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:
Mar. 13, 2007
Filed:
Dec. 11, 2001
Jeremy J. Wilson, Peoria, IL (US);
Eric E. Sollenberger, Brimfield, IL (US);
Jeremy J. Wilson, Peoria, IL (US);
Eric E. Sollenberger, Brimfield, IL (US);
Caterpillar Inc., Peoria, IL (US);
Abstract
In common rail fuel injection systems, a sensed rail pressure is used to determine control signals to produce desired injection characteristics. Because rail pressure fluctuates, especially during cold start procedures, and because the rail pressure must be sensed before the injection event to be controlled, the accuracy of the timing and quantity of the injection event can be compromised if the rail pressure at the start of the injection event is different from the sensed rail pressure. In order to produce more accurate fuel injection characteristics, the rail pressure is sensed after the end of control signal for an immediately preceeding injection event but at least a predetermined time before the start of control signal for a succeeding injection event. Since the rail pressure is sensed close in time to the succeeding injection event but with adequate time to do control signal determination calculations, the accuracy in quantity and timing of the succeeding injection event can be improved because the quality of the sensed rail pressure is improved.