Spark-ignited internal combustion engine with electrically drivable exhaust gas turbocharger, and method for operating an internal combustion engine of this type

Patent metadata

Field	Value
Publication number	US-2016333775-A1
Application number	US-201615151297-A
Country	US
Kind code	A1
Filing date	May 10, 2016
Priority date	May 15, 2015
Publication date	Nov 17, 2016
Grant date	—

Abstract

The disclosure relates to a spark-ignited charged internal combustion engine coupled to an exhaust gas turbocharger with a compressor mounted on a rotatable shaft, the rotatable shaft coupled to a turbine and to an electric auxiliary drive. The electric auxiliary drive of the exhaust gas turbocharger may be activated to increase rotational speed of the rotatable shaft to drive the compressor to supply boost to the engine. The electric auxiliary drive may be engaged or disengaged from the rotatable shaft, responsive to engine operating conditions, such as engine speed, rotation speed of the rotatable shaft, exhaust volume, and engine boost demand.

First claim

1 . A spark-ignited charged internal combustion engine, comprising:
at least one cylinder; an intake system for feeding charge air to the at least one cylinder; an exhaust gas discharge system for discharging exhaust gas from the at least one cylinder; at least one exhaust gas turbocharger comprising a housing, a turbine, and a compressor, the turbine having at least one turbine impeller mounted on a rotatable shaft, the compressor having at least one compressor impeller mounted on the rotatable shaft; and an electric auxiliary drive including a stator and a rotor, the rotor of the electric auxiliary drive including a wheel arranged and mounted on the rotatable shaft of the exhaust gas turbocharger, the wheel running freely in one direction of rotation when a rotational speed of the rotatable shaft of the exhaust gas turbocharger is greater than a rotational speed of the wheel.

2 . The spark-ignited charged internal combustion engine of claim 1 , wherein the at least one exhaust gas turbocharger includes the turbine arranged in the exhaust gas discharge system and the compressor arranged in the intake system.

3 . The spark-ignited charged internal combustion engine of claim 1 , wherein the at least one exhaust gas turbocharger includes a first exhaust gas turbocharger and a second exhaust gas turbocharger, the first exhaust gas turbocharger including a first turbine arranged in the exhaust gas discharge system and a first compressor arranged in the intake system, and the second exhaust gas turbocharger including a second turbine arranged in the exhaust gas discharge system and a second compressor arranged in the intake system.

4 . The spark-ignited charged internal combustion engine of claim 1 , wherein the turbine of the at least one exhaust gas turbocharger does not have a bypass line.

5 . The spark-ignited charged internal combustion engine of claim 1 , wherein the turbine of the at least one exhaust gas turbocharger has a variable turbine geometry.

6 . The spark-ignited charged internal combustion engine of claim 1 , wherein the compressor coupled to the turbine of the at the least one exhaust gas turbocharger has a variable compressor geometry.

7 . The spark-ignited charged internal combustion engine of claim 1 , wherein an electrical storage battery is coupled to the electric auxiliary drive for storing electrical energy.

8 . The spark-ignited charged internal combustion engine of claim 1 , wherein the compressor of the at least one exhaust gas turbocharger is a radial compressor, the radial compressor having an entry region that extends and is formed coaxially with the shaft of the exhaust gas turbocharger.

9 . The spark-ignited charged internal combustion engine of claim 1 , wherein the electric auxiliary drive is arranged in the entry region of the radial compressor.

10 . The spark-ignited charged internal combustion engine of claim 1 , wherein the stator is arranged at least partially in the housing and is mounted fixed to the housing.

11 . The spark-ignited charged internal combustion engine of claim 1 , wherein the stator includes an energizable coil for establishing a magnetic field.

12 . The spark-ignited charged internal combustion engine of claim 1 , wherein the rotor includes at least one permanent magnet for establishing a magnetic field.

13 . The spark-ignited charged internal combustion engine of claim 12 , wherein the least one permanent magnet is arranged on a radially outer edge of the wheel of the rotor.

14 . The spark-ignited charged internal combustion engine of claim 1 , wherein the wheel of the rotor is arranged and mounted on the shaft of the exhaust gas turbocharger as a spoked wheel.

15 . The spark-ignited charged internal combustion engine of claim 1 , further comprising a controller including instructions executable to activate the electric auxiliary drive to the shaft responsive to the shaft rotating below a threshold speed.

16 . A method for operating an internal combustion, comprising:
flowing uncompressed intake air through a spoked wheel of a rotor of an auxiliary drive mounted on a shaft coupling a compressor and a turbine of an exhaust gas turbocharger, the rotor rotating freely when a rotation speed of the shaft is above a threshold speed, and the rotor engaged to the shaft when the rotation speed of the shaft is below the threshold speed; and compressing the intake air via the compressor.

17 . The method as claimed in claim 16 , further comprising energizing a coil of the auxiliary drive to generate an electromagnetic field responsive to the rotational speed of the shaft falling below the threshold.

18 . The method as claimed in claim 17 , wherein engaging the rotor to the shaft comprises activating the auxiliary drive responsive to a speed of the internal combustion engine falling below a predefinable engine speed.

19 . The method as claimed in one of claim 17 , wherein engaging the rotor to the shaft comprises activating the auxiliary drive responsive to an exhaust gas volume of the internal combustion engine falling below a predefinable exhaust gas volume.

20 . An engine system, comprising:
an electric auxiliary drive mounted on a rotatable shaft, the rotatable shaft coupled to a compressor and to a turbine, the compressor delivering boost through an intake system to an engine and the turbine receiving exhaust through an exhaust discharging system of the engine, the electric auxiliary drive including:
a rotor including a wheel mounted on the rotatable shaft, the rotor coupled to the shaft through a clutch;
at least one permanent magnet arranged on a radially outer edge of the wheel; and
a coil configured to generate an electromagnetic field; and
a controller storing instructions executable for energizing the coil to generate the electromagnetic field for rotating the rotor mounted on the rotatable shaft.

Assignees

• Ford Global Tech Llc

Inventors

• Kraemer Frank
• Smiljanovski Vanco
• Kemmerling Joerg
• Kindl Helmut Matthias
• Brinkmann Franz J

Classifications

• F02B39/10

  electric · CPC title

• F02B37/24

  by using pumps or turbines with adjustable guide vanes · CPC title

• F02B37/10 Primary

  at least one pump being alternatively {or simultaneously} driven by exhaust and other drive, {e.g. by pressurised fluid from a reservoir or an engine-driven pump} · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title