WO2016016206A1 - Vcr control and miller cycle for a reciprocating piston internal combustion engine - Google Patents
Vcr control and miller cycle for a reciprocating piston internal combustion engine Download PDFInfo
- Publication number
- WO2016016206A1 WO2016016206A1 PCT/EP2015/067194 EP2015067194W WO2016016206A1 WO 2016016206 A1 WO2016016206 A1 WO 2016016206A1 EP 2015067194 W EP2015067194 W EP 2015067194W WO 2016016206 A1 WO2016016206 A1 WO 2016016206A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- internal combustion
- combustion engine
- compression ratio
- reciprocating internal
- engine
- Prior art date
Links
Classifications
-
- 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
- F02D13/0269—Controlling the valves to perform a Miller-Atkinson cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3064—Controlling fuel injection according to or using specific or several modes of combustion with special control during transition between modes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/32—Miller cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D2041/001—Controlling intake air for engines with variable valve actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2700/00—Mechanical control of speed or power of a single cylinder piston engine
- F02D2700/03—Controlling by changing the compression ratio
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a method for controlling a reciprocating internal combustion engine with variable compression ratio, an engine control unit, a reciprocating internal combustion engine, a vehicle and a computer program product.
- the object of the present invention is to provide an improved variant.
- a method for controlling a variable compression ratio reciprocating internal combustion engine comprising a switching strategy between a 4-stroke engine or diesel engine cycle and a Miller process, i. H . an operating state of the reciprocating piston internal combustion engine, in which the intake valves close at another time, ie before or after the closing time of the otto- or diesel engine 4-stroke process, wherein the control comprises at least one of the following steps:
- the invention proposes a method for controlling a reciprocating piston internal combustion engine with adjustable compression ratio, wherein the operation of the reciprocating internal combustion engine is switched between a otto- or diesel engine 4-stroke process and a Miller process when the compression ratio is changed or after a change, the reciprocating internal combustion engine, a new compression ratio, namely a higher or lower than previously occupies.
- the switchover is carried out according to the following strategy:
- the reciprocating internal combustion engine is thus operated in different ways as a function of a change in the compression ratio.
- the reciprocating internal combustion engine operates according to an advantageous embodiment of the invention in the otto- or diesel engine 4-stroke process.
- the compression ratio is raised or raised to the highest possible compression ratio, it is switched to reduce the tendency to knock on the Miller process according to the invention. This can basically be done before, during or after the compression ratio has been increased.
- the reciprocating internal combustion engine continues to operate in the Miller process. Only when the compression ratio is reduced again or reduced to the lowest possible compression ratio, switching the operating mode of the reciprocating internal combustion engine from Miller process takes place in the otto- or diesel engine 4-stroke process. Again, this switching can occur before, during or after the change in the compression ratio, but it is expedient to first lower the compression ratio in the operated in the Miller process reciprocating internal combustion engine and only then by the Miller process on the otto- or diesel engine 4-stroke process to change.
- the reciprocating internal combustion engine is operated in the region of low compression ratios in a four-cycle or four-cycle process, wherein no pressure limitation takes place.
- the Miller process is switched. Thereby, the closing timing of the intake is shifted to "early” or “late”, whereby the charge mass is reduced and thus the pressure and the tendency to knock in the cylinder are reduced.
- the controller does not become one pressure-limited electric motor or diesel engine switched 4-stroke process.
- a reduction of the compression ratio takes place before an operation of the reciprocating internal combustion engine is switched in the Miller process path.
- an engine control unit of a variable compression ratio reciprocating internal combustion engine having a controller is proposed by one of the methods described above.
- variable compression ratio reciprocating internal combustion engine comprising an engine control unit by means of which one of the above methods is carried out as described above.
- the reciprocating internal combustion engine preferably has an eccentric shaft which rotates with the crankshaft so that it adjusts a VCR adjustment.
- the eccentric shaft rotates at half the frequency of the crankshaft.
- the eccentric shaft allows a continuous adjustment of the compression.
- a vehicle having a reciprocating internal combustion engine which is operated by a method as described above.
- a computer program product with program code means for carrying out all method steps according to the above description is proposed when the computer program product is executed in an engine control unit.
- Show: 1 is a pV diagram of a Miller process
- Fig. 2 is a pV diagram of a non-pressure limited process
- Fig. 1 is a pV diagram, pressure over volume, of a Miller process. It comes to an expansion and compression of the charge mass before ignition, see points 1-2-3.
- e M iiier denotes the compression ratio at the time when the inlet closes
- V M iiier the cylinder volume at this time.
- V 0T denotes the cylinder volume at top dead center
- VUT the cylinder volume at bottom dead center of the piston.
- e max denotes the maximum compression ratio.
- Fig. 2 is an idealized Otto engine or diesel engine 4-stroke process, as already described above, schematized in the pV diagram, which is executed without pressure limiting.
- the compression ratio is increased or in temporal relation to the Miller process, which preferably takes place before the compression ratio increase. If the compression ratio is then changed again to lower values, the Miller process (again) switches over to the otto- or diesel engine process, which preferably takes place after the reduction of the compression ratio.
- the compression ratio of a reciprocating internal combustion engine can be set simultaneously for all cylinders or for all cylinders of a cylinder bank or set for the individual cylinders of the reciprocating internal combustion engine, in all the cases mentioned above either actively or passively.
- the geometry of an engine component such as the connecting rod length, the crankshaft radius, the bearing of the crankshaft and / or the storage of the compression piston on the connecting rod and thus the effective connecting rod length is preferably changed. This is preferably done hydraulically, ie. using a medium.
- the motor oil is especially suitable as a medium.
- the active adjustment means that an adjustment of the relevant engine component is achieved by the action of external adjusting forces on the adjusting mechanism.
- the passive adjustment means that acting on the engine component during operation of the internal combustion engine forces such as the gas pressure forces and the inertial forces are utilized to effect an adjustment of the engine component.
- forces such as the gas pressure forces and the inertial forces
- the passive adjustment thus comes due to the use of these forces to an automatic adjustment of the engine component, while in the active adjustment from the outside, i. in addition to the aforementioned acting forces or independently of these still further adjusting forces are introduced.
- the invention can be described by one of the following feature groups: the feature groups can be combined with one another and also individual features of a feature group can be combined with one or more features of one or more other feature groups and / or one or more of the previously described embodiments are.
- Method for controlling a reciprocating internal combustion engine with adjustable compression ratio wherein
- the engine control unit for a variable compression ratio reciprocating internal combustion engine comprising a controller for controlling the reciprocating internal combustion engine according to a method of any one of items 1 to 3.
- a variable compression ratio reciprocating internal combustion engine comprises an engine control unit, by which a method according to any one of
- Numbers 1 to 3 is executable.
- Vehicle having a reciprocating internal combustion engine which can be operated by means of a method according to one of the numbers 1 to 3 or which has an engine control unit according to item 4 or a reciprocating internal combustion engine according to item 5.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112015003488.9T DE112015003488A5 (en) | 2014-07-29 | 2015-07-27 | VCR control and Miller process in a reciprocating internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014010972.0 | 2014-07-29 | ||
DE102014010972 | 2014-07-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016016206A1 true WO2016016206A1 (en) | 2016-02-04 |
Family
ID=53761371
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2015/067194 WO2016016206A1 (en) | 2014-07-29 | 2015-07-27 | Vcr control and miller cycle for a reciprocating piston internal combustion engine |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE112015003488A5 (en) |
WO (1) | WO2016016206A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1835152A1 (en) * | 2006-03-14 | 2007-09-19 | Nissan Motor Company Limited | Emission Reduction |
EP1911952A2 (en) * | 2006-10-11 | 2008-04-16 | Nissan Motor Co., Ltd. | Internal combustion engine |
US20100163001A1 (en) * | 2006-06-15 | 2010-07-01 | Toyota Jidosha Kabushiki Kaisha | Spark Ignition Type Internal Combustion Engine |
US20120312014A1 (en) * | 2011-06-10 | 2012-12-13 | Toyota Jidosha Kabushiki Kaisha | Spark ignition-type internal combustion engine |
-
2015
- 2015-07-27 DE DE112015003488.9T patent/DE112015003488A5/en not_active Withdrawn
- 2015-07-27 WO PCT/EP2015/067194 patent/WO2016016206A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1835152A1 (en) * | 2006-03-14 | 2007-09-19 | Nissan Motor Company Limited | Emission Reduction |
US20100163001A1 (en) * | 2006-06-15 | 2010-07-01 | Toyota Jidosha Kabushiki Kaisha | Spark Ignition Type Internal Combustion Engine |
EP1911952A2 (en) * | 2006-10-11 | 2008-04-16 | Nissan Motor Co., Ltd. | Internal combustion engine |
US20120312014A1 (en) * | 2011-06-10 | 2012-12-13 | Toyota Jidosha Kabushiki Kaisha | Spark ignition-type internal combustion engine |
Also Published As
Publication number | Publication date |
---|---|
DE112015003488A5 (en) | 2017-04-27 |
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