Load difference oil-electro-hydraulic composite back pressure control dual actuator system

Abstract

The invention discloses a load difference oil-electro-hydraulic composite back pressure regulation double-actuator system. A power regulation unit, a back pressure regulation unit, a controller, conversion control valves, pilot operated check valves and pressure sensors are additionally arranged, an energy recycling structure is adopted, the pressures of oil return cavities of actuators expect a maximum load actuator are controlled to enable the differential pressures of oil inlet cavities of all the actuators and all control valve ports to be equal, thus, the pressure and flow of a hydraulic pump are matched with all the actuators, and throttling losses of multi-actuator systems caused by load differences are eliminated. Defects in the prior art are effectively overcome, and the double-actuator system has the advantages of high energy efficiency, low emission, kinetic energy recycling, power matching integration and the like in many aspects.

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 for low differential loss loss of a multi-actuator system used in engineering equipment. 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 machine...

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

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