EP2315919A1 - A control arrangement in a piston engine - Google Patents
A control arrangement in a piston engineInfo
- Publication number
- EP2315919A1 EP2315919A1 EP09784154A EP09784154A EP2315919A1 EP 2315919 A1 EP2315919 A1 EP 2315919A1 EP 09784154 A EP09784154 A EP 09784154A EP 09784154 A EP09784154 A EP 09784154A EP 2315919 A1 EP2315919 A1 EP 2315919A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chamber
- inlet valve
- cam
- control arrangement
- cam profile
- 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
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006735 deficit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000013531 gin Nutrition 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L1/255—Hydraulic tappets between cam and rocker arm
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0031—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of tappet or pushrod length
-
- 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L2013/0089—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque with means for delaying valve closing
-
- 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- the invention relates to a control arrangement for gas exchange in a piston engine in accordance with the preamble of claim 1.
- the timing of the inlet valves needs to be such that the inlet valve is closed early before the bottom dead centre of the piston, while the boost pressure is raised accord- ingly so as to get a sufficient amount of air to the cylinder.
- This kind of arrangement is, however, problematic with low engine loads, when the boost pressure of the turbocharger is still relatively low.
- One solution could be intensified supply of inlet air during the opening phase of the inlet valve under such special situations.
- Another solution is to provide for a delay in the closing of the inlet valve for prolonging the opening time of the inlet valve when needed.
- VIP variable inlet valve closure
- An object of the invention is to provide a further improved control arrangement for gas exchange in a piston engine, which is particularly applicable in two- stage turbo charged engines and solves the above mentioned problems apparent in such engines when operated under low engine loads and during start of the engine.
- the cam device includes a cam profile having a portion arranged under a base circle of the cam profile, whereby said portion of the cam profile is arranged to control gas exchange through the inlet valve.
- a constructionally simple and reliable way of control can be provided so that the deficit of air specifically under low load situations and start of the engine can be compensated.
- sharp cam nose forms are utilised it is of advantage to provide for effective delaying of the closing movement of the inlet valve early during the closing phase thereof under said special situations.
- the invention can with advantage be availed of by arranging the form of the cam profile to determine the ending of the delaying effect.
- the portion of the cam profile under the base circle is with advantage arranged to be utilised for increasing the supply of air through the inlet valve.
- an auxiliary boost of air it may not be necessary to increase the total opening time of the inlet valve.
- the piston device is in force transmission connection with the cam shaft at least in the direction for opening the inlet valve.
- the body part and the piston device together define a first chamber, into which hydraulic medium can be selectively fed for providing a delay in the closing of the inlet valve.
- the portion of the cam profile under the base circle can with advantage be arranged to be utilised for controlling the releasing of pressure in said first chamber.
- the first chamber can then be connected to a second chamber via a duct, whereby the opening of the duct into the second chamber is selectively con- trolled by a guide member arranged in said second chamber between the cam device and the piston device.
- the guide member is arranged to directly act on the piston device only in the direction for opening the inlet valve.
- the return movement of the piston device may with advantage be utilised for proving the delay function.
- the guide member includes a releasing groove in the mantle surface thereof.
- the guide member is spring loaded towards the cam device.
- the first chamber includes with advantage a stopper surface defining the lowermost position of the piston device, said position being selected so that a gap is left between the piston device and the guide member when guided by the portion of the cam profile under the base circle.
- a stopper surface defining the lowermost position of the piston device, said position being selected so that a gap is left between the piston device and the guide member when guided by the portion of the cam profile under the base circle.
- VOC variable inlet valve closure
- FIG. 1 shows a piston engine and a skeleton diagram of its valve mechanism
- FIG. 2 - 6 show an embodiment of a control arrangement according to the invention in separate consecutive stages of operation.
- FIG. 1 shows a schematic view of a piston engine 1 as far as it is relevant to the understanding of the invention.
- the gas exchange of the cylinders (not shown) in the piston engine 1 is carried out under the control of gas exchange valves, i.e. inlet valves and exhaust valves, located on a cylinder head 2. Only inlet valves 3 are shown and they are operated by means of valve mechanisms
- each valve mechanism 6 which are typically guided by cam profiles 5' of cam devices 5 arranged on a camshaft 4 of the engine.
- the force transmission connection between each valve mechanism 6 and the corresponding cam device 5 is realised by a control arrangement 7.
- the control arrangement 7 is shown in more detail in Figures 2 - 6, of which Figure 2 shows it in an unoperated state, whereby the inlet valve 3 in connec- tion therewith is closed.
- the control arrangement 7 comprises a body part 8, which is typically attached to the engine body.
- a piston device 9 is movably arranged within the body part 8.
- the upper end of the piston device 9 is arranged in force transmission connection with the valve mechanism 6 (not shown closer). This connection may be mechanical or hydraulic.
- the movements of the piston device 9 are controlled by a guide member 10 arranged at the lower end of the piston device within the body part 8.
- the guide member 10 is in engagement with and urged by a spring 11 towards a roller 12, which receives its guidance from the cam profile 5' of the cam device 5.
- the roller 12 follows the cam profile 5' of the cam device 5, and the changes in the cam profile 5' are transmitted so as to affect the opening and closing of the inlet valve 3.
- the cam profile 5' has a base circle 5a with radius R.
- a nose 5b extends from the base circle and is arranged to move the piston device 8 upwards in the fig- ures for providing opening of the inlet valve 3.
- the cam profile 5' includes a portion 5c arranged under the base circle 5a of the cam profile 5' having thus radius smaller than the radius R.
- the portion 5c need not have a constant radius. The effect of the portion 5c to the operation of the control arrangement 7 and the inlet valve 3 will be explained more in detail below.
- the body part 8 and the piston device 9 together define a first chamber 13, into which hydraulic medium can be selectively fed for providing a delay in the closing of the inlet valve 3.
- the feed line is provided with a shut-off valve 14 and a non-return valve 15.
- the shut-off valve 14 By means of the shut-off valve 14 the feed line to the first chamber 13 may be connected or disconnected, depending on whether or not the aim is to use the delay function for the delayed closing of the inlet valve 3.
- Due to the non-return valve 15 the control arrangement cannot cause any pulsations in the source of hydraulic medium. This is of importance when lubricating oil is used as a hydraulic medium.
- the body part 8 is additionally provided with a duct 16 by means of which the first chamber 13 can be connected with a second chamber 17, which is defined by the body part 8 and the guide member 10 and in which the lower end of the piston device 9 is located. Also the spring 11 is located in this second chamber 17.
- the cam device 5 has rotated further counter-clockwise so that the roller 12 has entered the portion 5c which is located under the base circle 5a of the cam profile 5'.
- the guide element 10 has moved downwards in the figure as well so that a releasing groove 10a in the mantle surface of the guiding member 10 has moved at the position of the duct 16 connecting the first and the second chambers 13 resp. 17.
- the releasing groove 10a is in connection (not shown) with the second chamber 17 which for its part is connected with ducts 18 to an oil sump providing lubrication for the camshaft and the parts connected therewith.
- the portion 5c of the cam profile 5' is arranged to control gas exchange through the inlet valve by providing releasing of pressure for ending the delay function relating to prolonged opening of the inlet valve.
- variable inlet valve closure (VIC) function related to the chamber 13 is not utilised the stopper surface 13a makes sure that the piston device does not follow the cam profile at the po- sition of the portion of the cam profile under the base circle.
- the movement of the piston device 9 is stopped by the stopper surface 13a the movement of the guiding member 10 together with the releasing groove 10a is continued ensuring that communication between the chamber 13 with the chamber 17 is established in a normal way.
- the deficit of air under low load situations and start of the engine which is largely due to cam nose form extending in the direction of rotation of the cam shaft substantially less than conventionally thereby shortening the opening time of the inlet valve availed of in large two-stage turbo en- gines, can be compensated.
- Large internal combustion engines refer here to such engines that are used, for example, as main propulsion engines or auxiliary engines in ships or in power plants for the production of heat and/or electricity.
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
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20085756A FI124120B (en) | 2008-07-31 | 2008-07-31 | Steering arrangement in piston engine |
PCT/FI2009/050626 WO2010012864A1 (en) | 2008-07-31 | 2009-07-15 | A control arrangement in a piston engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2315919A1 true EP2315919A1 (en) | 2011-05-04 |
EP2315919B1 EP2315919B1 (en) | 2016-08-24 |
Family
ID=39677632
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09784154.8A Active EP2315919B1 (en) | 2008-07-31 | 2009-07-15 | A control arrangement in a piston engine |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP2315919B1 (en) |
JP (1) | JP5393784B2 (en) |
KR (1) | KR101545768B1 (en) |
CN (1) | CN102105657B (en) |
FI (1) | FI124120B (en) |
RU (1) | RU2509219C2 (en) |
WO (1) | WO2010012864A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI123065B (en) * | 2011-05-17 | 2012-10-31 | Waertsilae Finland Oy | Piston engine with several cylinders |
FI124085B (en) * | 2011-05-17 | 2014-03-14 | Wärtsilä Finland Oy | Multi-cylinder piston engine |
CN102514218B (en) * | 2011-12-21 | 2015-05-06 | 严俏敏 | Crankshaft cam of powder forming machine |
FI124349B (en) * | 2012-03-09 | 2014-07-15 | Wärtsilä Finland Oy | Hydraulic actuator and throttle valve arrangement |
FI124813B (en) * | 2013-01-07 | 2015-01-30 | Wärtsilä Finland Oy | Control arrangement and method for controlling the exhaust valve |
BR112015018967A2 (en) | 2013-02-08 | 2017-07-18 | 3M Innovative Properties Co | optical construction |
US9091184B2 (en) * | 2013-03-31 | 2015-07-28 | Jacobs Vehicle Systems, Inc. | Controlling motion of a moveable part |
CN103388500A (en) * | 2013-08-13 | 2013-11-13 | 姚长水 | Range energy-saving method of common reciprocating piston engine |
DE102013223926B4 (en) | 2013-11-22 | 2018-02-08 | Schaeffler Technologies AG & Co. KG | Hydraulic valve brake for a hydraulically variable valve train and method for adjusting the hydraulic valve brake |
DE102014007536B4 (en) * | 2014-05-16 | 2016-02-25 | Audi Ag | Internal combustion engine with a valve train |
JP6951847B2 (en) * | 2016-03-18 | 2021-10-20 | 日東電工株式会社 | An optical member, and a backlight unit and a liquid crystal display device using the optical member. |
AT518408B1 (en) * | 2016-04-05 | 2017-10-15 | Avl List Gmbh | VALVE CONTROL DEVICE FOR AT LEAST ONE GAS CHANGING VALVE |
KR102084908B1 (en) * | 2017-03-17 | 2020-03-04 | 바르실라 핀랜드 오이 | Operation method of control device for gas exchange valve of internal combustion piston engine and control device for gas exchange valve of internal combustion engine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4164917A (en) * | 1977-08-16 | 1979-08-21 | Cummins Engine Company, Inc. | Controllable valve tappet for use with dual ramp cam |
DE2840445C2 (en) * | 1978-09-16 | 1984-10-04 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg | Hydraulic device for operating a gas exchange valve for internal combustion engines |
DE3347680A1 (en) * | 1983-12-31 | 1984-08-30 | Ernst 8450 Amberg Haubner | Valve timing system for internal combustion engines with two different valve timings |
DE4111610C2 (en) | 1990-07-27 | 1998-07-30 | Audi Ag | Device for changing the timing of a gas exchange valve |
US5158048A (en) * | 1992-04-02 | 1992-10-27 | Siemens Automotive L.P. | Lost motion actuator |
EP0593908B1 (en) * | 1992-10-20 | 1995-09-27 | Steyr Nutzfahrzeuge Ag | Engine brake with exhaust throttle |
RU2038491C1 (en) * | 1993-05-19 | 1995-06-27 | Акционерное общество "ПМЗ "Восход" | Hydraulic plunger |
DE19653459A1 (en) * | 1996-12-20 | 1998-06-25 | Schaeffler Waelzlager Ohg | Tappet for a valve train of an internal combustion engine |
ATE263309T1 (en) * | 2001-02-21 | 2004-04-15 | Ge Jenbacher Gmbh & Co Ohg | VALVE DRIVE FOR AN INTERNAL COMBUSTION ENGINE |
JP2004084626A (en) * | 2002-08-28 | 2004-03-18 | Nippon Piston Ring Co Ltd | Valve mechanism |
CN100510352C (en) * | 2005-02-11 | 2009-07-08 | 沃尔沃拉斯特瓦格纳公司 | Device for internal-combustion engine |
BRPI0620594A2 (en) * | 2005-12-28 | 2011-11-16 | Jacobs Vehicle Systems Inc | Part-cycle bleed brake method and system |
FI124107B (en) * | 2006-06-30 | 2014-03-14 | Wärtsilä Finland Oy | Piston Engine Gas Exchange Valve Control Arrangement and Method for Controlling a Piston Engine Gas Exchange Valve |
-
2008
- 2008-07-31 FI FI20085756A patent/FI124120B/en active IP Right Grant
-
2009
- 2009-07-15 CN CN200980129423.0A patent/CN102105657B/en active Active
- 2009-07-15 KR KR1020117001490A patent/KR101545768B1/en active IP Right Grant
- 2009-07-15 RU RU2011107190/06A patent/RU2509219C2/en active
- 2009-07-15 JP JP2011520534A patent/JP5393784B2/en active Active
- 2009-07-15 WO PCT/FI2009/050626 patent/WO2010012864A1/en active Application Filing
- 2009-07-15 EP EP09784154.8A patent/EP2315919B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010012864A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI124120B (en) | 2014-03-31 |
KR20110044977A (en) | 2011-05-03 |
FI20085756A (en) | 2010-02-01 |
JP5393784B2 (en) | 2014-01-22 |
RU2011107190A (en) | 2012-09-10 |
WO2010012864A1 (en) | 2010-02-04 |
CN102105657A (en) | 2011-06-22 |
JP2011529546A (en) | 2011-12-08 |
KR101545768B1 (en) | 2015-08-19 |
RU2509219C2 (en) | 2014-03-10 |
CN102105657B (en) | 2014-03-12 |
EP2315919B1 (en) | 2016-08-24 |
FI20085756A0 (en) | 2008-07-31 |
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