Patent ID: 7478533
Filing Date: 2009-01-20
Classification: F02B,F02D,Y02T

Abstract:
1. A method for controlling an internal combustion engine system with a supercharger having a compressor system provided in an intake pipe and at least partially powered by an electric motor for compressing intake air, a motor controller for controlling the electric motor, a turbine system provided in an exhaust pipe and connected to the compressor for driving the compressor system, said turbine system comprising a turbine and means for adjusting rotation of the turbine, a detector for detecting supercharging pressure downstream of said compressor system, the method comprising the steps of; determining a target supercharging pressure based on the operational conditions of the engine; calculating a first control demand value provided to the motor controller thereby driving the compressor system so that the supercharging pressure detected by the detector approaches the target supercharging pressure; determining a target value of the first control demand value based on operational conditions of the engine; and calculating a second control demand value provided to the turbine system thereby adjusting rotation of the turbine so that the first control demand value converges to the target value.