Device for controlling an internal combustion engine

US7284545B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Gerd Rösel · Dresden, DE
• Hong Zhang · Tegernheim, DE

Key dates

• Filing date: Nov 10, 2004
• Grant date: Oct 23, 2007
• Expiry date: Nov 10, 2024

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/1419
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a device for controlling an internal combustion engine, comprising a first regulator, whose regulating difference is the difference of an actual value and an estimated value of individual cylinder deviation of the air/fuel ratio from a preset air/fuel ratio. The first regulator also has an integral regulating parameter, its manipulated variable being a first estimated value. A second regulator is also provided, the regulating difference of which is the first estimated value. Said regulator has a proportional regulating parameter whose manipulated variable is an individual cylinder lambda regulating factor. A PT1 filter is additionally provided, by means of which a second estimated value is determined through PT1 filtering of the individual cylinder lambda regulating factor. A unit is also provided, said unit determining the estimated value of the individual cylinder deviation of the air/fuel ratio from the preset air/fuel ratio based on the difference between the first and the second estimated values. Depending on the individual cylinder lambda regulating factor, a fuel mass that is to be proportioned is corrected and the thus corrected fuel mass to be prop…