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US 2015/0308359 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
Life of this patent
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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.
Claims18
A method for an engine, comprising,
- during a first cold or hot start, actuating a scroll valve coupled to an outer scroll of an exhaust turbine to a more closed position via the controller and starting the engine;
- and
- during a second, different cold or hot start, actuating the scroll valve to a more open position via the controller and starting the engine, wherein during each of the first and second cold or hot starts, an opening of an exhaust turbine wastegate bypassing the exhaust turbine is adjusted based on the adjusted position of the scroll valve.
A method for a boosted engine, comprising:
- during an engine start where a turbine speed is within a threshold range determined by a controller and based on sensed turbine resonance, actuating a scroll valve coupled to an outer scroll of a twin scroll exhaust turbine to an open position via the controller and starting the engine, and adjusting opening a wastegate via a wastegate actuator coupled across the exhaust turbine based on the open position of the scroll valve.
An engine system, comprising:
- an engine with a direct fuel injector for each cylinder;
- 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 and 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.