The VCM, EMS, ECU, TCU, EHC, PEV battery, motor and electronic control management systems can understand changes to core layer data of the car, and then conduct big data analysis of and reporting on user driving habits, accident details, parts to be repaired, car maintenance information, and condition of key components such as the engine and transmission to help used-car companies build a reliable evaluation system and help users with good driving habits enhance the residual value of used cars.