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:
Nov. 26, 2002
Filed:
Apr. 26, 2002
Manabu Hasegawa, Yokohama, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A fuel injection control apparatus for a diesel engine ( ) is provided that eliminates a torque step occurring when shifting from a pilot fuel injection mode to a normal injection mode. After finding a total fuel injection quantity QFIN per cycle (block ), a pilot fuel injection quantity QPILOTB is subtracted therefrom to determine a pilot fuel injection quantity QPILOT and a main fuel injection quantity QMAIN (block ). Corrected pilot fuel injection quantity QPILOTF and corrected main fuel injection quantity QMAINF are determined using a fuel temperature correction coefficient KQTHF and a pilot fuel injection thermal efficiency CEHPILOT (block ) and a main fuel injection thermal efficiency CEHMAIN (block ). The thermal efficiencies are established based on the respective injection timings. A change in torque does not occur because the change in the thermal efficiency caused by the injection timing is offset.