| 摘要 |
<p>The method and controller regulate a machine (100) having a powertrain (120) including an engine (110) connected to a transmission (130) having a plurality of gear ratios (132) for changing the speed ratio. Disposed between the engine (110) and the transmission (130) is a torque convertor (160) associated with a lockup clutch (170). A shift signal can be received that indicates a gear shift between gear ratios (132). In response, the fluid pressure in the lockup clutch (170) can be reduced to an unlocked pressure (244) at which the lockup clutch (170) is unlocked but does not slip. The speed ratio (202) in the transmission (130) is thereafter monitored for an inertia phase (214) and a torque phase (212). In the inertia phase (214), the speed ratio (202) of the transmission (170) begins to change and in the torque phase (212), the speed ratio (202) remains constant. During the inertia phase (214), the fluid pressure in the lockup clutch (170) is reduced to a hold pressure (246) in which the lockup clutch slips.</p> |
