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42 results about "Open-loop controller" patented technology

In an open-loop controller, also called a non-feedback controller, the control action from the controller is independent of the "process output", which is the process variable that is being controlled. It does not use feedback to determine if its output has achieved the desired goal of the input command or process "set point".

Open-loop fuzzy control method for piezoelectric ceramic driver hysteresis system

The invention discloses an open-loop fuzzy control method for a piezoelectric ceramic driver hysteresis system and relates to the field of control in super-precision optical application. The open-loop fuzzy control method solves the problems that an open-loop controller of a hysteresis model structure of an existing PZT hysteresis system is poor in adaptability and can not effectively compensate for the influence of related hysteresis characteristics on system control accuracy. The method comprises the steps of acquiring input data and output data of the piezoelectric ceramic driver system, determining membership function distribution of input variables, identifying parameters of the conclusion part of a fuzzy hysteresis model through the recursive least-squares method to obtain a hysteresis inverse model capable of being analyzed and expressed eventually, establishing an open-loop fuzzy controller according to the hysteresis inverse model and compensating for the hysteresis characteristics of the piezoelectric ceramic driver system so as to achieve accurate control over the piezoelectric ceramic driver system. The fuzzy model adopted in the method is high in modeling accuracy, high in generalization ability and capable of being analyzed and expressed reversely; the inverse model is low in computation complexity, and the hysteresis compensation open-loop fuzzy controller established according to the inverse model is easy to realize and capable of being used conveniently in real time.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Active clearance control method and system

The invention relates to an active clearance control method and system. The method comprises the steps that the current state of an aero-engine is judged, and if the aero-engine is in a steady state, a closed-loop control process which is achieved by a closed-loop controller and based on clearance-related parameter adjustment and an actuator affecting turbine clearance is selected and used; if the aero-engine is in a transition state, an open-loop control process which is achieved by an open-loop controller and based on clearance-related parameter adjustment and the actuator is selected and used. According to the method, when the aero-engine is in the steady state, the closed-loop control process based on clearance-related parameters is adopted to ensure high control accuracy of the turbine clearance in the steady state; when the aero-engine is in the transition state, the open-loop control process based on the clearance-related parameters is adopted to make turbine clearance control respond more quickly in the transition state and avoid frequent actuation, caused by slow response, of the actuator affecting the turbine clearance; as a result, high control accuracy of the turbine clearance in the transition state is acquired, and the control effect of active clearance is improved.
Owner:AECC COMML AIRCRAFT ENGINE CO LTD

Manufacturing method of bearingless asynchronous motor neural network generalized inverse decoupling controller

The invention discloses a manufacturing method of a bearingless asynchronous motor neural network generalized inverse decoupling controller, and the manufacturing method comprises following steps that a static neural network of ten input nodes and four output nodes and six linear links are used for forming a neural network generalized inverse of four input nodes and four output nodes, the neural network generalized inverse is arranged in front of a composite controlled target to form a generalized pseudo-linear system, the generalized pseudo-linear system is decoupled and linearized into two displacement two-step pseudo-linear subsystems, one rotation speed one-step pseudo-linear subsystem and one magnetic chain one-step pseudo-linear subsystem; and the neural network generalized inverse, two Clark inverse transformers and two current tracking-type inverters collectively form the neural network generalized inverse decoupling controller, not only is the dynamic decoupling between a radial displacement system and a rotation speed system and between the radial suspension forces of the bearingless asynchronous motor realized, but also the controller can be used as a nonlinear open-loop controller to be directly used, and the stable suspension running of a bearingless asynchronous motor rotor can be guaranteed.
Owner:HUAWEI TEHCHNOLOGIES CO LTD

Unmanned ship navigation control method and system, storage medium and computer equipment

PendingCN110426958ATo achieve the purpose of track controlAdaptive controlLoop controlLongitude
The invention discloses an unmanned ship navigation control method and system, a storage medium and computer equipment. According to the system, actual longitude and latitude information acquired by an attitude sensor and set longitude and latitude serve as input and are transmitted to a navigation path controller, and an LOS angle is obtained through an LOS guidance algorithm and serves as a setcourse angle to be transmitted to a course controller based on trajectory linearization. The course controller is divided into a slow loop controller and a fast loop controller. The set course angle and the actual course angle acquired by a sensor magnetic compass serve as input and are transmitted into the slow loop controller, and due to the cooperation of a first pseudo-inverse system module and a first stable regulator module of the slow loop controller, output parameters of the slow loop controller are obtained and transmitted into the fast loop controller. The actual rudder angle obtained by a rudder angle detection device serves as input and is transmitted into the fast loop controller, and by means of a second pseudo-inverse system module and a second stable regulator module of thefast loop controller, fast loop control input is obtained and acts on a stern machine propelling device of an unmanned ship so that the purpose of indirectly achieving navigation path control can beachieved by controlling the course.
Owner:DALIAN MARITIME UNIVERSITY

Externally controlled two-position two-way pilot type proportional valve

ActiveCN106246630AImproved low pressure controllabilityImprove stabilityServomotor componentsElectronic switchFuel tank
The invention discloses an externally controlled two-position two-way pilot type proportional valve which is applicable to a hydraulic control system. The externally controlled two-position two-way pilot type proportional valve is characterized in that a main valve is provided with three oil ports; the displacement of a main valve core is controlled by pressure oil from the control oil port; when the flow of oil passing through an oil groove of the main valve core is consistent with the flow of oil passing through the pilot type proportional valve, the opening degree of one working oil port reaches a stable state; an electronic switch is arranged between an open loop controller and a feedback signal controller and is controlled by a pilot displacement sensor or a main valve displacement sensor; the control oil port is connected with a constant-pressure source; the dynamic characteristic of the main valve is not affected by the pressures of the working oil ports of the main valve; the low-pressure controllability, the high-pressure stability and the dynamic characteristic of the valve are improved; and oil is piloted back into an oil tank, so that the power of a pilot level is reduced. The externally controlled two-position two-way pilot type proportional valve is simple in structure, easy to popularize and apply, and applicable to the hydraulic control system.
Owner:TAIYUAN UNIV OF TECH

Dynamic negative-pressure servo control system and method based on symmetric air cylinders

The invention discloses a dynamic negative-pressure servo control system and method based on symmetric air cylinders, and belongs to the field of air pressure simulation of high-altitude vehicles. Thedynamic negative-pressure servo control system comprises an electromechanical transmission module, a pneumatic module, a control module and a data collection module. The electromechanical transmission module adopts a motor direct drive mode, makes a servo motor directly connected with a ball screw, the pneumatic module utilizes the symmetric negative-pressure air cylinders as pressure generators,the control module is used for controlling and switching different pressure input signals and pressure open loop controllers, and the data collection module collects pressure of controlled cavities of the negative-pressure air cylinders and displacement of cylinder pistons through pressure sensors and displacement sensors and transmits the pressure of the controlled cavities of the negative-pressure air cylinders and the displacement of the cylinder pistons to an industrial personal computer. The invention further discloses a dynamic negative-pressure servo control method based on the symmetric air cylinders. By the adoption of the dynamic negative-pressure servo control method, dynamic negative-pressure servo control is achieved rapidly and accurately, meanwhile, the dynamic negative-pressure servo control device has the advantages of being simple in structure and easy to implement, and is particularly suitable for air pressure simulation equipment for spacecraft.
Owner:HUAZHONG UNIV OF SCI & TECH

Fast erection control system

The invention relates to a fast erection control system which comprises an oil supply unit, multiple stages of hydraulic cylinders, a plurality of auxiliary power branches and a main power branch, andthe auxiliary power branches and the main power branch are connected in parallel. A switching sensor, an open loop controller, a closed loop controller and a switching controller are included; each stage of hydraulic cylinder of the multiple stages of hydraulic cylinders communicates with the oil supply unit through the main power branch and one of the auxiliary power branches, and extends out step by step to complete erection of an erection arm; the switching sensor is used for monitoring the erection state of the erection arm to feed back the erection state to the switching controller in real time; the open loop controller and the closed loop controller are connected in parallel to be then connected with the switching controller in series; and the switching controller is used for selecting parameters according to the erection state of the erection arm to adjust the control state of the main power branch. The fast erection control system solves the problem that the fast erection system based on an energy accumulator type auxiliary power source is large in pressure fluctuation and long in stabilization time in the erection process.
Owner:BEIJING MECHANICAL EQUIP INST
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