Hydraulic system regulating equipment, method, power matching control system and construction machinery
A hydraulic system and equipment technology, applied in the field of power matching control system and construction machinery, can solve the problems of slow response speed of the control system, poor system control compliance, and inability to adjust the control system in time.
Active Publication Date: 2016-02-10
ZOOMLION HEAVY IND CO LTD
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Problems solved by technology
[0004] At present, the control system used to adjust the hydraulic system of the variable variable pump usually has a slow response speed. When a sudden change occurs, the limit load or the load changes rapidly, the system control compliance is poor, and the control system cannot adjust the load in time to make the engine meet the load power demand. The probability of engine flameout is high, which seriously affects the reliability of the system
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[0025] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0026] figure 1 A schematic diagram showing the principle of the variable pump hydraulic system of the single actuator system of the hoisting mechanism of the crane, as shown in figure 1 As shown, the system is mainly composed of three parts: variable pump system 1, main control valve system 2 and winch mechanism system 3. When the main valve 2.2 is opened and the system has a flow demand, the variable mechanism of the pump (load sensitive flow valve 1.2 and pressure reducing valve 1.3) will automatically change the displacement of the main pump 1.1 to control the output flow.
[0027] The preset pressure difference Δp is composed of two parts, one is the pres...
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The invention discloses hydraulic system adjusting equipment, a hydraulic system adjusting method, a hydraulic system power matching control system and engineering machinery. The equipment comprises a feedback controller, a feedforward controller and an output device. The feedback controller is used for acquiring actual torque and target torque of an engine, and performing PID (proportion integration differentiation) adjustment on the difference between the actual torque and the target torque to calculate a first control current. The feedforward controller is used for acquiring the preset differential pressure of a variable pump and calculating a second control circuit according to the preset differential pressure. The output device is connected with the feedback controller and the feedforward controller respectively, and is used for outputting a control current to a hydraulic system to adjust absorbing power of the hydraulic system, wherein the control current is based on the sum of the first control current and the second control current. Through the feedback and feedforward combined control strategy, accurate adjustment can be guaranteed, system response speed can be increased, and matching performance of the engine and variable pump hydraulic system under the suddenly-changed loading conditions can be improved.
Description
technical field [0001] The invention relates to the field of engineering machinery, in particular to an engine-variable pump hydraulic system adjustment device and method, a power matching control system for the engine-variable pump hydraulic system, and construction machinery. Background technique [0002] In construction machinery (such as cranes), when matching the design of the engine and hydraulic system, for the sake of overall machine economy (such as component cost, fuel consumption, etc.), it is often not necessary to meet the requirements of most operating conditions. Make the output power curve of the engine always higher than the absorption power curve of the pump (hydraulic system), otherwise the rated power of the engine will be selected very large, which is not conducive to energy saving and reduction of manufacturing and use costs, resulting in great waste. Therefore, when the crane performs some heavy-duty operations, if the overload protection is not adopte...
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IPC IPC(8): F02D41/00F04B49/00F15B11/02F15B21/00
Inventor 刘伟李迎兵李英智
Owner ZOOMLION HEAVY IND CO LTD