Methods and systems for detecting a torque transmission failure in an aircraft power plant are provided. The system comprises a hydrostatic transmission for transmitting torque between a first shaft and a second shaft using hydraulic fluid, an a failure detector including a sensor configured to detect a pressure change in the hydraulic fluid. The failure detector is configured to generate an output indicative of the torque transmission failure in response to the pressure change having crossed a threshold.

A method of controlling an oil pressure system according to an aspect of the disclosure includes: a comparison step of comparing a measured load (engine torque calculation value) of an oil pressure system driven by an oil pressure pump with an allowable load of the oil pressure system (allowable engine torque value); and a control step of controlling a flow rate of the oil pressure pump based on a result of comparison between the measured load and the allowable load.

A system, apparatus and method providing a predictive maintenance system for a vehicle comprising a hydrostatic transmission. Sensors are installed on a vehicle to monitor various operating characteristics of a hydrostatic transmission. The sensors generate raw sensor data that is received by an onboard edge processing unit that applies the signals to a neural network model to derive predictions of potential future mechanical failures of the hydrostatic transmission. The inferences and raw sensor data may be sent to a remote data center via a personal communication device associated with the vehicle, to further train the neural network model.

A method is provided for operating a drive device for a working machine having a conventional maximum traction force curve, where the maximum permissible traction force of the drive device increases as the output speed of the drive device decreases. The method includes receiving an activation signal for activating a grading operation of the working machine, where the grading operation has a limited maximum traction force curve in which the maximum permissible traction force of the drive device increases less sharply than with the conventional maximum traction force curve as the output speed of the drive device decreases. A currently maximum permissible traction force is ascertained based on the limited maximum traction force curve and a current traction force is compared with the currently maximum permissible traction force. The transmission ratio of the gearbox is adjusted toward a lower output speed of the drive device based on the comparison.