Method for evaluating the march of pressure in a combustion chamber

US6276319A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus Walter · Paderborn, DE
• Holger Bellmann · Ludwigsburg, DE

Key dates

• Filing date: Mar 23, 2000
• Grant date: Aug 21, 2001
• Expiry date: Mar 23, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/001
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for evaluating the combustion chamber pressure in an internal combustion engine is described, in which the output signal of at least one cylinder pressure sensor and one crankshaft angle sensor is performed by the control unit of the engine. By analysis of the course of combustion chamber pressure over the crankshaft angle, characteristic pressure courses are obtained for certain valve control times. From these characteristic pressure courses, a conclusion can be drawn as to the valve control times "outlet opens", "outlet closes", "inlet opens", and "inlet closes", referred to the crankshaft angle.