Abstract: A process for decomposing safety software involves the steps of providing a first software module associated with a first logical unit, providing a second software module associated with a second logical unit, instructing the first software module to implement a first safety goal based on a quality management level, and instructing the second software module to implement a second safety goal based on a safety integrity level, where the second software module uses at least one input and at least one output of the second logical unit to determine if the second safety goal is satisfied. Consequently, the second software module uses a result of the first software module to determine if the first safety goal has been completed, and the second software module uses at least one algorithm to verify an operational status of the first logical unit.

Abstract: A hydrostatic driveline has a power source, a transmission portion, a hydrostatic pump, a hydrostatic motor, a transfer case, a first axle assembly, an inter-axle drive shaft, and a second axle assembly. The transmission portion is drivingly engaged with the power source. The hydrostatic pump is in driving engagement with the transmission portion. The hydrostatic motor is in fluid communication with the hydrostatic pump. The transfer case is in driving engagement with the hydrostatic motor. The inter-axle drive shaft is in driving engagement with the transfer case and the transmission portion. The transmission portion, the hydrostatic pump, the hydrostatic motor, the transfer case, and the inter-axle shaft form a first power path for the hydrostatic driveline and the transmission portion and the inter-axle shaft form a second power path for the hydrostatic driveline.

Abstract: A method and an apparatus for controlling a wet clutch are provided. The clutch comprises a pump, a piston, and a fluid conduit. The pump provides a housing with a hydraulic fluid. The piston is movably disposed in the housing and is movable into an extended position by a preloaded spring and into a retracted position by applying an engagement pressure on the piston by the hydraulic fluid. In the retracted position torque is transmittable through the clutch. The fluid conduit connects the pump and the housing. The method comprises the steps of prefilling the clutch by applying a prefill pressure on the piston, prefilling the fluid conduit line and the housing with the hydraulic fluid. The prefill pressure is lower than the engagement pressure required to move the piston into the retracted position.

Abstract: A process for decomposing safety software involves the steps of providing a first software module associated with a first logical unit, providing a second software module associated with a second logical unit, instructing the first software module to implement a first safety goal based on a quality management level, and instructing the second software module to implement a second safety goal based on a safety integrity level, where the second software module uses at least one input and at least one output of the second logical unit to determine if the second safety goal is satisfied. Consequently, the second software module uses a result of the first software module to determine if the first safety goal has been completed, and the second software module uses at least one algorithm to verify an operational status of the first logical unit.

Abstract: A method of operating a driveline including a powersplit transmission is provided. The driveline may be operated in a hydrostatic power transmission mode and a blended hydrostatic/mechanical power transmission mode. The method comprises the steps of providing a hydrostatic circuit, detecting a rapid deceleration of the vehicle, and adjusting a threshold of at least one pressure relief valve forming a portion of the hydrostatic circuit in response to the sudden deceleration. The at least one pressure relief valve facilitates quickly changing the driveline from the blended hydrostatic/mechanical power transmission mode to the hydrostatic power transmission mode.