Patent · US Active

Method for detecting preinjection

US7493887B2 · kind B2 · utility

1Cited by

4References

13Claims

0Family size

Assignee

MTU FRIEDRICHSHAFEN GMBH · DE

Inventors

Albert Kloos · Friedrichshafen, DE
Andreas Kunz · Ladenburg, DE
Gunther Schmidt · Biberach, DE
Ralf Speetzen · Friedrichshafen, DE
Michael Willmann · Bermatingen, DE

Key dates

Filing date	Jul 25, 2007
Grant date	Feb 24, 2009
Priority date	—
Expiry date	Jul 25, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A method for detecting a preinjection in an internal combustion engine with a common-rail system, including individual accumulators, in which an individual accumulator pressure distribution is detected in a measurement interval and is used to determine an injection end of the main injection, in which a virtual injection start of the main injection is computed by a mathematical function as a function of the injection end, and in which the virtual injection start is set as the actual injection start of the main injection. With the preinjection activated, an actual injection delay for the main injection is determined as a function of the actual injection start, an injection delay deviation of a set injection delay from the actual injection delay is computed, and the injection delay deviation is used to determine whether a preinjection has occurred.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.