Stereo lambda control

US5267548A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gunter Rosenzopf · Ludwigsburg, DE
• Ulrich Steinbrenner · Kohlhof, DE
• Ernst Wild · Oberriexingen, DE
• Gerhard Schneider · Kirkland, US

Key dates

• Filing date: Feb 4, 1991
• Grant date: Dec 7, 1993
• Expiry date: Feb 4, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/0042
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In the method for the adapted precontrol and feedback control of the air/fuel mixtures to be supplied to the two fuel-metering devices of an internal combustion engine, which has two separate exhaust-gas channels with a lambda probe and a catalytic converter in each channel, a common value of the precontrol manipulated variable and a common lambda desired value are determined for both fuel-metering devices. On the other hand, values of a control manipulated variable are determined separately for each fuel-metering device and values of precontrol adaptation variables, which are dependent upon the values of the control manipulated value, are determined and are superposed separately one after the other on the common precontrol value. This method makes it possible to manage with a single device for both cylinder banks which are to be operated in a stereo lambda control.