Method for operating an internal combustion engine, and internal combustion engine

Patent metadata

Field	Value
Publication number	US-2015134230-A1
Application number	US-201514604665-A
Country	US
Kind code	A1
Filing date	Jan 23, 2015
Priority date	Jul 25, 2012
Publication date	May 14, 2015
Grant date	—

Abstract

A method for operating an internal combustion engine is provided. The internal combustion engine has a compressor for adjusting a charge density in an intake pipe of the internal combustion engine and has an adjusting device, such as a variable valve gear, for adjusting a volumetric efficiency of the internal combustion engine. A dynamic setpoint quantity for the internal combustion engine is determined as a function of a difference between a load demand upon the internal combustion engine and a current load output of the internal combustion engine. The volumetric efficiency and the charge density are adjusted as a function of the dynamic setpoint quantity. An internal combustion engine and a vehicle are also provided.

First claim

What is claimed is:

1 . A method for operating an internal combustion engine, the method comprising:
providing an internal combustion engine having a compressor for adjusting a charge density in an intake pipe of the internal combustion engine and having an adjusting device for adjusting a volumetric efficiency of the internal combustion engine; determining a dynamic setpoint quantity for the internal combustion engine as a function of a difference between a load demand upon the internal combustion engine and a current load output of the internal combustion engine; and adjusting the volumetric efficiency and the charge density as a function of the dynamic setpoint quantity.

2 . The method according to claim 1 , wherein the step of adjusting of the volumetric efficiency and the charge density includes:
adjusting the volumetric efficiency as a function of the dynamic setpoint quantity; and adjusting the charge density as a function of the dynamic setpoint quantity and of an adjusted volumetric efficiency.

3 . The method according to claim 2 , which comprises:
providing the adjusting device as configured to also adjust a residual gas proportion in a cylinder filling of the internal combustion engine; adjusting the residual gas proportion as a function of the dynamic setpoint quantity; and adjusting the charge density as a function of the dynamic setpoint quantity, of the adjusted volumetric efficiency and of an adjusted residual gas proportion.

4 . The method according to claim 1 , wherein the step of determining of the dynamic setpoint quantity includes:
determining the dynamic setpoint quantity as a function of a difference between the load demand upon the internal combustion engine and the current load output of the internal combustion engine and as a function of a time change of the load demand.

5 . The method according to claim 1 , wherein the internal combustion engine includes an Otto engine with a geometric compression ratio in a range of 12:1 to 15:1 and wherein the internal combustion engine is controlled in accordance with a Miller combustion process.

6 . The method according to claim 1 , wherein the adjusting device for adjusting the volumetric efficiency includes a variable valve gear, and wherein the adjusting of the volumetric efficiency includes:
determining an adjustment range of a valve lift of the variable valve gear as a function of the current load output; determining an adjustment range of a phase angle of an inlet camshaft of the variable valve gear as a function of the current load output; determining an adjustment range of a phase angle of an exhaust camshaft of the variable valve gear as a function of the current load output; and adjusting the valve lift, the phase angle of the inlet camshaft and the phase angle of the exhaust camshaft as a function of the dynamic setpoint quantity within respective determined adjustment ranges.

7 . The method according to claim 1 , wherein the compressor is driven by an exhaust gas turbine of the internal combustion engine with a variable turbine geometry, and wherein the adjusting of the charge density includes:
determining an adjustment range of the variable turbine geometry as a function of the current load output; and adjusting the variable turbine geometry as a function of the dynamic setpoint quantity within a determined adjustment range.

8 . An engine configuration, comprising:
an internal combustion engine having an intake pipe, a compressor for adjusting a charge density in said intake pipe, an adjusting device for adjusting a volumetric efficiency of said internal combustion engine, and a control device; and said control device being configured to determine a dynamic setpoint quantity for said internal combustion engine as a function of a difference between a load demand upon said internal combustion engine and a current load output of said internal combustion engine and to adjust the volumetric efficiency and the charge density as a function of the dynamic setpoint quantity.

9 . The engine configuration according to claim 8 , wherein said control device is configured to adjust the volumetric efficiency as a function of the dynamic setpoint quantity and to adjust the charge density as a function of the dynamic setpoint quantity and of an adjusted volumetric efficiency.

10 . The engine configuration according to claim 9 , wherein:
said adjusting device is configured to also adjust a residual gas proportion in a cylinder filling of said internal combustion engine as a function of the dynamic setpoint quantity; and said control device is configured to adjust the charge density as a function of the dynamic setpoint quantity, of the adjusted volumetric efficiency and of an adjusted residual gas proportion.

11 . The engine configuration according to claim 8 , wherein said control device is configured to determine the dynamic setpoint quantity as a function of a difference between the load demand upon said internal combustion engine and the current load output of said internal combustion engine and as a function of a time change of the load demand.

12 . The engine configuration according to claim 8 , wherein said internal combustion engine includes an Otto engine with a geometric compression ratio in a range of 12:1 to 15:1 and wherein said internal combustion engine is controlled in accordance with a Miller combustion process.

13 . The engine configuration according to claim 8 , wherein:
said adjusting device for adjusting the volumetric efficiency includes a variable valve gear having an inlet camshaft and an exhaust camshaft; and said control device is configured to adjust the volumetric efficiency by determining an adjustment range of a valve lift of said variable valve gear as a function of the current load output, by determining an adjustment range of a phase angle of said inlet camshaft of said variable valve gear as a function of the current load output, by determining an adjustment range of a phase angle of said exhaust camshaft of said variable valve gear as a function of the current load output, and by adjusting the valve lift, the phase angle of said inlet camshaft and the phase angle of said exhaust camshaft as a function of the dynamic setpoint quantity within respective determined adjustment ranges.

14 . The engine configuration according to claim 8 , wherein:
said internal combustion engine includes an exhaust gas turbine with a variable turbine geometry; said compressor is driven by said exhaust gas turbine; and said control device is configured to adjust the charge density by determining an adjustment range of the variable turbine geometry as a function of the current load output and by adjusting the variable turbine geometry as a function of the dynamic setpoint quantity within a determined adjustment range.

15 . A vehicle comprising:
an internal combustion engine having an intake pipe, a compressor for adjusting a charge density in said intake pipe, an adjusting device for adjusting a volumetric efficiency of said internal combustion engine, and a control device; and said control device being configured to determine a dynamic setpoint quantity for said internal combustion engine as a function of a difference between a load demand upon said internal combustion engine and a current load output of said internal combustion engine and to adjust the volumetric efficiency and the charge density as a function of the dynamic setpoint quantity.

Assignees

• Volkswagen Ag

Inventors

• Hoffmeyer Henrik
• Lindenkamp Nils

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02D2041/001

  for engines with variable valve actuation · CPC title

• F01L13/0015

  for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque · CPC title

• F02D41/0007 Primary

  for control of turbo-charged or super-charged engines (control of the pumps per se F02B37/12) · CPC title

• F02D2200/602

  Pedal position · CPC title