Development of a heavy-duty diesel engine with two-stage turbocharging

Abstract

A mean value model was developed by using Matrixx/ Systembuild simulation tool for designing real-time control algorithms for the two-stage engine. All desired characteristics are achieved, apart from lower A/F ratio at lower engine speeds and Turbocharger matches calculations. The CANbus is used to communicate between Bosch unit and AC104, which are used for fuel metering and the algorithm and controlling HP bypass valves on the experimental engine respectively. A simplified model of the fuel quantity was developed to determine the transient behaviour of the engine. The experiment was performed with a DAF 355kW engine for validating the results of computer simulations. The results show that the estimated PM emissions meet EURO III standards with relatively small BSFC penalty. The simulation and the analysis of results indicate that the combustion system, pressure losses, matching of turbocharger and calibration procedure can be improved further. It is proved that output of 450kW can be obtained at maximum speed from a 12-litre engine by using a two-stage turbocharging system.