Diesel engine emissions reduction by multiple injections having increasing pressure
AssigneeWisconsin Alumni Research Foundation
InventorsRolf D. Reitz, Matthew P. Thiel
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Abstract
Multiple fuel charges are injected into a diesel engine combustion chamber during a combustion cycle, and each charge after the first has successively greater injection pressure (a higher injection rate) than the prior charge. This injection scheme results in reduced emissions, particularly particulate emissions, and can be implemented by modifying existing injection system hardware. Further enhancements in emissions reduction and engine performance can be obtained by using known measures in conjunction with the invention, such as Exhaust Gas Recirculation (EGR).
Claims20
A method of diesel engine fuel injection comprising injecting a sequence of at least two fuel charges into an engine cylinder during a diesel combustion cycle, the sequence beginning with an initial fuel charge, wherein the fuel charge succeeding the initial fuel charge is injected at higher pressure than the initial fuel charge.
A method of diesel engine fuel injection comprising:
- a. injecting a first fuel charge into a combustion chamber of a diesel engine at a first flow rate;
- b. after injection of the first fuel charge has ended, injecting a second fuel charge into the combustion chamber at a second flow rate greater than the first flow rate,
- wherein the first and second fuel charges are both injected into the combustion chamber during the same combustion cycle.
A method of diesel engine fuel injection comprising injecting multiple fuel charges into a combustion chamber during a combustion cycle, wherein each successive fuel charge is injected at higher pressure than the previous fuel charge.
Dependencies are inferred from the claim text.