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US 11,111,862 B2Granted
Methods and systems for an engine with partial deactivation
AssigneeFord Global Technologies, LLC
InventorOliver Berkemeier
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for an engine configured to deactivate at least some cylinders. In one example, an engine system may comprise a first group of cylinders having a first compression ratio and a second group of cylinders having a second compression ratio greater than the first.
Claims11
A method comprising:
- selecting a first operating mode, a second operating mode, or a third operating mode in response to a comparison of an engine load to a first threshold and a second threshold, the second threshold being larger than the first threshold;
- activating only a first cylinder group comprising a first compression ratio during the first operating mode;
- activating both the first cylinder group comprising the first compression ratio and a second cylinder group comprising a second compression ratio during the second operating mode, the second operating mode further comprising flowing exhaust gas from at least one cylinder of the first cylinder group to at least one cylinder of the second cylinder group, such that the exhaust gas flows from the first cylinder group, through a flow transfer duct, and directly to the second cylinder group;
- and
- activating only the second cylinder group comprising the second compression ratio during the third operating mode.
2 more elements
A system comprising:
- an engine comprising a plurality of cylinders including a first cylinder, a second cylinder, a third cylinder, and a fourth cylinder, the first and fourth cylinders respectively arranged outside of the second and third cylinders, the plurality of cylinders further comprising a first cylinder group comprising the first and fourth cylinders and a second cylinder group comprising the second and third cylinders, where the first cylinder group comprises a first compression ratio and the second cylinder group comprises a second compression ratio greater than the first compression ratio;
- wherein
- the first cylinder group comprises fuel injectors positioned to inject fuel into an intake passage coupled to the first and fourth cylinders, and the second cylinder group comprises fuel injectors positioned to inject fuel directly into the second and third cylinders;
- and
- a controller with computer-readable instructions stored on non-transitory memory that when executed enable the controller to:
- activate only the first cylinder group and deactivate all cylinders of the second cylinder group in response to an engine load being less than or equal to a first threshold during a first mode;
- activate each of the first and second cylinder groups in response to the engine load being greater than a second threshold during a second mode, wherein the second mode further comprises flowing compressed gas from the first cylinder group, through flow transfer ducts, and to the second cylinder group;
- and
- activate only the second cylinder group and deactivate all cylinders of the first cylinder group in response to the engine load being greater than the first threshold and less than or equal to the second threshold during a third mode.
6 more elements
Dependencies are inferred from the claim text.