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.

Abstract: A method for indirectly detecting a movement of a machine and a failure of a speed sensor is disclosed. The method may include receiving an operator input signal, and determining a first factor based on the operator input signal. The method may also include measuring a machine operation parameter, and determining a second factor based on the machine operation parameter. The method may further include identifying a movement of the machine if the first factor is out of a first threshold range and the second factor is out of a second threshold range for at least a first threshold length of time. The method may also include determining a speed sensor failure if the movement of the machine is identified and no speed is detected by the speed sensor for at least a second threshold length of time.

Abstract: A method for indirectly detecting a movement of a machine and a failure of a speed sensor is disclosed. The method may include receiving an operator input signal, and determining a first factor based on the operator input signal. The method may also include measuring a machine operation parameter, and determining a second factor based on the machine operation parameter. The method may further include identifying a movement of the machine if the first factor is out of a first threshold range and the second factor is out of a second threshold range for at least a first threshold length of time. The method may also include determining a speed sensor failure if the movement the machine is identified and no speed is detected by the speed sensor for at least a second threshold length of time.