Vehicle body management system

A vehicle body management system for managing a vehicle body having a power train formed by a plurality of parts including a prime mover, the vehicle body management system comprising:

• a processing device having a memory containing a program that calculates an efficiency value, which is a ratio of output energy to input energy of a monitoring target, the monitoring target being the power train or a part or a subsystem of the power train, on a basis of digital data of the input energy to the monitoring target and the output energy from the monitoring target calculated based on digitally converted input signal from a sensor provided to the vehicle body, and a CPU executing the program;
• and
• an output terminal that outputs the efficiency value of the monitoring target,
• wherein the processing device causes the CPU to execute the program, which configures the CPU to:
• compute a signal as a load parameter to determine a high-load condition of the power train based on the input signal from the sensor provided to the vehicle body,
• determine whether the load parameter is larger than a load determination value set in advance,
• extract the digital data of input energy and output energy of the monitoring target under the high-load condition from the digital data of the input signal from the sensor on a condition that the load parameter be larger than the load determination value,
• compute the efficiency value of the monitoring target on a basis of the digital data of input energy and output energy, and
• record the computed efficiency value of the monitoring target.