Patent ID: 8041511

Claim:
Method for controlling an internal combustion engine by optimizing calibration maps (M r ) for an algorithm of estimation of a control quantity (P ctr ) of the internal combustion engine, each calibration map comprising a plurality of calibration values (P clb ) of said control quantity (P ctrs ) estimated by said algorithm, the method comprising: measuring the control quantity (P ctrm ), estimating the control quantity (P ctrs ) by means of said algorithm, and individually optimizing each calibration map (M n ) based on the measured control quantity (P ctrm ) and the estimated control quantity (P ctrs ), wherein optimizing each calibration map (M n ) comprises operating a computer to execute the steps of: optimizing at least one of said plurality of calibration values (P cbl ), and distributing said optimized calibration values (P clb - ott , ) in said calibration map (M˜ based on a preset criterion, and wherein optimizing a calibration value (P clb ) comprises: determining the estimated control quantity (P ctrs ) based on the measured control quantity (P ctrm ) and the calibration value (P clb ), computing a first standard deviation (SQM 1 ) between the measured control quantity (P ctrm ) and the estimated control quantity (P ctrs ), determining a first corrected calibration value (P clb+F ) based on the correction factor (F), determining the estimated control quantity (P ctrs ) based on the measured control quantity (P ctrm ) and the first corrected calibration value (P clb+F ), computing a second standard deviation (SQM 2 ) between the measured control quantity (P ctrm ) and the estimated control quantity (P ctrs ) based on the measured control quantity (P ctrm ) and the first corrected calibration value (P clb+F ), determining a second corrected calibration value (P clb+F ) based on the correction factor (F), determining the estimated control quantity (P ctrs ) based on the measured control quantity (P ctrm ) and the second corrected calibration value (P clb+F ), computing a third standard deviation (SQM 3 ) between the measured control quantity (P ctrm ) and the estimated control quantity (P ctrs ) based on the measured control quantity (P ctrm ) and the second corrected calibration value (P clb+F ), comparing the first (SQM 1 ), second (SQM 2 ) and third (SQM 3 ) standard deviations with each other and with a preset threshold value, and optimizing the calibration value (P clb ) based on said comparison; and utilizing the calibration value (P clb ) to control a function of the internal combustion engine.