352 results about "Fuzzy pid control" patented technology

The invention discloses a control method for motion stability and outline machining precision of a multi-shaft linkage numerical control system. The control method achieves control on the motion stability and outline machining errors of the multi-shaft linkage numerical control system by using a compound control mode of multi-shaft parameter module predictive control and non-linear self-adaptive fuzzy proportional-integral-derivative (PID) control. Simultaneously, error module calculating efficiency is improved by building an outline error module, a speed error module and an acceleration error module. By means of performance optimization indexes, tracking errors, outline errors, speed errors and acceleration errors of the system are minimum, and control performance of a multi-shaft servo control system is improved. Multi-shaft parameter module predicative control increment is solved through a simplified calculating module so as to meet real-time requirements of the control system. Robust property of the multi-shaft linkage numerical control system is improved by adopting the non-linear self-adaptive fuzzy PID control method. The control method effectively improves the motion stability and outline machining precision of the multi-shaft linkage numerical control system.

The invention provides a digital switch converter with fast transient response capability. The digital switch converter comprises a Buck type switch converter power level main topology structure, an A/D (analog-to-digital) sampling conversion unit, a prediction control unit, a fuzzy PID (proportion integration differentiation) control unit, a DPWM (digital pulse width modulation) unit and a driving unit, wherein the A/D sampling conversion unit respectively samples the analog output voltage value and the analog inductor current value of the sampling switch converter and converts analog signals into digital signals, the prediction control unit predicts the next switch period output voltage value according to the A/D sampling digital signal value combined with the Buck type switch converter main topology structure, the fuzzy PID control unit determines the switch period duty ratio according to the output voltage error value and the output voltage error deviation value, and the DPWM unit and the driving unit output the corresponding on-off state of a power tube of the PWM driving switch converter according to the duty ratio for regulating the output voltage value.

Disclosed is a diesel engine variable-altitude boost pressure control method. Through a two-level adjustable booster controller ECU, according to change of altitude, diesel engine rotation speed and loads, opening of a high-pressure stage VGT vane of a two-level adjustable booster and opening of a high-pressure stage turbine regulating valve and a low-pressure stage turbine regulating valve are controlled in real time, optimal control is conducted on boost pressure in a variable-altitude and variable-working-condition mode, and the purpose that in the 0 m-5500 m altitude range, all performance indicators of a diesel engine are always kept the same as the performance under the plain conditions is achieved. The mode that feedforward control and fuzzy PID control are combined is adopted for the diesel engine variable-altitude boost pressure control method, and the boost pressure can be adjusted in real time according to change of altitude and working conditions of the diesel engine, so that the requirements for best power performance and fuel economy in the steady state working condition and the transient state working condition are met, the objective that power of the diesel engine at the altitude 5500 m fixed point is recovered to 95% or above that on plains is achieved, turbo lag is relieved, and pumping loss work is reduced. Meanwhile, the problems of gas compressor surges, turbine overspeed, excessively high turbine-front discharge temperature and the like are avoided.

The invention discloses a hoisting load anti-swing control device, method, system and engineering machinery. The hoisting load is hoisted by a cantilever crane through a lifting rope. The hoisting load anti-swing control device comprises a receiving device and a control device, wherein the receiving device is used for receiving the horizontal position of the top end of the cantilever crane and/or receiving the tilt angel of the hoisting load and the rate of the tilt angle; the control device is used for carrying out one of the followings: when the horizontal position of the top end changes, controlling an anti-swing device to compensate the horizontal displacement of part of the lifting rope so as to enable the horizontal position not to change before the horizontal position of the top end of the cantilever crane changes; when the tilt angle and rate of the tilt angle of the hoisting load are greater than the preset values, adopting fuzzy PID control algorithms to enable the anti-swing device to control the horizontal displacement of part of the lifting rope so as to restrain the tilt angle and the rate of the tilt angle. Through the adoption of the technical scheme, various interferences can be counteracted, greater swing can be restrained, and higher positioning precision can be reached.

The invention discloses a central air conditioning fuzzy PID control system based on load prediction control. The system comprises a load prediction module, a fuzzy PID control module, an executor, acontrolled object and a sensor. The load prediction module is composed of three load prediction units including the medium-term load prediction unit, the short-term load prediction unit and the flow prediction unit. A load prediction controller calculates the required chilled water flow of a current chilled water system according to history operating data and an outdoor temperature, then the required frequency of a chilled water pump is calculated by means of the intelligent fuzzy PID control system, finally, the rotating speed of the water pump is changed through a water pump frequency changer, variable flow control of central air conditioning chilled water is completed, and therefore, the system has the energy-saving benefit. By means of the refrigeration house temperature feedforward-fuzzy control system based on dynamic load variation and the control method, the phenomena that temperature control through a traditional central air conditioning system chilled water control scheme lags, and the control precision is not high are avoided, early response of a flow control system is achieved, and the performance of a central air conditioning system is guaranteed.

The invention relates to a novel air-conditioning control technique with variable air quantity based on enthalpy value control, which comprises a pressure relevant type end device control part and a fuzzy PID control part. The technique concretely comprises a PID controller, a parameter self-calibration module, a fuzzy database, an air return valve, an air delivery valve, an air-conditioning end with variable air quantity, a humiture sensor and an air enthalpy value operation module. The humiture sensor collects indoor humiture signals Tr and phi r, the indoor humiture signals are transformedinto an executable standard electric signal by a variable delivery link, the electric signal is delivered into the air enthalpy value operation module, an enthalpy value representing indoor humiture properties is obtained by calculation, and the enthalpy value is compared with a set enthalpy value. After comparison, a bias and a bias change rate are regulated and calibrated by the fuzzy control module, and a timely and accurate control signal is sent to the air delivery valve or the air return valve positioned at the end, thereby changing the air quantity so as to achieve the purpose of regulating the humiture in a room. The invention has intellectualized control and shorter response regulation time and realizes the purpose of energy saving of an air-conditioning host machine.

The invention discloses a method for controlling a PID controller route based on fuzzy control. The method comprises the steps that on the basis of a motor PID controller, a route correcting strategy based on the fuzzy control idea is integrated, fuzzy PID controlled quantities of delta Kp, delta Ki and delta Kd are obtained by detecting deviation and the deviation regulating rate, after the fuzzy PID controlled quantities are received by the PID controller, the fuzzy PID controlled quantities are subjected to defuzzification to be adjusted to be three precise controlled quantities of Kp, Ki and Kd. Accordingly, a motor of self-tracking equipment is controlled, and the purpose of correcting the route is achieved.

The invention discloses an intelligent road tour inspection control method for a multi-rotor-wing unmanned aerial vehicle. The method includes the steps of: 1. an airborne holder image sensor is controlled through a holder control unit, and the image sensor is vertically downward, and obtains information of an image right under an unmanned aerial vehicle; 2. road surface image information is obtained through the image sensor carried by the unmanned aerial vehicle, and a road central line is obtained through image processing and extraction; and 3. a deviation value of the road central line obtained by extraction and the actual position of the unmanned aerial vehicle is utilized to perform flight control of the unmanned aerial vehicle. At the same time, to reduce coupling of control, after control bottom layer driving is designed, only pitching and yaw control of the unmanned aerial vehicle is performed. For pitching control, constant-speed flight is adopted; and for yaw control, dual-mode parameter self-correcting fuzzy PID control is adopted. The intelligent road tour inspection control method applies the unmanned aerial vehicle to perform road tour inspection, and can reduce to a great extent cost of road tour inspection which is performed by applying a patrol vehicle at present, the visual field range of tour inspection is wide, and the control method is not limited by the road traffic condition.

The invention discloses a head real-time control system and method for a small unmanned aerial vehicle for a land survey. The head real-time control system comprises a head three-axis drive system, a video camera, an MEMS sensor, a processor and a core controller; the core controller controls the head three-axis drive system to conduct adjustment according to the angle, needing to be adjusted, of the head three-axis device system, wherein the angle is obtained through the processor. According to the head real-time control system and method for the small unmanned aerial vehicle for the land survey, the unmanned aerial vehicle for aerial surveying can meet ideal precision requirements in flight attitude control and head stability control; particularly, a unique online image angle calculation method is added, a head is controlled really according to actually photographed image features, and the unmanned aerial vehicle can adapt to various complex environments; meanwhile, fuzzy PID control is combined with self-adaptive Kalman filter, a stable image can be obtained, and therefore the difficulty of post processing of the image is reduced.

The invention discloses a test system for electro-hydraulic servo online self-adjusting fuzzy PID control and an online self-adjusting fuzzy PID control method for an electro-hydraulic servo position system. The test system for the electro-hydraulic servo online self-adjusting fuzzy PID control comprises an industrial personal computer, a data processing system, an electro-hydraulic servo control system, an online self-adjusting fuzzy PID controller, a processing circuit and a sensor. Different sensor signals in the sensor pass through the processing circuit, digital signals are gathered, and the online self-adjusting fuzzy PID control is performed through an electro-hydraulic servo system to realize the test control for the electro-hydraulic servo system. The test system for the electro-hydraulic servo online self-adjusting fuzzy PID control is featured with high test efficiency, good stability, strong practicability and the like, realizes the online real-time regulation for PID parameters and has strong identification performance and robustness for the online system parameter self-adjusting, and accordingly the system test precision and stability are improved, and the economical benefit and social benefit are good.

The invention provides a brushless DC motor fuzzy PID control speed regulation system and method. The method comprises steps of according to the fuzzy control theory, establishing a fuzzy PID controller module of a brushless DC motor speed regulation system; establishing a brushless DC motor speed regulation system module; establishing the objective function of fuzzy PID controller parameter optimization of the brushless DC motor speed regulation system; and obtaining the fuzzy relation between the fuzzy PID controller Kp, Ki, Kd and the error e and the error rate of change ec, and according to the values of the error e and the error rate of change ec, and fuzzy control rules, modifying the three parameters Kp, Ki, Kd. The invention also correspondingly provides a fuzzy control device. The method of the invention adopts the fuzzy PID control for the speed regulation in the PID control system, and has the advantages of good dynamic performance, fast rising speed, small overshoot and good robustness.

The present invention discloses a furnace cooling intensity control method based on vague PID control, and belongs to the technical field of furnace cooling control. The control method is based on the heat transfer theory and the engineering thermodynamics. A novel furnace water supply cooling method is provided; a diverging three-way valve serves as an executing mechanism; advantages of conventional PID control and vague control are combined; according to nonlinearity, obsoleteness and possible uncertain factors of a furnace cooling intensity control method and operating characteristics of a furnace closed-loop soft water circulating cooling system, PID parameter self-tuning inference rules are established, and opening of the diverging three-way valve is adjusted, thereby controlling cooling wall cooling intensity; in comparison with those in the prior art, real-time control of the cooling intensity is realized, control accuracy and stability are also raised, and manpower consumption is reduced.

The invention relates to an airborne evaporation cycle refrigeration comprehensive heat management system and a method and application thereof and belongs to the airborne equipment cooling field. The airborne evaporation cycle refrigeration comprehensive heat management system comprises a high heat flow heating element spraying cooling cycle sub-system and an evaporation refrigeration cycle sub-system; and the airborne evaporation cycle refrigeration comprehensive heat management system further comprises a phase change heat exchanger (7) connected with the high heat flow heating element spraying cooling cycle sub-system and the evaporation refrigeration cycle sub-system, and a fuzzy PID control system (10). According to the system, by means of the fuzzy PID control system, the influences of heat inertia are considered, and the cold energy is fully utilized to perform cold storage for a phase change material; and by means of frequency conversion of a compressor, the purpose that one evaporation cycle refrigeration system is used to provide the cold energy for a refrigeration space and an airborne high heat flow heating element at the same is achieved, the system is integrated, the cold energy of the evaporation cycle refrigeration system is comprehensively managed, the heat load of the refrigeration space and the heat load of the airborne high heat flow element are reasonably matched, the weight of the system is greatly reduced, and the airborne equipment requirement is met.

The invention belongs to the technical field of computerized flat knitting machines, in particular to a method for controlling operations of a shaker of a computerized flat knitting machine. The method comprises the following steps: collecting real-time operation information of a servo motor; inputting the obtained operation information of the servo motor into an information processor to calculate; calculating an offset value in the step (2) by adopting an adaptive fuzzy PID control algorithm so as to obtain current revised data and then inputting the revised data into a program controller; calculating current Kp, Ki and Kd values by utilizing a fuzzy self-tuning rule and carrying out discretization processing through an incremental PID calculation; and outputting control signals to the servo motor by the program controller according to a control program to realize the automatic operation error correction and the precise operation control of the shaker. The invention can avoid needle transferring and connecting deviations and ensure that the computerized flat knitting machine works in an optimal state all the time, thereby solving the problem of unstable precision of the shaker inan operation process of the computerized flat knitting machine.

The invention discloses an improved particle swarm optimization fuzzy PID fuel cell temperature control method. The method comprises the following steps: establishing a fuel cell dynamic model based on an MATLAB/Simulink simulation platform, and obtaining output power and corresponding temperature of a fuel cell through the fuel cell dynamic model; designing a fuzzy PID temperature controller forthe fuel cell dynamic model, and controlling an error and an error change rate of an expected temperature value and an actual temperature value by using the controller to obtain a parameter adjustmentamount of the fuzzy PID temperature controller; optimizing a quantization factor and a scaling factor in the fuzzy PID temperature controller by adopting an improved particle swarm algorithm; and assigning the optimized quantization factor and scaling factor to a fuzzy PID temperature controller so as to control the temperature of the fuel cell in real time. According to the method, improved particle swarm optimization fuzzy PID control is utilized, a control strategy is set according to a control experience rule, the method has the advantages of being high in robustness, high in response speed and the like, and it is ensured that the PEMFC stack is maintained at a fixed temperature.

The invention discloses a ship course controller based on a fuzzy PID algorithm. The controller includes: an input unit for obtaining an ideal rudder angle deflection according to the rudder deflection angle required by the ship and the output of a stepping motor drive unit; The digital conversion unit is used for digital-to-analog conversion and analog-to-digital conversion; the fuzzy parameter correction unit is used to perform fuzzy parameter correction according to the output of the stepper motor drive unit and the ideal rudder angle deflection; the PID adjustment unit is used to correct the fuzzy parameter according to the fuzzy parameter correction unit and The output of the stepper motor drive unit is adjusted by PID; the PWM signal output unit is used to output the PWM waveform for controlling the work of the stepper motor according to the output of the PID adjustment unit; the stepper motor drive unit is used to drive the stepper motor to control the course of the ship , and feed back the position, speed and rudder angle of the ship in real time. The invention aims at adopting the fuzzy PID control algorithm to realize the self-adaptive control of the ship steering gear.

The invention relates to a hydraulic agricultural machine automatic steering control device which is characterized in that a controller and a hydraulic drive module which are connected are included. A control method comprises the following steps that the controller receives a start command of an upper computer to control an electromagnetic switch valve in the hydraulic drive module to be closed to enable an agricultural machine to switch to an automatic steering mode; the controller carries out self-adaptation fuzzy PID control according to an angle set value in a steering angle set command, a steering angle measuring angle from a sensor and an agricultural machine speed measuring value; obtained controlled quantity of the flow direction and flow is output to a proportional reversing valve of the hydraulic drive module to achieve automatic steering control. According to the hydraulic agricultural machine automatic steering control method with the self-adaptation fuzzy PID control method as a core, the problems of dead zones, equilibration and errors caused by asymmetric characters of a vehicle hydraulic steering system can be well solved, and automatic steering control precision is improved.

The invention provides a direct current speed control mothed based on fuzzy PID control, comprises the following steps: first, an actual rotation rate of the motor n and a rotation rate deviation e of a preset speed nref and a change rate of deviation ec are figured out, and then are fuzzified; after fuzzy, e and ec are controlled by fuzzy control rules reasoning, kp, ki and kd are acquired through fuzzification resolution. In the control process, a conventional PID controller parameter is modified online real-timely and finally rotation rate of the brushless direct current motor is adjusted by the traditional PID controller. The fuzzy control of the invention does not need to rely on the precise mathematical model of a controlled object so the invention is more stable in the control, and the non-linearity of the controlled object can be effectively suppressed; In the control process, the changes and real-time feedback of the parameter can be continuously monitored by the fuzzy PID self-tuning to idealize the control effect.

The invention discloses an electric power steering system and a control method. The electric power steering system comprises a collector, a processor, a fuzzy PID controller and a motor, wherein the collector is used for collecting manual torque applied to a steering wheel and the current speed of the vehicle; the processor is connected with the collector for receiving the manual torque and the speed, acquiring expected target steering torque applying to the steering mechanism after the motor is power-on according to the manual torque, the speed and the preset steering control strategy, and further acquiring target current needed when the motor outputs the target steering torque; the fuzzy PID controller is connected with the output end of the processor for receiving the target current and the present current of the motor, adopting fuzzy PID control algorithm to adjust the output current of the fuzzy PID controller according to the target current and the present current of the motor until the present current is the same as the target current; and the motor is used for controlling the steering mechanism according to the output current of the fuzzy PID controller. Accuracy and stability of the electric power steering system are enhanced.

The invention relates to a water supply control method of a hot continuous rolling line ultra fast cooling system and belongs to the technical field of hot-rolled strip steel rolling. The water supply control method includes the following steps that: step one: the opening degree of a hydraulic coupler, namely, the flow curve of a pump station, is calibrated; step two: whether a strip steel head portion achieves a speed rise point is judged, if the strip steel head portion achieves the speed rise point, a rolling line transmits set pressure and total flow to the pump station, and step three is executed, otherwise, the step two is executed; step three: whether the set pressure and the set total flow which are transmitted to the pump station by the rolling line satisfy a set range is judged, if the set pressure and the set total flow satisfy the set range, an ultra fast cooling header is opened, and flow open-loop control and speed increase are performed on the pump station, and step four is executed, otherwise, alarming is performed; step four: whether the process of the speed increase is completed or not is judged, if the process of the speed increase is completed, a fuzzy PID control method is adopted to perform rolling line pressure dynamic regulation, otherwise, the step four is executed; and step five: whether a strip steel tail portion leaves an ultra fast cooling area is judged, if the strip steel tail portion leaves the ultra fast cooling area, the flow open-loop control is disconnected, the speed of the pump station is decreased to base speed, and a rolling line pressure dynamic regulation closed loop is disconnected, otherwise, the step five is executed.

The invention discloses an algorithm for positioning control of an automatic guided vehicle (AGV) robot based on fuzzy proportion integration differentiation (PID). The algorithm comprises the following steps: a step S1 of operating environment presetting; a step S2 of establishment of an environmental map; a step S3 of AGV robot positioning; a step S4 of AGV robot line operation; and a step S5 of AGV robot operation line correction. The algorithm is more suitable for control over the AGV robot; through a mode of adding the fuzzy PID control, the response speed and control operation accuracy of the AGV robot can be improved, and the AGV robot positioning accuracy is higher.