System and method for operating a high pressure compressor bypass valve in a two stage turbocharger system

Patent metadata

Field	Value
Publication number	US-9109546-B2
Application number	US-35735909-A
Country	US
Kind code	B2
Filing date	Jan 21, 2009
Priority date	Jan 21, 2009
Publication date	Aug 18, 2015
Grant date	Aug 18, 2015

Abstract

A system and method for controlling air flow in an engine system. In one embodiment, the system includes an engine, a turbocharger coupled to the engine, and a compressor bypass valve coupled to the turbocharger and to the engine. The compressor bypass valve includes a mechanism that allows the compressor bypass valve to be closed by default and allows the compressor bypass valve to be actuated passively when acted upon by a boost pressure when the boost pressure increases above a predefined pressure threshold. According to the system and method disclosed herein, the compressor bypass valve is passive, and thus controls air flow to the engine without requiring active control circuitry or logic.

First claim

What is claimed is:

1. An engine system comprising:
an engine;
a first turbocharger and a second turbocharger coupled to the engine, the first turbocharger being a high pressure turbocharger with a first turbine and the second turbocharger being a low pressure turbocharger with a second turbine, and further comprising a turbine bypass valve coupled to a turbine bypass around the first turbine, wherein the turbine bypass valve is controlled to open in response to a turbine speed limit being reached; and
a compressor bypass valve coupled to the first turbocharger and to the engine, the compressor bypass valve comprises a mechanism that allows the compressor bypass valve to be closed by default and allows the compressor bypass valve to be actuated passively when acted upon by a boost pressure when the boost pressure increases above a predefined pressure threshold, wherein the compressor boost valve actuation is accomplished solely with boost pressure and free of active control circuitry or control logic in response to a mass flow through the engine causing the turbine bypass valve to completely open.

2. The system of claim 1 wherein the boost pressure after reaching the predefined pressure threshold pushes the compressor bypass valve open.

3. The system of claim 1 wherein the compressor bypass valve is a butterfly valve.

4. The system of claim 1 wherein the compressor bypass valve is a rotary valve.

5. The system of claim 1 wherein the compressor bypass valve is a single poppet valve.

6. The system of claim 1 wherein the compressor bypass valve is a dual poppet valve.

7. A vehicle comprising:
an engine;
a first turbocharger and a second turbocharger coupled to the engine, the first turbocharger being a high pressure turbocharger with a first turbine and the second turbocharger being a low pressure turbocharger with a second turbine, and further comprising a turbine bypass valve coupled to a turbine bypass around the first turbine, wherein the turbine bypass valve is controlled to open in response to a turbine speed limit being reached; and
a compressor bypass valve coupled to the first turbocharger and to the engine, the compressor bypass valve being normally closed by default and operable free of any active control logic or control circuitry to be actuated passively when acted upon by a boost pressure when the boost pressure increases above a predefined pressure threshold in response to a mass flow through the engine causing the turbine bypass valve to completely open.

8. The vehicle of claim 7 wherein the boost pressure after reaching the predefined pressure threshold pushes the compressor bypass valve open.

9. The vehicle of claim 7 wherein the compressor bypass valve is a butterfly valve.

10. The vehicle of claim 7 wherein the compressor bypass valve is a rotary valve.

11. The vehicle of claim 7 wherein the compressor bypass valve is a single poppet valve.

12. The vehicle of claim 7 wherein the compressor bypass valve is a dual poppet valve.

13. A method comprising:
providing a compressor bypass valve coupled to a first turbocharger and to an engine, wherein the first turbocharger and a second turbocharger are coupled to the engine, the first turbocharger being a high pressure turbocharger with a first turbine and the second turbocharger being a low pressure turbocharger with a second turbine, and further comprising a turbine bypass valve coupled to a turbine bypass around the first turbine;
controlling the turbine bypass valve to open in response to a speed limit of the turbine being reached; and
configuring the compressor bypass valve to be closed by default and to be actuated free of any active control logic or control circuitry when acted upon by a boost pressure when the boost pressure increases above a predefined pressure threshold in response to a mass flow through the engine causing the turbine bypass valve to completely open.

14. The method of claim 13 wherein the boost pressure after reaching the predefined pressure threshold pushes the compressor bypass valve open.

15. The method of claim 13 Wherein the compressor bypass valve is a butterfly valve.

16. The method of claim 13 Wherein the compressor bypass valve is a rotary valve.

17. The method of claim 13 wherein the compressor bypass valve is a single poppet valve.

Assignees

• Andreae Morgan
• Hoevener Marcus
• Dale Adrian
• Sujan Vivek
• Matthews Jeffrey
• Cummins Inc

Inventors

• Andreae Morgan
• Hoevener Marcus
• Dale Adrian
• Sujan Vivek
• Matthews Jeffrey

Classifications

• F02B39/00

  Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00 · CPC title

• F02M25/0728 Primary

  Mechanical Engineering · mapped topic

• F02B37/004

  with exhaust drives arranged in series · CPC title

• F02B37/16

  by bypassing charging air · CPC title

• Y02T10/121

  Cross-Sectional Technologies · mapped topic