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US 2014/0360184 A1Published application
Method and system for binary flow turbine control
AssigneeFord Global Technologies, LLC
InventorsJulia Helen Buckland, Amey Y. Karnik, Jeffrey Allen Doering, Brad Alan Boyer
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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,
- during a first cold or hot start condition, starting the engine with a scroll valve coupled to an outer scroll of an exhaust turbine more closed;
- and
- during a second, different cold or start condition, starting the engine with the scroll valve more open.
A method for a boosted engine, comprising:
- during selected engine start conditions, starting the engine with a scroll valve coupled to an outer scroll of an exhaust turbine open.
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 between an engine exhaust manifold an inlet of the first outer scroll;
- a wastegate included in a bypass coupled between an inlet and an outlet of the turbine;
- and
- a controller with computer readable instructions for,
- during an engine start condition, when turbine speed is lower than a threshold, starting the engine with an opening of the scroll valve increased based on the turbine speed.
4 more elements
Dependencies are inferred from the claim text.