Torque converter lockup control

摘要

A control for providing a smooth, high quality torque converter lockup event in an automated mechanical transmission system (10) including a fuel-controlled engine (12) and a mechanical transmission (14) drivingly coupled by a torque converter and torque converter lockup clutch assembly (16). To achieve smooth torque converter lockup, engine torque is smoothly ramped down to a relatively low value and maintained at that value until the torque converter lockup clutch is effectively engaged.