Stepped variable system based on digital hydraulic pump/motor double-mode performance characteristic and control method of stepped variable system

Abstract

The invention discloses a stepped variable system based on a digital hydraulic pump / motor double-mode performance characteristic and a control method of the stepped variable system. The stepped variable system comprises at least two hydraulic pumps / motors which are different in discharge capacity and at least two reversing valves; an opening P of each hydraulic pump / motor is connected with the opening P of the corresponding reversing valve; an opening T of each reversing valve is connected with the opening T of the corresponding hydraulic pump / motor; each hydraulic pump / motor is not directly connected with an oil tank but is connected with the oil tank via an opening B of the corresponding reversing valve; thus, the each hydraulic pump / motor can be switched between two state modes; when each reversing valve works at a left position, the opening T of the corresponding hydraulic pump / motor is used for sucking oil from the oil tank via the corresponding reversing valve, and the corresponding hydraulic pump / motor is in a hydraulic pump state; and when each reversing valve works at a right position, high-pressure oil discharged by the corresponding hydraulic pump / motor which is coaxially in the hydraulic pump state enters the corresponding hydraulic pump / motor via the opening P of the corresponding reversing valve in order to drive the corresponding hydraulic pump / motor to work in amotor state so that the action smoothness and stability of the stepped variable system are improved, thus the service life of each mechanical part, the reliability of the system and the comfort of anoperator are improved.

Description

technical field [0001] The present invention relates to the field of digital hydraulics, in particular to a stepped variable system based on the dual-mode working characteristics of a digital hydraulic pump / motor and its control method, and in particular to a flow control that does not require high precision but requires high reliability, low cost, and The occasions where the requirements for oil cleanliness are low, and the impact and chattering of the traditional stepped variable system are relatively large, and the service life of mechanical components and the comfort of the driver are difficult to meet the requirements. Background technique [0002] Digital hydraulics is an emerging technology that obtains system output through real-time control of discrete variable hydraulic components. Compared with traditional hydraulic variable control technology, it has the advantages of low cost, high response, easy control, and high efficiency. It has been favored by the hydraulic ...

AI Technical Summary

Problems solved by technology

Its components are remanufactured from serial hydraulic pumps / motors, which have the advantages of strong self-priming ability, mature localization technology, and low price. Shock and chattering of the system, on the one hand, may easily lead to a reduction in system reliability, and on the other hand, may also deteriorate the comfort of the operator. This defect is a major problem that limits the development of stepped variable technology.

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