Development and Experimental Validation of Empirical and Semi-Physical Exhaust Gas Temperature Models
Exhaust gas temperature is one of the main parameters under the focus of engine manufacturers, due to its effects on both Turbo-Charger durability and catalyst efficiency. Typically, the measurement of such variable at the test bench is carried out by using thermocouples that are not available for on-board application. For this reason, an accurate and reliable model for Real-Time calculation of this variable is particularly important, to develop more precise and efficient strategies to prevent damages to the exhaust system and optimize catalyst efficiency. In this work, two different models for the calculation of the exhaust gas temperature are described and validated, comparing the model outputs with experimental measurements. At first a control-oriented empirical model is presented, describing how the polynomial approach used in a previous work of the authors has been applied to reproduce the steady-state thermocouple measurement.