12 results about "Multi loop control" patented technology

The invention provides a steam pipe network energy consumption intelligent monitoring and optimization control method and system, and belongs to the technical field of industrial automation and energy management, and the method comprises the steps: obtaining the multi-dimensional perception data of a steam pipe network, extracting the multi-dimensional feature vector representing the operation state from the multi-dimensional perception data, and constructing a multi-dimensional feature matrix, the initial running state of the steam supply system is obtained; on the basis of the multi-dimensional feature matrix, the coupling relation between the loops of the steam pipe network is recognized in real time, a coupling coefficient matrix is constructed and dynamically updated, and a control optimization strategy of the steam supply system is generated in combination with the initial operation state and the coupling coefficient matrix; controlling the steam supply system to design a feedforward decoupling compensator according to a control optimization strategy and a coupling coefficient matrix updated in real time, and constructing a hierarchical control architecture; and realizing adaptive adjustment and coordinated optimization of the target control loop according to the parameters of the multi-loop controller. According to the invention, self-adaptive closed-loop control in the steam pipe network is realized.

The invention provides a dynamic adjustment method and system for traditional Chinese medicine cooking temperature. The method comprises the following steps: collecting the temperature of each subarea of a medicine decocting pot and a steam inlet pressure parameter in real time, generating a temperature distribution deviation parameter through area weighting processing, and dynamically coupling the temperature distribution deviation parameter with steam pressure to form a composite parameter reflecting the heat exchange efficiency; a multi-loop control strategy is adopted, the opening degree of a steam valve set of the corresponding partition is dynamically adjusted based on the composite parameters, and the valve priority is set according to the space position of the partition; a pressure fluctuation compensation mechanism is innovatively introduced, physical boundary constraint processing is carried out on opening parameters through an iterative algorithm, and finally the temperature distribution imbalance degree of each partition is converged to a preset threshold value; and a closed-loop adjusting system is formed through a valve cooperative control and dynamic compensation algorithm. According to the technical scheme provided by the invention, rapid and balanced control of partition temperatures of the medicine decocting pot is realized, and the thermal consistency and the medicinal component extraction stability in the traditional Chinese medicine cooking process are effectively improved.

The invention discloses a multi-loop control circuit and a control method thereof. The multi-loop control circuit comprises an amplification stage circuit and a current selection circuit. Wherein the amplification stage circuit is provided with a first transduction amplifier capable of outputting a first transduction amplification current and a second transduction amplifier capable of outputting a second transduction amplification current. The current selection circuit receives the first transduction amplification current and the second transduction amplification current and outputs an error output current. The current selection circuit selects the maximum one from the first transduction amplification current and the second transduction amplification current and outputs the maximum one as an error output current, and the error output current generates an error amplification signal.

The invention belongs to the technical field of boiler steel ball mill powder milling control, and particularly relates to a steel ball mill powder milling self-adaptive control system and a control method. A multivariable self-adaptive control method is adopted, and a mill inlet hot air door, a powder exhauster recirculation air door and a mill coal feeder rotating speed are used as regulating variables; decoupling control is conducted on the mill outlet temperature, the mill inlet negative pressure and the mill inlet and outlet differential pressure; and estimating control characteristic model parameters of the steel ball milling system by using a radial basis function neural network and historical data, and performing decoupling compensation control on a characteristic vector space of an input quantity sensitivity matrix based on a controlled quantity of a controlled object. According to the invention, decoupling control of the coal mill outlet temperature, the coal mill inlet negative pressure and the coal mill inlet and outlet differential pressure of the steel ball mill pulverizing system is realized; the problem of multivariable coupling existing in a conventional independent multi-loop control mode can be effectively solved, and long-term stable operation of automatic control of the coal pulverizing system is achieved.

The application discloses a wind heat environment simulation device and a control method thereof. The method is characterized in that a heating array composed of a flexible electric heating film and a one-to-one corresponding temperature sensor array are arranged on the surface of a heated object, and a wind speed sensor is arranged. A controller calculates the basic heating power of each heating unit according to a preset wind speed-power mapping relationship and a real-time wind speed value. Meanwhile, the power of each heating unit is independently closed-loop corrected according to the deviation between the actual temperature and the target temperature fed back by each point temperature sensor. After the feedforward value and the feedback correction value are superimposed, each heating unit is driven by a multi-loop PWM controller. The application realizes the instant response of the heating array to the change of the wind speed and the accurate control of the non-uniform temperature field on the surface, has the advantages of small thermal inertia, high control precision, low system complexity and easy expansion, and provides a reliable experimental platform for the research on the urban wind heat environment.

This application provides a method and system for dynamically adjusting the temperature of traditional Chinese medicine (TCM) decoction. The method involves real-time acquisition of temperature and steam inlet pressure parameters for each zone of the decoction pot, followed by regional weighting to generate temperature distribution deviation parameters. These parameters are then dynamically coupled with the steam pressure to form a composite parameter reflecting heat exchange efficiency. A multi-loop control strategy is employed to dynamically adjust the opening degree of the steam valve groups in the corresponding zones based on these composite parameters, with valve priority set according to the spatial location of each zone. An innovative pressure fluctuation compensation mechanism is introduced, using an iterative algorithm to apply physical boundary constraints to the opening parameters, ultimately converging the temperature distribution unevenness of each zone to a preset threshold. A closed-loop control system is formed through valve collaborative control and a dynamic compensation algorithm. The technical solution provided in this application achieves rapid and balanced temperature control of the decoction pot zones, effectively improving the thermal consistency and extraction stability of medicinal components during the TCM decoction process.

The application discloses an integrated control module, an IO interface circuit and a controller, wherein the integrated control module is configured to build a closed-loop control system in an analog domain, convert an electrical signal input by an IO interface into an analog input waveform by using a waveform encoder, synthesize the analog input waveform into a periodic time-division multiplexing analog input signal wave by using an input waveform multiplexer driven by a time sequence controller, generate an isomorphic analog setting signal wave by setting a waveform generator, directly analog subtract two waveforms by using a differential amplifier to obtain an analog differential signal wave, separate the analog differential signal wave into independent pulse error signals of each channel by using a synchronous demodulation and distribution unit in combination with a sample and hold circuit, and finally generate a driving signal by an analog PID controller. The application solves the problems of the synchronism and the integration of multi-loop control by using a unique analog domain time-division multiplexing and demodulation architecture, and provides a new hardware solution for high-performance real-time control.

The invention relates to the technical field of anti-swing control of bridge cranes, in particular to a double-swing bridge crane integrated control method and system which comprises an equation calculation unit, a shaping design unit, a target setting unit, a convolution operation unit, an integral operation unit, an error calculation unit and a control calculation unit. By arranging a double-pendulum bridge crane system mathematical model with a double-pendulum effect and introducing an input shaper, the swing suppression and anti-interference performance of the system disclosed by the invention is improved based on the control of the control system on the double-pendulum bridge crane, and by arranging the multi-loop control system and the nonlinear PID integrated control system, the system has the advantages of high reliability and high reliability. Through the synergistic effect of input shaping and the controller, the vibration frequency characteristic and full-state real-time information of the double-pendulum bridge type crane system are fully considered, so that the double-pendulum bridge type crane system has good response speed and stability, the residual swing of the double-pendulum bridge type crane system is reduced, and the service life of the double-pendulum bridge type crane system is prolonged. And the engineering transportation efficiency of the double-pendulum bridge crane system is improved.

The application discloses a single-satellite high-precision cooperative remote sensing method, which is applied to a satellite platform with multiple loads, and payloads are connected with the satellite platform through flexible cables, contactless actuators and the satellite platform to form a multi-loop control system; the method comprises the following steps: (1) equivalent the flexible cable to a combination of multiple beads, springs and dampers; (2) establishing force equations and moment equations of all payloads, all flexible cables and the satellite platform; establishing control equations and constraint conditions of the multi-loop control system; (3) according to the control equations and constraint conditions of the multi-loop control system, the payloads are oriented, multiple payloads are directed to the same target, and the distance between the payloads and the satellite platform is controlled within a critical distance. Through the contactless actuators, the flexible cable dynamics modeling and the establishment of the control equations of the multi-loop control system, the super-static super-stable and cooperative work of multiple payloads on a single satellite platform are realized.

The invention discloses a construction site lighting intelligent energy-saving system and a control method, and belongs to the technical field of building engineering construction energy saving. The system comprises a multi-source sensing module, a lighting execution module, a core intelligent control module, a communication module and a remote management platform. The system fuses personnel activities, construction features and environment illumination data through a multi-source sensing module; the core intelligent control module calls a multi-source data fusion logic and an adaptive algorithm to generate a lighting control instruction based on the current working state of the system determined by the construction plan, the time period and the sensing data; the lighting execution module executes instructions through dynamic partition and multi-loop control. According to the method, the authenticity of personnel activities is verified through multi-source data fusion, the adaptive construction progress is divided by using a dynamic function, and precise on-demand illumination is realized by combining a scene mode and adaptive dimming, so that the defects of high energy consumption, poor adaptability and low operation and maintenance efficiency of traditional illumination are overcome, and the illumination energy consumption and the operation and maintenance cost of a construction site are remarkably reduced.

The present invention discloses a design and verification method for a distributed control system platform for the mode switching process of a variable-cycle engine. First, a multi-loop PI controller with limited protection is designed, and a multi-loop PI control algorithm for mode switching is developed. Second, a distributed control simulation and verification platform for the variable-cycle engine is designed, and a platform of intelligent simulation nodes is built according to the principle of minimization. Then, a communication scheduling table for the distributed control simulation platform of the multi-loop PI is designed, and communication functions between multiple intelligent nodes are developed. Finally, the engine model and control algorithm are transplanted and deployed to the distributed control simulation platform, and the quality of the control system in an environment containing random noise is verified. The present invention provides a feasible control scheme for the transient state control of the variable-cycle engine, including mode switching, and designs a distributed controller with multiple adjustable parameters for the variable-cycle engine and its simulation platform. Simulation results show that the designed multivariable controller has good robustness to noise under the distributed architecture.

A multi-loop control method and system for controlling a temperature of a device under test (DUT) is disclosed. An expansion valve flow controller receives three error inputs including a DUT temperature error, a heater power error, and a superheat error. The expansion valve flow controller includes a DUT temperature sub-controller configured to provide rapid response to instantaneous DUT heat load changes, a heater power sub-controller configured to provide slower adjustment for accumulated heater power error, and a superheat limiting sub-controller configured to prevent excessive refrigerant flow. Outputs of the sub-controllers are combined to generate an expansion valve flow percentage, which is constrained by a minimum threshold to maintain stable valve operation. The resulting expansion valve flow control signal is applied to a variable flow expansion valve of a refrigeration subsystem to maintain DUT temperature under rapidly changing heat load conditions.