NEW STO MODE Downloaded from SAE International by Nan Kai University of Technology, Monday, December 02, 2019 Practical experience shows that for STO systems where a crossing maneuver is possible with different turbochargers’ speeds exist an important probability to introduce tremendous strain on the turbochargers’ shaft and bearings. Therefore, basic idea of the operation mode is to achieve (even at partial loads) the same turbochargers’ speed when the crossing maneuver is starting. The control system requires the next information: • Inline compressor speed (n1), • Waiting compressor speed (n2), • Engine speed (n), • Inline compressor pressure (p).