Model-Based Calibration of ECU for Small Motorcycles

To deal with the emission regulations it is necessary to produce ECU control maps that maintain balance of emissions of HC, NO_X, CO, engine power output and fuel consumption during the motorcycle development. We have recently introduced the Model-Based Calibration (hereafter as MBC) for calibration of ECU control maps for small motorcycles, which share a big chunk of the market. When introducing we aimed at such a method that can simulate stable temperature conditions necessary for the measurement in order to make it applicable to air-cooled engines predominantly used in small motorcycles. To decrease performance difference between the prototype and the mass-production, the newly developed method allows rewriting of control parameters such as the ignition timing using the mass-production ECU. The fully automated data acquisition along with the application of MBC permits continuous test operations even in nighttime and on holidays. Moreover, the MBC flow was made such a manner that takes into account changes of part dimensions occurring from wear and affecting emissions. The MBC method has been established for development of small motorcycles to produce ECU maps having a high robustness to changes in engine operating conditions and part dimensions without using new ECU or sensor for measurement.