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. 23, 2015
Filed:
Dec. 12, 2011
Michael A. Snopko, Washington, IL (US);
Rajesh N. Nair, Peoria, IL (US);
Frederic Fugere, Chillicothe, IL (US);
Andrew A. Knitt, Deer Creek, IL (US);
Anthony C. Rodman, Langtoft, GB;
Michael A. Snopko, Washington, IL (US);
Rajesh N. Nair, Peoria, IL (US);
Frederic Fugere, Chillicothe, IL (US);
Andrew A. Knitt, Deer Creek, IL (US);
Anthony C. Rodman, Langtoft, GB;
Caterpillar Inc., Peoria, IL (US);
Abstract
Operating an exhaust particulate filter system for an internal combustion engine includes transmitting electromagnetic energy, for example having a frequency above about 2 GHz, through an exhaust particulate filter containing trapped soot. The transmitted electromagnetic energy may be attenuated in response to the trapped soot, and a filter soot loading value calculated based at least in part upon a correlation among an attenuation of the electromagnetic energy, a temperature of the filter, and a mass of the trapped soot. An algorithm based upon a partial derivative of an equation representing the correlation may be used in calculating the filter soot loading value, and a resulting soot mass. The calculated soot mass is used to determine a relative soot loading state of the filter in conjunction with information as to ash loading. Responsive to determining the relative soot loading state satisfies regeneration suitability conditions, a regeneration initiation command may be outputted.