Caterpillar Inc.

Mathew D Guldan

Timothy A Lorentz

Hoon Ki Lee

Bradley John Will

Matthew Michael Tinker

Chintan Govindbhai Kothari

Kyle David Duryea

Michael A Gilles

Timothy Alan Lorentz

A control system for a work machine includes an engine, a torque converter, and a lock-up clutch assembly. The lock-up clutch assembly includes a lock-up clutch that can be positioned in an engaged state, for bypassing the torque converter, or a disengaged state. The control system includes a controller configured to determine that the engine is in a cranking state, and cause, based on determining that the engine is in the cranking state, the lock-up clutch to be positioned in the engaged state. The controller is also configured to determine that the lock-up clutch is in the engaged state. The controller is further configured to determine, based on an engine speed, that the engine has started, and cause, based on determining that the engine has started, the lock-up clutch to be positioned in the disengaged state.

Control system for work machine

A transmission system is disclosed for use with a machine. The transmission system may have a first clutch configured to transfer power in a first direction, a second clutch configured to transfer power in a second direction, a brake, and an interface device configured to generate a first signal indicative of a desire to shift power transfer directions. The transmission system may also have a controller configured to cause disengagement of the first clutch in response to the first signal, to cause the brake to apply a retarding torque to a traction device, and to determine an amount of the retarding torque being applied to the traction device. The controller may also be configured to selectively transfer the retarding torque to the second clutch when a capacity of the second clutch to provide retarding torque is about equal to the amount of the retarding torque being applied by the brake.

Transmission system implementing automated directional shift braking

A transmission system is disclosed for use with a machine. The transmission system may have a first clutch to transfer power in a first direction, a second clutch to transfer power in a second direction, a brake, a sensor to generate a first signal indicative of speed, and an input device to generate a second signal indicative of a desire to shift directions. The transmission system may also have a controller to cause disengagement of the first directional clutch in response to the second signal, and to cause the brake to apply retarding torque. The controller may also be configured to determine an error value based on the second signal and a target transmission system speed, to selectively increase retarding torque when the error value increases, and to selectively transfer retarding torque to the second directional clutch when a value of the second signal is less than a threshold value.

A control system for a transmission engages at least three clutches to create braking within the transmission to slow a machine during a shuttle shifting operation. The control system may apply the clutches so as to allocate wear between the clutches equally or unequally, as desired.

System for allocating transmission clutch wear

A control system for a transmission engages three clutches to create braking within the transmission to slow a machine during a shuttle shifting operation. The control system may apply the clutches so as to allocate wear between the clutches equally or unequally, as desired.

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East Peoria, IL, United States of America

Mathew D Guldan