Fault detection for appliances based on energy consumption data

A non-transitory computer-readable medium comprising software code adapted, when executed on a processing device, to perform a method of detecting a fault in a device, comprising:

• receiving an energy consumption signal for the device, the energy consumption signal indicating a varying energy consumption of the device over time during operation of the device;
• selecting at least one basis function, wherein the basis function defines a signal pattern associated with a known fault type;
• evaluating a correlation between the at least one basis function and the energy consumption signal, wherein evaluating the at least one basis function comprises repeating the evaluation while varying one or more parameters of the basis function;
• determining presence of an operating fault in the device in dependence on the correlation;
• and
• generating an output based on the determination.

A computer-implemented method of detecting a fault in a device, comprising:

• receiving an energy consumption signal for the device, the energy consumption signal indicating a varying energy consumption of the device over time during operation of the device;
• selecting a basis function defining a signal pattern associated with a known fault type, wherein the basis function comprises a windowed function and is parameterized by at least one parameter, the at least one parameter comprising one or more of:
• a width parameter indicating a width of the basis function and/or signal window over which correlation is performed;
• and a shape parameter controlling a shape of the basis function;
• evaluating a correlation between the basis function and the energy consumption signal;
• determining presence of an operating fault in the device in dependence on the correlation;
• and
• generating an output based on the determination.