Electrohydraulic distributing control system for motion of several executors in engineering machinery
A multi-actuator, construction machinery technology, applied in mechanical equipment, fluid pressure actuating devices, servo motors, etc., can solve the problems of low utilization rate of pump output flow, failure of split ratio control, slow movement speed, etc. Effects of digital control methods
Inactive Publication Date: 2002-10-23
ZHEJIANG UNIV
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Problems solved by technology
However, when the inertial loads driven by the various actuators are quite different, the one with the smaller inertia cannot get all the required flow and moves slowly; while the one with the larger inertia cannot quickly reach its given speed due to its speed. Fixed value, so its shunt flow can only be bypassed from the safety valve, which causes waste of this part of flow and reduces the utilization rate of pump output flow
In the combined control of large and small inertial loads, there are common problems such as the failure of the split ratio control and the low utilization rate of the pump output flow due to insufficient output flow of the pump.
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[0015] Such as figure 2 As shown, the oil supply of the hydraulic pump is respectively connected with several electro-hydraulic control units driving the actuators and the relief valve through the hydraulic oil circuit, and the load pressure of several electro-hydraulic control units is connected with the A / D analog input terminal is connected, and the corresponding number of operation instructions and corrected operation instructions of several electro-hydraulic control units are also connected with the A / D analog input terminal and D / A module of the load sensing controller with electrical signals. The load-sensing controller has another D / A analog output terminal to connect the load-sensing correction signal to the variable mechanism of the hydraulic pump or the control terminal of the relief valve with an electrical signal.
[0016] The flow rate for each electro-hydraulic control unit is based on the input operation instructions and is corrected by the electro-hydraulic ...
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The electro-hydraulic digital flow distribution control system with several executors is characterized by that the hydraulic pump is respectively connected with electro-hydraulic control units of several drive executors and overflow valve by means of oil pipeline, the load pressure of every electro-hydraulic control unit is connected with A / D interface of load sense controller by means of electric signal, and the operation instruction before and after correction also can be connected with A / D and D / A interfaces of load sense controller respectively by means of electric signal, and another D / Ainterface of the load sense controller can output load sense corrected value, and said corrected value also is connected with variable mechanism of the hydraulic pump or control end of overflow valveby means of electric signal.
Description
technical field [0001] The present invention relates to systems in which the resulting motion is directly related to the output of a positive displacement pump. Background technique [0002] Various multi-actuator load-sensing systems (whether it is a mechanical-hydraulic load-sensing system or an electro-hydraulic load-sensing system) used in traditional construction machinery, such as figure 1 As shown, the hydraulic pump supplies oil to each electro-hydraulic control unit; each electro-hydraulic control unit leads the load pressure to the high-pressure selection valve, and the high-pressure selection valve selects the highest pressure and outputs it to the load-sensitive oil circuit; the pressure of the load-sensitive oil circuit is used It is used for the control of hydraulic pump variable mechanism or overflow valve; the operation command is directly connected to each electro-hydraulic control unit by circuit for control. The method of split...
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IPC IPC(8): F15B11/16F15B13/02F15B13/06
Inventor 顾临怡王庆丰
Owner ZHEJIANG UNIV