METHOD FOR OPERATING A COMBUSTION ENGINE SYSTEM

• US 20200131981A1
• Filed: 10/25/2019
• Published: 04/30/2020
• Est. Priority Date: 10/26/2018
• Status: Active Grant

• Current Assignee: BMTS Technology GmbH & Co. KG
• Original Assignee: BMTS Technology GmbH & Co. KG
• Inventors: Buerkle, Michael, Weiss, Hartmut
• Granted Patent: US 11,111,844 B2
• Time in Patent Office: Days
• CPC Class Codes: F01N 13/009 having two or more separate purifying devices arranged in series
• CPC Class Codes: F01N 2410/00 By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
• CPC Class Codes: F01N 2410/03 in case of low temperature
• CPC Class Codes: F01N 2410/06 at cold starting
• CPC Class Codes: F01N 2430/00 Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
• CPC Class Codes: F01N 2900/08 said parameters being related to the engine
• CPC Class Codes: F01N 2900/1404 Exhaust gas temperature
• CPC Class Codes: F01N 2900/1602 Temperature of exhaust gas apparatus
• CPC Class Codes: F01N 2900/1626 Catalyst activation temperature
• CPC Class Codes: F01N 3/2006 Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating by electrically controlling the supply of combustible mixture or its constituents only F02D41/0235
• CPC Class Codes: F01N 3/2053 By-passing catalytic reactors, e.g. to prevent overheating
• CPC Class Codes: F01N 3/2882 Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices combined with absorbents or adsorbents only F01N3/0814; combined with particulate filters F01N3/035
• CPC Class Codes: F01N 5/04 the devices using kinetic energy
• CPC Class Codes: F01N 9/00 Electrical control of exhaust gas treating apparatus monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00
• CPC Class Codes: F02B 37/10 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 Class Codes: F02B 37/14 Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02B 37/183 Arrangements of bypass valves or actuators therefor
• CPC Class Codes: F02B 37/24 by using pumps or turbines with adjustable guide vanes
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: F02C 6/12 : Turbochargers, i.e. plants for augmenting mechanical power output of internal-combustion piston engines by increase of charge pressure
• CPC Class Codes: F02C 9/18 : by bleeding, bypassing or acting on variable working fluid interconnections between turbines or compressors or their stages F02C3/113 takes precedence
• CPC Class Codes: F02D 2200/0802 : Temperature of the exhaust gas treatment apparatus
• CPC Class Codes: F02D 41/0007 : for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/0245 : by increasing temperature of the exhaust gas leaving the engine
• CPC Class Codes: F02D 41/0255 : to accelerate the warming-up of the exhaust gas treating apparatus at engine start
• CPC Class Codes: F05D 2220/40 : in turbochargers
• CPC Class Codes: Y02T 10/12 : Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 : Engine management systems

Abstract

The present disclosure relates to a combustion engine system and a method of operation thereof. The combustion engine system includes a pollutant conversion system and an exhaust gas turbocharger that includes a variable turbine geometry and a waste gate valve. The variable turbine geometry includes adjustable guide elements surrounding the turbine wheel in a circumferential direction and are arranged to define an overall cross-section in their respective position for the exhaust gas. In a control mode where the pollutant conversion system comprises a temperature above a threshold temperature, the guide elements are adjusted such that the overall cross-section is between a control minimum value and a control maximum value. In a heat-up mode at temperatures of the pollutant conversion system below the threshold temperature, the guide elements are moved to a heat-up position where the overall cross-section is smaller than the control minimum value.

Claims

1. A method for operating a combustion engine system, comprising:

generating exhaust gas via a combustion engine when in operation,

feeding fresh air via a fresh air system to the combustion engine and dissipating exhaust gas via an exhaust gas system from the combustion engine,

operating an exhaust gas turbocharger that comprises a compressor wheel incorporated in the fresh air system for compressing the fresh air and a turbine wheel incorporated in the exhaust gas system for driving the compressor wheel,

providing an adjustable waste gate valve of the exhaust gas turbocharger, structured and arranged in a bypass position to guide exhaust gas via a bypass channel past the turbine wheel,

providing a pollutant conversion system incorporated in the exhaust gas system for reducing pollutants in the exhaust gas, the pollutant conversion system configured such that it has a threshold temperature above which pollutants are reduced,

providing a variable turbine geometry of the exhaust gas turbocharger comprising adjustable guide elements surrounding the turbine wheel in a circumferential direction, the guide elements following one another in the circumferential direction and define an overall cross-section in their respective direction position for the exhaust gas to flow through,

adjusting the guide elements in a control mode, where the pollutant conversion system comprises a temperature above the threshold temperature, such that the overall cross-section is between a control minimum value and a control maximum value, and

operating in a heat-up mode at temperatures of the pollutant conversion system below the threshold temperature where the guide elements are moved into a heat-up position (34), in which the overall cross-section is smaller than the control minimum value.

2. The method according to claim 1, further comprising closing the variable turbine geometry in heat-up mode such that the guide elements define a closed surface in the heat-up position in the circumferential direction.

3. The method according to claim 1, wherein the waste gate valve in heat-up mode is moved into the bypass position.

4. The method according to claim 3, wherein the waste gate valve in heat-up mode is opened to a maximum extent.

16. The method according to claim 1, further comprising compressing via an electric motor the air in the fresh air system, wherein the electric motor is operated in heat-up mode for compressing the air when a load requirement from the combustion engine exceeds a predefined first threshold value.

5. A combustion engine system, comprising:

a combustion engine that produces exhaust gas when in operation,

a fresh air system for feeding fresh air to the combustion engine and an exhaust gas system for dissipating exhaust gas,

an exhaust gas turbocharger including a compressor wheel incorporated in the fresh air system for compressing the fresh air and a turbine wheel incorporated in the exhaust gas system for driving the compressor wheel,

an adjustable waste gate valve of the exhaust gas turbocharger, the waste gate valve adjustable between a closed position and a bypass position and when in the bypass position guides exhaust gas via a bypass channel past the turbine wheel,

a pollutant conversion system incorporated in the exhaust gas system for reducing pollutants in the exhaust gas,

a variable turbine geometry of the exhaust gas turbocharger, the variable turbine geometry including a plurality of adjustable guide elements surrounding the turbine wheel in a circumferential direction, the plurality of guide elements structured and arranged to follow one another in the circumferential direction and define an overall cross-section in their respective position for the exhaust gas to flow through,

a control system, the control system being communicatively connected to the exhaust gas turbocharger,

wherein the control system is configured to, in a control mode where the pollutant conversion system comprises a temperature above a threshold temperature, adjust the plurality of guide elements such that the overall cross-section is between a control minimum value and a control maximum value, and

wherein the control system is further configured to, in a heat-up mode at temperatures of the pollutant conversion system below the threshold temperature, move the plurality of guide elements into a heat-up position where the overall cross-section is smaller than the control minimum value.

6. The combustion engine system according to claim 5, wherein in heat-up position adjacent guide elements of the plurality of guide elements contact each other in the circumferential direction.

7. The combustion engine system according to claim 6, wherein in heat-up position said adjacent guide elements are superimposed on each other in the circumferential direction.

8. The combustion engine system according to claim 6, wherein:

a respective guide element includes a tip facing the adjacent guide element in the circumferential direction when in heat-up mode (34) and an end section remote from the tip, and

in heat-up position the respective guide element with the tip is supported on the end section of the adjacent guide element in the circumferential direction.

9. The combustion engine system according to claim 8, wherein in heat-up position the tip is supported on a surface of the end section facing towards the turbine wheel.

10. The combustion engine system according to claim 5, wherein the pollutant conversion system is incorporated in the exhaust gas system downstream of the turbine wheel and downstream of the bypass channel.

11. The combustion engine system according to claim 5, further comprising:

an auxiliary pollutant reducing system incorporated in the exhaust gas system such that the exhaust gas flowing through the bypass channel flows through the auxiliary pollutant reducing system,

wherein the auxiliary pollutant reducing system configured to need less thermal energy for reaching an operating temperature than the pollutant conversion system.

12. The combustion engine system according to claim 11, wherein the auxiliary pollutant reducing system is incorporated in the exhaust gas system upstream of the pollutant conversion system.

13. The combustion engine system according to claim 12, wherein the auxiliary pollutant reducing system is incorporated into the bypass channel of the exhaust gas system.

14. The combustion engine system according to claim 5, further comprising an electric motor for compressing the air in the fresh air system, wherein the electric motor drives at least one of the compressor wheel and a separate additional compressor arranged separate from the compressor wheel.

15. The combustion engine system according to claim 6, further comprising an electric motor for compressing the air in the fresh air system, wherein the electric motor drives at least one of the compressor wheel and a separate additional compressor arranged separate from the compressor wheel.

17. The method according to claim 15, wherein in heat-up mode, once a second threshold value of the load requirement from the combustion engine is exceeded, which is greater in comparison to the predefined first threshold value, a change-over into a conventional cold start mode takes place, in which the waste gate valve and the variable turbine geometry are adjusted in accordance with the load requirement.

18. The method according to claim 15, further comprising closing the variable turbine geometry in heat-up mode such that the guide elements define a closed surface in the heat-up position in the circumferential direction.

19. The method according to claim 15, wherein the waste gate valve in heat-up mode is moved into the bypass position.

20. The method according to claim 19, wherein the waste gate valve in heat-up mode is opened to a maximum extent.