Fuel-based injection control
AssigneeFord Global Technologies, LLC
InventorsEric Krengel, Peter C. Moilanen, Gopichandra Surnilla
Life of this patent
Estimating the term…
Abstract
Systems and methods of operating an engine with a varying fuel composition. In one example, a split injection is performed during engine cranking with at least some fuel injected in the intake stroke and some fuel injected in the compression stroke. Further, a split ratio of the injection is adjusted based on the alcohol content of the injected fuel.
Claims18
A method of operating an engine cylinder including a direct fuel injector, comprising,
- during an engine cold start,
- direct injecting at least some fuel in a compression stroke of the engine and at least some fuel in an intake stroke of the engine;
- and
- decreasing a ratio of intake stroke fuel to compression stroke fuel as an alcohol content of the injected fuel increases;
- and
- transitioning to a single fuel injection.
A method of operating an engine including an injector configured to directly inject fuel into an engine cylinder, comprising:
- during a first engine cold start, direct injecting a first fuel in an intake stroke of the engine and a compression stroke of the engine at a first split ratio of intake stroke fuel to compression stroke fuel;
- and
- during a second engine cold start, direct injecting a second fuel in the intake stroke of the engine and the compression stroke of the engine at a second, lower split ratio of intake stroke fuel to compression stroke fuel, the second fuel having a higher alcohol content than the first fuel;
- and
- transitioning to a single fuel injection while adjusting turbocharger boost.
A method of operating an engine cylinder including a direct fuel injector, comprising,
- during an engine cold start,
- direct injecting at least some fuel in a compression stroke of the engine and at least some fuel in an intake stroke of the engine;
- and
- decreasing a ratio of intake stroke fuel to compression stroke fuel as an alcohol content of the injected fuel increases;
- and
- transitioning to a single fuel injection while adjusting spark timing.
Dependencies are inferred from the claim text.