System and Method for Avoiding Engine Underspeed and Stall
AssigneeCaterpillar Inc.
InventorsBrian D. Hoff, Michael Barngrover, Mark E. Rettig
Life of this patent
Estimating the term…
Abstract
System and method for controlling a transmission in response to transient torque events are disclosed. The method includes commanding a maximum transmission output torque; comparing the commanded output torque to a feedback torque to determine if they are equal; and incrementally increasing the transmission output torque until equal. A machine and a powertrain include a controller configured to command a maximum negative transmission output torque in response to a transient torque event, and incrementally increase the transmission output torque until such time as the transmission output torque is equal to or within a preset range of the feedback torque.
Claims20
A method for controlling a torque-controlled transmission in response to transient torque events, comprising:
- commanding a maximum transmission output torque;
- comparing the commanded transmission output torque to a feedback torque to the transmission;
- determining if the commanded transmission output torque is equal to or within a predetermined range of the feedback torque to the transmission;
- and
- sequentially incrementally increasing the commanded transmission output torque if the commanded transmission output torque is not equal to or within the predetermined range of the feedback torque, and again determining if the commanded transmission output torque is equal to or within the predetermined range of the feedback torque until such time as the commanded transmission output torque is equal to or within the predetermined range of the feedback torque.
A powertrain having an engine connected to a transmission having an output torque and being adapted to drive ground engaging members, comprising:
- a controller configured to control operation of the transmission based on a desired output torque of the transmission in response to a transient torque event, by, at least in part, commanding maximum negative transmission output torque, comparing the maximum negative transmission output torque to a feedback torque from the ground engaging members, and incrementally increasing the transmission output torque until such time as the transmission output torque is equal to or within a preset range of the feedback torque.
A machine, comprising:
- a frame that supports an engine connected to a transmission, the transmission selectively transforming an input engine speed and engine torque to an output transmission speed and transmission torque, the transmission speed and torque being applied to a set of ground engaging members to propel the frame;
- a controller configured to control operation of the transmission based on a desired output torque of the transmission in response to a transient torque event, by, at least in part, commanding maximum negative transmission output torque, comparing the maximum negative transmission output torque to a feedback torque from the ground engaging members, and incrementally increasing the transmission output torque until such time as the transmission output torque is equal to or within a preset range of the feedback torque.
Dependencies are inferred from the claim text.