Method for operating an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10316764-B2
Application number	US-201515122244-A
Country	US
Kind code	B2
Filing date	Feb 5, 2015
Priority date	Feb 27, 2014
Publication date	Jun 11, 2019
Grant date	Jun 11, 2019

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

The invention claimed is:

1. 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 method 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, wherein the step of performing the load regulation above the defined load threshold includes the regulator predefining, as the control variable, the valve timing for each cylinder, wherein the valve timing of each cylinder is adapted by adding a pilot-control value to the control variable.

2. The method according to claim 1 , including setting the defined load threshold to a value of approximately ⅛ of a maximum load.

3. The method according to claim 1 , including fully opening the throttle valve above the defined load threshold.

4. The method according to claim 1 , including using a single-loop regulator as the regulator.

5. The method according to claim 1 , wherein the pilot-control value is determined from a load jump increase and a setpoint load.

6. 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 so that above a defined load threshold the throttle valve is opened and the regulator predefines the valve timing for each cylinder as a control variable by adapting the valve timing by adding a pilot-controlled value to the control variable.

7. The arrangement as claimed in claim 6 , wherein the regulator is a single-loop regulator.

Assignees

• Mtu Friedrichshafen Gmbh

Inventors

• Boyde Jan
• Fimml Wolfgang
• Schäfer Erika

Classifications

• F02D41/0002

  Controlling intake air · CPC title

• F02D41/107

  and deceleration · CPC title

• F02D2041/1409

  using at least a proportional, integral or derivative controller · 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

• Y02T10/42

  Cross-Sectional Technologies · mapped topic