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:
May. 06, 2003
Filed:
Mar. 02, 2001
Julius P. Perr, Columbus, IN (US);
J. Victor Perr, Greenwood, IN (US);
Lester L. Peters, Columbus, IN (US);
Donald J. Benson, Columbus, IN (US);
John T. Carroll, III, Columbus, IN (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
An improved closed nozzle injector assembly for injecting high pressure fuel into the combustion chamber of an engine is provided which includes a first needle valve element associated with a first set of injector orifices, a first needle valve control device for controlling the opening and closing of the first needle valve, a second needle valve associated with a second set of injector orifices and a second needle valve control device for controlling the opening and closing of the second needle valve. Each needle valve control device includes a control volume positioned at one end of the respective needle valve, a control volume charge circuit for supplying high pressure fuel to the respective control volume and the respective injection control valve for controlling the flow of high pressure fuel from the respective control volume to a low pressure drain thereby controlling the movement of the respective needle valve. Using a dedicated control volume and injection control valve for each needle valve element permits effective control over the duration of pilot and post fuel injection events while also providing variable rate shaping capability for optimized emissions and fuel economy. The present dual needle valve element injector includes various components such as biasing springs which are positioned and interconnected to other components in a manner which creates a simple, compact fuel injector package providing independent control of two sets of spray orifices in one injector.