METHODS AND SYSTEMS FOR BOOST CONTROL

摘要

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.

主权项

1. A method for a hybrid vehicle having a turbocharged engine, comprising:
during a transmission gear shift, adjusting an amount of motor assist provided to a turbocharger compressor from an electric motor based on vehicle altitude, and further based on the transmission gear shift;
wherein the adjusting includes increasing the amount of motor assist as the vehicle altitude increases above a threshold, the method further comprising adjusting the amount of motor assist responsive to a clutch depression, andwherein the adjusting further includes providing increased motor assist during a transmission upshift relative to a transmission downshift as the vehicle altitude increases above the threshold, wherein the vehicle altitude is determined based on one or more of a navigational system and a barometric pressure.