Integrated control system of piston variable pump

Abstract

The invention discloses an integrated control system of a piston variable pump, which is combined with the piston variable pump. The piston variable pump comprises an oblique plate, wherein the oblique plate is installed in the piston variable pump, and the displacement of the piston variable pump is determined according to the oblique angle of the oblique plate. The integrated control system of the piston variable pump comprises a big connecting rod, a small connecting rod, a lower variable cylinder, an upper variable cylinder, an integrated control assembly and a control oil way, wherein thebig connecting rod and the small connecting rod are respectively connected to both ends of the oblique plate, the big connecting rod is used as a piston of the lower variable cylinder and is connected with the lower variable cylinder, and the small connecting rod is used as a piston of the upper variable cylinder and is connected with the upper variable cylinder; high-pressure oil of an oil outlet or control oil of an external control port of the piston pump are usually introduced to the upper variable cylinder; the integrated control assembly is connected with the oil outlet of the piston pump by virtue of an oil way, and the integrated control assembly is connected with the small connecting rod; and the lower variable cylinder is connected with the integrated control assembly by virtueof the control oil way.

Description

technical field [0001] The invention relates to the technical field of hydraulic pump control systems, and more precisely relates to an integrated control system for a plunger variable displacement pump. Background technique [0002] In the hydraulic control system of construction machinery, the integrated control of electric proportional positive displacement control and pressure cut-off control is a commonly used variable mode for piston variable pumps. Among them, the electric proportional positive displacement control refers to the control method that automatically adjusts the displacement increase of the plunger variable pump by increasing the input control current. The use of electric proportional positive displacement control is conducive to the realization of the control programming of the host system, and through the signal collection and analysis of pressure sensors and flow sensors, the output current to the plunger variable pump is controlled by the program to qu...

AI Technical Summary

Problems solved by technology

In view of this problem, it is solved by setting a larger minimum displacement. Although it can ensure that the plunger variable pump has an output flow when the proportional solenoid suddenly fails, the main engine system pressure will be higher than the pressure during the pressure cut-off control process. The maximum pressure set by the cut-off control will continue to rise, and the safety protection function of the pressure cut-off control will basically fail

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