Abstract
KEYWORDS – Heat engine, Spark ignition engine, Turbo charging system, Controller design, Reduced order model
ABSTRACT – Torque profile control is one of required technologies for propulsion engines. A smaller parametric model is more preferable for control algorithm design and evaluation. Mean value engine torque can be obtained from throttle opening change using a transfer function. A transfer function for a turbocharged engine was investigated with thermo-dynamic equations for a turbine and a compressor. A small turbocharged engine was tested to verify the model and to obtain parameters for the model with test data. Turbine speed was measured with temperatures, pressures and air mass flow. Turbine speed response is modeled as a first order system to air mass flow into a combustion chamber. The pressure ratio at the compressor is approximated by a curve proportional to the turbine speed square.