Systems and methods for control of turbine-generator via valve deactivation in a split exhaust engine system
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Joseph Norman Ulrey
Life of this patent
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Abstract
Methods and systems are provided for reducing exhaust energy delivered to a turbine of a turbine-generator coupled to a split exhaust engine system in order to reduce turbine over-speed conditions and/or to reduce a generator output. In one example, a method may include deactivating a blowdown exhaust valve utilized to deliver a blowdown portion of exhaust energy to the turbine.
Claims20
A method for an engine, comprising:
- delivering exhaust from a first exhaust valve of a cylinder to an exhaust turbine via a first exhaust manifold, the turbine driving a generator;
- delivering exhaust from a second exhaust valve of the cylinder to an exhaust catalyst while bypassing the turbine via a second exhaust manifold;
- and
- selectively deactivating the first exhaust valve in response to a turbine speed greater than a threshold turbine speed.
A method for an engine including a first exhaust passage directly coupled to a turbine generator and a second exhaust passage directly coupled to an exhaust catalyst, an outlet of the turbine coupled to the catalyst via a third exhaust passage, comprising:
- flowing exhaust gas to the turbine via a first exhaust valve, the first exhaust valve coupling an engine cylinder to the first exhaust passage via a first exhaust manifold;
- flowing exhaust gas to the catalyst via a second exhaust valve, the second exhaust valve coupling the engine cylinder to the second exhaust passage via a second exhaust manifold;
- and
- in response to a speed of the turbine greater than a threshold speed,
- selectively deactivating the first exhaust valve on a number of cylinders.
A system comprising:
- an engine cylinder;
- a first exhaust valve for delivering an initial portion of exhaust gas from the cylinder to a turbine-generator via a first exhaust passage;
- a second exhaust valve for delivering a latter portion of exhaust gas from the cylinder to an exhaust catalyst located downstream of the turbine-generator via a second exhaust passage separate from the first exhaust passage, an outlet of the turbine-generator coupled to the exhaust catalyst via a third passage;
- a valve actuator configured to deactivate the first exhaust valve;
- and
- a controller with computer readable instructions for:
- deactivating the first exhaust valve in response to a generator output greater than a threshold output.
Dependencies are inferred from the claim text.