Patent ID: 8166795

Claim:
A method for resetting a calibration of a sensor operating out of a prescribed range in a hydraulic actuation system, the hydraulic actuation system including: a pump arranged to supply fluid flow in response to a fluid flow demand; a reservoir arranged to hold fluid; a plurality of work-ports, such that the pump is in fluid communication with the reservoir and the plurality of work-ports; a plurality of sensors, each sensor arranged to sense pressure at a corresponding one of the plurality of work-ports; a valve system arranged to control fluid flow between the pump, the reservoir and the plurality of work-ports; and a controller arranged to regulate the pump and the valve system in response to the fluid flow demand and to the sensed pressures; the method comprising: detecting the sensor operating out of the prescribed range; relieving pressure in the hydraulic actuation system; opening all work-ports to the reservoir; sensing pressure at each sensor; resetting all the sensors to a reservoir pressure; supplying all the sensors with the fluid at a maximum pump pressure; sensing the maximum pump pressure at each of the plurality of sensors; determining an average pressure value across all sensors of the plurality of sensors whose sensed pressure is within the prescribed range of the maximum pump pressure; assigning the determined average pressure value to the sensor that is operating out of the prescribed range; and resetting the calibration of the sensor that is operating out of the prescribed range based on the reservoir pressure and the average pressure values.