Prabhakar Ramalingam

US Patent:

6279843, Aug 28, 2001

Filed:

Mar 21, 2000

Appl. No.:

9/528975

Inventors:

Dana R. Coldren - Fairbury IL
Glen F. Forck - Peoria IL
Prabhakar Ramalingam - Cary NC
Trent A. Riggs - Peoria IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

B05B 130

US Classification:

2395851

Abstract:

A single pole solenoid assembly includes a coil attached to a stator that is in a fixed position relative to a body component. An armature with a centerline is positioned adjacent to the stator. A magnetic flux ring has a central axis and an interior surface that at least partially surrounds the armature. The stator, armature and magnetic flux ring are positioned and arranged such that magnetic flux line generated by the coil pass through the stator and the magnetic flux ring through the armature. The central axis and the centerline are concentrically coupled via an interaction between the magnetic flux ring and the armature via the body component. The single pole solenoid is preferably attached to valving components and incorporated as part of an electronically controlled fuel injector.

US Patent:

61678694, Jan 2, 2001

Filed:

Nov 3, 1997

Appl. No.:

8/963275

Inventors:

David E. Martin - Normal IL
Glen F. Forck - Peoria IL
Dana R. Coldren - Fairbury IL
Marvin P. Schneider - East Peoria IL
Prabhakar Ramalingam - Normal IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F02M 3704

US Classification:

123458

Abstract:

A fuel injector includes first and second valves and a solenoid including a solenoid coil and an armature assembly wherein the first and second valves are coupled to the armature assembly. A solenoid drive circuit is coupled to the solenoid coil and delivers a first current waveform portion to the solenoid coil at a first time to cause the armature assembly to operate the first valve without operating the second valve. A second current waveform portion different than the first current waveform portion is applied to the solenoid coil at a second time later than the first time to operate the second valve.

US Patent:

59842083, Nov 16, 1999

Filed:

Nov 3, 1997

Appl. No.:

8/963426

Inventors:

David E. Martin - Normal IL
James J. Streicher - Pontiac IL
Clifford J. Rebello - Normal IL
Prabhakar Ramalingam - Normal IL

Assignee:

Caterpillar Inc. - Peoria IL
Lucas Industries Public Limited Company - Solihull

International Classification:

F02M 6100

US Classification:

2395332

Abstract:

A fuel injector includes a barrel having an insert recess therein within which an insert is disposed. A facing surface of the insert is located opposite a base surface of the recess and forms a passage interconnecting a high pressure fuel passage and a valve bore. High pressure intersecting bores are thus avoided, leading to a reduction in structural failures.