The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 08, 2002
Filed:
May. 28, 1999
Timothy Andrew Suder, Greencastle, PA (US);
Mack Trucks, Inc., Allentown, PA (US);
Abstract
A method and apparatus for rate shaping a fuel injection profile in a diesel engine. The system includes a fuel injector having a pump chamber, a fuel injecting plunger, a supply line, and a discharge nozzle. A rotation of a camshaft causes reciprocation of the plunger and movement of fuel from the supply line through the chamber to the corresponding cylinder. A spill valve is positioned between the chamber and the nozzle, the valve having a first position providing a maximum fuel injection rate, a second position providing a substantially zero fuel injection rate, and at least one intermediate position providing an intermediate fuel injection rate. The method includes the steps of pressurizing fuel fed to a fuel injector nozzle, partially opening a spill valve communicating with the fuel injector nozzle so that the fuel injector injects fuel into a corresponding engine cylinder at a first fuel injection rate for a predetermined first period of time during an engine fuel injection cycle, and fully opening the spill valve so that the fuel injector injects fuel into the corresponding engine cylinder at a second fuel injection rate for a remainder of the engine fuel injection cycle, wherein the first injection rate and the second injection rate shape a fuel flow rate of injected fuel.