In-cylinder air injection via dual-fuel injector
AssigneeCummins Inc.
InventorsJ. Steven Kolhouse, Anthony Kyle Perfetto
Life of this patent
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Abstract
A fueling system is provided, comprising: a pressurized air source; a liquid fuel source; a dual injector coupled to the pressurized air source and the liquid fuel source, the dual injector being mounted to inject pressurized air from the pressurized air source and liquid fuel from the liquid fuel source into a combustion chamber of an engine cylinder; and a controller in communication with the dual injector, the controller being configured to cause the dual injector to inject pressurized air directly into the combustion chamber.
Claims15
A fueling system, comprising:
- a pressurized air source;
- a liquid fuel source;
- a dual injector coupled to the pressurized air source and the liquid fuel source, the dual injector being mounted to directly inject pressurized air from the pressurized air source and liquid fuel from the liquid fuel source into a combustion chamber of an engine cylinder;
- and
- a controller in communication with the dual injector, the controller being configured to cause the dual injector to inject pressurized air directly into the combustion chamber to achieve a desired air/fuel ratio.
A method of diluting an EGR percentage in an engine cylinder, comprising:
- determining a desired EGR percentage to be provided to the cylinder by an EGR system;
- determining a nominal fuel injection for an engine cycle;
- determining a nominal amount of air available to the cylinder via an intake valve coupled to the cylinder for the engine cycle;
- determining a required amount of pressurized air needed to achieve the desired EGR percentage;
- and
- controlling a dual injector to inject the amount of pressurized air into the cylinder to achieve the desired EGR percentage.
A method of diluting an EGR percentage in an engine cylinder, comprising:
- determining a fixed EGR percentage provided to the cylinder by an EGR system;
- determining whether the fixed EGR percentage is greater than a desired EGR percentage;
- and
- responding to the fixed EGR percentage being greater than the desired EGR percentage by causing a dual injector to inject a quantity of compressed air into the cylinder to dilute the fixed EGR percentage.
A fueling system, comprising:
- a pressurized air source;
- a liquid fuel source;
- a dual injector coupled to the pressurized air source and the liquid fuel source, the dual injector being mounted to inject pressurized air from the pressurized air source and liquid fuel from the liquid fuel source into a combustion pre-chamber in flow communication with an engine cylinder;
- and
- a controller in communication with the dual injector, the controller being configured to cause the dual injector to inject pressurized air into the combustion pre-chamber to enhance flame propagation to a main combustion chamber of the cylinder.
A fueling system, comprising:
- a pressurized air source;
- a liquid fuel source;
- a dual injector coupled to the pressurized air source, the dual injector being mounted to inject pressurized air from the pressurized air source into an intake port of a cylinder an engine;
- and
- a controller in communication with the dual injector, the controller being configured to cause the dual injector to inject pressurized air into the intake port.
Dependencies are inferred from the claim text.