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US 2012/0041665 A1Published application
Method for operating an internal combustion engine with gas as a fuel
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Ulrich Kramer
Life of this patent
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Abstract
A method for operating an internal combustion engine is provided. The method comprises, during low and medium load conditions, introducing fuel from a fuel tank by intake pipe injection into at least one intake air line coupled to at least one cylinder, and during high load conditions, introducing the fuel from the fuel tank by direct injection into the at least one cylinder. In this way, the method of fuel delivery may be optimized based on the load conditions.
Claims20
A method for operating an internal combustion engine, comprising:
- during low and medium load conditions, introducing fuel from a fuel tank to at least one cylinder of the engine by intake pipe injection into at least one intake air line coupled to the at least one cylinder, the fuel in the fuel tank comprising gaseous or liquefied gaseous fuel;
- and
- during high load conditions, introducing the fuel from the fuel tank to the at least one cylinder by direct injection into the at least one cylinder.
An engine method, comprising:
- when engine load is below a threshold, introducing a first fuel in gaseous phase to the engine;
- and
- when engine load is above the threshold, introducing the first fuel in liquid phase to the engine, the fuel in gaseous or liquid phase introduced to the engine via one or more common injectors.
An engine method, comprising:
- when engine load is below a threshold, injecting gaseous fuel by intake pipe injection into at least one intake air line coupled to at least one cylinder;
- when engine load is above the threshold, injecting liquid fuel by direct injection into the at least one cylinder;
- and
- injecting liquid fuel by direct injection into the at least one cylinder in response to cylinder knocking, even when load is below the threshold.
1 more element
Dependencies are inferred from the claim text.