Energy storage and release control method of secondary regulation transmission system under non-constant pressure network

Abstract

The invention relates to an energy storing and releasing control method for a secondary regulation transmission system in a non-constant pressure network, which comprises a pressure limiting energy storing module and one or more hydraulic energy storing modules, and is characterized in that the pressure limiting energy storing module and the hydraulic energy storing modules are sequentially and parallel connected at a high-pressure oil mouth of a secondary element, the secondary element is connected with a load, the working condition of the secondary element is controlled by a control module of the secondary element; when a movement load starts and accelerates or a gravity load lifts, the control module of the secondary element adjusts the secondary element connected with the pressure limiting energy storing module and the hydraulic energy storing modules to the working condition of a hydraulic motor so as to release energy; when the movement load brakes or the gravity load falls off, the control module of the secondary element adjusts the secondary element connected with the pressure limiting energy storing module and the hydraulic energy storing modules to the working condition of a hydraulic pump so as to recycle and store energy. Compared with the prior art, the control method of the invention realizes the control of energy recycling, storing and releasing processes, has simple, accurate and reliable operation, and improves the recycling effect and efficiency of energy.

Description

(1) Technical field [0001] The invention relates to an energy storage and release control method, in particular to an energy storage and release control method for a secondary regulation transmission system under a non-constant pressure network. (2) Technical background [0002] The secondary regulation hydrostatic transmission system generally works under the constant pressure network, which is a pressure coupling system. The pressure of the hydraulic accumulator used for energy storage is allowed to vary in a small range, which limits energy recovery and reuse. To this end, researchers at home and abroad have proposed several solutions. One is to use a hydraulic transformer to adjust the pressure to expand the range of system operating pressure; Under the network, the working range of the system pressure has also increased. [0003] However, under the non-constant pressure network, since the secondary regulation hydrostatic transmission system generally does not have a sp...

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Problems solved by technology

[0002] The hydrostatic transmission system with secondary adjustment generally works under the constant pressure network, which is a pressure coupling system. The pressure of the hydraulic accumulator used for energy storage is allowed to vary in a small range, which limits energy recovery and reuse.

[0003] However, under the non-constant pressure network, since the secondary regulation hydrostatic transmission system generally does not have a special oil supply hydraulic pump, the oil charging pressure of the hydraulic accumulator is greatly affected by the load change, such as the operating conditions of buses, loaders, etc. (Driving speed, load quality, etc.) change frequently, and the kinetic energy they have varies, so that the energy recovered and stored can be more or less. The pressure directly determines its utilization effect. The lower the oil filling pressure, the worse the utilization effect when starting and accelerating loads such as buses and loaders; moreover, in the existing secondary regulation hydrostati

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