65 results about "Intermittent control" patented technology

The embodiment of the invention provides a coupling network asynchronous dynamic intermittent safety control method and system, and the method comprises the steps: obtaining multiple attack signals comprising an injection attack signal and a replacement attack signal after building a dynamic model of a following network, a target network and a state error variable; and setting an intermittent controller according to the dynamic network model and the multiple attack signals, and setting a dynamic mechanism based on an exponential function to convert a state error variable into an interval control function. Wherein the interval control function is used for realizing security mean square synchronization control between the following network model and the target network model. According to the method, the asynchronous anti-attack intermittent dynamic cooperative control strategy oriented to the complex coupled network can be constructed based on an average intermittent control rate and dynamic event trigger threshold coupling method by utilizing a node self-adaptive dual spoofing attack probability model, and the problems of difficulty in multi-attack modeling and insufficient control strategy collaboration can be relieved.

The invention belongs to the field of aero-engine anti-icing system design, and discloses an aero-engine anti-icing system and a design method. The system comprises an anti-icing component, a heat supply structure, a control assembly and a monitoring assembly, wherein the anti-icing component selects an air inlet support plate and a rectification cover hood; the heat supply structure introduces air from two air flows of the combustion chamber and conveys hot air through a pipeline and an air collection cavity; the control assembly adopts intermittent control, and system management and control are achieved through a pressure reducing valve and a digital electronic controller; the monitoring assembly comprises a pressure sensor and a thermocouple. The design method sequentially comprises the steps of anti-icing component and type determination, anti-icing structure design, control scheme design, simulation analysis, test verification and the like. A complete forward design path is provided, the anti-icing efficiency is improved, the structure is simplified, safe and stable operation of the engine is guaranteed, and the method can be widely applied to design and improvement of an anti-icing system of the aero-engine.

The invention discloses a switching control method based on SPWM soft start and a pulse type load LLC resonant converter. The converter mainly comprises an LLC resonant converter, an H-bridge inverter circuit and a load of the H-bridge inverter circuit, and the control method comprises the following steps: setting k-level SPWM modulation in a starting stage to realize smooth soft start of output voltage (k is any positive integer); the load state is accurately judged through an H-bridge switching logic unit, and Burst intermittent control and linear frequency control are adopted for no-load and full-load in a steady state respectively; during load switching, a nonlinear SOTC optimal trajectory controller is adopted to perform two-pulse optimal control, so that the state is transited to a new mode along the shortest trajectory, and a dynamic response optimizer is introduced to compensate the switched frequency according to the state radius error so as to suppress secondary voltage fluctuation. The problems of slow dynamic response, large output voltage fluctuation and the like when traditional linear control faces a pulse type load LLC resonant converter are solved, and the stability and the anti-interference capability of the output voltage of the system are improved.

The embodiment of the present application provides a method and system for asynchronous dynamic intermittent safety control of a coupled network. The method can obtain multiple attack signals including injection attack signals and replacement attack signals after establishing a dynamic model of a follower network, a target network, and a state error variable, and set an intermittent controller according to the dynamic network model and the multiple attack signals, and then set a dynamic mechanism based on an exponential function to convert the state error variable into an interval control function. The interval control function is used to achieve safe mean square synchronization control between the follower network model and the target network model. The method can utilize a node-adaptive double deception attack probability model, based on the average intermittent control rate and the dynamic event trigger threshold coupling method, to construct an asynchronous anti-attack intermittent dynamic collaborative control strategy for complex coupled networks, which can alleviate the difficulties in modeling multiple attacks and the lack of coordination of control strategies.

The invention belongs to the related technical field of power electronic converters, and discloses an LLC resonant converter light load smooth transition control method and system, and the method comprises the steps: carrying out the PI calculation according to the real-time output voltage of an LLC, and obtaining a pre-output frequency; if the pre-output frequency is greater than or equal to the maximum output frequency, entering a second working mode; at the moment, the actual output frequency is set to be the maximum output frequency, and the duty ratio of intermittent control is set according to the exceeding degree of the pre-output frequency relative to the maximum output frequency; a PFM modulation signal is generated according to the actual output frequency, a burst signal is generated according to the intermittent control duty ratio, and a driving signal is generated according to the PFM modulation signal and the burst signal to control the LLC resonant converter. The control requirements of the PFM modulation mode under the normal working condition and the burst mode under the light-load working condition can be met by using one set of PI control parameters, and smooth transition of light-load control is achieved.

The application discloses a generator lithium battery cooperative control method and system, and belongs to the technical field of electric control of hybrid electric vehicles. The method collects lithium battery current, SOC state and temperature data in real time, establishes a dynamic Imax threshold after standardization processing, constructs a multi-physical field coupling model, accurately calculates the high-power duration of the generator and outputs optimal intermittent control parameters, realizes intelligent cutting and recovery of the charging loop through MOSFET switches, collects operation data to feedback and optimize model parameters, and forms a closed-loop learning system. The application solves the technical problems of response lag and split electric heat management of the traditional method, realizes double-target optimization of the extension of the service life of the generator and the improvement of the charging efficiency of the lithium battery, reduces the daily average high-load time of the generator, and improves the cycle life of the lithium battery.

The invention relates to a multi-mobile-robot intermittent formation tracking control method for denial of service attack, and belongs to the technical field of multi-mobile-robot control. Aiming at the problems of poor anti-interference performance, waste of communication computing resources, uncontrollable convergence time and strong model dependence in the prior art, a remote control terminal and ultrasonic radio station cooperative anti-attack switching scheme is provided, a distributed observer is adopted to realize leader state estimation, resource consumption is reduced by combining intermittent communication and an intermittent control mechanism, and the reliability of the system is improved. And a preset time adjustment function ensures user-defined convergence, and a reinforcement learning network optimization control strategy is introduced. The anti-attack capability and the self-adaptive performance of the system are improved, high-precision formation tracking is realized, the communication and calculation burden is remarkably reduced, and the expansibility is high.

The invention discloses a self-triggering self-adaptive dynamic programming method based on model prediction, which belongs to the field of optimal control, and comprises the step of developing a self-triggering self-adaptive dynamic programming algorithm based on an iterative model prediction process for an unknown nonlinear system. A trigger condition function is designed through Lyapunov stability analysis, intermittent control only depending on the previous trigger state is achieved, and communication traffic is reduced. A three-network architecture composed of a model network, an evaluation network and an execution network is designed. Then, a rolling optimization mechanism is provided, infinite time domain optimization is decomposed into finite time domain sub-problems, and calculation time consumption is reduced; and finally, providing a simulation result to verify the effectiveness of the proposed method.

Disclosed in the present application are a control circuit and a control method for a resonant converter, and a storage medium. The control circuit comprises: a detection module, which is configured to detect an input signal and an output signal of a resonant converter; a control module, which is configured to determine a target switching frequency, a target intermittent control duty cycle and a target intermittent control period of the resonant converter on the basis of the input signal, the output signal, and a target output voltage of the resonant converter, and generate a first PWM signal, a second PWM signal and a third PWM signal; and a driving module, which is configured to control the intermittent operation of a switching tube in the resonant converter on the basis of the first PWM signal, the second PWM signal and the third PWM signal, such that the output voltage of the resonant converter converges to the target output voltage. The solution of the present application can not only improve the stability of the output voltage of a resonant converter, but can also efficiently and accurately realize the efficiency optimization of the resonant converter under different load conditions.

A DCDC converter that suppresses an inrush current flowing to a capacitor is provided. A DCDC converter (1) includes: first and second capacitors (C1, C2) provided between a reference conductive path (93) and one of first and second conductive paths (91, 92); first and second cut-off switches (71, 72) interposed between a first external power supply (61) and the first capacitor (C1) and between a second external power supply (62) and the second capacitor (C2); and a control unit (12) that switches the first and second cut-off switches (71, 72) between an on state and an off state, wherein, in a case where a switch from cut-off control that maintains the first and second cut-off switches (71, 72) in the off state to energization control that maintains the first and second cut-off switches (71, 72) in the on state is performed, the control unit (12) performs intermittent control that intermittently places the first and second cut-off switches (71, 72) in the on state before the energization control.

The invention relates to the technical field of vehicle communication, in particular to an intermittent control method for an intelligent traffic unmanned vehicle communication network, and the method comprises the steps: carrying out the precise modeling of the unmanned vehicle communication network of an intelligent traffic system through employing a positive complex network model, so as to obtain a state space model, and then assuming an isolated node, and communicating with other network clusters to realize information interaction. And secondly, by designing an observer and a periodic intermittent control protocol thereof, the unmanned vehicle communication network of the intelligent traffic system can normally achieve synchronization without real-time communication, so that the stability of the unmanned vehicle communication network under various actual conditions is ensured, and the control efficiency of each unmanned vehicle is improved.

The application discloses a kind of H∞ intermittent sampling load frequency security control method of multi-area power system under deception attack belongs to the technical field of power system safety control.In the application, intermittent control signal is only used in working interval, effectively save control cost, sampling control can save limited network bandwidth, and safety control effectively resists the influence of deception attack on multi-area power system.Firstly, according to the characteristics of intermittent control and sampling control, while considering the influence of deception attack, the dynamic model of intermittent sampling load frequency security control of multi-area power system under deception attack is established.Secondly, switching Lyapunov functional is proposed, and sufficient condition for the existence of intermittent sampling load frequency security controller is given in the framework of LMI, which guarantees the exponential stability of multi-area power system and meets H∞ performance.Finally, the effectiveness of the proposed H∞ intermittent sampling load frequency security controller is verified through simulation of three-area power system under deception attack.

The invention discloses a self-adaptive complex network fixed time synchronization method based on periodic intermittent control, and relates to the technical field of complex network synchronization control, and the self-adaptive complex network synchronization method comprises the steps: building a complex dynamic network model comprising a plurality of same linear coupling nodes, and enabling the coupling strength between the nodes to change along with the time; generating a synchronous error dynamic model according to a synchronous state equation and the complex dynamic network model; according to the rule that the coupling strength changes along with time, a periodic intermittent controller with fixed time is arranged; the periodic intermittent controller acts on the complex dynamic network model, so that the error between the complex dynamic network model and the synchronous state equation within a fixed time is close to zero. According to the invention, coupling cost can be reduced, energy consumption can be reduced, and network synchronization efficiency can be improved.

The invention discloses a multifunctional small table plate for rail transit, which relates to the technical field of high-speed rail equipment and comprises a support plate, a driving motor, a threaded rod, a threaded sleeve, a main table plate, an auxiliary table plate and an intermittent control assembly. The driving motor drives the threaded sleeve to move, and the first connecting rod drives the main table plate to rotate and unfold around the connecting support. The auxiliary table board can be stored in the main table board in a sliding mode and pulled outwards when the auxiliary table board needs to be prolonged. In the drawing process of the auxiliary table plate, a linkage mechanism drives a control rod to move downwards, a triangular clamping head crosses and hooks a control pushing head to achieve automatic segmented locking, retraction caused by external force or bumping is effectively prevented, and use stability is guaranteed. And during withdrawing, the unlocking mechanism needs to be slightly pulled and triggered to enable the L-shaped connecting rod to be separated from the control groove, and then the L-shaped connecting rod can be smoothly pushed back. One-key unfolding of the main table board and flexible length adjustment and reliable self-locking of the auxiliary table board are achieved, the structure is compact, operation is safe and convenient, and the table is particularly suitable for the rail transit environment.

The utility model discloses an anastomat EMC (Electro Magnetic Compatibility) tool which comprises a clamping space for clamping an anastomat, a turntable wheel arranged on a base, a movable device arranged at the top end of the base, a power supply device arranged on the base and a motor arranged on the base, electromagnetic radiation isolation covers are mounted on the power supply device and the motor; the moving device opens or closes the anastomat, the rotating disc wheel intermittently controls the moving device, so that the anastomat is intermittently controlled to be opened and closed, and the electromagnetic radiation isolation cover can reduce emission of electromagnetic radiation; compared with the prior art, the anastomat is intermittently opened and closed, the detection process of the anastomat is completely achieved, the influence of the motor and the power supply device on overall detection is effectively reduced, and the detection precision is improved.

A fuel supply system for an aircraft according to the present invention comprises: an intermediate tank which is fluidly connected to a fuel pump and an engine via a fuel supply path; a pressure sensor which detects the internal pressure of the intermediate tank or a tank pressure that is correlated with the internal pressure of the intermediate tank; and a processing circuit which executes intermittent control for controlling a pump actuator in accordance with the tank pressure. The intermittent control includes: when the tank pressure increases and reaches a first threshold value, controlling the pump actuator to stop the fuel pump in a state where supply of a fuel to the engine from the intermediate tank is allowed; and when the tank pressure decreases and reaches a second threshold value which is lower than the first threshold value, controlling the pump actuator to drive the fuel pump.

This invention discloses a simple intermittent quantization control method for Chua's circuit systems. This method first designs an indirect signal-based estimation algorithm to estimate unknown states and disturbances in the network system. Then, two threshold functions are designed to construct an aperiodic intermittent control strategy. A uniform quantization controller quantizes the system's control inputs to reduce the transmission of redundant control signals. When applied to Chua's circuit systems, this method achieves excellent unknown state and disturbance estimation results and effectively conserves system control resources.

The control circuit has a first intermittent control mode in which the pulses of the drive signal are shortened according to the input current; a hybrid control mode in which a pulse width control mode for controlling the width of the pulses of the drive signal and an intermittent control mode for shortening the pulses of the drive signal are combined; and a second intermittent control mode in which the pulses of the drive signal are shortened according to the output voltage. When the duty cycle of the drive signal is below a predetermined threshold, the control circuit selects the second intermittent control mode. When the duty cycle of the drive signal exceeds the predetermined threshold and the input voltage is above a predetermined value, the control circuit selects the hybrid control mode. When the duty cycle of the drive signal exceeds the predetermined threshold and the input voltage is below a predetermined value, the control circuit selects the first intermittent control mode.

The rotary valve body stepping operation device comprises an outer cavity, an air outlet box is connected to the center of the lower end of the outer cavity, a rotary valve body is rotationally arranged in the center of the interior of the outer cavity, an intermittent control assembly is arranged on the air outlet box, and the rotary valve body is controlled to rotate through the intermittent control assembly; the outer cavity is further provided with a time delay relay, and the time delay relay is electrically connected with the intermittent control assembly. The invention further discloses an operation method of the rotary valve body. According to the rotary valve body stepping operation device, the problem that in the operation process of an existing rotary valve body, the overall efficiency is reduced due to the fact that a low-efficiency area exists for a long time is solved.

Intermittent control of an actuator 10 assembly e.g. a variable aperture (fig 2) or a lens 50 of a camera device to move a movable part 20 (e.g aperture blade) to a target location which may correspon

The invention belongs to the field of motor energy-saving control, and particularly relates to a fan group control method based on air volume decoupling distribution, which comprises the following steps: S1, parameter initialization and environment perception; s2, calculating a target total air volume based on a piecewise linear model of the dynamic temperature control bandwidth; s3, fan cluster total air volume integer distribution based on the energy efficiency optimal principle is executed; s4, long-period intermittent control is carried out on the remaining air volume; and S5, executing a life balance scheduling and dead zone protection mechanism based on space symmetry. Through cooperative work of parameter initialization, air volume decoupling, energy efficiency distribution and a space symmetric scheduling mechanism, low-cost, high-energy-efficiency, high-precision and uniform-airflow energy-saving regulation and control of a large-space controlled environment are achieved on the premise that frequency conversion transformation is not needed.

The invention relates to a two-stage event triggering finite time control method for a complex dynamic network, which comprises the following steps of: S1, constructing a system model, constructing a complex dynamic network CDN (Content Delivery Network) consisting of Q mutually coupled nodes, modeling each node, and setting a synchronization target of the complex dynamic network CDN; s2, an event-triggered intermittent traction pulse controller is designed, a novel time-triggered intermittent control strategy is designed, and the starting moment and the ending moment of a control window are determined with the help of a special auxiliary function by means of a two-stage event triggering mechanism; and S3, the complex dynamic network CDN carries out finite time synchronization by utilizing two-stage event trigger time control. According to the invention, a two-stage event triggering mechanism is designed for driving the start and end moments of a control window in intermittent control, and a controller is allowed to realize finite time synchronization in an intermittent operation mode.

The embodiment of the present invention discloses an aeration control method, device, electronic device and storage medium. The method includes: obtaining the current operating frequency of the aeration air unit and the current dissolved oxygen value of the target sewage to be aerated by the aeration air unit; when the current operating frequency of the aeration air unit is the lowest operating frequency and the current dissolved oxygen value is greater than the first preset dissolved oxygen threshold, controlling the aeration air unit to operate in an intermittent control mode; wherein the intermittent control mode is a mode in which the aeration air unit is controlled to alternately operate in a stop working state and a restart working state, and the restart working state is a state in which the aeration air unit operates in accordance with the lowest operating frequency. The technical solution of the embodiment of the present invention can reduce the energy consumption waste of the aeration air unit while being conducive to reducing the current dissolved oxygen value of the target sewage, thereby minimizing the occurrence of excessive aeration and achieving the effect of improving the effluent water quality of the target sewage.

The invention relates to a steam source automatic switching control method based on multi-parameter collaborative decision, and the method achieves the online precise recognition of a switching trigger condition through an automatic judgment mechanism based on multi-parameter collaborative decision, automatically judges the preheating completion state of a pipeline, and overcomes the limitations that a conventional control method depends on human experience, and is single in monitoring parameter. On the basis, a smooth valve control instruction is generated by utilizing the control targets of automatic step sequence, dynamic balance switching speed and process smoothness combined with intermittent control and cooperative adjustment, and accurate cooperative adjustment of the main steam source valve and the standby steam source valve is achieved. According to the method, on the premise that the pressure, the temperature and the water level of the deaerator are stable, the steam source switching time is remarkably shortened, parameter fluctuation in the switching process is reduced, and the flexibility and the safety of a unit to cope with start-stop peak regulation and deep peak regulation working conditions are improved.

The invention discloses a discrete agent-based load group modeling and consistency regulation and control method and system, and the method comprises the steps: building a discrete time load group model based on a load group, and enabling the discrete time load group model to comprise a leader and a plurality of followers; determining a system matrix including an adjacent matrix and a leader connection matrix; dividing the followers by using competition relationship representation; obtaining a low-gain state feedback matrix; setting the maximum response time of regulation and control; in the regulation and control process, a complete intermittent control protocol and a partial intermittent control protocol are generated; respectively calculating control tracks of followers under different control protocols and corresponding saturation constraint values; calculating a consistency error between the system states of the leader and the follower at the regulation and control time k; and judging whether the regulation process is ended or not according to the consistency error. According to the method, control paradigm innovation, heterogeneous system compatibility, time-varying demand adaptation, communication overhead optimization, stable performance guarantee and system self-evolution can be realized, and the flexibility, high efficiency and engineering practicability of power load regulation and control are remarkably improved.

The present invention discloses a control method for a remote terminal unit (RTU) for balancing and adjusting an oil pumping unit. The method comprises the following steps: S1: sensor data collection: load sensor B1 outputs a 4-20mA signal, which is connected by a wire to the analog input (AI) terminal of RTUA15 to collect load data at the well suspension point; displacement sensor B2 outputs a 4-20mA signal, which is connected by a wire to the analog input (AI) terminal of RTUA15 to collect displacement data at the well suspension point; electrical parameter sensor A14 outputs an RS485 signal, which is connected by a serial cable to the RS485 port of RTUA15 to collect relevant electrical quantity data; S2: edge computing and analysis; S3: balance calculation; and S4: local control. The present invention provides an intelligent RTU device for controlling the well suspension point based on dynamometer diagrams and electrical parameter analysis. This shortens the closed-loop control link for the well suspension point, enabling intelligent control such as local balancing, intermittent control, and variable frequency speed regulation, significantly improving system operational stability.

The present application relates to a kind of zeolite molecular sieve adsorption and desorption exhaust purification device, including adsorption mechanism, translation mechanism and impurity removal mechanism, when the clogging appears in the runner mesh in zeolite runner, utilize translation mechanism to drive multiple first adsorption disc, second adsorption disc away from each other, then the mobile assembly in impurity removal mechanism drives intermittent control component and crushing component enter to the gap between first adsorption disc and second adsorption disc, under the drive of intermittent control component, crushing component swings back and forth to utilize brush to crush the clogging in runner mesh, then again utilize absorption component to absorb clogging, to realize the function of cleaning zeolite runner, on the one hand, the clogging in the runner mesh in existing runner can appear, to affect the problem of normal use of zeolite runner, on the other hand, a whole zeolite adsorption disc is separated into multiple independent adsorption disc, can guarantee the cleaning effect of zeolite runner.

The present application belongs to the field of motor energy-saving control, and specifically refers to a fan group control method based on air volume decoupling distribution, comprising the following steps: S1 parameter initialization and environment perception; S2 segmented linear model calculation of target total air volume based on dynamic temperature control bandwidth; S3 execution of fan cluster total air volume integer distribution based on energy efficiency optimization principle; S4 long-period intermittent control for residual air volume; and S5 execution of life balance scheduling and dead zone protection mechanism based on spatial symmetry. Through the cooperative work of parameter initialization, air volume decoupling, energy efficiency distribution and spatial symmetry scheduling mechanism, the present application realizes low-cost, high-energy efficiency, high-precision and airflow uniformity energy-saving regulation and control of large-space controlled environment without the need of frequency conversion modification.

The present invention discloses an air supply and return structure for a bus air conditioner, an air conditioning system, and a control method thereof, belonging to the technical field of air conditioning equipment. The present invention adopts a technical solution in which the air supply and return structure includes an air supply duct, a return air duct, a return air box, a return air chamber, an air valve group, and a connecting air duct. The air conditioning system and control method employing the air supply and return structure utilize periodic intermittent control of multiple air valve groups to regularly switch the supply and return air vents in operation, allowing the delivered cold air flow to cool more of the middle and lower interior space where passengers are located. Furthermore, different airflow organization modes can be formed to meet different actual needs, achieving more reasonable airflow organization and cooling capacity distribution.

The invention discloses a rotating aircraft strapdown image tracking navigation method and device and a storage medium, and the method comprises the steps: building an aircraft nonlinear dynamic model through delay calculation, optics and detector angle measurement, carrying out sampling holding and angular motion to extract sight angle output, and carrying out intermittent control to obtain a strapdown image through an intermittent control method; the aircraft is kept flying at a constant angle of attack over a period of time. A rotating aircraft nonlinear kinetic model is constructed based on a full attack angle equation, aircraft attitude angle and sight angle information is decoupled, the full attack angle and aircraft orbit simulation precision is improved, and finally the aircraft guiding method is determined.