Power and backpressure oil electro-hydraulic rigid and flexible combined adjustment and control multi-actuator system

Abstract

The invention discloses a power and backpressure oil electro-hydraulic rigid and flexible combined adjustment and control multi-actuator system. According to the combined adjustment and control multi-actuator system, pressures of oil returning cavities of all actuators, except the actuator with the maximum load, are utilized and controlled through energy regeneration, so that pressures of oil inlet cavities of all the actuators are the same; the pressure differences of all control valve openings are the same, so that the pressure and flow rate of a hydraulic pump are matched with all the hydraulic actuators; and throttling losses, caused by the load differences, of the multi-actuator system are eliminated. By controlling the pressures of the oil returning cavities of the actuators, workingpoints of a power source can be adjusted and controlled; in addition, an adjustment and control unit can be in nonrigid connection with the power source, and the hybrid power function is further expanded to kinetic potential recycling and throttling loss reduction; the energy saving effect is greatly improved, and the investment recovery cycle is greatly shortened; and the power and backpressureoil electro-hydraulic rigid and flexible combined adjustment and control multi-actuator system can be applied and popularized conveniently.

Description

technical field [0001] The invention relates to a multi-actuator control system in hydraulic control technology, in particular to an electro-hydraulic control system used in engineering equipment to reduce pressure loss and power matching of multi-actuator systems. Background technique [0002] Various types of non-road mobile equipment such as construction machinery, road construction machinery, mining machinery, forestry machinery, and agricultural machinery currently use internal combustion engines to drive hydraulic pumps as power sources, and distribute and transmit power through multi-way valves and pipelines to 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 efficiency of the whole ...

AI Technical Summary

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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