Robert Boschgmbh

Michael Westerdorf

Eberhard Schnaibel

Lothar Raff

Gunther Plapp

Cornelius Peter

Ernst Wild

Manfred Homeyer

Method and arrangement for determining the internal resistance of a

Method and arrangement for lambda control

The invention is directed to a method for lambda control of an internal combustion engine having a catalyzer and a measuring probe arrangement in front of the catalyzer for emitting a measuring signal and a testing probe arrangement behind the catalyzer for emitting a test signal. The method includes the steps of: forming a ratio between the measuring signal and the test signal at pregiven operating conditions; evaluating said ratio as an estimating quantity for the conversion rate of the catalyzer; and, modifying output values of control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, said output values being applicable for controlling an internal combustion engine having a new catalyzer. This method affords the advantage that it evaluates a catalyzer with the aid of the above-mentioned ratio value and controllably modifies values of control parameters in dependence upon the evaluation ratio. This leads to an especially stable control with low toxic gas discharge.

Method for the lambda control of an internal combustion engine having a

Process, use of the same and apparatus for lambda value detection

Control system for the air/fuel ratio of an internal combustion engine

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Moglingen, Germany

Michael Westerdorf