Abstract: The present invention relates to an electronically driven pressure boosting system that is used to boost the torque output of an Internal combustion engine. Engine operating parameters are fed to an engine control unit (ECU) controlling a supercharger that boosts engine torque. The ECU monitors at least one of the engine operating parameters and calculates the likelihood that the engine torque needs to be boosted by the supercharger. When the supercharger is operating at an idle speed, the ECU controls the idle speed so that a lag time varies inversely with the calculated likelihood that the supercharger needs to boost engine torque.

Abstract: The present invention relates to an electronically driven pressure boosting system that is used to boost the torque output of an internal combustion engine. Engine operating parameters are fed to an engine control unit (ECU). A supercharger is controlled by the ECU and when powered by an electrical supply system boosts engine torque. When the supercharger is in an idle mode of operation at low supercharger speeds it does not boost torque, and when it is in a boost mode of operation at high supercharger speeds, it does boost engine toque. The supercharger requires a lag time to accelerate from an idle speed to a boost speed. The electronic control system monitors the engine operating parameter(s) and calculates therefrom a likelihood that the engine torque will need to be boosted by the compressor.