Method and device for calibrating and updating a power model

A device for updating a power model for a multi-state device, the device comprising:

• a power meter configured to measure power consumed by the multi-state device for a first period of time and generate a digital representation of a power trace based on the measured power consumption;
• a processor;
• and
• a non-transitory computer readable medium operably connected to the processor, the computer readable medium containing a set of instructions configured to instruct the processor to:
• receive a device state log comprising a time-based representation of states of the multi-state device for the first period of time and the digital representation of the power trace generated by the power meter,
• erode the device state log by setting to zero a value of the representation for a duration of time of state transition at each state transition within the device state log, thereby producing an eroded device state log,
• smooth the power trace by applying a finite impulse response filter to the power trace,
• determine energy consumption based on an area under the smoothed power trace for the first period of time in the eroded device state log,
• create an updated power model for the multi-state device based upon the energy consumption for the first period of time in the eroded device state log,
• store the updated power model in a non-transitory computer readable medium operably connected to the multi-state device, and
• use the updated power model to estimate energy consumption of the multi-state device.

A method of updating a power model for a multifunction printing device, the method comprising:

• receiving, at a processing device, a device state log comprising a time-based representation of states of the multifunction printing device for a first period of time, wherein each of the states represents a specific function that the multifunction print device is configured to perform;
• measuring, by a power meter, power consumed by the multifunction printing device for the first period of time and generating a digital representation of a power trace based on the measured power consumption;
• receiving by the processing device, the digital representation of the power trace;
• eroding, by the processing device, the device state log, wherein the eroding comprises setting to zero a value of the representation for a duration of time of state transition at each state transition within the device state log, thereby producing an eroded device state log;
• smoothing, by the processing device, the power trace by applying a finite impulse response filter to the power trace;
• determining, by the processing device, energy consumption based on an area under the smoothed power trace for the first period of time in the eroded device state log;
• creating, by the processing device, an updated power model for the multifunction print device based upon the energy consumption for the first period of time in the eroded device state log;
• storing, by the processing device, the updated power model in a non-transitory computer readable medium operably connected to the multifunction printing device;
• and
• using the updated power model to estimate energy consumption of the multifunction printing device.