EP2173977A1 - Valve train actuating device - Google Patents
Valve train actuating deviceInfo
- Publication number
- EP2173977A1 EP2173977A1 EP08801530A EP08801530A EP2173977A1 EP 2173977 A1 EP2173977 A1 EP 2173977A1 EP 08801530 A EP08801530 A EP 08801530A EP 08801530 A EP08801530 A EP 08801530A EP 2173977 A1 EP2173977 A1 EP 2173977A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gas exchange
- exchange valve
- crankshaft
- actuating device
- decompression
- 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
- 230000006837 decompression Effects 0.000 claims abstract description 34
- 238000010304 firing Methods 0.000 claims abstract description 24
- 238000002485 combustion reaction Methods 0.000 claims abstract description 8
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010363 phase shift Effects 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
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
- F01L13/065—Compression release engine retarders of the "Jacobs Manufacturing" type
-
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0273—Multiple actuations of a valve within an engine cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
Definitions
- the invention relates to a gas exchange valve actuating device according to the preamble of claim 1.
- the invention has for its object to provide a decompression brake device with a maximum braking power in different operating conditions.
- the object is achieved in each case by the features of patent claim 1, wherein further embodiments of the invention can be taken from the subclaims.
- the invention is based on a gas exchange valve actuating device, in particular for an internal combustion engine, with at least one firing camshaft which is phase-adjustable by means of a firing camshaft adjusting device to a crankshaft, and with a decompression brake device comprising at least one brake cam and at least one Dekompressionsgas monventil.
- the gas exchange valve actuating device comprises an adjusting device which is provided to set a Dekompressionsgas crispventilbe- actuating time.
- a “decompression gas exchange valve actuation time” should in particular be understood to mean a time that is related to the crankshaft, in particular a phase time point related to the crankshaft, at which the decompression gas exchange valve is actuated by the decompression brake device. and in particular is opened, the Dekompressionsgas grillventi! can be made in one piece or in several parts with a gas outlet.
- “provided” is meant in particular specially equipped, designed and / or programmed
- the brake cam is arranged on the firing camshaft.
- a decompression brake device with an adjustable gas exchange valve actuation time which can be produced in a particularly simple and cost-effective manner.
- an arrangement of the brake cam on a brake camshaft is conceivable.
- the decompression gas exchange valve actuation timing at which the brake cam disposed on the firing camshaft actuates the decompression gas exchange valve can be set particularly easily.
- the adjusting device is at least partially designed in one piece with the Befashionungsnockenwellenverstellvorraum. As a result, material, components and costs can be saved and the decompression brake can be made very compact.
- a control unit provided to set the decompressing gas change valve actuation timing is proposed.
- the decompression brake device can be adapted particularly flexibly to different operating conditions.
- control unit is provided to set the Dekompressionsgaswech- selventilbetuschists time in dependence on a speed of the crankshaft.
- a braking power adapted to the operating state can be set.
- Dependence on further or alternative parameters that appear reasonable to a person skilled in the art, for example as a function of a loading state or a driver's request.
- the brake camshaft actuation time is shifted in the direction of a top dead center with a decreasing rotational speed of the crankshaft.
- a “top dead center” should be understood in particular a position of the crankshaft, in which a direction of movement of a piston attached to the crankshaft is changed or a position of the piston at which a compression of a gas enclosed in a cylinder by the piston is maximum.
- FIG. 1 shows a gas exchange valve actuating device in the closed state
- FIG. 2 shows a gas exchange valve actuating device in the open state at a top dead center of a crankshaft.
- FIG. 1 shows a cross section through a gas exchange valve actuating device for an internal combustion engine with a firing camshaft 10, which is phase-adjustable by means of a firing camshaft adjusting device 11 to a crankshaft 12.
- a decompression brake device 13 is arranged, which comprises a brake cam 14 and a decompression gas exchange valve 15.
- the gas exchange valve actuating device comprises an adjusting device 16, by means of which a decompression device gas exchange valve timing at which the Dekompressionsgas monventi! 13 is opened, can be adjusted.
- the brake cam 14 of the decompression brake device 13 is disposed on the firing camshaft 10. Via a brake cam follower 17, which is arranged on a brake rocker arm 18, the brake cam 14 is connected to the brake rocker arm 18.
- the brake cam follower 17 follows the movement of the brake cam 14, whereby the brake rocker arm 18 performs a pivoting movement.
- the brake rocker arm 18 is connected via a suitable device 27 with the decompression gas exchange valve 15 and the decompression gas exchange valve 15 is opened by the pivoting movement of the brake rocker arm 18 ( Figure 2).
- rocker arm 26 About another rocker arm 26 is the Dekompressionsgas grillventi! 15, which also forms an exhaust gas outlet valve for a firing operation, connected to an exhaust cam 19.
- the rocker arm 26 follows the movements of the exhaust cam 19 via a cam follower 25.
- the gas 24 enclosed in a cylinder 20 is compressed by a movement of a piston 21 and a pressure is built up.
- a maximum built-up pressure of the gas 24 enclosed in the cylinder 20, which is reached when the decompression gas exchange valve 15 remains closed, increases in particular with an increasing rotational speed of the crankshaft 12.
- the rotational speed of the crankshaft 12 corresponds in particular to a rotational speed of the internal combustion engine.
- An energy that is expended to compress the gas 24 depends, in particular, on the pressure built up in the cylinder 20. By opening the decompression gas exchange valve 15, the energy expended is dissipated in particular as heat energy and a braking effect is created.
- a decompression gas exchange valve actuation time is set via a phase angle between the crankshaft 12 and the firing camshaft 10 at which the decompression gas exchange valve 15 is opened.
- the pressure built up in the cylinder 20 is always less than or equal to a maximum allowable cylinder pressure.
- the firing camshaft 10 is rotated by the adjusting device 16 against the crankshaft 12.
- the pressure in the cylinder 20 is built up faster than at a low speed. Since the built-up pressure at a high speed is greater than at a low speed, especially at a high speed of the pressure built up in the cylinder 20 may exceed the maximum allowable cylinder pressure. To avoid this, the decompression gas exchange valve 15 is opened before reaching a top dead center 23, especially at a high speed.
- the control unit 22 shifts the decompression gas exchange valve timing with decreasing speed in the direction of top dead center 23.
- the maximum pressure built up of the gas 24 enclosed in the cylinder 20 remains below the maximum allowable cylinder pressure.
- the decompression gas exchange valve 15 is then opened at top dead center 23 when the pressure built up in the cylinder 20 reaches a maximum and maximum braking power can be achieved. In principle, however, the decompression gas exchange valve 15 can also be opened at an earlier point in time if a small braking power is sufficient.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007038078A DE102007038078A1 (en) | 2007-08-11 | 2007-08-11 | Gas exchange valve actuating device |
PCT/EP2008/006487 WO2009021666A1 (en) | 2007-08-11 | 2008-08-07 | Valve train actuating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2173977A1 true EP2173977A1 (en) | 2010-04-14 |
EP2173977B1 EP2173977B1 (en) | 2017-03-01 |
Family
ID=39967673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08801530.0A Active EP2173977B1 (en) | 2007-08-11 | 2008-08-07 | Valve train actuating device |
Country Status (7)
Country | Link |
---|---|
US (1) | US8230837B2 (en) |
EP (1) | EP2173977B1 (en) |
JP (1) | JP5335792B2 (en) |
CN (1) | CN101784758B (en) |
DE (1) | DE102007038078A1 (en) |
RU (1) | RU2445472C2 (en) |
WO (1) | WO2009021666A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7712449B1 (en) * | 2009-05-06 | 2010-05-11 | Jacobs Vehicle Systems, Inc. | Lost motion variable valve actuation system for engine braking and early exhaust opening |
FR2988771B1 (en) * | 2012-04-02 | 2014-04-25 | Peugeot Citroen Automobiles Sa | DEVICE FOR PARTIALLY DEACTIVATING THE CYLINDERS OF AN INTERNAL COMBUSTION ENGINE |
CN103334808B (en) * | 2013-06-03 | 2016-08-10 | 浙江亿日气动科技有限公司 | Electric engine brake device |
DE102015016526A1 (en) | 2015-12-19 | 2017-06-22 | Daimler Ag | Method for operating a reciprocating internal combustion engine |
SE540139C2 (en) | 2016-07-11 | 2018-04-10 | Scania Cv Ab | Method of changing gear ratio in a gearbox of a vehicle |
US10859007B2 (en) | 2016-10-06 | 2020-12-08 | Volvo Truck Corporation | Internal combustion engine and a method for controlling a braking torque of the engine |
EP3548716A4 (en) | 2016-11-30 | 2020-11-18 | Cummins Inc. | Compression release valvetrain design |
DE102016015457A1 (en) | 2016-12-22 | 2018-06-28 | Daimler Ag | Method for operating a reciprocating internal combustion engine |
DE102017201343A1 (en) | 2017-01-27 | 2018-08-02 | Mahle International Gmbh | Valve gear for a reciprocating internal combustion engine and method for valve control in a reciprocating internal combustion engine |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB112644A (en) * | 1916-11-18 | 1918-01-18 | Harold Wade | Improved Method of and Means for Braking Explosion Motors. |
SE470363B (en) * | 1992-06-17 | 1994-01-31 | Volvo Ab | Method and device for engine braking with a multi-cylinder internal combustion engine |
RU2011853C1 (en) * | 1992-07-16 | 1994-04-30 | Общество с ограниченной ответственностью "АТОСС" | Gas distributing mechanism for four-stroke internal combustion engine |
JPH0687356A (en) * | 1992-09-09 | 1994-03-29 | Toyota Motor Corp | Engine brake force automatic control device |
DE19526463C2 (en) * | 1995-07-20 | 1998-07-09 | Daimler Benz Ag | Engine braking device for an internal combustion engine |
US6125828A (en) * | 1995-08-08 | 2000-10-03 | Diesel Engine Retarders, Inc. | Internal combustion engine with combined cam and electro-hydraulic engine valve control |
RU2126892C1 (en) * | 1997-06-02 | 1999-02-27 | Щетинин Михаил Николаевич | Method of active control of gas distribution in internal combustion engine and camshaft for its realization |
DE19733322A1 (en) * | 1997-08-01 | 1999-02-04 | Mwp Mahle J Wizemann Pleuco Gm | Valve control of an internal combustion engine that can be switched as a drive or brake |
US6510824B2 (en) * | 1997-12-11 | 2003-01-28 | Diesel Engine Retarders, Inc. | Variable lost motion valve actuator and method |
DE60028951T2 (en) * | 1999-04-14 | 2006-10-12 | Jacobs Vehicle Systems Inc., Bloomfield | LEVER ARRANGEMENT FOR GAS INLET AND OUTLET VALVES FOR CHANGING THE VALVE CROP AND PARTS FOR POSITIVE PERFORMANCE |
US6422186B1 (en) * | 1999-09-10 | 2002-07-23 | Diesel Engine Retarders, Inc. | Lost motion rocker arm system with integrated compression brake |
US6386160B1 (en) * | 1999-12-22 | 2002-05-14 | Jenara Enterprises, Ltd. | Valve control apparatus with reset |
US20020104509A1 (en) * | 2001-02-05 | 2002-08-08 | Sameer Bhargava | Variable valve timing of an engine compression brake |
JP2003120376A (en) * | 2001-10-05 | 2003-04-23 | Mitsubishi Motors Corp | Catalyst heat deterioration suppression device |
JP2003127706A (en) * | 2001-10-29 | 2003-05-08 | Nissan Motor Co Ltd | Traveling control system for vehicle and vehicle quipped with the same |
US7252054B2 (en) * | 2002-05-14 | 2007-08-07 | Caterpillar Inc | Combustion engine including cam phase-shifting |
WO2004081352A1 (en) * | 2003-03-06 | 2004-09-23 | Jenara Enterprises Ltd. | Modal variable valve actuation system for internal combustion engine and method for operating the same |
US6997150B2 (en) * | 2003-11-17 | 2006-02-14 | Borgwarner Inc. | CTA phaser with proportional oil pressure for actuation at engine condition with low cam torsionals |
DE10359068A1 (en) * | 2003-12-16 | 2005-07-21 | Ina-Schaeffler Kg | Internal combustion engine with a hydraulic device for adjusting the rotational angle of a camshaft relative to a crankshaft |
US7464675B1 (en) * | 2006-11-01 | 2008-12-16 | Michael Moses Schechter | Operating an air-hybrid vehicle with camshaft-driven engine valves |
-
2007
- 2007-08-11 DE DE102007038078A patent/DE102007038078A1/en not_active Withdrawn
-
2008
- 2008-08-07 WO PCT/EP2008/006487 patent/WO2009021666A1/en active Application Filing
- 2008-08-07 EP EP08801530.0A patent/EP2173977B1/en active Active
- 2008-08-07 CN CN200880103201.7A patent/CN101784758B/en active Active
- 2008-08-07 JP JP2010520461A patent/JP5335792B2/en active Active
- 2008-08-07 RU RU2010108417/06A patent/RU2445472C2/en not_active IP Right Cessation
-
2010
- 2010-02-08 US US12/658,585 patent/US8230837B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009021666A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20100180860A1 (en) | 2010-07-22 |
DE102007038078A1 (en) | 2009-02-12 |
WO2009021666A1 (en) | 2009-02-19 |
CN101784758A (en) | 2010-07-21 |
US8230837B2 (en) | 2012-07-31 |
JP5335792B2 (en) | 2013-11-06 |
CN101784758B (en) | 2012-07-04 |
RU2445472C2 (en) | 2012-03-20 |
JP2010535981A (en) | 2010-11-25 |
EP2173977B1 (en) | 2017-03-01 |
RU2010108417A (en) | 2011-09-20 |
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