EP2935844A1 - Method for operating an internal combustion engine with variable valve control and exhaust-gas recirculation - Google Patents
Method for operating an internal combustion engine with variable valve control and exhaust-gas recirculationInfo
- Publication number
- EP2935844A1 EP2935844A1 EP13796041.5A EP13796041A EP2935844A1 EP 2935844 A1 EP2935844 A1 EP 2935844A1 EP 13796041 A EP13796041 A EP 13796041A EP 2935844 A1 EP2935844 A1 EP 2935844A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- gas recirculation
- egr
- combustion engine
- exhaust gas
- 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.)
- Ceased
Links
Classifications
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
-
- 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
- F02D13/0223—Variable control of the intake valves only
- F02D13/0234—Variable control of the intake valves only changing the valve timing only
-
- 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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
- F02D41/0052—Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
-
- 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
- Y02T10/40—Engine management systems
Definitions
- the invention relates to a method for operating an internal combustion engine, in particular a diesel engine or gasoline engine, in particular of a motor vehicle, with an external exhaust gas recirculation (EGR), wherein a closing time of intake valves of the internal combustion engine is changed, according to the preamble of patent claim 1.
- EGR exhaust gas recirculation
- the exhaust gas recirculation is one of the essential elements of the internal engine NO x reduction in a
- Gas exchange valve timing realized by means of an additional opening s of inlet or outlet or a negative valve overlap via a variable valve train.
- Advantageous over the external EGR are the short distances and the fast response times as well as the direct metering.
- the disadvantage is the lack of effective cooling of the residual gas, as in the external feedback. For this reason, it is often suggested to provide a (basic) amount of EGR to the engine via the external, cooled EGR circuit and to increase or decrease a lower proportion of internal EGR for adjusting the air ratio during load transients.
- Exhaust gas recirculation rate can be reduced.
- Valve timing of intake and exhaust valves of an internal combustion engine is known, wherein an intake valve closing timing is controlled such that a desired intake air amount and a desired amount of internal exhaust gas recirculation for a cylinder charge is achieved.
- the invention is based on the object, an output of unwanted
- Exhaust gas recirculation is controlled with an actuator for the external exhaust gas recirculation such that at least one parameter of the exhaust gas recirculation remains constant.
- a further improvement of the soot and NO x reduction is achieved in that the at least one constant held parameter of the exhaust gas recirculation is an EGR rate and / or an EGR mass of a cylinder charge.
- the actuator for the external exhaust gas recirculation is an AGR actuator, in particular an exhaust valve, an EGR valve or a combination door, or two actuators, in particular an EGR valve with throttle in an intake tract or an exhaust tract of the internal combustion engine, comprising.
- Closing timing of the intake valves is shifted so late in a time after a bottom dead center before a compression stroke that a total charge is reduced.
- a particularly high effect of the emission reduction is achieved in that the closing time of the intake valves is shifted by 10 to 100 KW, in particular 30 ° to 35 KW, to the bottom dead center in the compression stroke.
- an internal combustion engine having a control unit with a computer is particularly suitable.
- the computer has a memory in which a program is stored is. When at least one subsection of the program is executed, the
- Fig. 2 is a graph of emission of soot particles PM 1 PG R in
- Fig. 3 is a graphical representation of an emission of nitrogen oxides NO x in
- FIG. 4 shows a graph of a specific fuel consumption in g / kWh b e ff as a function of a closing time of intake valves at a specific operating point of the internal combustion engine for various parameters held constant.
- FIG. 1 The embodiment of the internal combustion engine shown schematically in FIG. 1 comprises an exhaust gas turbocharger 10 with a turbine 12 and a compressor 14, a
- Intercooler 16 a suction pipe 18, working cylinder 20 with two inlet valves 22 and two exhaust valves 24, wherein only one working cylinder 20 is exemplified, and an exhaust manifold 26, in which the exhaust gas from the exhaust valves 24 flows.
- EGR exhaust gas recirculation
- the following mass flows or masses contribute to a cylinder charge m z : an air mass m L 30, an inlet mass m E z 32, a control quantity mass m S price amount 34, a fuel mass m r 36 and a mass of externally recirculated exhaust gas m A GR 38.
- the control amount of mass m S t e uermenge 34 is controlled by the closing timing of the Inlet valves 22 determined. Close this late, so a part of the cylinder charge is pushed out again in the compression stroke, thereby reducing the cylinder charge m z .
- an EGR rate and / or an EGR mass to keep constant.
- the regulation of the EGR parameter is thus not carried out by the opening or
- Closing time of the intake valves 22 is a soot and NOX emission of
- a first graph 61 illustrates a profile of the respective emission value PM LPEG R, NO x or b eff over the closing time 50 of the intake valves 22 for a constant air mass, ie with the displacement of the
- a second graph 62 illustrates a profile of the respective emission value PM LP EGR, NO x or b eff over the closing time 50 of the inlet valves 22 for a constant EGR rate, ie with the displacement of the
- a third graph 63 respectively illustrates a course of the respective emission value PM 1 PEGR , NO x and b e fi over the closing time 50 of the inlet valves 22 for a constant EGR mass, ie with the displacement of the
- a fourth graph 64 illustrates a course of the respective emission value PM L PEGR, NO x or b etf over the closing time 50 of the intake valves 22 for a constant total mass of the cylinder charge, ie with the shifting of the closing time to late the boost pressure is raised. This corresponds to an operating procedure according to the so-called "Miller cycle".
- Figs. 2 to 4 show a predetermined operating point "2000/90" of
- vertical axis emission of soot particles PM L PEGR in grams per hour [g / h]
- vertical axis emission of nitrogen oxides NO x in grams per kilowatt hour [g / kWh]
- first graph curve of the respective emission value PM L PEGR, NO x or b eff over the closing time 50 of the inlet valves 22 for a constant air mass
- second graph curve of the respective emission value PM L PEGR, NO x or b e ff over the closing time 50
- the EGR rate constant inlet valve 22 third graph: the curve of the respective emission value PM L PEGR, NO x and b eff over the closing time 50 of the inlet valves 22 for a constant EGR mass
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012024927.6A DE102012024927A1 (en) | 2012-12-19 | 2012-12-19 | Method for operating an internal combustion engine |
PCT/EP2013/074569 WO2014095234A1 (en) | 2012-12-19 | 2013-11-25 | Method for operating an internal combustion engine with variable valve control and exhaust-gas recirculation |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2935844A1 true EP2935844A1 (en) | 2015-10-28 |
Family
ID=49674285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13796041.5A Ceased EP2935844A1 (en) | 2012-12-19 | 2013-11-25 | Method for operating an internal combustion engine with variable valve control and exhaust-gas recirculation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2935844A1 (en) |
DE (1) | DE102012024927A1 (en) |
WO (1) | WO2014095234A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016002233A1 (en) | 2016-02-25 | 2017-08-31 | Karlheinrich Winkelmann | Method for operating an internal combustion engine with a mixed fuel |
JP7073843B2 (en) * | 2018-03-28 | 2022-05-24 | トヨタ自動車株式会社 | Internal combustion engine control device |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5203311A (en) * | 1990-11-06 | 1993-04-20 | Mazda Motor Corporation | Exhaust gas recirculation system for an internal combustion engine |
DE4232044C2 (en) * | 1991-09-26 | 1998-01-29 | Mazda Motor | Internal combustion engine with spark ignition |
EP1104844B1 (en) | 1999-12-03 | 2006-10-04 | Nissan Motor Co., Ltd. | Valve timing control for engine |
JP4144251B2 (en) * | 2002-05-09 | 2008-09-03 | トヨタ自動車株式会社 | Control of exhaust gas recirculation in internal combustion engines. |
AT7207U1 (en) | 2002-10-22 | 2004-11-25 | Avl List Gmbh | METHOD FOR OPERATING A DIRECTLY INJECTING DIESEL INTERNAL COMBUSTION ENGINE |
DE102005012306A1 (en) | 2005-03-17 | 2006-09-28 | Daimlerchrysler Ag | Method for operating an internal combustion engine and internal combustion engine for this purpose |
US7480558B2 (en) * | 2007-02-28 | 2009-01-20 | Gm Global Technology Operations, Inc. | Method and apparatus for controlling a homogeneous charge compression ignition engine |
WO2010125696A1 (en) * | 2009-05-01 | 2010-11-04 | トヨタ自動車株式会社 | Spark‑ignited internal combustion engine |
DE102010056514A1 (en) * | 2010-12-31 | 2012-07-05 | Fev Gmbh | Method for reduction of nitrogen oxide emission in diesel engine of motor car, involves providing parts of exhaust gas to form residue exhaust gas in chamber, and adjusting residue gas and/or ratio between parts of gas in chamber |
JP5929015B2 (en) * | 2011-06-06 | 2016-06-01 | 日産自動車株式会社 | Exhaust gas recirculation device for internal combustion engine |
-
2012
- 2012-12-19 DE DE102012024927.6A patent/DE102012024927A1/en not_active Withdrawn
-
2013
- 2013-11-25 EP EP13796041.5A patent/EP2935844A1/en not_active Ceased
- 2013-11-25 WO PCT/EP2013/074569 patent/WO2014095234A1/en active Application Filing
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2014095234A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2014095234A1 (en) | 2014-06-26 |
DE102012024927A1 (en) | 2014-06-26 |
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Effective date: 20200813 |