POWER UNIT AND CONTROLLING METHOD THEREFOR

摘要

A power unit includes two or more power modules (1, 2, 3), each comprising an engine (11), a transfer case (12) connected to the engine (11) and a hydraulic pump set (13) connected to the transfer case (12). A controlling method for the power unit is also disclosed. Compared to the prior art of using a single super high power engine, the hydraulic mobile crane using the power unit has advantages of low cost, high reliability, and not being subjected to the restrictions by road transportation conditions during transportation.