CONTROL METHOD AND CONTROL APPARATUS FOR TELESCOPING OF BOOM AND ENGINEERING MACHINERY

摘要

Disclosed is a control method for the telescoping of a boom. The method comprises: when the boom is performing a telescoping action, determining, on the basis of an acquired current ambient temperature and a prestored first corresponding relation, a nominal current required by the telescoping action when operating steadily, then inputting the nominal current to a telescoping proportional valve, where the first corresponding relation is the first corresponding relation between the ambient temperature and the nominal current required by the telescoping action of the boom when operating steadily; when the boom is in the process of performing the telescoping action, determining the actual telescoping speed of a telescoping oil cylinder, and adjusting the current input to the telescoping proportional valve on the basis of a difference acquired by subtracting the actual telescoping speed from a preset telescoping speed of the oil cylinder. The method allows for improved positioning accuracy of telescoping at low-speed segments, thus improving the completion rate of automatic telescoping of the boom of a crane. Also disclosed are a control apparatus for the telescoping of the boom and engineering machinery having the control apparatus.