Exhaust gas routing system having an actuable exhaust gas turbine

Patent metadata

Field	Value
Publication number	US-10914248-B2
Application number	US-202016775341-A
Country	US
Kind code	B2
Filing date	Jan 29, 2020
Priority date	Nov 17, 2017
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A method and system for controlling temperature in an exhaust gas routing system of an internal combustion engine is provided. The exhaust gas routing system includes an exhaust gas manifold, an exhaust gas turbine which includes an electric machine arranged downstream of the exhaust gas manifold in the exhaust gas stream, an aftertreatment system arranged downstream of the exhaust gas turbine, and a control means configured to control the operation of the electric machine to adapt an operating mode of the exhaust gas turbine between motor operating, regeneration operating and neutral operating modes control means (50) such that the temperature of the aftertreatment system is controlled based on a target temperature.

First claim

What is claimed is:

1. An exhaust gas routing system for an internal combustion engine of a machine vehicle, comprising:
an exhaust manifold;
an exhaust gas turbine arranged downstream of the exhaust manifold in a flow direction of an exhaust gas flow from the internal combustion engine, wherein
the exhaust gas turbine including an electric machine configured to transfer torque to and receive torque from the exhaust gas turbine, and
the exhaust gas turbine, a rotor of the electric machine and an intake compressor are fixed for co-rotation on a common shaft;

a post-treatment infeed configured to receive the exhaust gas flow from the exhaust gas turbine; and
a control means configured to actuate an operating mode of the electric machine as a function of an operating situation of the internal combustion engine;
a first temperature detector configured to detect an exhaust gas temperature upstream of the exhaust gas turbine in the exhaust gas routing system; and
a second temperature detector configured to detect an exhaust gas temperature at a location in the exhaust gas routing system between the exhaust gas turbine and the post-treatment infeed;
wherein the control means is configured to switch the operating mode of the electric machine as a function of the exhaust gas temperature detected by the first and second temperature detectors, such that
when an exhaust gas turbine inlet exhaust gas temperature detected by the first temperature detector reaches a first predetermined temperature limit, the operating mode of the electric machine is switched to a machine operation mode in which the electric machine is operated to increase a rotation speed of the exhaust gas turbine,
when a post-treatment infeed temperature detected by the second temperature detector reaches a second predetermined temperature post-treatment infeed temperature limit, the operating mode of the electric machine is switched to a recuperation machine operation mode in which the electric machine is operated as a generator to decrease a rotation speed of the exhaust gas turbine.

2. The exhaust gas routing system according to claim 1 , wherein
the control means is configured to switch the operating mode of the electric machine between machine operation mode and recuperation operation mode.

3. The exhaust gas routing system according to claim 2 , wherein
the control means is configured to also switch the electric machine the operating mode to a neutral operation mode in which the electric machine does not apply torque to the common shaft.

4. The exhaust gas routing system according to claim 1 , wherein
the control means is configured to control the electric machine operating mode using temperature detected by one or both of the first and second temperature detectors and a stored temperature model of one or both of the internal combustion engine and the exhaust gas routing system.

5. The exhaust gas routing system according to claim 1 , further comprising:
a wastegate line in the exhaust gas routing system between location upstream and downstream of the exhaust gas turbocharger, the wastegate line including a wastegate valve controlled by the control means,
wherein the wastegate valve is partially or fully closed when the exhaust gas turbine is operating in the recuperation operation mode.

6. A drive for a machine vehicle, comprising:
an internal combustion engine; and
the exhaust gas routing system of claim 1 ,
wherein the control means is configured to control one or both of adaptation of a lambda value of the air/fuel mixture injected in the internal combustion engine and advance of an ignition timing of the mixture, as a function of the operating mode of the exhaust gas turbine.

7. A method for discharging exhaust gases from an internal combustion engine having an exhaust gas routing system which includes
an exhaust gas turbocharger, the exhaust turbocharger including and exhaust gas turbine, and electric machine and an intake compressor, wherein the exhaust gas turbine, a rotor of the electric machine and the intake compressor are fixed for co-rotation on a common shaft,
a post-treatment infeed configured to receive exhaust gas flow from the exhaust gas turbine,
a first temperature detector configured to detect an exhaust gas temperature upstream of the exhaust gas turbine in the exhaust gas routing system, and
a second temperature detector configured to detect an exhaust gas temperature at a location in the exhaust gas routing system between the exhaust gas turbine and the post-treatment infeed,

comprising the acts of:
detecting an exhaust gas temperature upstream of the exhaust gas turbine with the first temperature detector and an exhaust gas temperature between the exhaust gas turbine and the post-treatment infeed with the second temperature detector; and
switching an operating mode of an electric machine of the exhaust gas turbine as a function of the exhaust gas temperature detected by the first and second temperature detectors such that
when an exhaust gas turbine inlet exhaust gas temperature detected by the first temperature detector reaches a first predetermined temperature limit, the operating mode of the electric machine is switched to a machine operation mode in which the electric machine is operated to increase a rotation speed of the exhaust gas turbine,
when a post-treatment infeed temperature detected by the second temperature detector reaches a second predetermined temperature post-treatment infeed temperature limit, the operating mode of the electric machine is switched to a recuperation machine operation mode in which the electric machine is operated as a generator to decrease a rotation speed of the exhaust gas turbine.

8. The method according to claim 7 , wherein:
the switching of the operating mode includes switching the exhaust gas turbine between a machine operation mode and a recuperation operation mode.

9. The method according to claim 8 , wherein:
the switching of the operating mode also switching to a neutral operation mode in which the electric machine does not apply torque to the common shaft.

10. The method according to claim 8 , wherein
the detected exhaust gas temperatures are compared with the predetermined temperature limits stored in a controller.

11. The method according to claim 8 , further comprising:
a wastegate line in the exhaust gas routing system between location upstream and downstream of the exhaust gas turbocharger, the wastegate line including a wastegate valve controlled by the control means,
wherein the wastegate valve is partially or fully closed when the exhaust gas turbine is operating in the recuperation operation mode.

12. The method according to claim 8 , wherein
the exhaust gas turbine is operated to generate a torque applied to the common shaft in the machine operation mode or in the recuperation operation mode which increases as the exhaust gas temperature detected by the first or second temperature detectors exceeds their respective associated temperature limits.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Heinisch Andreas
• Leinhos Dirk Christian
• Reulein Claus

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B37/10

  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

• F02D2200/0802

  Temperature of the exhaust gas treatment apparatus · CPC title

• F02D41/1446

  the characteristics being exhaust temperatures · CPC title

• F02D41/0007 Primary

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