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:
Jun. 30, 1998
Filed:
Jul. 01, 1996
Keith L Musser, Cloumbus, IN (US);
Daniel D Wilhelm, Nashville, IN (US);
David A Olson, Columbus, IN (US);
James H Ross, Cedar Falls, IA (US);
Jeffrey P Seger, Columbus, IN (US);
Michael J Ruth, Franklin, IN (US);
Prakash Bedapudi, Columbus, IN (US);
David A Bolis, Nashville, IN (US);
Stephen M Holl, Columbus, IN (US);
Gregory Weber, Rochester Hills, MI (US);
Cummins Engine Company, Inc., Columbus, IN (US);
Abstract
A system for controlling fuel flow in an internal combustion engine receives a command specifying a desired fuel flow rate from an electronic control module. The system generates a feedforward estimate of actuator current required to produce the desired flow rate. This estimate is combined with a fueling current offset value generated using a proportional-integral feedback controller. A differential pressure between the fuel rail and cylinder gas is converted, by surface interpolation based on a lookup table, to an estimate of actual fuel flow rate. The difference between this actual fuel flow rate and the desired flow rate is provided to the feedback controller as an error signal. The feedback controller preferably uses different gain values depending on an operating mode of the engine (speed control and torque control modes).