system
DE102006053703A1 (en) * 2006-11-15 2008-06-05 Uwe Hammer Valve i.e. gas exchange valve, mechanism for use in internal combustion engine of motor vehicle, has control shaft with control contour rotated with cam shaft and actuating control valve, which controls oil flow

Patent Citations (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4696265A (en) * 1984-12-27 1987-09-29 Toyota Jidosha Kabushiki Kaisha Device for varying a valve timing and lift for an internal combustion engine
US4765288A (en) * 1985-09-12 1988-08-23 Robert Bosch Gmbh Valve control arrangement
US4708406A (en) * 1985-10-04 1987-11-24 Nippondenso Co., Ltd. Hydraulic braking system with malfunction alarm junction
US4697558A (en) * 1986-02-18 1987-10-06 Meneely Vincent A Compression relief engine brake
US5005540A (en) * 1989-07-26 1991-04-09 Fuji Jukogyo Kabushiki Kaisha Valve timing control system for an internal combustion engine
US5113812A (en) * 1989-09-01 1992-05-19 Robert Bosch Gmbh Valve control apparatus with magnet valve for internal combustion engines
US5154143A (en) * 1989-11-25 1992-10-13 Robert Bosch Gmbh Electrohydraulic valve control device for internal combustion engines
US20030000488A1 (en) * 2000-01-14 2003-01-02 Jochen Burgdorf Method for operating an internal combustion engine
US20040094104A1 (en) * 2001-03-21 2004-05-20 Cuadro Diogenes Perez Hydraulic actuator for actuating a gas exchange valve of an internal combusition engine
US6736082B2 (en) * 2001-06-29 2004-05-18 Statoil Asa Method and system for connecting an underwater buoy to a vessel
US6807937B2 (en) * 2001-07-06 2004-10-26 C.R.F. Societa Consortile Per Azioni Multi-cylinder diesel engine with variably actuated valves
US20040103868A1 (en) * 2001-11-13 2004-06-03 Ralph Engelberg Device for the control of at least one gas exchange valve
US6948462B2 (en) * 2001-11-13 2005-09-27 Robert Bosch Gmbh Device for the control of at least one gas exchange valve
US6736092B2 (en) * 2002-07-01 2004-05-18 C.R.F. Societa Consortile Perazioni Internal-combustion engine with an electronically controlled hydraulic system for actuation of the valves and means for compensating changes in the operating conditions of the hydraulic
US7543449B2 (en) * 2003-01-29 2009-06-09 Cnh America Llc Hydraulic system for linear drives controlled by a displacer element
US20050051024A1 (en) * 2003-09-03 2005-03-10 Sauer-Danfoss Aps Valve arrangement and hydraulic drive
US20060102121A1 (en) * 2004-11-12 2006-05-18 Detroit Diesel Corporation Internal EGR for an internal combustion engine
US20090250023A1 (en) * 2006-05-15 2009-10-08 Isuzu Motors Limited Variable valve driving device
US20090308340A1 (en) * 2008-06-11 2009-12-17 Gm Global Technology Operations, Inc. Cam-Driven Hydraulic Lost-Motion Mechanisms for Overhead Cam and Overhead Valve Valvetrains
US20100224148A1 (en) * 2009-03-05 2010-09-09 Schaeffler Technologies Gmbh & Co. Kg Hydraulic unit for a cylinder head of an internal combustion engine with hydraulically variable gas-exchange valve train
US20110036316A1 (en) * 2009-08-13 2011-02-17 International Engine Intellectual Property Company, Llc Intake valve closing hydraulic adjuster
US20120240886A1 (en) * 2009-12-08 2012-09-27 Schaeffler Technologies AG & Co. KG Internal combustion engine having electrohydraulic valve control and method for operating said internal combustion eingein
US20120006289A1 (en) * 2010-05-17 2012-01-12 Schaeffler Technologies Gmbh & Co. Kg Method and control device for determining a characteristic viscosity variable of an oil
US20110290204A1 (en) * 2010-06-01 2011-12-01 Schaeffler Technologies Gmbh & Co. Kg Electrohydraulic valve controller
US20120067313A1 (en) * 2010-09-20 2012-03-22 Kia Motors Corporation Engine equipped with variable valve device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012221354A1 (en) 2012-11-22 2013-01-24 Schaeffler Technologies AG & Co. KG Hydraulic unit for cylinder head of internal combustion engine with hydraulically variable gas exchange valve train, has hydraulic connection, which is provided between high pressure chamber and medium-pressure chamber
WO2014114552A1 (en) * 2013-01-22 2014-07-31 Lsp Innovative Automotive Systems Gmbh Variable electrohydraulic valve controller
WO2015167412A1 (en) * 2014-04-29 2015-11-05 Ford Otomotiv Sanayi Anonim Sirketi Valve timing system
US20190211718A1 (en) * 2016-09-29 2019-07-11 Schaeffler Technologies AG & Co. KG Internal combustion engine with a hydraulically variable gas exchange valve train
US10900389B2 (en) * 2016-09-29 2021-01-26 Schaeffler Technologies AG & Co. KG Internal combustion engine with a hydraulically variable gas exchange valve train
US10233795B2 (en) * 2017-02-15 2019-03-19 Schaeffler Technologies AG & Co. KG Bypass valve for pressure oscillation control
US10982571B2 (en) 2017-05-22 2021-04-20 Bernd Niethammer Device for adjusting the stroke of a valve of internal combustion engines

Also Published As

Publication number Publication date
EP2329116B1 (en) 2014-12-17
WO2010034643A1 (en) 2010-04-01
KR101581068B1 (en) 2015-12-29
CN102165148A (en) 2011-08-24
DE102008049181A1 (en) 2010-04-01
CN102165148B (en) 2013-07-17
KR20110059627A (en) 2011-06-02
EP2329116A1 (en) 2011-06-08

Similar Documents

Publication Publication Date Title
US20110277712A1 (en) Electrohydraulic valve controller
JP5011816B2 (en) Variable valve drive
JP3192200U (en) Electronically controlled hydraulic system for variable valve actuation of internal combustion engines with high-speed filling on the system high pressure side
JP4629111B2 (en) Equipment for internal combustion engines
CN102105657B (en) Control arrangement in piston engine
RU2459962C2 (en) Actuating device of decompression motor brake in internal combustion engine equipped with hydraulic pushers
JP4897216B2 (en) Internal combustion engine equipment
CN103388502B (en) A kind of full changeable electro-hydraulic air valve drive unit
AU2010249638A1 (en) Pneumatically actuated pilot valve
US20080173264A1 (en) Drive piston assembly for a valve actuator assembly
US20080035082A1 (en) Valve actuation mechanism
KR101623222B1 (en) Variable valve timing system using hydraulic system
CN101215978A (en) Engine air valve controlling mechanism
WO2004007931A3 (en) Hydraulic valve actuation methods and apparatus
US8726860B2 (en) Electrohydraulic valve controller
JP5184372B2 (en) Gas exchange valve actuator
CN103147815B (en) Electric hydaulic variable valve lift system
KR20090051562A (en) Variable valve lift apparatus
KR101657752B1 (en) An arrangement and a method of operating a gas exchange valve of an internal combustion engine, a cylinder head and a method of upgrading an internal combustion engine
JP2004360485A (en) Valve system cut-off device of internal combustion engine
JPH094425A (en) Variable valve gear for internal combustion engine
JP3159979U (en) An electronically controlled hydraulic system for valve actuation and an internal combustion engine having means for compensating for changes in operating conditions of the hydraulic fluid
KR101017794B1 (en) Electronic controlled exhaust valve actuating equipment using the mechanical hydraulic actuator for the diesel engine
KR101427962B1 (en) Piezo variable valve train for internal combustion engine
CN112554988A (en) Engine active multi-stage variable valve lift hydraulic tappet

Legal Events

Date Code Title Description
AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES GMBH & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAAS, MICHAEL;MORELLI, NICOLA;REEL/FRAME:026384/0152

Effective date: 20110523

AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: CHANGE OF NAME;ASSIGNOR:SCHAEFFLER TECHNOLOGIES GMBH & CO. KG;REEL/FRAME:027855/0525

Effective date: 20120119

STCB Information on status: application discontinuation

Free format text: EXPRESSLY ABANDONED -- DURING EXAMINATION