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US 2017/0321614 A1Published application
Systems and methods for control of turbine-generator 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 to control exhaust energy delivered to a turbine of a turbine-generator coupled to a split exhaust engine system in order to limit turbine over-speed conditions and/or reduce generator vibration or reduce component over-heating conditions. In one example, a method may comprise in response to turbine speed greater than a threshold speed, selectively deactivating a first exhaust valve of one or more cylinders of a first and second cylinder group.
Claims20
A method for an engine, comprising:
- delivering exhaust from a first exhaust valve of all cylinders of a first cylinder group to a first scroll of an exhaust turbine while delivering exhaust from a first exhaust valve of all cylinders of a second cylinder group to a second scroll of the exhaust turbine;
- and
- delivering exhaust from a second exhaust valve of all cylinders of the first and second cylinder group to an exhaust catalyst, while bypassing the turbine.
A method for an engine, comprising:
- flowing exhaust from a first exhaust valve of all cylinders of a first cylinder group to a first scroll of an exhaust turbine;
- flowing exhaust from a first exhaust valve of all cylinders of a second cylinder group to a second scroll of the exhaust turbine, the turbine driving a generator;
- flowing exhaust from a second exhaust valve of all cylinders of the first and second cylinder group to an exhaust catalyst while bypassing the turbine;
- and
- deactivating a first cylinder pattern of individual first exhaust valve mechanisms of the first and second cylinder group responsive to turbine speed higher than a threshold speed during a first operating condition;
- and
- deactivating a second, different, cylinder pattern of individual first exhaust valve mechanisms of the first and second cylinder group responsive to turbine speed higher than the threshold speed during a second operating condition different than and mutually exclusive from the first condition.
4 more elements
An engine system comprising:
- an engine including an exhaust manifold with an exhaust catalyst;
- an exhaust turbine with a first and a second scroll, the turbine driving a generator;
- a first cylinder group with a first cylinder, the first cylinder including a first and a second exhaust valve, the first exhaust valve selectively deactivatable;
- a second cylinder group with a second cylinder, the second cylinder including a first and a second exhaust valve, the first exhaust valve selectively deactivatable;
- a first passage coupling the first exhaust valve of the first cylinder to a first scroll of the turbine;
- a second passage coupling the first exhaust valve of the second cylinder to the second scroll of the turbine;
- a third passage coupling the second exhaust valve of each of the first and second cylinder to an exhaust catalyst, bypassing the turbine, the exhaust catalyst positioned downstream of the turbine;
- and
- a controller with computer readable instructions stored on non-transitory memory for:
- operating in a first mode with the first exhaust valve of the first and the second cylinder activated;
- operating in a second mode with the first exhaust valve of one of the first cylinder and the second cylinder deactivated;
- operating in a third mode with the first exhaust valve of each of the first and the second cylinder deactivated;
- and
- transitioning between modes based on one or more of exhaust system temperature and turbine speed.
11 more elements
Dependencies are inferred from the claim text.