Variable blade float

A work vehicle comprising:

• a frame;
• an operator cab connected to the frame;
• a work implement movable relative to the frame;
• and
• a hydraulic control circuit operable to control movement of the work implement, the hydraulic control circuit including:
• a pump;
• a reservoir;
• a hydraulic actuator including a first side and a second side, the hydraulic actuator being configured to move the work implement relative to the frame;
• a control valve configured to control supply of hydraulic fluid from the pump to the actuator, and return of hydraulic fluid from the actuator to the reservoir;
• a first proportional pressure reducing and/or relief valve (PPRV) fluidly positioned between the reservoir and the first side of the hydraulic actuator, the first PPRV configured to permit flow of fluid from the first side of actuator to the reservoir in response to a pressure at the first side of the hydraulic actuator being greater than a first predetermined pressure value;
• a second PPRV fluidly positioned between the reservoir and the second side of the hydraulic actuator;
• a first pressure sensor configured to sense a pressure at the first side of the hydraulic actuator, the first pressure sensor configured to generate a first pressure signal;
• and
• a second pressure sensor configured to sense a pressure at the second side of the hydraulic actuator, the second pressure sensor configured to generate a second pressure signal;
• and
• a controller in electrical communication with the control valve, the first and second PPRV's, and the first and second pressure sensors, the controller being configured to receive a set value for the first predetermined pressure value, and to receive the first pressure signal from the first pressure sensor, the controller being configured to send a command signal to the first PPRV to adjust the first predetermined pressure value based at least in part on the set value for the first predetermined pressure value and based at least in part on the first pressure signal.