Investigation on the Validity Region of Online Combustion and Torque Models of Gasoline Engines with Retarded Ignition

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 190)


The recently proposed online mean-value thermodynamic combustion model suffers from its error-prone CA50 prediction. In an effort to improve the accuracy of CA50 prediction in the case of ignition retard, this chapter demonstrates the convergence of normalized IMEPH-CA50 predictions towards a unanimous characteristic curve indiscriminately for various gasoline engine selections, speeds and loads. For the first time, this chapter reveals the physical principle of a characteristic curve via an ideal-heat-release model and thereby formulates a validity region of the IMEPH-CA50 predictions. The predicted values outside of the region will then be corrected by a surrogate of the characteristic curve. In this way, ECUs successfully identify invalid CA50 predictions online and modulate them towards the actual values. Large-scale experiments have shown the developed method improves the accuracy in CA50 prediction, while preserving the high accuracy of IMEPH prediction.


Torque model Gasoline engine Prediction accuracy Validity region Ignition retard 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Geely Automobile Research InstituteHangzhouChina

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