Method for operating an internal combustion engine

Patent metadata

Field	Value
Publication number	US-2016369708-A1
Application number	US-201515122244-A
Country	US
Kind code	A1
Filing date	Feb 5, 2015
Priority date	Feb 27, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

A method and an arrangement for operating an internal combustion engine. According to the method, a load threshold is defined below which load control by a throttle valve is performed.

First claim

1 - 9 . (canceled)

10 . A method for operating an internal combustion engine with variable valve drive, wherein the internal combustion engine comprises at least one cylinder having at least one inlet valve, the ethod comprising the steps of: performing load regulation above a defined load threshold by opening a throttle valve and predefining, by a regulator, a valve timing for each cylinder as a control variable; and performing the load regulation below the load threshold, by way of the throttle valve and predefining a fixed value for the valve timing.

11 . The method according to claim 10 , including setting the defined load threshold to a value of approximately ⅛ of a maximum load.

12 . The method according to claim 10 , including fully opening the throttle valve above the defined load threshold.

13 . The method according to claim 10 , including performing the load regulation above the defined load threshold by the regulator predefining, as the control variable, the valve timing for each cylinder, wherein the valve timing of each cylinder is adapted by a pilot-control value.

14 . The method according to claim 13 , wherein the pilot-control value is added.

15 . The method according to claim 10 , including using a single-loop regulator as the regulator.

16 . The method according to claim 13 , wherein the pilot-control value is determined from a load jump increase and a setpoint load.

17 . An arrangement for operating an internal combustion engine with variable valve drive, wherein the internal combustion engine has at least one cylinder with at least one inlet valve, the arrangement comprising: a regulator that predefines, as a control variable, a valve timing for each cylinder; and a throttle valve provided for actuation in a manner dependent on load, the arrangement being configured to perform load regulation.

18 . The arrangement as claimed in claim 17 , wherein the regulator is a single-loop regulator.

Assignees

• Mtu Friedrichshafen Gmbh

Inventors

• Boyde Jan
• Fimml Wolfgang
• Schäfer Erika

Classifications

• F02D41/107

  and deceleration · CPC title

• F02D13/0223 Primary

  Variable control of the intake valves only · CPC title

• F02D13/023 Primary

  the change of valve timing is caused by the change in valve lift, i.e. both valve lift and timing are functionally related · CPC title

• F02D41/008 Primary

  Controlling each cylinder individually · CPC title

• F02D2041/141

  using a feed-forward control element · CPC title