Working machine and working machine monitoring system

A work machine monitoring system comprising a monitoring server connected to a plurality of work machines through a network,

• wherein each of the work machines comprises an engine and a position detection module, and the monitoring server is programmed to:
• receive, from each of the plurality of work machines, individual information of the respective work machine comprising an engine operation parameter representing an operation state of the engine mounted on the respective working machine, a refueling timing at which fuel is supplied to the respective working machine and position information of the respective work machine output from the position detection module;
• determine that a cause of a change in the engine operation parameter of one of the work machines is due to a change in a fuel property, if a change amount of the engine operation parameter of the one of the work machines exceeds a first threshold value which is a reference value corresponding to a predetermined fuel type within a first time period in which an influence by the fuel property is considered to arise;
• when it is determined that the fuel of the one of the work machines is abnormal, extract the individual information including the position information of the plurality of work machines at a same loading site as the one of the work machines within a predetermined time range;
• when the extracted individual information shows that there is an abnormality in the fuel among of the plurality of work machines at the same loading site as the one of the work machines within the predetermined time range, determine that the cause of the change in the engine operating parameter of the one of the work machines is based on the abnormality in the fuel;
• when the extracted individual information shows that there is no abnormality in the fuel among of the plurality of work machines at the same loading site as the one of the work machines within the predetermined time range, determine that the cause of the change in the engine parameter of the one of the work machines is not based on the abnormality in the fuel of the one of the work machines but is inherent to the of the one of the work machines;
• and
• when the abnormality in the fuel of the one of the work machines is determined, transmit an instruction information for instructing a restriction in output power of the engine for the one of the work machines.