公开(公告)号：US20190193558A1

公开(公告)日：2019-06-27

申请号：US15851820

申请日：2017-12-22

Applicant: Caterpillar Inc.

Inventor： Paul Anthony Dvorak ,  Corwin Eugene Storer ,  Richard D. Johnston

IPC: B60K17/10 ,  B60K17/356 ,  F16H47/04

CPC classification number: B60K17/10 ,  B60K17/356 ,  B60Y2200/20 ,  B60Y2400/3032 ,  F16H47/04 ,  F16H2047/045

Abstract: A system for providing torque assist in a vehicle includes a hydrostatic transmission that is associated with otherwise unpowered wheels of the vehicle. Operation of the hydrostatic transmission can be commanded by a controller based on sensor inputs, indicative of wheel speeds of each wheel present in the vehicle, to provide torque to the otherwise unpowered wheels of the vehicle. Moreover, when torque difference exists between one wheel and another from the otherwise unpowered wheels, the controller can independently and selectively actuate one or more pumps that are included in the hydrostatic transmission so that each wheel from the set of otherwise unpowered wheels rotates at the same wheel speed.