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:
Apr. 12, 2005
Filed:
Sep. 15, 2003
Benjamin D. Ellies, Ann Arbor, MI (US);
Mark E. Johnston, Highland, MI (US);
Guojun Shi, Canton, MI (US);
Michael Denny Parr, Highland, MI (US);
Benjamin D. Ellies, Ann Arbor, MI (US);
Mark E. Johnston, Highland, MI (US);
Guojun Shi, Canton, MI (US);
Michael Denny Parr, Highland, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
Methods and apparatus for accurately predicting a fuel injector tip temperature (FITT) are described. One technique for predicting the temperature of a fuel injector tip in an engine suitably includes the steps of estimating an initial temperature of the fuel injector tip and calculating a steady state temperature of the fuel injector tip. A filter coefficient is determined as a function of a rate of airflow into the engine, and the temperature of the fuel injector tip is predicted as a function of said initial temperature, the steady state temperature, and the filter coefficient. In a further embodiment, the steady state temperature is filtered into a feedback temperature at a rate that is determined by the filter coefficient.