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US 2013/0152903 A1Published application
Method and system for improving engine starting
AssigneeFord Global Technologies, LLC
InventorsThomas G. Leone, Ross Dykstra Pursifull, Joseph Norman Ulrey, Donald J. Lewis
Life of this patent
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Abstract
An engine system and method for improving engine starting are disclosed. In one example, engine port throttles are adjusted to improve fuel vaporization of a fuel that includes alcohol. The system and method may improve engine starting and emissions.
Claims20
A method of starting an engine, comprising:
- substantially closing a port throttle of a cylinder;
- and
- injecting at least a portion of an amount of fuel to a cylinder during a cylinder cycle while the port throttle is substantially closed, the amount of fuel injected being during an interval that includes a middle position which is substantially aligned with a predetermined vacuum level of the cylinder.
A method of starting an engine, comprising:
- substantially closing a port throttle of a cylinder during a cylinder cycle;
- at least partially opening the port throttle before IVC during the cylinder cycle after substantially closing the port throttle and after beginning to inject a fuel to the cylinder during the cylinder cycle;
- and
- substantially closing the port throttle after an intake valve of the cylinder closes.
1 more element
A system for controlling an engine, comprising:
- an engine air intake throttle located along an engine air intake passage;
- a first engine cylinder port throttle located along the engine air intake passage downstream of the engine air intake throttle;
- a first fuel injector located downstream of the first engine cylinder port throttle;
- a cylinder receiving a fuel via the first fuel injector and air via the first engine cylinder port throttle;
- and
- a controller including instructions for injecting substantially a same amount of fuel before and after a predetermined vacuum level of the cylinder is reached during a cycle of the cylinder, and including additional instructions for opening the first engine cylinder port throttle after the first fuel injector begins to inject fuel during the cycle of the cylinder.
3 more elements
Dependencies are inferred from the claim text.