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

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 lambda control including a lambda control loop utilizing a plurality of control parameters, the method comprising the steps of:

• forming a ratio between a value based on the measuring signal and another value based on the test signal when one or more pregiven engine operating conditions are met, said ratio having an instantaneous value;
• evaluating said ratio as an estimating quantity for a conversion rate of the catalyzer;
• modifying said control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, the control parameters being applicable for controlling an internal combustion engine having a new catalyzer;
• and
• not forming said ratio when said measuring signal exceeds a threshold.

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 lambda control including a lambda control loop utilizing a plurality of control parameters addressable via operating conditions of the engine and a plurality of modifier values addressable via a conversion rate of the catalyzer, the method comprising the steps of:

• forming a ratio between the measuring signal and the test signal when one or more pregiven engine operating conditions are met, said ratio having an instantaneous value;
• evaluating said ratio as an estimating quantity for the conversion rate of the catalyzer;
• modifying said control parameters in a pregiven controlled manner by said modifier values corresponding to the instantaneous value of said ratio thereby forming a plurality of modified control parameters;
• and,
• controlling the engine on the basis of said modified control parameters.

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 lambda control including a lambda control loop utilizing a plurality of control parameters, the method comprising the steps of:

• forming a ratio between a value of the measuring signal and another value based on the test signal when one or more pregiven operating conditions are met, said ratio having an instantaneous value;
• evaluating said ratio as an estimating quantity for a conversion rate of the catalyzer;
• modifying said control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, the control parameters being applicable for controlling an internal combustion engine having a new catalyzer;
• and,
• emitting an error signal when the instantaneous value of the estimate ratio exceeds an error threshold.

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 lambda control including a lambda control loop utilizing a plurality of control parameters, the method comprising the steps of:

• forming a ratio between a value of the measuring signal and another value based on the test signal at pregiven operating conditions;
• evaluating said ratio as an estimating quantity for a conversion rate of the catalyzer;
• modifying said control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, the control parameters being applicable for controlling an internal combustion engine having a new catalyzer;
• and,
• using mean amount deviations of signal amount mean values of respective probes as a measuring signal and as a test signal, respectively, with said probes being present within respective probe arrangements.

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 lambda control including a lambda control loop utilizing a plurality of control parameters, the method comprising the steps of:

• forming a ratio between a value of the measuring signal and another value based on the test signal at pregiven operating conditions;
• evaluating said ratio as an estimating quantity for a conversion rate of the catalyzer;
• modifying said control parameters in a pregiven controlled manner on the basis of the instantaneous values of said ratio, the control parameters being applicable for controlling an internal combustion engine having a new catalyzer;
• and
• only changing said control parameters when the particular value of the estimate ratio differs from the previously detected value by more than a pregiven difference.