Machine powertrain control system and method

摘要

A machine having a powertrain including an engine operably connected to a torque converter and a transmission. The machine includes a control system receive an activation signal indicative of an automatic mode operation of the machine and command the torque converter to remain in a direct-drive mode while the transmission shifts from a first gear ratio to a second gear ratio. The control system also limits engine speed below a first engine speed limit when a gear ratio setting of the transmission is indicative of the second gear ratio.

主权项

1. A machine having a powertrain, the powertrain including an engine operably connected to a torque converter, the torque converter connected to a transmission, the machine comprising:
a selector interface configured to activate a manual mode operation or an automatic mode operation of the machine; and a control system configured to:
receive an activation signal from the selector interface indicative of the automatic mode operation of the machine; and when in the activation signal is received to:
command the transmission to shift from a second gear ratio to a first gear ratio when the torque converter is in a converter drive mode;command the torque converter to switch the converter drive mode to a direct drive mode;command the torque converter to remain in the direct-drive mode while the transmission shifts from the first gear ratio to the second gear ratio; andsend a speed command signal to the engine to limit an engine speed below a first engine speed limit when a gear ratio setting of the transmission is indicative of the second gear ratio.