Supercharged internal combustion engine

Patent metadata

Field	Value
Publication number	US-10697359-B2
Application number	US-201816016173-A
Country	US
Kind code	B2
Filing date	Jun 22, 2018
Priority date	Jun 30, 2017
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

An internal combustion engine is described. The internal combustion engine comprises a valve control which is configured to close inlet valves of the internal combustion engine at Miller or Atkinson closing times. An electrified exhaust-gas turbocharger of the internal combustion engine comprises an electric machine which is operable selectively as a motor or generator. A control unit operates the electric machine of the electrified exhaust-gas turbocharger as a motor in a first load range of the internal combustion engine and as a generator in a second load range which corresponds to greater loads of the internal combustion engine than the first load range.

First claim

I claim:

1. An internal combustion engine comprising:
a valve controller which is configured to close inlet valves of the internal combustion engine at Miller or Atkinson closing times, wherein the closing times of the valve controller are invariable;
an electrified exhaust-gas turbocharger having an electric machine which is operable selectively as a motor or generator; and
a control unit which is configured to operate the electric machine of the electrified exhaust-gas turbocharger as a motor in a first load range of the internal combustion engine and to operate same as a generator in a second load range which corresponds to greater loads of the internal combustion engine than the first load range.

2. The internal combustion engine according to claim 1 , wherein the control unit is configured to not operate the electric machine of the electrified exhaust-gas turbocharger as a generator in the first load range and/or to operate the electric machine of the electrified exhaust-gas turbocharger as a generator only in the second load range.

3. The internal combustion engine according to claim 1 , wherein the exhaust-gas turbocharger comprises a compressor and a turbine driving the compressor, which are designed to generate a charge pressure that compensates a charging volume, reduced with respect to the displacement on account of the closing times, in the first load range of the internal combustion engine.

4. The internal combustion engine according to claim 3 , wherein a turbine cross section of the turbine is dimensioned or a turbine geometry of the turbine is shaped such that the exhaust-gas turbocharger compensates the charging volume, reduced by the closing times, by the charge pressure in the first load range.

5. The internal combustion engine according to claim 3 , wherein the turbine cross section and/or the turbine geometry is invariable.

6. The internal combustion engine according to claim 4 , wherein the control unit is configured to convert a mechanical power of the turbine, which goes beyond the power required by the compressor for compensation, by means of the electric machine operated as a generator, in the second load range.

7. The internal combustion engine according to claim 3 , wherein the electric machine of the exhaust-gas turbocharger is rigidly coupled to the turbine of the exhaust-gas turbocharger.

8. The internal combustion engine according to claim 1 , wherein the valve controller comprises a camshaft driven by a crankshaft of the internal combustion engine, said camshaft determining the closing times.

9. The internal combustion engine according to claim 1 , wherein the internal combustion engine also comprises a rechargeable energy store which is connected or connectable to the electric machine of electrified exhaust-gas turbocharger in order to store the electrical energy output during operation as a generator.

10. The internal combustion engine according to claim 1 , wherein the internal combustion engine also comprises a second electric machine, which is configured as a power machine in order to convert electrical energy output by the electrified exhaust-gas turbocharger in the second power range.

11. The internal combustion engine according to claim 10 , wherein the second electric machine is connected or connectable to the electrical energy store for power supply.

12. The internal combustion engine according to claim 10 , wherein the control unit is also configured to connect the second electric machine to the electric machine, operated as a generator, of the electrified exhaust-gas turbocharger for power supply by said electric machine.

13. The internal combustion engine according to claim 1 , wherein a wastegate is arranged in the exhaust-gas flow of the internal combustion engine, and the control unit is also configured to open the wastegate in a part of the second load range which corresponds to high loads within the second load range.

14. A motor vehicle, comprising:
an internal combustion engine;
a valve controller which is configured to close inlet valves of the internal combustion engine at Miller or Atkinson closing times, wherein the closing times of the valve controller are invariable;
an electrified exhaust-gas turbocharger having an electric machine which is operable selectively as a motor or generator; and
a control unit which is configured to operate the electric machine of the electrified exhaust-gas turbocharger as a motor in a first load range of the internal combustion engine and to operate same as a generator in a second load range which corresponds to greater loads of the internal combustion engine than the first load range.

15. The motor vehicle of claim 14 , wherein the motor vehicle is a commercial vehicle.

Assignees

• Man Truck & Bus Ag

Inventors

• Weiss Joachim

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• B60K6/485 Primary

  Motor-assist type · CPC title

• F02D41/0007

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

• F02D13/0269

  Controlling the valves to perform a Miller-Atkinson cycle · CPC title

• F02B39/10 Primary

  electric · CPC title