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In-Vehicle Optimization of 2-Stage Turbocharging for Gasoline Engines
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
Future downsizing for gasoline engines will lead to higher boost ratio and specific torque than realized with today's engines. In the present paper, the vehicle integration of a 2-stage-turbocharging system into a middle class vehicle is discussed, starting with the adaptation of the combustion system to high boosting ratio by means of CFD supported Charge-Motion-Design Process. Furthermore, the layout of the control concept had been supported by 1D simulation of the overall engine/vehicle system. Results from this work will be presented and compared to vehicle measurement data, leading to an assessment of optimization potential regarding driveability and discussing the sensor and actuator concept.