US Patent 9540989 Methods and systems for boost control

Methods and systems are provided for adjusting operation of an electric motor coupled to a compressor at high altitude engine operation. In one example, the method may include adjusting a ratio of electric compressor assist provided by an electric motor to an intake compressor relative to turbine assist provided via a wastegate during engine idling conditions as well as during transmission gearshifts. The method allows for engine idle speed and torque to be maintained at high altitudes while reducing sluggish boost behavior.