Altitude Compensation for Internal Combustion Engine

摘要

In order to address turbo lag at altitude, a vehicle boosts output torque of an internal combustion engine with electric motor torque generated from a battery. The residual charge of the battery is increased at altitude to provide a sufficient reserve for the corresponding increase in turbo lag. The invention is typically applied to a parallel hybrid vehicle.

主权项

1. A method of determining the residual capacity of a battery of a vehicle having an internal combustion engine and a forced induction device, said battery being adapted to supplement output torque of said engine via a rotary electrical machine during a lag period of the forced induction device, said method comprising:
determining a minimum capacity of said battery; and calculating a residual capacity above said minimum for providing supplemental torque to said engine via said electrical machine during the lag period, said residual capacity increasing with vehicle altitude.