US20030154938A1 - Multicylinder internal -combustion engine with electronically controlled hydraulic device for controlling variable actuation of the valves, integrated in a pre-assembled unit mounted on the engine cylinder head - Google Patents
Multicylinder internal -combustion engine with electronically controlled hydraulic device for controlling variable actuation of the valves, integrated in a pre-assembled unit mounted on the engine cylinder head Download PDFInfo
- Publication number
- US20030154938A1 US20030154938A1 US10/259,450 US25945002A US2003154938A1 US 20030154938 A1 US20030154938 A1 US 20030154938A1 US 25945002 A US25945002 A US 25945002A US 2003154938 A1 US2003154938 A1 US 2003154938A1
- Authority
- US
- United States
- Prior art keywords
- engine
- valve
- assembled unit
- aforesaid
- valves
- 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.)
- Granted
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
- 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
- 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
- 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
Definitions
- the present invention relates to multicylinder internal-combustion engines of the type comprising:
- At least one intake valve and at least one exhaust valve for each cylinder each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes;
- At least one camshaft for activating the intake and exhaust valves of the engine cylinders by means of respective tappets
- each intake valve is controlled by the respective tappet against the action of the aforesaid elastic return means by interposition of hydraulic means that include a pressurized fluid chamber;
- said pressurized fluid chamber being designed to be connected by means of a solenoid valve to an exhaust channel in order to uncouple the valve from the respective tappet and bring about fast closing of the valve as a result of the respective elastic return means;
- electronic control means for controlling each solenoid valve so as to vary the time and the opening stroke of the respective intake valve according to one or more operating parameters of the engine
- the purpose of the present invention is to further improve the device described above.
- the subject of the present invention is a multicylinder engine having all the aforementioned characteristics and further comprising the characteristics that form the subject of the characterizing part of the annexed claim 1.
- FIG. 1 is a cross-sectional view of an engine according to the known art, of the type described in the European patent application EP-A-0 803 642 in the name of the present applicant;
- FIG. 2 is a cross-sectional view of a preferred embodiment of the engine according to the present invention.
- FIG. 3 is a perspective view of the pre-assembled unit incorporating the electro-hydraulic system for variable actuation of the intake valves of the engine according to the invention
- FIG. 4 is a plan view of the unit illustrated in FIG. 3;
- FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4.
- the internal-combustion engine described in the previously mentioned European patent application EP-A-0 803 642 in the name of the present applicant is a multicylinder engine, for example, a four-cylinder in-line engine comprising a cylinder head 1 .
- the cylinder head 1 comprises, for each cylinder, a cavity 2 formed in the base surface 3 of the head 1 , which defines the combustion chamber, and into which there give out two intake pipes 4 , 5 and two exhaust pipes 6 .
- Communication of the intake pipes 4 , 5 with the combustion chamber 2 is controlled by two intake valves 7 of the traditional poppet or mushroom type, each comprising a stem 8 slidably mounted in the body of the cylinder head 1 .
- Each valve 7 is recalled to the closing position by springs 9 set between an internal surface of the cylinder head 1 and an end cup or bucket 10 of the valve. Opening of the intake valve 7 is controlled, in the way that will be described hereinafter, by a camshaft 11 , which is mounted so that it can turn about an axis 12 within supports of the cylinder head 1 and which comprises a plurality of cams 14 for actuation of the valves.
- Each cam 14 for controlling an intake valve 7 cooperates with the cup 15 of a tappet 16 slidably mounted along an axis 17 , which, in the case of the example illustrated in the above-mentioned prior document, was set in a direction at substantially 90° with respect to the axis of the valve 7 .
- the tappet 16 is slidably mounted within a bushing 18 carried by a body 19 of a pre-assembled unit 20 , which incorporates all the electrical and hydraulic devices associated to operation of the intake valves, according to what is described in detail hereinafter.
- the tappet 16 is able to transmit a thrust to the stem 8 of the valve 7 so as to cause opening of the latter against the action of the elastic means 9 by fluids under pressure (typically oil coming from the lubricating circuit of the engine), which is present in a chamber C, and a piston 21 slidably mounted in a cylindrical body consisting of a bushing 22 , which is carried by the body 19 of the subassembly 20 .
- fluids under pressure typically oil coming from the lubricating circuit of the engine
- the solenoid valve 24 which may be of any known type suitable for the function illustrated herein, is controlled by electronic control means, designated as a whole by 25 , according to the signals S that indicate operating parameters of the engine, such as the position of the accelerator and the engine r.p.m.
- the solenoid valve 24 When the solenoid valve 24 is opened, the chamber C enters into communication with the channel 23 , so that the pressurized fluid present in the chamber C flows into the channel 23 and there is obtained a decoupling of the tappet 16 from the respective intake valve 7 , which then rapidly returns to its closing position under the action of the return spring 9 .
- By controlling communication between the chamber C and the outlet channel 23 it is therefore possible to vary the time and stroke of opening of each intake valve 7 as desired.
- the outlet channels 23 of the various solenoid valves 24 all give out into one and the same longitudinal channel 26 , which communicates with four pressure accumulators 27 , only one of which is visible in FIG. 1. All the tappets 16 with the associated bushings 18 , the pistons 21 with the associated bushings 22 , the solenoid valves 24 and the corresponding channels 23 , 26 are carried and made out of the aforesaid body 19 of the pre-assembled unit 20 , to the advantage of speed and ease of assembly of the engine.
- the exhaust valves 27 associated to each cylinder are controlled, in the embodiment illustrated in FIG. 1, in a traditional way, by a camshaft 28 by means of respective tappets 29 , even though, in principle, there is not ruled out, both in the case of the prior document cited above and in the case of the present invention, an application of the system for variable actuation of the valves also under control of the exhaust valves.
- FIG. 2 of the attached drawings illustrates, in cross-sectional view, the cylinder head of an example of embodiment of the engine according to the invention.
- the cylinder head incorporates a pre-assembled unit, which integrates the electro-hydraulic system of variable operation of the intake valves.
- FIG. 2 is a clear illustration of one of said supports, defined in part by a semicircular seat 11 a made directly in the body 19 , and in part in an opposed semicircular seat made in a cap 11 b fixed by means of screws to the body 19 .
- channels or ports 19 m which enable arrival of lubricant to the supporting seats of the camshaft (see FIG. 2).
- the ports 19 m branch off from a continuous longitudinal tunnel 19 n, which is made in the body 19 of the pre-assembled unit.
- FIG. 5 of the attached drawing shows the way in which the lubricant reaches the longitudinal tunnel 19 n.
- the oil coming from the engine lubrication circuit enters the unit 19 through an inlet opening 40 , a non-return valve 41 , which prevents emptying of the oil from the circuit into the body 19 , a pipe 42 , and a chamber 43 .
- the chamber 43 communicates at the top with a calibrated breather hole 44 , which enables release into the outside environment of the air contained in the oil flow.
- the chamber 43 communicates with the longitudinal tunnel 19 n by means of a filter 45 , which is in itself of a known type.
- a further characteristic of the pre-assembled unit forming part of the engine according to the invention lies in the fact that the body 19 includes cavities or storage areas 46 (see FIG. 6) for accumulation of the oil present in the circuit, the said cavities each being provided at the top with a calibrated hole 47 for release of the air present in the oil.
- the pre-assembled unit 20 is closed at the top by a lid 50 (see FIGS. 3 and 8).
- the lid 50 has a peripheral base edge having a perimetral groove 51 for mounting of a seal designed to be set between the lid 50 and the engine cylinder head.
- the body of the lid has a central rectangular hole delimited by a perimetral edge having a peripheral groove 52 , designed to receive a further annular seal for separating the oil-bath environment from the area of the solenoid valves, which come out of the lid 50 through the central opening delimited by the seal mounted in the groove 52 .
- the coils of the solenoid valves are dry, and the wiring of the coils can be integrated on a common bracket 60 for fixing the solenoid valves, the said bracket being fastened by means of screws 61 to the body 19 (FIG. 7).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
- The present invention relates to multicylinder internal-combustion engines of the type comprising:
- at least one intake valve and at least one exhaust valve for each cylinder, each valve being provided with respective elastic return means, which push the valve towards a closed position for controlling respective intake and exhaust pipes; and
- at least one camshaft, for activating the intake and exhaust valves of the engine cylinders by means of respective tappets;
- in which each intake valve is controlled by the respective tappet against the action of the aforesaid elastic return means by interposition of hydraulic means that include a pressurized fluid chamber;
- said pressurized fluid chamber being designed to be connected by means of a solenoid valve to an exhaust channel in order to uncouple the valve from the respective tappet and bring about fast closing of the valve as a result of the respective elastic return means;
- electronic control means for controlling each solenoid valve so as to vary the time and the opening stroke of the respective intake valve according to one or more operating parameters of the engine;
- in which the hydraulic control means for controlling the intake valves of the engine and the solenoid valves associated thereto form part of a pre-assembled unit mounted on the engine cylinder head.
- An engine of the type specified above is, for example, described and illustrated in the European patent application EP-A-0 803 642 in the name of the present applicant.
- The purpose of the present invention is to further improve the device described above.
- With a view to achieving the above purpose, the subject of the present invention is a multicylinder engine having all the aforementioned characteristics and further comprising the characteristics that form the subject of the characterizing part of the annexed claim 1.
- The present invention will now be described, with reference to the attached drawings, which are provided purely by way of non-limiting example, and in which:
- FIG. 1 is a cross-sectional view of an engine according to the known art, of the type described in the European patent application EP-A-0 803 642 in the name of the present applicant;
- FIG. 2 is a cross-sectional view of a preferred embodiment of the engine according to the present invention;
- FIG. 3 is a perspective view of the pre-assembled unit incorporating the electro-hydraulic system for variable actuation of the intake valves of the engine according to the invention;
- FIG. 4 is a plan view of the unit illustrated in FIG. 3; and
- FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4.
- With reference to FIG. 1, the internal-combustion engine described in the previously mentioned European patent application EP-A-0 803 642 in the name of the present applicant is a multicylinder engine, for example, a four-cylinder in-line engine comprising a cylinder head1. The cylinder head 1 comprises, for each cylinder, a
cavity 2 formed in thebase surface 3 of the head 1, which defines the combustion chamber, and into which there give out two intake pipes 4, 5 and twoexhaust pipes 6. Communication of the intake pipes 4, 5 with thecombustion chamber 2 is controlled by two intake valves 7 of the traditional poppet or mushroom type, each comprising a stem 8 slidably mounted in the body of the cylinder head 1. Each valve 7 is recalled to the closing position by springs 9 set between an internal surface of the cylinder head 1 and an end cup orbucket 10 of the valve. Opening of the intake valve 7 is controlled, in the way that will be described hereinafter, by acamshaft 11, which is mounted so that it can turn about anaxis 12 within supports of the cylinder head 1 and which comprises a plurality ofcams 14 for actuation of the valves. - Each
cam 14 for controlling an intake valve 7 cooperates with thecup 15 of atappet 16 slidably mounted along anaxis 17, which, in the case of the example illustrated in the above-mentioned prior document, was set in a direction at substantially 90° with respect to the axis of the valve 7. Thetappet 16 is slidably mounted within abushing 18 carried by abody 19 of apre-assembled unit 20, which incorporates all the electrical and hydraulic devices associated to operation of the intake valves, according to what is described in detail hereinafter. Thetappet 16 is able to transmit a thrust to the stem 8 of the valve 7 so as to cause opening of the latter against the action of the elastic means 9 by fluids under pressure (typically oil coming from the lubricating circuit of the engine), which is present in a chamber C, and apiston 21 slidably mounted in a cylindrical body consisting of abushing 22, which is carried by thebody 19 of thesubassembly 20. Once again in the known solution illustrated in FIG. 1, the pressurized-fluid chamber C, associated to each intake valve 7, can be set in communication with anoutlet channel 23 by means of asolenoid valve 24. Thesolenoid valve 24, which may be of any known type suitable for the function illustrated herein, is controlled by electronic control means, designated as a whole by 25, according to the signals S that indicate operating parameters of the engine, such as the position of the accelerator and the engine r.p.m. When thesolenoid valve 24 is opened, the chamber C enters into communication with thechannel 23, so that the pressurized fluid present in the chamber C flows into thechannel 23 and there is obtained a decoupling of thetappet 16 from the respective intake valve 7, which then rapidly returns to its closing position under the action of the return spring 9. By controlling communication between the chamber C and theoutlet channel 23, it is therefore possible to vary the time and stroke of opening of each intake valve 7 as desired. - The
outlet channels 23 of thevarious solenoid valves 24 all give out into one and the samelongitudinal channel 26, which communicates with fourpressure accumulators 27, only one of which is visible in FIG. 1. All thetappets 16 with the associatedbushings 18, thepistons 21 with the associatedbushings 22, thesolenoid valves 24 and thecorresponding channels aforesaid body 19 of thepre-assembled unit 20, to the advantage of speed and ease of assembly of the engine. - The
exhaust valves 27 associated to each cylinder are controlled, in the embodiment illustrated in FIG. 1, in a traditional way, by acamshaft 28 by means ofrespective tappets 29, even though, in principle, there is not ruled out, both in the case of the prior document cited above and in the case of the present invention, an application of the system for variable actuation of the valves also under control of the exhaust valves. - FIG. 2 of the attached drawings illustrates, in cross-sectional view, the cylinder head of an example of embodiment of the engine according to the invention. As in the case of FIG. 1, the cylinder head incorporates a pre-assembled unit, which integrates the electro-hydraulic system of variable operation of the intake valves.
- In FIG. 2 and in the subsequent figures, parts that are in common with those of FIG. 1 are designated using the same reference numbers.
- A first important characteristic of the pre-assembled unit that forms part of the engine according to the invention lies in the fact that it integrates also the supports on which the
camshaft 11 is mounted so that it can turn. FIG. 2 is a clear illustration of one of said supports, defined in part by asemicircular seat 11 a made directly in thebody 19, and in part in an opposed semicircular seat made in a cap 11 b fixed by means of screws to thebody 19. - According to a further characteristic of the invention, made in the
body 19 are channels orports 19 m which enable arrival of lubricant to the supporting seats of the camshaft (see FIG. 2). Theports 19 m branch off from a continuouslongitudinal tunnel 19 n, which is made in thebody 19 of the pre-assembled unit. - FIG. 5 of the attached drawing shows the way in which the lubricant reaches the
longitudinal tunnel 19 n. The oil coming from the engine lubrication circuit enters theunit 19 through an inlet opening 40, anon-return valve 41, which prevents emptying of the oil from the circuit into thebody 19, apipe 42, and achamber 43. Thechamber 43 communicates at the top with acalibrated breather hole 44, which enables release into the outside environment of the air contained in the oil flow. At the bottom, thechamber 43 communicates with thelongitudinal tunnel 19 n by means of afilter 45, which is in itself of a known type. - A further characteristic of the pre-assembled unit forming part of the engine according to the invention lies in the fact that the
body 19 includes cavities or storage areas 46 (see FIG. 6) for accumulation of the oil present in the circuit, the said cavities each being provided at the top with acalibrated hole 47 for release of the air present in the oil. - The
pre-assembled unit 20 is closed at the top by a lid 50 (see FIGS. 3 and 8). With reference in particular to FIG. 8, thelid 50 has a peripheral base edge having aperimetral groove 51 for mounting of a seal designed to be set between thelid 50 and the engine cylinder head. The body of the lid has a central rectangular hole delimited by a perimetral edge having aperipheral groove 52, designed to receive a further annular seal for separating the oil-bath environment from the area of the solenoid valves, which come out of thelid 50 through the central opening delimited by the seal mounted in thegroove 52. Thanks to the aforesaid arrangement, the coils of the solenoid valves are dry, and the wiring of the coils can be integrated on acommon bracket 60 for fixing the solenoid valves, the said bracket being fastened by means ofscrews 61 to the body 19 (FIG. 7). - Of course, without prejudice to the principle of the invention, the details of construction and the embodiments may vary widely with respect to what is described and illustrated purely by way of example, without thereby departing from the scope of the present invention.
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO2002A000149 | 2002-02-21 | ||
ITT02002A000149 | 2002-02-21 | ||
IT2002TO000149A ITTO20020149A1 (en) | 2002-02-21 | 2002-02-21 | INTERNAL COMBUSTION MULTI-CYLINDER ENGINE WITH ELECTRONICALLY CONTROLLED HYDRAULIC DEVICE FOR VARIABLE VALVE OPERATION, IN |
Publications (2)
Publication Number | Publication Date |
---|---|
US6601553B1 US6601553B1 (en) | 2003-08-05 |
US20030154938A1 true US20030154938A1 (en) | 2003-08-21 |
Family
ID=27621227
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/259,450 Expired - Lifetime US6601553B1 (en) | 2002-02-21 | 2002-09-30 | Multicylinder internal-combustion engine with electronically controlled hydraulic device for controlling variable actuation of the valves, integrated in a pre-assembled unit mounted on the engine cylinder head |
Country Status (7)
Country | Link |
---|---|
US (1) | US6601553B1 (en) |
EP (1) | EP1338764B1 (en) |
JP (1) | JP4116386B2 (en) |
AT (1) | ATE261543T1 (en) |
DE (1) | DE60200252T2 (en) |
ES (1) | ES2213131T3 (en) |
IT (1) | ITTO20020149A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1653057A1 (en) * | 2004-10-28 | 2006-05-03 | C.R.F. Società Consortile per Azioni | Internal combustion engine having an electronically controlled hydraulic device for variably actuating intake valves |
EP2230390A1 (en) | 2007-04-27 | 2010-09-22 | Schwäbische Hüttenwerke Automotive GmbH | Cam shaft phaser and vacuum pump for a combustion engine |
EP2597276A1 (en) * | 2011-11-24 | 2013-05-29 | C.R.F. Società Consortile per Azioni | Internal combustion engine having a system for variable actuation of the intake valves, provided with a three-way solenoid valve |
WO2014015869A1 (en) * | 2012-07-24 | 2014-01-30 | Schaeffler Technologies AG & Co. KG | Method for operating an internal combustion engine with electrohydraulic valve control means |
US9175630B2 (en) | 2012-07-31 | 2015-11-03 | C.R.F. Societa Consortile Per Azioni | Internal-combustion engine having a system for variable actuation of the intake valves, provided with three-way solenoid valves, and method for controlling said engine |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004004753A1 (en) * | 2004-01-30 | 2005-08-18 | Mann + Hummel Gmbh | Cylinder head cover |
DE102006008676A1 (en) * | 2006-02-24 | 2007-08-30 | Schaeffler Kg | Cylinder head for internal combustion engine of vehicle, has filling device for initial filling of pressure discharge chamber and/or pressure chamber with hydraulic medium, where device is formed at housing |
DE602008001371D1 (en) | 2008-04-10 | 2010-07-08 | Fiat Ricerche | Turbofuel engine with variable control of intake valves |
ATE499511T1 (en) | 2008-11-07 | 2011-03-15 | Fiat Ricerche | DIESEL ENGINE WITH VARIABLE INLET VALVE OPERATION AND INTERNAL EXHAUST GAS RECIRCULATION |
EP2184451B1 (en) | 2008-11-07 | 2011-08-17 | C.R.F. Società Consortile per Azioni | Diesel engine having cams for driving the intake valves which have a main lobe and an additional lobe connected to each other |
EP2204566B1 (en) | 2008-12-29 | 2011-06-29 | Fiat Group Automobiles S.p.A. | Adaptive control system of the air-fuel ratio of an internal combustione engine with a variable valve timing system |
EP2282022B1 (en) | 2009-06-30 | 2011-11-23 | C.R.F. Società Consortile per Azioni | Electronically controlled hydraulic system for variable actuation of the valves of an internal combustion engine, with fast filling of the high pressure side of the system |
EP2397674B1 (en) | 2010-06-18 | 2012-10-24 | C.R.F. Società Consortile per Azioni | Internal combustion engine with cylinders that can be de-activated, with exhaust gas recirculation by variable control of the intake valves, and method for controlling an internal combustion engine |
US8833321B2 (en) * | 2011-01-05 | 2014-09-16 | Chrysler Group Llc | Cylinder head cover module with integrated valve train |
EP2554807B1 (en) | 2011-08-01 | 2014-01-01 | C.R.F. Società Consortile per Azioni | Multi-cylinder internal combustion engine with a system for variable actuation of the intake valves subdivided into separate sub-units |
EP2554830A1 (en) * | 2011-08-01 | 2013-02-06 | C.R.F. Società Consortile per Azioni | Multi-cylinder internal combustion engine with a system for variable actuation of the intake valves and an injector housing having a raised sealing edge |
EP2653703B1 (en) | 2012-04-19 | 2014-04-30 | C.R.F. Società Consortile per Azioni | Internal combustion engine with cylinders which can be deactivated, in which the deactivated cylinders are used as pumps for recirculating exhaust gases into the active cylinders, and method for controlling this engine |
EP2657470B1 (en) | 2012-04-26 | 2015-05-27 | C.R.F. Società Consortile per Azioni | A method for controlling a valve control system with variable valve lift of an internal combustion engine by operating a compensation in response to the deviation of the characteristics of a working fluid with respect to nominal conditions |
DE102012213399A1 (en) * | 2012-07-31 | 2014-02-06 | Schaeffler Technologies AG & Co. KG | Method for controlling shift operation of electromagnetic switching valve for combustion engine, involves performing control of counter-movement of armature of electromagnetic unit based on temperature of switching valve |
DE102013224501A1 (en) | 2013-11-29 | 2015-06-03 | Schaeffler Technologies AG & Co. KG | Delay unit with sliding sleeve for a gas exchange valve |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1056206A (en) * | 1952-01-12 | 1954-02-25 | Hydraulic valve control | |
JPS543B2 (en) * | 1974-02-28 | 1979-01-05 | ||
US4615306A (en) * | 1984-01-30 | 1986-10-07 | Allied Corporation | Engine valve timing control system |
DE3511819A1 (en) * | 1985-03-30 | 1986-10-09 | Robert Bosch Gmbh, 7000 Stuttgart | VALVE CONTROL DEVICE |
DE3641129C1 (en) * | 1986-12-02 | 1987-07-30 | Daimler Benz Ag | Device for mounting two camshafts in the cylinder head of a multi-cylinder in-line internal combustion engine |
US4887562A (en) * | 1988-09-28 | 1989-12-19 | Siemens-Bendix Automotive Electronics L.P. | Modular, self-contained hydraulic valve timing systems for internal combustion engines |
IT1285853B1 (en) * | 1996-04-24 | 1998-06-24 | Fiat Ricerche | INTERNAL COMBUSTION ENGINE WITH VARIABLE OPERATION VALVES. |
IT1302071B1 (en) * | 1998-02-26 | 2000-07-20 | Fiat Ricerche | INTERNAL COMBUSTION ENGINE WITH VARIABLE OPERATION VALVES. |
GB2348245B (en) * | 1999-03-25 | 2002-10-23 | Ricardo Inc | Valvegear for engines of reciprocating piston type |
-
2002
- 2002-02-21 IT IT2002TO000149A patent/ITTO20020149A1/en unknown
- 2002-08-02 DE DE60200252T patent/DE60200252T2/en not_active Expired - Lifetime
- 2002-08-02 EP EP02017369A patent/EP1338764B1/en not_active Expired - Lifetime
- 2002-08-02 AT AT02017369T patent/ATE261543T1/en active
- 2002-08-02 ES ES02017369T patent/ES2213131T3/en not_active Expired - Lifetime
- 2002-09-27 JP JP2002283277A patent/JP4116386B2/en not_active Expired - Lifetime
- 2002-09-30 US US10/259,450 patent/US6601553B1/en not_active Expired - Lifetime
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1653057A1 (en) * | 2004-10-28 | 2006-05-03 | C.R.F. Società Consortile per Azioni | Internal combustion engine having an electronically controlled hydraulic device for variably actuating intake valves |
US20060090718A1 (en) * | 2004-10-28 | 2006-05-04 | C.R.F. Societa Consortile Per Azioni | Internal-combustion engine having an electronically controlled hydraulic device for variably actuating intake valves |
US7171932B2 (en) | 2004-10-28 | 2007-02-06 | C.R.F. Societa Consortile Per Azioni | Internal-combustion engine having an electronically controlled hydraulic device for variably actuating intake valves |
EP2230390A1 (en) | 2007-04-27 | 2010-09-22 | Schwäbische Hüttenwerke Automotive GmbH | Cam shaft phaser and vacuum pump for a combustion engine |
EP2230390B1 (en) * | 2007-04-27 | 2017-08-02 | Schwäbische Hüttenwerke Automotive GmbH | Cam shaft phaser and vacuum pump for a combustion engine |
EP2597276A1 (en) * | 2011-11-24 | 2013-05-29 | C.R.F. Società Consortile per Azioni | Internal combustion engine having a system for variable actuation of the intake valves, provided with a three-way solenoid valve |
US8844480B2 (en) | 2011-11-24 | 2014-09-30 | C.R.F. Societa Consortile Per Azioni | Internal-combustion engine having a system for variable actuation of the intake valves, provided with three-way solenoid valves |
WO2014015869A1 (en) * | 2012-07-24 | 2014-01-30 | Schaeffler Technologies AG & Co. KG | Method for operating an internal combustion engine with electrohydraulic valve control means |
US9435231B2 (en) | 2012-07-24 | 2016-09-06 | Schaeffler Technologies AG & Co. KG | Method for operating an internal combustion engine with electrohydraulic valve control means |
US9175630B2 (en) | 2012-07-31 | 2015-11-03 | C.R.F. Societa Consortile Per Azioni | Internal-combustion engine having a system for variable actuation of the intake valves, provided with three-way solenoid valves, and method for controlling said engine |
Also Published As
Publication number | Publication date |
---|---|
ATE261543T1 (en) | 2004-03-15 |
JP2003254021A (en) | 2003-09-10 |
ITTO20020149A1 (en) | 2003-08-21 |
JP4116386B2 (en) | 2008-07-09 |
US6601553B1 (en) | 2003-08-05 |
ITTO20020149A0 (en) | 2002-02-21 |
EP1338764A1 (en) | 2003-08-27 |
EP1338764B1 (en) | 2004-03-10 |
DE60200252T2 (en) | 2004-08-12 |
ES2213131T3 (en) | 2004-08-16 |
DE60200252D1 (en) | 2004-04-15 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US6601553B1 (en) | Multicylinder internal-combustion engine with electronically controlled hydraulic device for controlling variable actuation of the valves, integrated in a pre-assembled unit mounted on the engine cylinder head | |
US7171932B2 (en) | Internal-combustion engine having an electronically controlled hydraulic device for variably actuating intake valves | |
US6918364B2 (en) | Multicylinder engine with valve variable actuation, and an improved valve braking device therefor | |
US4729349A (en) | Oil supply system for a valve operating mechanism in internal combustion engines | |
US6553950B2 (en) | Internal-combustion engine with variable-operation valves and auxiliary hydraulic tappet | |
JPH048604B2 (en) | ||
US20060054118A1 (en) | Internal combustion engine having valves with variable actuation and hydraulic actuating units which control the valves by means of rocker arms | |
US6520130B2 (en) | Internal-combustion engine with hydraulic system for variable operation of the valves and with means for bleeding the hydraulic system | |
EP2554830A1 (en) | Multi-cylinder internal combustion engine with a system for variable actuation of the intake valves and an injector housing having a raised sealing edge | |
EP2511504B1 (en) | Multi-cylinder internal combustion engine with a system for variable actuation of the intake valves and with compensation of the differences in the torque produced by the cylinders, and control method implemented in this engine | |
US6520129B2 (en) | Internal combustion engine with an hydraulic system for the variable driving of valves and a double-piston tappet | |
US6289859B1 (en) | V-shaped internal combustion engine | |
JP4009477B2 (en) | Improvement of internal combustion engine with hydraulic system for variable operation of engine valve | |
EP2554807B1 (en) | Multi-cylinder internal combustion engine with a system for variable actuation of the intake valves subdivided into separate sub-units | |
CA2103754A1 (en) | Valve gear for at least two simultaneously operated overhead valves | |
US8166938B2 (en) | Engine camshaft cover with integrated oil passages for camshaft phaser actuation | |
US6755162B1 (en) | Distributed accumulator for hydraulic camless valve actuation system | |
JPS61167109A (en) | Mechanical valve lifter device for internal-combustion engine |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: C.R.F. SOCIETA CONSORTILE PER AZIONI, ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:VATTANEO, FRANCESCO;PECORI, ANDREA;MACOR, LORENTINO;REEL/FRAME:013349/0641 Effective date: 20020527 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: C.R.F. SOCIETA CONSORTILE PER AZIONI, ITALY Free format text: RECORD TO CORRECT ASSIGNMENT RECORDED SEPT. 30, 2002 AT REEL 013349, FRAME 0641;ASSIGNORS:VATTANEO, FRANCESCO;PECORI, ANDREA;MACOR, LORENTINO;REEL/FRAME:013700/0236 Effective date: 20020527 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
FPAY | Fee payment |
Year of fee payment: 8 |
|
FPAY | Fee payment |
Year of fee payment: 12 |