Patent ID: 7530229

Claim:
A control apparatus for an electrically assisted supercharger, comprising: a supercharger disposed on an intake passage of an internal combustion engine mounted on a vehicle, driven by an electric motor; controlling means for controlling the electric motor to control a boost pressure; pressure detecting means for detecting a state of the atmospheric pressure, an intake air mass detecting means for detecting the intake air mass; a turbocharger for performing supercharging by making use of an exhaust flow of the internal combustion engine; and a variable nozzle mechanism for variably controlling a supercharging state by the turbocharger; wherein: when the atmospheric pressure detected by the pressure detecting means becomes less than a predetermined value, the controlling means makes a driving force of the electric motor larger than that when the atmospheric pressure is not less than the predetermined value, when the atmospheric pressure detected by the pressure detecting means becomes more than the predetermined value, the variable nozzle mechanism controls the variable nozzle opening with a feedback control based on a deviation in an intake air mass detected by the intake air mass detecting means and a target intake air mass determined based on an operating state of the internal combustion engine, and when the atmospheric pressure detected by the pressure detecting means becomes less than the predetermined value, the variable nozzle mechanism prohibits the variable nozzle opening with the feedback control, based on the deviation between the intake air mass and the targeted intake air mass, and controls the variable nozzle opening with the targeted variable nozzle opening calculated based on the rotation number and load of the internal combustion engine.