Back pressure and power oil electro-hydraulic composite control multi-actuator system

Abstract

Disclosed is a multi-actuator system for electrohydraulic compound control of backpressure and power oil. A power control unit, a backpressure control unit, a controller, a switching control valve, a hydraulic control one-way valve and a pressure sensor are additionally arranged, pressure of a return oil cavity of an actuator is controlled by an electrical regeneration mode of hydraulic energy, the situation that pressure differentials of actuator control valves of the multi-actuator system under large load differential condition are identical is realized, output pressure and flow of a hydraulic pump are matched with the actuators as required, throttling loss generated from load inconformity is removed, problems that an engineering mechanical hydraulic tank is small resulting in heating and aging of hydraulic oil are solved, discharging is reduced, and energy efficiency is improved.

Description

technical field [0001] The invention relates to a multi-actuator control system in hydraulic control technology, in particular to an electro-hydraulic control technology used for power matching of engineering equipment and reducing pressure loss of a multi-actuator system. Background technique [0002] At present, various types of non-road mobile equipment such as construction machinery, road construction machinery, mining machinery, forestry machinery, and agricultural machinery generally use internal combustion engines to drive hydraulic pumps as power sources, distribute and transmit power through multi-way valves and pipelines, and control The hydraulic system with compound actions of multiple actuators is also the most widely used and most important field of hydraulic technology. It is characterized by high power density, compact structure, good maneuverability and strong environmental adaptability, but the fatal disadvantage is low energy utilization. The energy effici...

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Problems solved by technology

In the published invention patent "Energy-saving shield segment assembly and positioning electro-hydraulic control system using load-sensing technology, CN103032396A", the multi-actuator system often has the characteristics of a wide range of load changes. By adopting the load-sensing control principle, the The output pressure of the hydraulic pump always changes with the change of the load, avoiding the energy waste caused by the original system always supplying oil at the highest working pressure, and reducing the throttling loss and overflow loss, but because the output pressure of the pump can only match the highest For multi-actuator systems, the throttling loss of low-load actuator control valves caused by large load differences can never be eliminated, and this part of the loss is precisely the most important source of energy consumption for multi-actuator systems, accounting for 35%~39% of engine output power

[0003] In addition, the load of construction machinery varies in a large range during actual operation, causing the power source to often operate in a low-efficiency working area, which increases the emission and energy consumption of the power source. Therefore, it is necessary to use torque coupling to add Other forms of power sources are used to match the original power sources, such as electric / generators in the form of hybrid electric power or hydraulic pumps / motors in the form of hydraulic hybrid power. The power of the main power source, thereby improving the energy efficiency of the main power source, and under heavy load conditions, the auxiliary power source releases the absorbed energy and assists the main power source to drive the load to do work together, but the existing hybrid mode, the auxiliary power source The energy provided will be lost through the secondary throttling of the control valve, and the function is only to match the operating point of the engine. After adding this unit, the cost of the whole machine will increase a lot, and the cost recovery period will be longer, which will affect the popularization and application

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