Method and system for controlling an internal combustion engine

US7607417B2 · kind B2 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Erwin Achleitner · Obertraubling, DE
• Martin Cwielong · Regensburg, DE
• Gerhard Eser · Munich, DE

Key dates

• Filing date: Feb 4, 2005
• Grant date: Oct 27, 2009
• Expiry date: Feb 4, 2025

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M59/34
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and system for controlling an internal combustion engine is provide. The engine has a fuel-supply device, a low-pressure circuit and a high-pressure pump, to which a control valve for a volumetric flow is allocated is provided. Said pump is coupled on the inlet side to the low-pressure circuit and transports fuel to a fuel accumulator. An estimated value of the drive torque of the high-pressure pump is determined in accordance with the fuel pressure in the fuel accumulator. A loss torque is determined in accordance with the estimated value for the drive torque of the high-pressure pump and additional loss-torque fractions, which are dependent on a motor speed and additional operating variables. A target torque is determined in accordance with the loss torque and an actuating signal for controlling an actuator of the internal combustion engine is generated from the target torque.