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US 2014/0360185 A1Published application
Method and system for binary flow turbine control
AssigneeFord Global Technologies, LLC
InventorsBrad Alan Boyer, Julia Helen Buckland, Jeffrey Allen Doering, Barbara Westrate, Stephen Lee Cooper, 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 an indication of pre-ignition, adjusting a scroll valve coupled to an inlet of outer scroll of a multi-scroll exhaust turbine to a first open position;
- and
- in response to an indication of knock without pre-ignition, adjusting the scroll valve to a second open position, the second position less open than the first position.
A method for a boosted engine, comprising:
- in response to an indication of pre-ignition, opening a scroll valve coupled to an outer scroll of an exhaust turbine to reduce engine load.
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;
- a knock sensor coupled to the engine for identifying and differentiating cylinder knock and cylinder pre-ignition;
- and
- a controller with computer readable instructions for,
- indicating cylinder pre-ignition based on an output of the knock sensor;
- and
- in response to the indication of pre-ignition, increasing an opening of the scroll valve based on turbine inlet temperature.
7 more elements
Dependencies are inferred from the claim text.