Turbine's average input pressure determining method for spark ignition engine, involves reading expansion ratio value of turbine from data table, and multiplying ratio value with pressure to determine average input pressure of turbine

摘要

The method involves evaluating a physical parameter such as opening state of a turbine, temperature and pressure of respective intake and exhaust gas of the turbine, and mass flow rate of a turbine gas. An adapted flow rate (Qadapt) is determined using a specific relationship comprising the parameter such as mass flow rate, gas temperature and pressure. An expansion ratio value of the turbine associated to values formed by the rate (Qadapt) and the opening state, is read from a data table. The ratio value is multiplied with the pressure to determine an average input pressure of the turbine.