CONCLUSION
Parametris the turbocharger power model with this methodology results in excellent models. Validation results for the complete air path model in the time domain can be found in Mrosek et al. (2010) and Mrosek and Isermann (2009). It is analytically shown that quasi stationary excitation signals are limited to dynamical fast processes,since the measurement error rises quadratically with the proportion of the process time constant. Mainly depending on dynamical slow temperatures, the turbocharger power models should be parametrised by stationary measurements. Here a cold and hot engine measurement in conjunction with the optimisation methodology allow to separate the heat transfer and aerodynamic power. It is shown that especially at low turbocharger power the heat transfer has a large impact on the measured enthalpy difference. Extending the turbine power model of Zahn (2010) by the model input ′
3 and the heat transfer ˙Qt,3/4 significantly improves the model quality.