With Commins engine and XCMG customized characteristic curve, XE490DK can realize fuel economy and strong power. With the efficient HPI fuel injection technology used, this engine can realize independent auxiliary cylinder control and full-electronic control, greatly improving the fuel economy. This engine is designed and manufactured elaborately for construction machinery working conditions. The XCMG “self-optimization load identification technology” can adjust the main pump absorbing power in real time to ensure that the engine operates in the fuel consumption economic zone, the large-displacement main valve is matched, the response speed is high, and good fuel economy can be provided while the high operation efficiency is guaranteed.