DE102014204447B4 - Engine operation method and motor vehicle - Google Patents

Engine operation method and motor vehicle

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Publication number
DE102014204447B4
DE102014204447B4 DE102014204447.2A DE102014204447A DE102014204447B4 DE 102014204447 B4 DE102014204447 B4 DE 102014204447B4 DE 102014204447 A DE102014204447 A DE 102014204447A DE 102014204447 B4 DE102014204447 B4 DE 102014204447B4
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DE
Germany
Prior art keywords
cylinder
mode
exhaust valve
load mode
standby cylinder
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.)
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Application number
DE102014204447.2A
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German (de)
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DE102014204447A1 (en
Inventor
Albert Breuer
Guohui Chen
Thomas Lorenz
Klaus Moritz Springer
Helmut Ruhland
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ford Global Technologies LLC
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Ford Global Technologies LLC
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Priority to DE102013214379.6 priority Critical
Priority to DE102013214379 priority
Application filed by Ford Global Technologies LLC filed Critical Ford Global Technologies LLC
Priority to DE102014204447.2A priority patent/DE102014204447B4/en
Publication of DE102014204447A1 publication Critical patent/DE102014204447A1/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D13/00Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/06Cutting-out cylinders
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D13/00Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223Variable control of the intake valves only
    • F02D13/0226Variable control of the intake valves only changing valve lift or valve lift and timing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D13/00Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0242Variable control of the exhaust valves only
    • F02D13/0246Variable control of the exhaust valves only changing valve lift or valve lift and timing
    • Y02T10/18

Abstract

An engine operating method (20) for operating a multi-cylinder reciprocating engine (11) configured to operate at least one of the cylinders as a standby cylinder (12) in either a load mode or a shutdown mode while at least another of the plurality of cylinders is operating in load mode wherein a cylinder operated in the load mode is fueled and a cylinder operated in the shutdown mode is not fueled, wherein at least the standby cylinder (12) is operated in the shutdown mode while at least one other of the plurality of cylinders is operated in the load mode characterized in that in the shutdown mode, an exhaust valve (14) of the standby cylinder (12) is opened with a smaller maximum stroke (28) than a maximum stroke (26), with the exhaust valve (14) of the standby cylinder (12) is opened in the load mode, while a Inlet valve (13) of the standby cylinder (12) in Shutdown mode remains closed.

Description

  • The present invention relates to an engine operating method for operating a multi-cylinder reciprocating engine having a cylinder deactivation. In addition, the present invention relates to a motor vehicle which is designed to exercise the engine operating method.
  • In reciprocating engines with multiple cylinders, it is known to operate a so-called cylinder shutdown to reduce fuel consumption and emissions. In this case, individual cylinders of the reciprocating engine are switched off in that they are not supplied with fuel.
  • The DE 10 2005 010 673 A1 shows a method for operating a multi-cylinder internal combustion engine, by means of which, starting from an idle, a considerably shortened response of an internal combustion engine to a load request is to be ensured. For this purpose, during idle operation in a multi-cylinder internal combustion engine, a first group of cylinders is fired and a second group of cylinders operated unfired. The valve drive may be partially or fully variable, with variable timing and / or variable valve lifts for inlet and / or outlet valve, be formed. A fully variable valve train is used, which is variable both in terms of timing and in terms of its valve lift.
  • Also the US 5 271 229 A deals with the solution of the improved response and discloses a method and a corresponding device. The method of operating an engine having a plurality of combustion chambers, an intake passage and an exhaust passage for each of the combustion chambers, a turbocharger with a compressor of a turbine and a certain pressure level, a reciprocating piston in each of the combustion chambers comprises the steps Monitoring the operating condition of the engine, outputting a control signal to an inlet means and an outlet means, actuating each of the inlet means and the outlet means independently in response to a control signal, actuating the inlet means of a selected subset of the combustors during each inlet and expansion stroke to allow flow of air into the combustion chambers, and actuating the exhaust means of the selected subset of combustors during each compression and exhaust stroke to increase the flow of air through the turbine and increase the boost pressure level.
  • The DE 33 16 446 A1 relates to a four-cylinder internal combustion engine, with two cylinders operating at both light and high load during engine operating conditions, two other cylinders which are shut down during light engine load operating condition, a deactivated cylinder valve mechanism during the engine operating state with light load, and control means for driving the valve mechanism to supply the deactivated cylinder with an air amount during a valve opening period which is in the range of the bottom dead center position of the deactivated cylinder.
  • During a cylinder deactivation, the pistons continue to move in the cylinder. As a result of the movements of the piston, a pressure in the deactivated cylinder can arise, in particular at the bottom dead center of the piston, which pressure is lower than a pressure in the crankcase, if the valves are closed at this time. This pressure difference can lead to leaks and pull oil from the crankcase into the deactivated cylinder. This can result in undesirable operating conditions and increased emission levels in the further operation of the reciprocating engine.
  • The present invention has for its object to provide an engine operating method, with which the aforementioned disadvantages are eliminated and to provide a motor vehicle, which is designed to carry out the engine operating method.
  • This object is achieved with an engine operating method according to claim 1 and a motor vehicle according to claim 7. Advantageous developments of the invention are specified in the subclaims and described in the description.
  • In the engine operating method of the invention for operating a multi-cylinder reciprocating engine, at least one standby cylinder is operated in a shutdown mode while at least one other of the plurality of cylinders is operated in a load mode. The reciprocating engine is configured to operate at least one of the cylinders as a standby cylinder in either the load mode or the shutdown mode while simultaneously operating at least one other of the plurality of cylinders in the load mode. A cylinder operated in load mode is fueled and a cylinder operating in shutdown mode is not fueled. In the engine operation method of the present invention, an exhaust valve of the standby cylinder is opened with a smaller maximum stroke than a maximum stroke with which the exhaust valve of the standby cylinder is opened in the load mode while an intake valve of the standby cylinder remains closed in the shutdown mode.
  • This advantageously makes it possible to equalize the pressure in the deactivated standby cylinder and to prevent a negative pressure from building up in the standby cylinder in the shutdown mode relative to the crankcase of the reciprocating engine and resulting in leaks.
  • The smaller maximum stroke is sufficient for pressure equalization in the deactivated standby cylinder and for flushing with hot exhaust gases. At the same time, less work is done with the smaller maximum stroke and the efficiency of the reciprocating engine is improved.
  • Characterized in that the exhaust valve is opened, hot exhaust gases of the cylinder operated in the load mode can get into the disabled standby cylinder and heat it or prevent cooling of the standby cylinder.
  • In an advantageous embodiment of the engine operating method according to the invention, the maximum lift of the exhaust valve of the standby cylinder is in the shutdown mode 5 Percent to 15 percent of the maximum lift of the discharge valve of the standby cylinder in load mode.
  • The range between 5 percent to 15 percent of the maximum lift of the exhaust valve in load mode is particularly favorable.
  • In a further advantageous embodiment of the engine operating method according to the invention, the discharge valve of the standby cylinder is opened in the shutdown mode for a shorter opening duration than an opening duration for which the discharge valve of the standby cylinder is opened in the load mode. Specifically, the opening duration of the standby cylinder exhaust valve in the shutdown mode is 15 percent to 25 percent of the opening duration of the standby cylinder exhaust valve in the load mode.
  • The shorter opening time is sufficient for pressure equalization in the deactivated standby cylinder and for flushing with hot exhaust gases. At the same time, less work is done with the shorter opening time and the efficiency of the reciprocating engine is improved. The range between 15 percent to 25 percent of the opening duration of the exhaust valve in load mode is particularly favorable.
  • In a further advantageous embodiment of the engine operating method according to the invention, the exhaust valve of the standby cylinder is opened in the shutdown mode in such a way that the exhaust valve of the standby cylinder reaches its maximum stroke at a different crank angle than the crank angle at which the exhaust valve of the standby cylinder reaches its maximum stroke in the load mode. Specifically, the crank angle of the exhaust valve of the standby cylinder upon reaching the maximum stroke in the shutdown mode is 30 degrees to 90 degrees smaller than the crank angle of the exhaust valve of the standby cylinder upon reaching the maximum lift in the load mode.
  • Due to the shifted time of the opening of the pressure compensation can take place in particular near the bottom dead center of the piston in the standby cylinder. In this piston position, the expected negative pressure would be greatest. An opening of one of the valves is thus most effective at this point of the piston and the opening duration and the maximum stroke of the valve can be reduced thereby.
  • The motor vehicle according to the invention has a reciprocating piston engine comprising several cylinders. In this case, the reciprocating engine is configured to operate at least one of the cylinders as a standby cylinder in either a load mode or a shutdown mode while simultaneously operating at least one other of the plurality of cylinders in load mode, fueling a cylinder operated in load mode and powering off mode operated cylinder is not supplied with fuel. The reciprocating engine also has at least one inlet valve and one outlet valve per cylinder and the reciprocating engine is designed to carry out the engine operating method according to the invention.
  • Thus, a motor vehicle is provided, which is favored by the advantages of the engine operating method according to the invention.
  • Embodiments of the invention will be explained in more detail with reference to the drawings and the description below. Show it:
    • 1 a motor vehicle according to the invention; and
    • 2 an engine operating method according to the invention.
  • In the 1 is the motor vehicle according to the invention 10 sketched in an exemplary embodiment in a sectional view. The car 10 has according to the invention a reciprocating engine 11 with several cylinders on. In the embodiment shown, the motor vehicle has 10 via a transversely mounted in-line engine 11 with four cylinders. According to the invention, other configurations are also conceivable, for example a V arrangement of the cylinders. In each cylinder is as usual a piston 16 arranged. The piston 16 is over a connecting rod 19 with one in a crankcase 18 stored crankshaft 17 connected. Controlled respectively the reciprocating motor is regulated 11 from an engine control unit 15 ,
  • The reciprocating engine 11 According to the invention, each cylinder has at least one inlet valve 13 and an exhaust valve 14 on. The valves 13 . 14 are preferred by one with the crankshaft 17 controlled in operative connection camshaft, as it is widely used.
  • The reciprocating engine 11 is preferably a four-stroke engine. The reciprocating engine 11 is formed according to the invention, at least one of the cylinders as a standby cylinder 12 operate in either a load mode or a shutdown mode while simultaneously operating at least one other of the plurality of cylinders in load mode. Load mode here means that the cylinder operated in load mode is supplied with fuel in the corresponding power stroke. Shutdown mode here means that the cylinder operated in the shutdown mode is not supplied with fuel in the corresponding power stroke. Has the reciprocating engine 11 as a four-stroke engine via a port injection, the corresponding power stroke is the intake stroke, has the reciprocating engine 11 via a direct injection, the corresponding power stroke can also be the compression stroke.
  • The non-supply of cylinders with fuel is known as so-called cylinder deactivation. The reciprocating engine 11 has such a cylinder deactivation. The reciprocating engine 11 includes corresponding devices for performing the cylinder deactivation. For example, the camshaft of the reciprocating engine 11 be slidable, so the valves 13 . 14 depending on the modes with different cams in operative connection. It is also conceivable according to the invention that the valves 13 . 14 be controlled electro-hydraulically.
  • In conventional Zylinderabschaltsystemen remain the valves 13 . 14 completely closed in shutdown mode. By the movement of the piston 16 In the cylinder, this can result in a pressure in the cylinder, which is lower than the prevailing pressure in the crankcase 18 , This can cause leakage and oil from the crankcase 18 be pulled into the cylinder. In addition, a cylinder shutdown according to conventional manner can adversely affect the thermal situation of the reciprocating engine and cool down the cylinder located in the off mode unintentionally strong. The reciprocating piston engine according to the invention 11 prevents these phenomena in that it is formed, an engine operating method according to the invention 20 perform.
  • The engine operating method according to the invention 20 is to operate the reciprocating engine 11 suitable. According to the invention, the engine operating method 20 in shutdown mode an exhaust valve 14 of the standby cylinder 12 opened while an inlet valve 13 of the standby cylinder 1 ) remains closed in shutdown mode.
  • The engine operating method according to the invention 20 is in the 2 illustrated in an exemplary embodiment. A vertical axis of the diagram indicates a valve lift 21 in millimeters and a horizontal axis of the graph gives a crank angle 22 the crankshaft 17 in degrees.
  • In the engine operating method according to the invention 20 will at least be the standby cylinder 12 operated in the shutdown mode, while at least one other of the cylinders is operated in load mode. In the 2 are the valve lift curves 23 . 24 . 25 of the inlet valve 13 and the exhaust valve 14 of the standby cylinder 12 mapped in both modes. In load mode, the exhaust valve points 14 an exhaust valve lift stroke 23 and the intake valve has an intake valve lift course 24 on.
  • The outlet valve 14 reaches a Auslassventillastmaximalhub in load mode in the embodiment shown 26 between 7 mm and 8 mm at a crank angle 22 from about 240 degrees. The outlet valve 14 is here in a range of the crank angle 22 from about 120 degrees to about 400 degrees. The outlet valve 14 is thus opened in load mode via a crank angle change of about 280 degrees.
  • The inlet valve 13 reaches an intake valve load maximum lift in load mode in the embodiment shown 27 between 7 mm and 8 mm at a crank angle 22 from about 460 degrees. The inlet valve 13 is here in a range of the crank angle 22 from about 330 degrees to about 610 degrees. The inlet valve 13 is thus opened in load mode via a crank angle change of about 280 degrees.
  • In the embodiment of the engine operating method shown 20 becomes the exhaust valve 14 opened in shutdown mode. 2 shows a Auslassventilabschalthubverlauf 25 the exhaust valve 14 in shutdown mode. The outlet valve 14 In the shutdown mode, in the illustrated embodiment, reaches a maximum exhaust valve shutoff stroke 28 between 0.5 mm and 0.9 mm at a crank angle 22 from about 180 degrees. The outlet valve 14 is here in a range of the crank angle 22 open from about 150 degrees to about 210 degrees. The outlet valve 14 is thus opened in the shutdown mode via a crank angle change of about 60 degrees. Compared to the load mode here is the exhaust valve 14 opened in shutdown mode later, it opens shorter and it is less open.
  • LIST OF REFERENCE NUMBERS
  • 10
    motor vehicle
    11
    reciprocating engine
    12
    willingness cylinder
    13
    intake valve
    14
    outlet valve
    15
    Engine control unit
    16
    piston
    17
    crankshaft
    18
    crankcase
    19
    pleuel
    20
    Engine operating procedures
    21
    valve
    22
    crank angle
    23
    Auslassventillasthubverlauf
    24
    Einlassventillasthubverlauf
    25
    Auslassventilabschalthubverlauf
    26
    Auslassventillastmaximalhub
    27
    Einlassventillastmaximalhub
    28
    Auslassventilabschaltmaximalhub

Claims (7)

  1. An engine operating method (20) for operating a multi-cylinder reciprocating engine (11) configured to operate at least one of the cylinders as a standby cylinder (12) in either a load mode or a shutdown mode while at least another of the plurality of cylinders is operating in load mode is wherein a powered in the load mode cylinder with fuel is supplied and operated in the power-down cylinder is not supplied with fuel, in which at least the standby cylinder (12) is operated in the power-down mode, while at least one other of the plurality of cylinders is operated in a load mode, characterized characterized in that in the shutdown mode, an exhaust valve (14) of the standby cylinder (12) is opened with a smaller maximum stroke (28) than a maximum stroke (26), with the exhaust valve (14) of the standby cylinder (12) is opened in the load mode, while a Inlet valve (13) of the standby cylinder (12) i m shutdown mode remains closed.
  2. Engine operating method (20) according to Claim 1 wherein the maximum stroke (28) of the exhaust valve (14) of the standby cylinder (12) in shutdown mode is 5 percent to 15 percent of the maximum lift (26) of the valve (13, 14) of the standby cylinder (12) in load mode.
  3. Engine operating method (20) according to one of Claims 1 to 2 wherein the exhaust valve (14) of the standby cylinder (12) is opened in the off mode for a shorter opening duration than an opening period for which the exhaust valve (14) of the standby cylinder (12) is opened in the load mode.
  4. Engine operating method (20) according to Claim 3 wherein the opening duration of the exhaust valve (14) of the standby cylinder (12) in shutdown mode is 15 percent to 25 percent of the opening duration of the exhaust valve (14) of the standby cylinder (12) in load mode.
  5. Engine operating method (20) according to one of Claims 1 to 4 wherein the exhaust valve (14) of the standby cylinder (12) is opened in the shutdown mode such that the exhaust valve (14) of the standby cylinder (12) reaches its maximum lift (28) at a different crank angle (22) than the crank angle (22) in which the exhaust valve (14) of the standby cylinder (12) reaches its maximum lift (26) in load mode.
  6. Engine operating method (20) according to Claim 5 wherein the crank angle (22) of the exhaust valve (14) of the standby cylinder (12) is 30 degrees to 90 degrees smaller than the crank angle (22) of the exhaust valve (14) of the standby cylinder (12) upon reaching the maximum lift (28) in the shutdown mode Reaching the maximum lift (26) in load mode.
  7. A motor vehicle (10) comprising a multi-cylinder reciprocating engine (11) adapted to operate at least one of the cylinders as a standby cylinder (12) in either a load mode or a shutdown mode while simultaneously operating at least one other of the plurality of cylinders in load mode in which a cylinder operated in the load mode is supplied with fuel and a cylinder operated in shutdown mode is not supplied with fuel, wherein the reciprocating engine (11) has at least one inlet valve (13) and one outlet valve (14) per cylinder and the reciprocating motor (11) is configured to carry out the engine operating method (20) according to one of the preceding claims.
DE102014204447.2A 2013-07-23 2014-03-11 Engine operation method and motor vehicle Active DE102014204447B4 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE102013214379.6 2013-07-23
DE102013214379 2013-07-23
DE102014204447.2A DE102014204447B4 (en) 2013-07-23 2014-03-11 Engine operation method and motor vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014204447.2A DE102014204447B4 (en) 2013-07-23 2014-03-11 Engine operation method and motor vehicle

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DE102014204447A1 DE102014204447A1 (en) 2015-01-29
DE102014204447B4 true DE102014204447B4 (en) 2019-03-07

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DE (1) DE102014204447B4 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015013785A1 (en) * 2015-10-20 2017-04-20 Andreas Stihl Ag & Co. Kg Two-stroke engine and series of two-stroke engines
DE102016110208A1 (en) * 2016-06-02 2017-12-07 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Method for operating an internal combustion engine with a cylinder deactivation
DE102017220294A1 (en) 2017-11-14 2019-05-16 Volkswagen Aktiengesellschaft Method for operating an internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3316446A1 (en) 1982-05-07 1983-11-10 Nissan Motor Four cylinder combustion engine
US5271229A (en) 1992-06-01 1993-12-21 Caterpillar Inc. Method and apparatus to improve a turbocharged engine transient response
DE102005010673A1 (en) 2005-03-09 2006-09-14 Bayerische Motoren Werke Ag Multi-cylinder internal combustion engine operating method for motor vehicle, involves adjusting preset ideal running moment by operating cylinders groups with drive moment that increases/decreases in comparison to ideal running moment

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4483759B2 (en) * 2005-10-12 2010-06-16 トヨタ自動車株式会社 Control device for internal combustion engine
JP4618239B2 (en) * 2006-12-11 2011-01-26 トヨタ自動車株式会社 Control device for internal combustion engine
CN101571075B (en) * 2008-07-31 2010-12-08 侯贺 General multi-operating mode energy-saving system
US8972156B2 (en) * 2010-10-27 2015-03-03 Toyota Jidosha Kabushiki Kaisha Control apparatus for internal combustion engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3316446A1 (en) 1982-05-07 1983-11-10 Nissan Motor Four cylinder combustion engine
US5271229A (en) 1992-06-01 1993-12-21 Caterpillar Inc. Method and apparatus to improve a turbocharged engine transient response
DE102005010673A1 (en) 2005-03-09 2006-09-14 Bayerische Motoren Werke Ag Multi-cylinder internal combustion engine operating method for motor vehicle, involves adjusting preset ideal running moment by operating cylinders groups with drive moment that increases/decreases in comparison to ideal running moment

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CN104343550A (en) 2015-02-11

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