Hydraulic cylinder control system and control method for direct drive servo pump control electro-hydraulic hybrid drive

Abstract

The invention provides a direct drive type servo pump control electro-hydraulic combined driving hydraulic cylinder control system and a control method. The control system comprises a servo motor driver module, a pump controlled cylinder module and an auxiliary oil circuit module, wherein a servo driver controls a servo motor to drive a two-way pump for generating hydraulic energy, two oil circuits of the two-way pump are connected with a rod port and a head port of the hydraulic cylinder respectively, an oil tank is used for oil topping up and oil drainage when the flow quantity of the rod port and the head port is unbalanced, and the direction of motion of a piston rod of the hydraulic cylinder is controlled by the positive and negative rotation direction of the servo motor. The direct drive type servo pump control electro-hydraulic combined driving hydraulic cylinder control system provided by the invention has the advantages that the problem of asymmetric flow quantity existing in a pump control hydraulic control is solved effectively, the circulating oil consumption of the system and the pressure loss caused by oil flowing are reduced, the overall system is compact and easy to realize integration, and the pressure loss and heating of a conventional electro hydraulic servo system caused by the differential pressure discharge characteristic of a proportioning valve or a servo valve are reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of motors, relates to an electro-hydraulic servo system, and relates to a hydraulic cylinder control system and a control method of a direct-drive servo pump controlled electro-hydraulic hybrid drive. Background technique [0002] When the current electro-hydraulic servo system is working, a series of valves with various functions, especially proportional valves and servo valves, must be used to control the pressure, flow rate, and flow direction of the working fluid, so that each hydraulic cylinder can complete its due process according to the process requirements. Actions. At the same time, there are unavoidable defects such as complex structure, high energy consumption, serious heat generation, high noise, large vibration, high oil filtration accuracy, and large throttling loss. [0003] The pump-controlled hydraulic control system has revolutionized the original control mode from valve control to pump c...

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Problems solved by technology

[0006] The problem to be solved by the present invention is: the pump-controlled hydraulic control system theoretically has the advantages of energy saving and environmental protection, high synchronization accuracy, and fast response, but in practical applications, the existing technology has no problem with the flow asymmetry of the pump-controlled hydraulic control system. Appropriate solution, complex system control, low energy efficiency, low cost performance

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