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1. WO2006042785 - METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE

Publication Number WO/2006/042785
Publication Date 27.04.2006
International Application No. PCT/EP2005/054980
International Filing Date 04.10.2005
IPC
F01L 13/00 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
F01L 9/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
9Valve-gear or valve arrangements actuated non-mechanically
02by fluid means, e.g. hydraulic
F01L 9/04 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
9Valve-gear or valve arrangements actuated non-mechanically
04by electric means
F01L 1/26 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
26characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift valves per cylinder
F02M 25/07 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
25Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
06adding lubricant vapours
07adding exhaust gases
F02B 27/02 2006.01
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
27Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
02the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
CPC
F01L 1/26
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
26characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
F01L 1/267
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
26characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
267with means for varying the timing or the lift of the valves
F01L 13/0005
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
13Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
0005Deactivating valves
F01L 2001/34446
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
1Valve-gear or valve arrangements, e.g. lift-valve gear
34characterised by the provision of means for changing the timing of the valves without changing the duration of opening ; and without affecting the magnitude of the valve lift
344changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
3442using hydraulic chambers with variable volume to transmit the rotating force
34423Details relating to the hydraulic feeding circuit
34446Fluid accumulators for the feeding circuit
F01L 9/025
F01L 9/04
Applicants
  • ROBERT BOSCH GMBH [DE]/[DE] (AllExceptUS)
  • WUERFEL, Gernot [DE]/[DE] (UsOnly)
Inventors
  • WUERFEL, Gernot
Common Representative
  • ROBERT BOSCH GMBH
Priority Data
10 2004 050 225.015.10.2004DE
Publication Language German (DE)
Filing Language German (DE)
Designated States
Title
(DE) VERFAHREN ZUM BETREIBEN EINER BRENNKRAFTMASCHINE
(EN) METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE
(FR) PROCEDE POUR FAIRE FONCTIONNER UN MOTEUR A COMBUSTION INTERNE
Abstract
(DE)
Bekannte Verfahrenen zum Betreiben einer Brennkraftmaschine haben mehrere Zylinder, in denen jeweils ein Kolben axial beweglich angeordnet ist, und den Zylindern zugeordnete Einlassventile und Auslassventile. Diese sind derart ansteuerbar, dass die Ventilsteuerzeiten zumindest der Auslassventile in Abhängigkeit von einem Betriebszustand der Brennkraftmaschine variabel einstellbar sind, wobei zumindest eines der Auslassventile in einem Ausstoßtakt der Brennkraftmaschine geöffnet und vor Erreichen eines oberen Totpunktes des Kolbens zumindest teilweise geschlossen wird. In einem nachfolgenden Ansaugtakt wird zumindest eines der Einlassventile geöffnet. Die Brennkraftmaschine wird mit einer internen Abgasrückführung betrieben, indem eine sogenannte Ventilüberschneidung der Einlass- und Auslassventile vorgesehen ist. Ein wesentlicher Nachteil der internen Abgasrückführung mittels Ventilüberschneidung besteht darin, dass die Abgasrückführraten sehr begrenzt sind, da die Einlass- und Auslassventile in der Ventilüberschneidungsphase nur sehr kurz gleichzeitig geöffnet sind, so dass nur ein geringer Volumenstrom an Abgas wieder in den Brennraum zurückgeführt werden kann. Bei dem erfindungsgemäßen Verfahren wird die Abgasrückführrate erhöht, indem dem Auslassventil eine längere Ventilöffnungsdauer ermöglicht wird. Erfindungsgemäß ist vorgesehen, dass im Ansaugtakt nochmals eines der Auslassventile (9.1,9.2) geöffnet wird.
(EN)
Known methods for operating an internal combustion engine comprise several cylinders, in which a respective piston is located in an axially displaceable manner, and inlet and outlet valves that are allocated to the cylinders. Said valves can be controlled in such a way that at least the valve timing of the outlet valves can be adjusted in accordance with an operating mode of the internal combustion engine, at least one of the outlet valves being opened during an emission cycle and being at least partially closed before reaching the top dead centre of the piston. In a subsequent induction cycle, at least one of the inlet valves is opened. The internal combustion engine is operated with internal exhaust-gas re-circulation, produced by a valve overlap of the inlet and outlet valves. The basic disadvantage of an internal exhaust-gas re-circulation is that the exhaust-gas re-circulation rates are restricted, as the inlet and outlet valves in the valve overlap phase are only simultaneously open for a short period, permitting only a low volumetric flow of exhaust-gas to be re-circulated to the combustion chamber. The inventive method increases the exhaust-gas re-circulation rates by allowing the outlet valve a longer opening duration. According to the invention, one of the outlet valves (9.1, 9.2) is re-opened during the induction phase.
(FR)
Des procédés connus pour faire fonctionner un moteur à combustion interne comportent plusieurs cylindres dans lesquels sont montés des pistons à mouvement axial et auxquels sont associées des soupapes d'admission et des soupapes de refoulement. Ces soupapes sont commandées de telle sorte que la distribution des soupapes de refoulement au moins est réglable en fonction du mode de fonctionnement du moteur à combustion interne, au moins une des soupapes de refoulement étant ouverte lors du cycle de refoulement du moteur et au moins en partie fermée avant que le piston n'atteigne le point mort supérieur. Dans le cycle d'aspiration subséquent, au moins une des soupapes de refoulement est ouverte. Le moteur à combustion interne fonctionne avec un recyclage interne des gaz d'échappement, et avec chevauchement des soupapes d'admission et de refoulement. Le recyclage interne des gaz d'échappement par chevauchement des soupapes a un inconvénient notable, à savoir les taux de recyclage des gaz sont limités, étant donné que les soupapes d'admission et de refoulement, dans la phase de chevauchement, ne sont ouvertes simultanément que durant un laps de temps très court, de sorte qu'un faible volume de gaz échappement est renvoyé dans la chambre de combustion. L'invention vise à augmenter les taux de recyclage de gaz d'échappement. A cet effet, la soupape de refoulement a une durée d'ouverture prolongée. Selon l'invention, durant le cycle d'aspiration, une des soupapes de refoulement (9.1,9.2) est rouverte.
Also published as
Latest bibliographic data on file with the International Bureau