Variable-geometry turbocharger with asymmetric divided volute for engine exhaust gas pulse optimization

Patent · 09 November 2010

OSTI ID:1014943

Serres, Nicolas ^[1]

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1. Epinal, FR

A turbine assembly for a variable-geometry turbocharger includes a turbine housing defining a divided volute having first and second scrolls, wherein the first scroll has a substantially smaller volume than the second scroll. The first scroll feeds exhaust gas to a first portion of a turbine wheel upstream of the throat of the wheel, while the second scroll feeds gas to a second portion of the wheel at least part of which is downstream of the throat. Flow from the second scroll is regulated by a sliding piston. The first scroll can be optimized for low-flow conditions such that the turbocharger can operate effectively like a small fixed-geometry turbocharger when the piston is closed. The turbine housing defines an inlet that is divided by a dividing wall into two portions respectively feeding gas to the two scrolls, a leading edge of the dividing wall being downstream of the inlet mouth.

• Research Organization: Honeywell International, Inc. (Morristown, NJ)
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-06NT42873
• Assignee: Honeywell International, Inc. (Morristown, NJ)
• Patent Number(s): 7,828,517
• Application Number: US Patent Application 11/834,115
• OSTI ID: 1014943
• Country of Publication: United States
• Language: English