Patent · US Expired

Method for determining the injection time in a direct-injection internal combustion engine

US6311669A · kind A · utility

18Cited by

9References

8Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Achim Przymusinski · Regensburg, DE
Thomas Rader · Mercer Island, US
Ralf Schernewski · Stuttgart, DE

Key dates

Filing date	Sep 18, 2000
Grant date	Nov 6, 2001
Priority date	—
Expiry date	Sep 18, 2020

Classification

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

Abstract

Pressure fluctuations occurring during two sequential injections (for example a pre-injection and a main injection) within a working cycle of a cylinder in a lead to the injector are taken into account with the aid of a correction term. A drive time of the injectors is determined with the aid of a corrected pressure so that a desired fuel quantity is injected. The correction term is determined with the aid of a least-squares estimator that estimates the injection pressure at the nozzle of injector as a function of the geometrical data of the system, in particular a length of the lead from the rail to the injector and physical boundary conditions, for example a fuel temperature.

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