Operation of a quantity-controlled internal combustion engine having cylinder deactivation

Patent metadata

Field	Value
Publication number	US-2016146140-A1
Application number	US-201414904553-A
Country	US
Kind code	A1
Filing date	Apr 25, 2014
Priority date	Jul 12, 2013
Publication date	May 26, 2016
Grant date	—

Abstract

A method for operating a quantity-controlled internal combustion engine having at least two cylinders, including the following steps: ascertaining a present operating state; determining a number of cylinders or cylinder groups to be deactivated in dependence on the present operating state; deactivating or keeping deactivated a fuel supply for at least one cylinder to be deactivated or at least one cylinder group if at least one cylinder or at least one cylinder group is to be deactivated; and opening a flow-influencing element associated with the at least one cylinder or the at least one cylinder group for a fresh mass supply to the at least one cylinder to be deactivated or the at least one cylinder group to be deactivated.

First claim

1 - 10 . (canceled)

11 . A method for operating a quantity-controlled internal combustion engine with at least two cylinders, comprising the steps of:
ascertaining an instantaneous operating state; determining a number of cylinders or cylinder groups to be idled as a function of the instantaneous operating state; deactivating or keeping deactivated a fuel feed for at least one cylinder or at least one cylinder group to be idled, when at least one cylinder or at least one cylinder group is to be idled; and opening a flow-influencing element assigned to the at least one cylinder or the at least one cylinder group for a fresh mass feed to the at least one cylinder to be idled or the at least one cylinder group to be idled.

12 . The method according to claim 11 , further comprising closing a valve element arranged in a fluid path bridging an exhaust gas turbocharger.

13 . The method according to claim 11 , wherein, when full-load operation is ascertained, no cylinder is idled or fuel is supplied to all cylinders.

14 . The method according to claim 11 , including supplying fuel to individual cylinders of the internal combustion engine via mufti-point injection or via direct injection by injectors assigned to the cylinders, wherein the injectors are activated or deactivated as a function of the operating state.

15 . The method according to claim 11 , including supplying fresh air or a fresh air-fuel mixture to the cylinders via the fresh mass feed.

16 . The method according to claim 11 , wherein the flow-influencing element is a throttle valve or an intake valve with fully variable valve drive.

17 . The method according to claim 11 , including idling the cylinders individually or in groups.

18 . The method according to claim 17 , wherein a flow-influencing element is assigned to each cylinder or to each group of cylinders.

19 . The method according to claim 18 , wherein the flow-influencing element is a throttle valve or an intake valve with fully variable valve drive.

20 . A quantity-controlled internal combustion engine, comprising:
at least two cylinders; a separate fuel feed device assigned to each cylinder; a separate flow-influencing element for a respective fresh mass feed assigned to at least two groups of cylinders or to each cylinder; an exhaust gas turbocharger with a turbine and a compressor driven by the turbine, wherein the turbine is arranged in an exhaust gas line, wherein the compressor is arranged in a fresh mass line; at least one fluid path that bridges the exhaust gas turbocharger in the fresh mass line and/or in the exhaust gas line; a valve element arranged in the fluid path, the valve element having a first functional position that blocks the fluid path and a second functional position that opens the fluid path; and an engine control unit, configured and set up to implement a method according to claim 11 .

21 . The quantity-controlled internal combustion engine according to claim 20 , wherein the engine control unit is functionally connected to the flow-influencing elements, to the fuel feed devices, and to the valve element for influencing them.

22 . The quantity-controlled internal combustion engine according to claim 20 , wherein the engine control unit is functionally connected to a detection device for load demand or torque demand, and to a speed detection device.

23 . The quantity-controlled internal combustion engine according to claim 20 , wherein the engine is a gas engine.

Assignees

• Mtu Friedrichshafen Gmbh

Inventors

• Fimml Wolfgang
• Gorse Philippe
• Boog Manuel
• Kunkel Christian
• Matthies Jörg
• Bernhard Alexander
• Frank Tobias
• Kläser-Jenewein Ludwig
• Flohr Andreas

Classifications

• F02D2200/602

  Pedal position · CPC title

• F02D19/023

  to adjust the fuel mass or volume flow · CPC title

• F02D41/0087 Primary

  Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123) · CPC title

• F02D2041/0012

  with selective deactivation of cylinders · CPC title

• F02D13/0226

  changing valve lift or valve lift and timing · CPC title