EP2808503A1 - Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps - Google Patents

Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps Download PDF

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Publication number
EP2808503A1
EP2808503A1 EP13169302.0A EP13169302A EP2808503A1 EP 2808503 A1 EP2808503 A1 EP 2808503A1 EP 13169302 A EP13169302 A EP 13169302A EP 2808503 A1 EP2808503 A1 EP 2808503A1
Authority
EP
European Patent Office
Prior art keywords
engine
cylinder
braking procedure
decompression
sleeve
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.)
Withdrawn
Application number
EP13169302.0A
Other languages
German (de)
English (en)
Inventor
Harald Fessler
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.)
FPT Motorenforschung AG
Original Assignee
FPT Motorenforschung AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by FPT Motorenforschung AG filed Critical FPT Motorenforschung AG
Priority to EP13169302.0A priority Critical patent/EP2808503A1/fr
Priority to CN201480030911.7A priority patent/CN105392970B/zh
Priority to BR112015029560-6A priority patent/BR112015029560B1/pt
Priority to ES14735862.6T priority patent/ES2662585T3/es
Priority to EP14735862.6A priority patent/EP3004575B1/fr
Priority to PCT/EP2014/060903 priority patent/WO2014191385A1/fr
Publication of EP2808503A1 publication Critical patent/EP2808503A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve

Definitions

  • One of the braking system concept is based on a compression-decompression event.
  • a compression phase where the fuel injection is inhibited, fresh air is compressed.
  • the exhaust valves are opened in order to release the compressed air, before such compressed air, acting as a spring, returns the energy received during the compression phase to the piston. Therefore, the engine compression energy is dissipated as braking force.
  • a special exhaust lift profile in combination with a standard inlet profile is provided in order to realize a 2-stroke like engine braking in a 4-stroke engine.
  • standard means that the cam profile commanding the inlet valves is completely unchanged with respect to the "fired” mode of the engine.
  • a compression-decompression event is carried out every crankshaft turn.
  • a decompression event at each TDC is carried out every crankshaft turn.
  • a braking strategy is carried out through the implementation of a cam shifting method, such as the " INA cam shifting method” Norbert Nitz, Harald Elendt, Arndt Ihlemann, Andreas Nendel, Schaeffler Symposium 2010 .
  • the INA cam shifting method is based on a sleeve having at least two cam profiles.
  • the sleeve is able to slide axially on a base shaft, while it is forced to rotate with the base shaft.
  • the method of the present invention comprises a step of providing the exhaust sleeve with two or more cam profiles on adjacent portions of the sleeve and a step of axially shifting said sleeve on said base shaft in order to enable a profile implementing two decompression events of a braking procedure.
  • adjacent portions are clear in light of the abovementioned paper: several cam profiles are annularly defined on adjacent and consecutive portions of the sleeve along its longitudinal development.
  • the 2-stroke braking procedure is implemented by means of three-dimensional cams having different profiles according to an axial shifting of the cam itself on the base shaft.
  • An example of such tridimensional cams is shown on EP0208663 .
  • the use of an axially shifting cam profile method in an engine braking procedure is part of the present invention.
  • such method is implemented in order to carry out an engine braking operation in heavy and commercial vehicles.
  • control of the engine valves during a braking operation is carried out through at least one cam profile switched according to a cam shifting method, i.e., by axially shifting a sleeve on the base shaft in order to enable a different cam profile.
  • the first compression phase coincides with the standard compression phase, i.e. when the engine is fired, even if during the braking procedure, the engine is obviously braked.
  • the first decompression event happens approximately at the TDC. It is preferable that the exhaust valves open slightly before the piston reaches the TDC, to release the pressure. According to the present invention the exhaust valves remain open - on the contrary with the respect to a standard (fired) valve behaviour - after said first decompression event in order to permit the same piston to suck air from the exhaust pipe.
  • the exhaust valves are open in order to eject the exhaust gasses.
  • the exhaust valves are kept closed in order to carry out a second compression phase followed by a second decompression event.
  • the exhaust valves are kept open during the second lowering phase of the piston, namely the third phase of a 4-stroke engine cycle, and closed during the second lifting phase (fourth phase of a 4-stroke engine cycle).
  • the first sucking phase is realized through the inlet valves, thus the inlet cam lifting profile is unchanged, while the second sucking phase is realized through the outlet valves, thus only the outlet cam lifting profile is varied.
  • Figure 1 shows a comparison, through the four phases of a 4-stroke engine, between a fired condition from F-I to F-IV, on the left of the figure, and a braking procedure from B-I to B-IV, on the right of the figure, according to the present invention.
  • F-I and B-I first lowering of the piston for sucking fresh air from the inlet side. This phase is in common with both the conditions standard/braking, that is when the engine is fired and when it is in braking mode;
  • F-II and B-II first lifting of the piston; during the braking procedure the fuel injection is inhibited and the second phase, B-II comprises the decompression event B-II'; F-III and B-III: second lowering of the piston: when the engine is fired both the inlet and outlet valves are closed; when the engine is in braking mode the exhaust valve is open, in order to carry out a second air sucking, but from the exhaust side;
  • F-IV and B-IV when the engine is fired, during the fourth phase the exhaust gasses are ejected by the exhaust valves, instead during the braking procedure, the exhaust valves follow the same behaviour discussed during the second phase, that is a compression phase B-IV followed by decompression event B-IV'.
  • the decompression events are always commanded by the outlet cam/valve.
  • Figure 2 shows a diagrammatic comparison of an exhaust cam profile between the two conditions standard (fired) and braked.
  • the dashed line refers to the braking profile, i.e. to the eccentricity of a portion of the sleeve defining the "braking profile".
  • the cam profile enabled is the dashed one on figure 2 : it
  • the continuous line of figure 2 shows a standard exhaust lift profile, adopted when the engine is fired.
  • the just one peak is disposed substantially between said first and second peaks of the dashed curve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Valve Device For Special Equipments (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
EP13169302.0A 2013-05-27 2013-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps Withdrawn EP2808503A1 (fr)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP13169302.0A EP2808503A1 (fr) 2013-05-27 2013-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps
CN201480030911.7A CN105392970B (zh) 2013-05-27 2014-05-27 执行发动机制动过程的方法和设备、内燃机及陆地车辆
BR112015029560-6A BR112015029560B1 (pt) 2013-05-27 2014-05-27 Método para realizar um procedimento de frenagem de motor com base em eventos de descompressão para um motor de ciclo de 4 cursos, dispositivo para realizar o dito procedimento, e meios de controle
ES14735862.6T ES2662585T3 (es) 2013-05-27 2014-05-27 Sistema para realizar un procedimiento de frenado de un motor basado en eventos de descompresión para un motor de ciclo de 4 tiempos
EP14735862.6A EP3004575B1 (fr) 2013-05-27 2014-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps
PCT/EP2014/060903 WO2014191385A1 (fr) 2013-05-27 2014-05-27 Système permettant d'exécuter une procédure de freinage moteur sur la base d'événements de décompression pour un moteur à 4 temps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13169302.0A EP2808503A1 (fr) 2013-05-27 2013-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps

Publications (1)

Publication Number Publication Date
EP2808503A1 true EP2808503A1 (fr) 2014-12-03

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Family Applications (2)

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EP13169302.0A Withdrawn EP2808503A1 (fr) 2013-05-27 2013-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps
EP14735862.6A Active EP3004575B1 (fr) 2013-05-27 2014-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps

Family Applications After (1)

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EP14735862.6A Active EP3004575B1 (fr) 2013-05-27 2014-05-27 Système permettant de réaliser une intervention de freinage moteur sur la base des événements de décompression pour un moteur à cycle à quatre temps

Country Status (5)

Country Link
EP (2) EP2808503A1 (fr)
CN (1) CN105392970B (fr)
BR (1) BR112015029560B1 (fr)
ES (1) ES2662585T3 (fr)
WO (1) WO2014191385A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600130806A1 (it) 2016-12-23 2018-06-23 Fpt Motorenforschung Ag Metodo per eseguire un riscaldamento di un sistema di post trattamento di un motore a combustione interna ed il motore a combustione interna predisposto per attuare detto metodo
DE102017003081A1 (de) 2017-03-31 2018-10-04 Man Truck & Bus Ag Variabler Ventiltrieb mit Bremsnocken
DE102018105359A1 (de) * 2018-03-08 2019-09-12 Man Truck & Bus Ag Variabler Ventiltrieb mit Schiebenockensystem für eine Brennkraftmaschine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4512154A (en) * 1971-09-22 1985-04-23 Takahiro Ueno Method for driving a vehicle driven by an internal combustion engine
EP0208663A1 (fr) 1985-07-02 1987-01-14 FIAT AUTO S.p.A. Système de poussoir pour moteur à combustion interne avec arbre à cames à profil variable
US20040187842A1 (en) * 2002-12-23 2004-09-30 Zhou Yang Engine braking methods and apparatus
DE102004006681A1 (de) * 2004-02-06 2005-08-25 Daimlerchrysler Ag Aufgeladene Motorbremse und Zweitaktverfahren
US20090038584A1 (en) * 2006-02-07 2009-02-12 Wolfram Schmid Internal combustion engine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB307753A (fr) * 1928-03-12 1930-06-11 Motorwagenfabrik Berna A.G.
CN201241740Y (zh) * 2008-08-07 2009-05-20 俞黎明 四冲程内燃发动机摇臂集成式制动装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4512154A (en) * 1971-09-22 1985-04-23 Takahiro Ueno Method for driving a vehicle driven by an internal combustion engine
EP0208663A1 (fr) 1985-07-02 1987-01-14 FIAT AUTO S.p.A. Système de poussoir pour moteur à combustion interne avec arbre à cames à profil variable
US20040187842A1 (en) * 2002-12-23 2004-09-30 Zhou Yang Engine braking methods and apparatus
DE102004006681A1 (de) * 2004-02-06 2005-08-25 Daimlerchrysler Ag Aufgeladene Motorbremse und Zweitaktverfahren
US20090038584A1 (en) * 2006-02-07 2009-02-12 Wolfram Schmid Internal combustion engine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NORBERT NITZ; HARALD ELENDT; ARNDT IHLEMANN; ANDREAS NENDEL: "INA cam shifting method", 2010, SCHAEFFLER SYMPOSIUM

Also Published As

Publication number Publication date
BR112015029560A2 (pt) 2017-07-25
EP3004575A1 (fr) 2016-04-13
BR112015029560B1 (pt) 2022-07-05
CN105392970B (zh) 2017-10-03
CN105392970A (zh) 2016-03-09
EP3004575B1 (fr) 2017-12-13
WO2014191385A1 (fr) 2014-12-04
ES2662585T3 (es) 2018-04-09

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