Data processing unit for construction machine

A data processing unit for a construction machine, which collects and processes data on the load condition of an engine of the construction machine, the unit comprising:

• (a) detecting means for detecting a rotational speed of the engine when no load is imposed on the engine;
• (b) detecting means for detecting an actual rotational speed of the engine;
• (c) load map setting means for setting a load map based on the rotational speed when no load is imposed and the actual rotational speed which have been detected by the detecting means, by dividing combinations of first parameter values and second parameter values into a plurality of regions, the first parameter values being the values of the rotational speed when no load is imposed while the second parameter values being the values of the difference between the rotational speed when no load is imposed and the actual rotational speed;
• and
• (d) calculating and storing means for accumulating the time of detecting the first parameter value and second parameter value of each region in the load map set by the load map setting means until a certain time elapses and for storing the result of the accumulation for each region in the load map.