Nonlinear flow modeling and compensating method for load port independent hydraulic system

A hydraulic system and flow modeling technology, applied in the direction of flow control, non-electric variable control, control/regulation system, etc., can solve problems such as coil electromagnetic force nonlinearity, manufacturing precision leakage, etc., to achieve small calculation and reduce workload , quickly modeling the effects of uncertainty

Active Publication Date: 2021-06-08
ZHEJIANG UNIV
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Problems solved by technology

This may be caused by the non-linearity of the electromagnetic force of

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  • Nonlinear flow modeling and compensating method for load port independent hydraulic system
  • Nonlinear flow modeling and compensating method for load port independent hydraulic system
  • Nonlinear flow modeling and compensating method for load port independent hydraulic system

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[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples.

[0044] Such as figure 1 As shown, the load port independent hydraulic control system includes a system flow providing portion mainly composed of a motor 8 and a hydraulic pump 7, mainly by a first proportional control valve 1, a third proportional control valve 3, a second proportional control valve 2, fourth The flow control portion composed of the proportional control valve 4, and the actuator portion mainly composed of a hydraulic cylinder and the load; the hydraulic pump 7 and the motor 8 are connected, and the motor controls the hydraulic pump operation, the four proportional control valves of the flow control portion are connected in parallel The hydraulic pump outlet, the fuel tank and the hydraulic cylinder 5 are controlled, respectively, respectively, respectively, separately controlling the flow rate of the two cavities in and out of...

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Abstract

The invention discloses a nonlinear flow modeling and compensating method for a load port independent hydraulic system. The method comprises the following steps of initializing a real-time signal sampling period and system parameters; according to a sensing system in a load port independent hydraulic control system, collecting effective system signals such as pressure of two cavities of a hydraulic oil cylinder, pressure of an outlet of a hydraulic pump, operation displacement and a speed of a load and the like in the load port independent hydraulic control system; establishing a proportional valve model of a proportional control valve, and further establishing a hydraulic system model for identification of the load port independent hydraulic control system; inputting the effective system signals into the hydraulic system model for identification, and acquiring system parameters and the like through identification; and acquiring a compensation amount according to processing of system parameters and the like for compensation control. The method has an expected valve flow compensation function, and the system control precision can be improved.

Description

technical field [0001] The invention relates to a flow compensation method in the field of high-precision hydraulic control, in particular to a non-linear flow modeling and compensation method for an independent hydraulic system at a load port. Background technique [0002] Electro-hydraulic systems are widely favored in the industry due to their high power-to-weight ratio, high load capacity and high durability. For electrohydraulic motion control systems, control accuracy and operational efficiency are the two main characteristics. In order to achieve high control accuracy, hydraulic valve flow control system is a common choice. However, due to the large throttling loss, the energy efficiency of the traditional four-way valve controlled hydraulic system is very low. This is due to the mechanical coupling of the oil inlet and outlet. Unlike traditional four-way valve control systems, inlet and outlet flow are separated in load port independent systems. In such a system,...

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Application Information

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IPC IPC(8): G05D7/06
CPCG05D7/0635
Inventor 陈正李琛姚斌
Owner ZHEJIANG UNIV
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