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US 2014/0360181 A1Published application
Method and system for binary flow turbine control
AssigneeFord Global Technologies, LLC
InventorsJulia Helen Buckland, Jeffrey Allen Doering, Brad Alan Boyer
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control.
Claims20
A method for an engine, comprising:
- adjusting a scroll valve coupled to an inlet of an outer scroll of a multi-scroll exhaust turbine responsive to engine dilution.
A method for an engine, comprising:
- recirculating residuals from an engine exhaust to an engine intake via an EGR system until a combustion stability limit is reached;
- and
- after the combustion stability limit is reached, reducing internal residuals by moving a scroll valve coupled to an outer scroll of a multi scroll turbine to a more open position.
An engine system, comprising:
- an engine;
- a turbocharger for providing a boosted aircharge to the engine, the turbocharger including an intake compressor and an exhaust turbine, the exhaust turbine including a first outer and a second inner scroll;
- a scroll valve coupled to an inlet of the first outer scroll;
- a wastegate included in a bypass coupled between an inlet and an outlet of the turbine;
- a first EGR passage coupled between an engine exhaust, downstream of the turbine, and an engine intake, upstream of the compressor, the first EGR passage including a first EGR valve;
- a second EGR passage coupled between the engine exhaust, upstream of the turbine, and the engine intake, downstream of the compressor, the second EGR passage including a second EGR valve;
- and
- a controller with computer readable instructions for,
- opening one or more of the first EGR valve and the second EGR valve to provide engine dilution;
- and
- upon reaching a limit, providing further engine dilution by decreasing an opening of the scroll valve.
8 more elements
Dependencies are inferred from the claim text.