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US 2014/0360182 A1Published application
Method and system for binary flow turbine control
AssigneeFord Global Technologies, LLC
InventorsBrad Alan Boyer, Julia Helen Buckland, Stephen Lee Cooper, Jeffrey Allen Doering, Barbara Westrate, Keith Michael Plagens
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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:
- in response to a cold-start condition, adjusting a scroll valve coupled to an inlet of one scroll of a multi-scroll exhaust turbine to expedite catalyst warm-up.
A method for a boosted engine, comprising:
- during an engine cold-start condition, starting the engine with a scroll valve coupled to an outer scroll of an exhaust turbine less open for a first, larger number of combustion events;
- and
- during an engine hot-start condition, starting the engine with the scroll valve more open for a second, smaller number of combustion events.
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 cold-start condition, starting the engine with an opening of the scroll valve adjusted responsive to exhaust temperature for a number of cylinder events since a first combustion event.
4 more elements
Dependencies are inferred from the claim text.