For the power recovery of diesel engine, the matching
calculation of wastegate turbocharging system was carried out with the
purpose of boost pressure recovery and the compressor and turbine
characteristic were determined. The performance calculation was carried out
within the operating range of diesel engine at different altitudes and the
boost pressure MAP diagrams were achieved. The control strategies of wastegate valve were determined according to the switching boundary
linesbased on the target boost pressure. The research result show that the
matching scheme can recover the boost pressure at 3
000 m and 0 m, but may overspeed at high altitude and
high speed conditions. With the decrease of altitude, the full torque value of
diesel engine for every speed decreases. In addition, the operating zone of
wastegate valve closing state reduces and that of
wastegate adjusting state increases with the increase
of altitude.
