Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery

Abstract

The invention relates to a load-sensitive hydraulic system with controllable oil pump limit displacement, a control method and engineering machinery. The load-sensitive hydraulic system with the controllable oil pump limit displacement comprises a load-sensitive variable pump and a control mechanism; the load-sensitive variable pump comprises a variable mechanism and an oil pump, and the variablemechanism is connected with the oil pump; the control mechanism is operably connected with the variable mechanism, and the control mechanism is configured to operably control the variable mechanism according to working conditions so as to adjust the limit displacement of the oil pump through the variable mechanism. According to the invention, in a load-sensitive system, the limit displacement of the oil pump can be randomly adjusted in an adjustable range according to the requirements of working conditions.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a load-sensitive hydraulic system with controllable limit displacement of an oil pump, a control method and construction machinery. Background technique [0002] The hydraulic system of the crane is responsible for the transmission of power and the speed control and adjustment of the hoisting, luffing, telescopic and other actions of the crane. At present, the load-sensing technology is generally used on small and medium-sized tonnage cranes, which has the advantages of stable and reliable system and good control performance. With the rapid development of wheeled crane hydraulic system technology, especially in the context of increasing fuel costs, the method of optimizing the matching of wheeled crane hydraulic system and engine power to achieve energy saving has attracted more and more attention. Upgrading the load sensitive system, on the basis of maintaining the good per...

AI Technical Summary

Problems solved by technology

[0003] The limit displacement control method of the related oil pump is to control the load sensitive system through constant power or variable power. Among them, the constant power control method cannot match and adjust the hydraulic system according to the working conditions of the engine; and the variable power control method has control problems. Flexible, and it is impossible to precisely match the limit displacement of the oil pump with the engine speed

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