EP 2877717 B1 20160608 - METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH ELECTROHYDRAULIC VALVE CONTROL MEANS
Title (en)
METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE WITH ELECTROHYDRAULIC VALVE CONTROL MEANS
Title (de)
VERFAHREN ZUM BETRIEB EINER BRENNKRAFTMASCHINE MIT ELEKTROHYDRAULISCHER VENTILSTEUERUNG
Title (fr)
PROCÉDÉ DE FONCTIONNEMENT D'UN MOTEUR À COMBUSTION INTERNE À COMMANDE DE SOUPAPE ÉLECTROHYDRAULIQUE
Publication
Application
Priority
- DE 102012212989 A 20120724
- DE 2013200072 W 20130724
Abstract (en)
[origin: WO2014015869A1] The invention relates to a method for operating an internal combustion engine (4) with electrohydraulic valve control means (1) for the variable-lift drive of a gas exchange valve (3), comprising a camshaft (6) and a hydraulic system arranged in the drive path between the camshaft and the gas exchange valve, said hydraulic system being connected to a pressure medium supply (14) of the internal combustion engine, a first hydraulic piston (8) which is driven by a cam (5) of the camshaft and a second hydraulic piston (9) which drives the gas exchange valve in an opening direction, a variable-volume pressure chamber (10) which is delimited by the hydraulic piston and a control duct (12) which connects the pressure chamber to a pressure relief chamber (11), an electrically actuated hydraulic valve (15) which is arranged in the control duct and which, in an open position, permits a flow of hydraulic medium through the control duct and, in a closed position, blocks a flow of hydraulic medium through the control duct, and an electronic actuation means (16) for the actuation of the hydraulic valve as a function of operating parameters of the internal combustion engine. To improve the cold-start behaviour of the internal combustion engine, it is provided that, during the starting phase, the hydraulic valve is closed and opened again at least once between two immediately successive lifts of the first hydraulic piston.
IPC 8 full level
F01L 1/24 (2006.01); F01L 9/11 (2021.01); F01L 9/14 (2021.01)
CPC (source: CN EP US)
F01L 1/24 (2013.01 - EP US); F01L 9/11 (2021.01 - CN EP US); F01L 9/14 (2021.01 - CN EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2014015869 A1 20140130; CN 104619960 A 20150513; CN 104619960 B 20170627; DE 102012212989 A1 20140130; EP 2877717 A1 20150603; EP 2877717 B1 20160608; US 2015176439 A1 20150625; US 9435231 B2 20160906
DOCDB simple family (application)
DE 2013200072 W 20130724; CN 201380038669 A 20130724; DE 102012212989 A 20120724; EP 13758723 A 20130724; US 201314416422 A 20130724