Engine idle speed control using predicted torque converter load

摘要

A method of controlling engine idle speed in a motor vehicle having an internal combustion engine and multi-ratio transmission when launched from a neutral idle rest condition is disclosed. During vehicle launch from neutral idle operation a feedforward or predicted torque converter load is determined and other engine torque loads are added to the feedforward or predicted torque converter load to determine the engine output torque required to control engine idle speed and provide a smooth between transmission operating modes throughout the launch period.