Load Sensing Hydraulic System and Power Matching Control Method, Device and System

Abstract

The invention relates to the technical field of engineering machinery, and discloses a load-sensitive hydraulic system, a power matching control method, device and system and an engineering machine. The load-sensitive hydraulic system, the power matching control method, device and system and the engineering machine are used for improving the control conformance, the dynamic responsiveness and the stability of the load-sensitive hydraulic system and the control performance of power matching. The load-sensitive hydraulic system comprises a variable pump assembly, a main control valve set, an actuator, an overflow valve and a flow control valve set. An oil inlet of the main control valve set is communicated with an oil outlet of the variable pump assembly, and a load-sensitive feedback oil path is arranged between a control oil port of the main control valve set and a control oil port of the variable pump assembly. Two oil ports of the actuator are communicated with two working oil ports of the main control valve set respectively. An inlet oil path of the overflow valve is communicated with the load-sensitive feedback oil path, and a switch valve is arranged on the inlet oil path of the overflow valve. An inlet oil path of the flow control valve is communicated with the load-sensitive feedback oil path, and the flow control valve comprises a proportional throttle valve and a first pressure-compensated valve arranged on an inlet oil path of the proportional throttle valve.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a load-sensitive hydraulic system, a power matching control method, device, system and construction machinery. Background technique [0002] In order to reduce the cost of the engine and save energy consumption, when selecting the engine type, it is usually not selected according to the maximum power demand of the engine, but according to the power demand that can meet most common working conditions. When the load power of the engine exceeds the maximum output power of the engine, the matching control of the hydraulic system and the limit power of the engine can not only ensure the normal operation of the main engine without shutting down, but also maximize the use of engine power and improve the energy saving of the system. [0003] The power matching control technology is an intelligent electro-hydraulic control technology that automatically adjusts the hydraulic...

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Problems solved by technology

[0004] The inventors of the present application found that when the limit power matching control is performed on the existing load-sensing hydraulic system, the adjustment ability of the existing power matching control method is limited, and the relief valve used to set the pressure of the load-sensing feedback oil circuit and the There is leakage in the throttle valve of the load-sensitive feedback oil circuit pressure relief, which leads to problems such as poor consistency, poor dynamic response, poor stability, and insufficient power utilization of the hydraulic system in the control of the hydraulic system, which seriously restricts the control of the product. sex and reliability

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