Active control system and control method for pressure of hydraulic accumulator

Abstract

The invention discloses an active control system and control method for the pressure of a hydraulic accumulator. The active control system comprises high-speed switch gas valves, a pressurizing cylinder, the hydraulic accumulator, a gas bottle, a two-position two-way air-operated reversing valve, a controller and the like. When the hydraulic accumulator is in an oil liquid recycling state, nitrogen in a gas bag is gradually pressed into the gas bottle through the pressurizing cylinder while hydraulic oil enters the hydraulic accumulator, and then active control over the pressure of the hydraulic accumulator is achieved; when the hydraulic accumulator is in an oil liquid releasing state, high-pressure gas in the gas bottle enters the gas bag of the hydraulic accumulator through the high-speed switch gas valves to press stored oil liquid into a system loop, and then the pressure of the hydraulic accumulator is controlled to be at a constant value. According to the active control system and control method, active control over the pressure of the hydraulic accumulator can be achieved, the problem that in a hydraulic energy recycling system, the recycled pressure oil releasing process is uncontrollable and incomplete due the fact that the pressure of the hydraulic accumulator is passively controlled is solved, and the energy recycling rate and utilizing rate are increased.

Description

technical field [0001] The invention relates to a pressure control system characterized by electro-hydraulic gas control technology, in particular to an active pressure control system of a hydraulic accumulator. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution worldwide, it is of great practical significance to study the energy recovery of construction machinery. Hydraulic excavator is a kind of engineering machinery with relatively large power, but its total utilization rate of energy is low, so energy recovery technology has received attention from all aspects. [0003] According to the type of energy storage components, the forms of energy recovery currently used in construction machinery can be divided into electrical and hydraulic. Among them, hydraulic energy recovery has been widely applied and researched due to its high power density, fast storage and release of pressure oil, and simple structure. Th...

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Problems solved by technology

[0005] In view of this, the present invention aims at the problem of active pressure control of hydraulic accumulators, and its main purpose is to provide an active pressure control system for hydraulic accumulators, which can effectively solve the problem of hydraulic accumulator recovery and release pressure being affected by circuit pressure and Improve the efficiency and reuse rate of hydraulic energy recovery by solving the problem of the impact of air bag pressure

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