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. 28, 2006
Filed:
Jul. 06, 2004
Armin Doelker, Immenstaad, DE;
Armin Doelker, Immenstaad, DE;
MTU Friedrichshafen GmbH, Friedrichshafen, DE;
Abstract
Proposed is a method for controlling an internal combustion engine () with a common-rail injection system and a high-pressure control loop. In this method, a pump with an intake throttle () is controlled by means of an electronic control device () using a PWM signal with a first frequency. The invention provides that a critical speed is calculated from the angular distance between injections and the first frequency of the PWM signal. A speed range is then determined as a function of the critical speed. For engine speed values that fall outside this speed range, the PWM signal is set to the first frequency. For engine speed values that fall within the speed range, the PWM signal is set to a second frequency. Switching the PWM signal reduces the pressure oscillations in the rail ().