Crossover exhaust duct with front inside passage and rear outside passage

• US 8,201,405 B2
• Filed: 12/18/2008
• Issued: 06/19/2012
• Est. Priority Date: 12/18/2008
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Bruce, Timothy Alan, Karim, Anwarul, Thompson, Scott Allen, Griffith, Robert Charles Jr.
• Primary Examiner(s): Leung, Quyen
• Assistant Examiner(s): Andrews, Michael
• Application Number:
  US12/337,832
• Publication Number:
  US 20100154416A1
• Time in Patent Office: 1,279 Days
• Field of Search: 606/052, 606/02, 603/21, 603/22, 603/23, 603/24
• US Class Current: 60/605.2
• CPC Class Codes: F01N 13/10 of exhaust manifolds with cooling jacket F01N3/046
• CPC Class Codes: F02B 29/0425 Air cooled heat exchangers
• CPC Class Codes: F02B 29/0437 Liquid cooled heat exchangers
• CPC Class Codes: F02B 37/16 by bypassing charging air
• CPC Class Codes: F02B 37/18 by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
• CPC Class Codes: F02M 26/05 High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
• CPC Class Codes: F02M 26/14 in relation to the exhaust system
• CPC Class Codes: F02M 26/23 Layout, e.g. schematics
• CPC Class Codes: F02M 26/43 in which exhaust from only one cylinder or only a group of cylinders is directed to the intake of the engine
• CPC Class Codes: F02M 26/45 Sensors specially adapted for EGR systems
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A crossover for ducting exhaust produced by an engine. The crossover includes a front inside passage and rear outside passage. The front inside passage is configured to direct exhaust from one or more cylinders associated with a front of the engine to an inside volute of a turbocharger turbine. The rear outside passage is configured to direct exhaust from one or more cylinders associated with a rear of the engine to an outside volute of the turbocharger turbine. The inside volute is closer to the rear of the engine than the outside volute is.

Claims

1. A crossover for ducting exhaust produced by an engine comprising:

a front inside passage configured to direct exhaust from one or more cylinders associated with a front of the engine to an inside volute of a turbocharger turbine;

a rear outside passage configured to direct exhaust from one or more cylinders located nearer to a rear of the engine than the one or more cylinders associated with the front of the engine to an outside volute of the turbocharger turbine; and

wherein the inside volute is closer to the rear of the engine than the outside volute.

2. The crossover of claim 1 wherein:

the front inside passage receives exhaust from a front manifold associated with the front of the engine; and

the rear outside passage receives exhaust from a rear manifold associated with the rear of the engine.

3. The crossover of claim 2 further including:

a exhaust gas recirculation (EGR) circuit fluidly coupled to the front manifold.

4. The crossover of claim 1 contained in a center manifold configured to receive exhaust from one or more engine cylinders.

5. The crossover of claim 1 wherein the front inside passage and rear outside passage are configured to deliver exhaust to a balance valve that regulates flow of exhaust between the inside volute and outside volute.

6. The crossover of claim 1 wherein the front inside passage and rear outside passage empty into a common manifold flange.

7. The crossover claim 1 wherein the front inside passage and rear outside passage are formed with a single casting.

8. A method of directing exhaust produced from an engine comprising:

passing exhaust through a front inside passage from one or more cylinders associated with a front of the engine to an inside volute of a turbocharger turbine; and

passing exhaust through a rear outside passage from one or more cylinders located nearer to a rear of the engine than the one or more cylinders associated with the front of the engine to an outside volute of the turbocharger turbine;

wherein the inside volute is closer to the rear of the engine than the outside volute.

9. The method of claim 8 wherein the front inside passage crosses the rear outside passage.

10. The method of claim 8 further including:

passing exhaust through a front manifold before the front inside passage; and

passing exhaust through a rear manifold before the rear outside passage.

11. The method of claim 10 further including:

passing a portion of the exhaust in the front manifold through a exhaust gas recirculation circuit.

12. The method of claim 8 further including:

passing the exhaust through the front inside passage and rear outside passage in a common center manifold.

13. The method of claim 8 further including:

passing the exhaust from the front inside passage and rear outside passage through a balance valve that regulates flow of exhaust between the inside volute and outside volute.