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.