Abstract: The present disclosure relates to a hydraulic system of construction machinery and a method of controlling the hydraulic system. The hydraulic system of construction machinery and the method of controlling the hydraulic system according to the present disclosure assign a weighted value for each operation, preliminarily distribute a (available torque that can be used) value that an engine can provide, through torque weighted values for each operation, and calculate surplus torque and deficient torque by comparing a preliminary distributable torque value to required torque. The surplus torque is provided for an operation in which torque is deemed to be deficient. Thus, the hydraulic system of construction machinery and the method of controlling the hydraulic system according to the present disclosure can sufficiently use available torque that can be used so that an operator can achieve a desired level of performance during the operation.

Abstract: An abnormality diagnostic system for a work system of construction machinery includes an input portion configured to receive state information of an engine, a hydraulic pump and a work apparatus, a controller configured to calculate and mutually compare horsepower information of the engine, the hydraulic pump and the work apparatus from the received state information, and if the horsepower information are different from each other by a preset range or more, determine whether or not abnormality occurs in any one of the engine, the hydraulic pump and the work apparatus, and an output portion configured to output the determination result of abnormality. Accordingly, an abnormal situation of the construction machinery may be precisely diagnosed and notified immediately so as to make a quick response, and further, a manufacturer of the construction machinery may collect the abnormality situation data to database to reflect in a product design.

Abstract: An abnormality diagnostic system for a work system of construction machinery includes an input portion configured to receive state information of an engine, a hydraulic pump and a work apparatus of the construction machinery, a controller configured to calculate and mutually compare horsepower information of the engine, the hydraulic pump and the work apparatus from the received state information, and if the horsepower information are different from each other by a preset range or more, determine whether or not abnormality occurs in any one of the engine, the hydraulic pump and the work apparatus corresponding thereto, and an output portion configured to output the determination result of abnormality. Accordingly, an abnormal situation of the construction machinery may be precisely diagnosed and notified immediately to be able to make a quick response, and further, a manufacturer of the construction machinery may collect the abnormality situation data to database to reflect in a product design.