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:
Jan. 27, 2004
Filed:
Jan. 08, 2003
Michael A. Majewski, Joliet, IL (US);
James T. Beaucaire, Glen Ellyn, IL (US);
International Engine Intellectual Property Company, LLC, Warrenville, IL (US);
Abstract
A control strategy for mitigation of the effect of increased engine back-pressure on fuel injectors ( ) when an engine retarder is activated to slow the engine ( ) of a motor vehicle. The strategy attenuates injection control pressure ICP of hydraulic fluid for the fuel injectors to a defined dwell pressure ICP_VRE_DWL, and once that dwell pressure has been attained, keeps the injection control pressure from exceeding it for the length of a dwell time ICP_DWL_TM. Upon elapse of the dwell time, the injection control pressure gradually increases above the dwell pressure using a pressure versus time map ( ). When engine operating conditions call for greater injection control pressure while the retarder is activated, the strategy provides for greater injection control pressure using a pressure versus speed map ( ).