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US 8,897,995 B2Granted
Method for controlling fuel injection for a dual fuel engine
AssigneeFord Global Technologies, LLC
InventorEric Kurtz
Life of this patent
Estimating the term…
Abstract
A fuel injection system including injectors for two different fuels is disclosed. In one example, fuel injection is adjusted to compensate for changes in engine intake air amount. Combustion stability during transient conditions may be improved.
Claims21
An engine operating method, comprising:
- during a transition where EGR changes greater than a threshold:
- increasing an amount of a first fuel with a first reactivity injected to a cylinder in response to an engine intake oxygen concentration error;
- and
- decreasing an amount of a second fuel with a second reactivity injected to the cylinder in response to the engine intake oxygen concentration error;
- and
- compression igniting the first and second fuels in the cylinder.
3 more elements
An engine operating method, comprising:
- during a transition where air-charge changes greater than a threshold:
- increasing an amount of a first fuel with a first reactivity injected to a cylinder in response to an engine intake oxygen concentration error;
- and
- decreasing an amount of a second fuel with a second reactivity injected to the cylinder in response to the engine intake oxygen concentration error;
- and
- compression igniting the first and second fuels in the cylinder.
3 more elements
An engine operating method, comprising:
- transitioning from a first engine operating state to a second engine operating state where boost changes by more than a threshold;
- adjusting an amount and timing of a first fuel with a first reactivity injected to a cylinder to a level more or less than is scheduled for steady state operating conditions between the first and second engine operating states;
- and
- adjusting an amount of a second fuel with a second reactivity injected to the cylinder to a level more or less than is scheduled for steady state operating conditions between the first and second engine operating states, a direction of the amount of the second fuel injected opposite a direction of the amount of the first fuel injected, the second reactivity less than the first reactivity;
- where an adjustment amount of the first fuel with a first reactivity is based on a boost error.
2 more elements
Dependencies are inferred from the claim text.