CLUTCHED SUPER TURBO CONTROL STRATEGY

摘要

A method of controlling an internal combustion engine boosting system of the type including an exhaust-driven turbocharger (33) and a mechanically- driven supercharger (15). The supercharger (15) includes rotors (21) and a clutch (27) operable in a first condition (FIG. 1) to transmit torque from a mechanical drive source (E) to a supercharger input (25) in response to a positive input (75), and operable in a second condition (FlG. 2) to interrupt the transmission of torque from the source (E) to the input (25). The method is characterized by determining possible operation of the clutch (27) in a first condition (FIG. 1); and commanding a bypass valve (53) toward a closed position (FIG. 1), forcing air through the supercharger (15). The airflow causes the supercharger rotors (21) to rotate, thus rotating the input (25) of the supercharger prior to the clutch (27) operating in the first condition (FIG. 1).