Methods and systems for multi-fuel engine
AssigneeTransportation IP Holdings, LLC
InventorsAdam Klingbeil, Thomas Michael Lavertu
Life of this patent
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Abstract
Methods and systems are provided for adjusting a location of a fuel injection in response to a substitution rate and a desired EGR flow. In one example, a method may include injecting a first fuel to a combustion chamber via a direct injector positioned to inject directly into the combustion chamber, injecting a second, different, fuel to the combustion chamber via an exhaust port injector positioned to inject toward an exhaust valve of the combustion chamber, and combusting the first and second fuels together in the combustion chamber.
Claims20
A method, comprising:
- injecting a first fuel to a combustion chamber via a direct injector positioned to inject the first fuel directly into the combustion chamber;
- injecting a different, second fuel to the combustion chamber via an exhaust port injector positioned to inject the second fuel toward, or proximate to, an exhaust valve of the combustion chamber;
- and
- adjusting an exhaust gas recirculation (EGR) routing, or amount of exhaust gas supplied into the combustion chamber, based at least in part in response to an ignitability value of a combustion mixture comprising at least the first fuel, the second fuel, and air.
A system, comprising:
- a first fuel system configured to supply a first fuel directly into a combustion chamber;
- a second fuel system configured to supply a second fuel from outside of the combustion chamber and subsequently into the combustion chamber;
- and
- a controller with instructions stored on non-transitory memory that when executed cause the controller to:
- determine a substitution ratio based at least in part on an engine load and an exhaust gas recirculation (EGR) demand;
- and
- adjusting an exhaust valve timing to control an ignitability value of a combustion mixture comprising the first fuel and the second fuel.
A system of a vehicle, comprising:
- an engine comprising a cylinder including at least one intake valve and at least one exhaust valve;
- a first fuel system operable to deliver a first fuel to the cylinder via a direct injector;
- a second fuel system operable to deliver a second fuel to the cylinder via a second fuel injector located at a different intake system section from the direct injector, and an exhaust gas recirculation (EGR) portion of an exhaust system that is configured to provide exhaust gas to the cylinder;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- select a substitution ratio of the first fuel relative to the second fuel based at least in part on an engine load;
- and
- adjust an EGR routing, or an amount of exhaust gas for an injection with the second fuel, in at least partial response to an ignitability value of a combustion mixture in the cylinder that includes the first fuel and the second fuel.
Dependencies are inferred from the claim text.