Method for operating a vehicle driveline

A method of operating a driveline for a vehicle which may be operated in a hydrostatic power transmission mode or a blended hydrostatic/mechanical power transmission mode, the method comprising the steps of:

• providing a hydrostatic circuit comprising pressure transducers, the hydrostatic circuit used in the hydrostatic power transmission mode and the blended hydrostatic/mechanical power transmission mode;
• providing a controller in communication with the pressure transducers and at least one relief valve;
• sensing a fluid pressure within a first drive fluid conduit and a second drive fluid conduit of the hydrostatic circuit with the pressure transducers;
• receiving a signal from the pressure transducers by the controller indicating the fluid pressure within the first drive fluid conduit and second drive fluid conduit;
• detecting a rapid deceleration of the vehicle, wherein an increase in fluid pressure within the first drive fluid conduit or the second drive fluid conduit indicates the rapid deceleration of the vehicle;
• adjusting a threshold of the at least one relief valve with the controller in response to the detection of the rapid deceleration;
• and
• transitioning the driveline from the blended hydrostatic/mechanical power transmission mode to the hydrostatic power transmission mode, wherein the adjustment of the at least one relief valve facilitates changing the driveline from the blended hydrostatic/mechanical power transmission mode to the hydrostatic power transmission mode.