Method for cylinder equalization of an internal combustion engine

US11118520B2 · kind B2 · utility

Assignee

• VOLKSWAGEN AKTIENGESELLSCHAFT · DE

Inventors

• Andre Shurkewitsch · Calberlah, DE
• Robert Wetten · Berlin, DE
• Elmar Millich · Berlin, DE
• Jan Vogelsang · Braunschweig, DE
• Nikolaus Zimbalist · Edemissen, DE
• Heiko Sternberg · Wolfsburg, DE

Key dates

• Filing date: Aug 28, 2020
• Grant date: Sep 14, 2021
• Expiry date: Aug 28, 2040

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02P5/14
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and control unit for cylinder equalization of an internal combustion engine having at least two cylinders, and includes the following steps: Determination of exhaust gas back pressure values of the individual cylinders over at least two operating cycles, correlation of the exhaust gas back pressure values with the camshaft position and/or the operating cycle, determination of the exhaust gas back pressure maxima for each cylinder, comparison of the exhaust gas back pressure maxima between the individual cylinders and detection of differences, adjustment of the cylinder-specific charge quantities of fresh air and/or fuel. In addition, the invention relates to a controller for carrying out the method and a motor vehicle having such a controller. The method improves the previously known methods and makes them more efficient, especially with regard to the efficiency of the combustion process and thus also of exhaust-gas aftertreatment.