30 results about "Bang–bang control" patented technology

The invention relates to a variable-frequency speed adjustment technique-based Bang-Bang+PID (Piping and Instrument Diagram) constant pressure water supply closed-loop control method, belonging to the technical field of constant pressure water supply control in industrial production. According to the method, a Bang-Bang controller and an error judger are added into a constant pressure water supply closed-loop control system; a controller is judged and selected by sampling a pressure set value and an actual pressure value and by calculating the errors; the output frequency of a frequency changer is adjusted and the rotation speed of a water pump motor is changed through the output of a PID controller or the Bang-Bang controller, so that the constant pressure control to the pressure of the outlet of a water supply pipe net is finally realized. According to the method, the high precision and the high stability of the PID control are combined with the rapidness and the small overshoot of the Bang-Bang control, only one operator is needed to input data in an HMI (Human-Machine Interface) in the whole operation process, the PLC (Programmable Logic Controller) then can automatically select a PID or Bang-Bang control policy according to pressure deviation, therefore, the control precision of the system is ensured, and at the same time the adjusting time of the system is greatly shortened.

The invention discloses a raw material grinding automatic control method. In an automatic state, During amplitude control of a lifting and falling roller, an amplitude scope is tested mainly through observation and lifting and falling operation of a grinding roller is carried out. During control of water pump opening, operation conditions of a material layer thickness and a mill output temperature are integrated, a pid fuzzy control operation method is employed, and the water pump opening value is adjusted to achieve stabilization control effects. During the feed control link, feed quantity is controlled according to a current of a milling machine and a current of a powder selection machine and furthermore the current and the amplitude of the milling machine are stabilized. The problem that parameter adjustment cannot be tracked rapidly in a routine PID is avoided, according to characteristics that fuzzy control is independent from an accurate mathematic model and suitable for non-linear and large time delay production processes, by utilization of fuzzy PID and Bang-Bang control methods, a tracking error convergence speed is quickened, thus the vertical milling control process has a stable dynamic performance, milling machine vibration is reduced, the yield is raised and accurate and rapid control effects are achieved.

The invention provides a cement combined-grinding prediction control method based on Bang-Bang control. The Bang-Bang control process is employed for mixing operation experiences such as observation, waiting, determination and adjusting of an operator into a control algorithm, the tracking error convergence rate is accelerated, and the system overshoot is reduced, and thus the combined-grinding system production process has good stability and the precise rapid control purpose is reached. Aiming at cement mill load control, LPV (Linear Parameter-Varying) prediction control is applied to solve control problems of variation and nondeterminacy of parameters of a linear time-varying system, and enable the system to have good robustness.

A self-regulating gas generator that, in response to gas demand, supplies and automatically adjusts the amount of gas (e.g., hydrogen or oxygen) catalytically generated in a chemical supply chamber from an appropriate chemical supply, such as a chemical solution, gas dissolved in liquid, or mixture. In some embodiments, the gas generator may employ a piston, rotating rod, or other element(s) to expose the chemical supply to the catalyst in controlled amounts. In another embodiment, the self-regulating gas generator uses bang-bang control, with the element(s) exposing a catalyst, contained within the chemical supply chamber, to the chemical supply in ON and OFF states according to a self-adjusting duty cycle, thereby generating and outputting the gas in an orientation-independent manner. The gas generator may be used to provide gas for various gas consuming devices, such as a fuel cell, torch, or oxygen respiratory devices.

The invention discloses a rapid on-line planning method for a soft landing optimal trajectory of a small celestial body, and belongs to the technical field of deep space exploration. The implementation method comprises the following steps: determining an optimal trace control form of small celestial body fuel consumption as a bank-bank control form, determining the switching times of controlling athrust amplitude bank-bank form, and determining a switching sequence of the bank-bank form for controlling the thrust amplitude on the basis of the switching times. Therefore, the optimal path planning problem of small celestial body fuel consumption is converted into the online search problem of the bang-bang control switching moment. Through a numerical prediction-correction strategy, on-linesearch is carried out on switching time, a two-variable search problem is converted into a sequence single-variable search problem of an inner loop and an outer loop, on-line generation of a small celestial body soft landing fuel consumption optimal trajectory is achieved, and rapidity and convergence of the landing trajectory planning method are guaranteed.

The invention discloses a genetic algorithm optimized fuzzy PID flow control method in a variable-rate spraying system and belongs to the technical field of automatic control. The method includes the following steps that: actual crop pest and disease damage information is collected, such that required actual drug dosage can be determined; deviation between set flow and actual flow is calculated; flow deviation and the change rate of the deviation are calculated; and optimization is performed on a fuzzy controller is through using a genetic algorithm, wherein the optimization includes the steps of determining the optimized algebra, crossover rate, mutation rate and fitness function of the computation of the genetic algorithm, and optimizing the fuzzy controller according to system index requirements; errors and the change rate of the errors are inputted to the fuzzy PID controller optimized by the genetic algorithm, and output after the computation is adopted as control quantity of the variable-rate spraying system; and when the system has large errors, bang-bang control is adopted, and when the system has small errors, optimized fuzzy PID control is adopted. With the genetic algorithm optimized fuzzy PID flow control method of the invention adopted, a precise control method can be provided for a precise agriculture drug application system, and agricultural agents can be effectively saved.

A self-regulating gas generator that, in response to gas demand, supplies and automatically adjusts the amount of gas (e.g., hydrogen or oxygen) catalytically generated in a chemical supply chamber from an appropriate chemical supply, such as a chemical solution, gas dissolved in liquid, or mixture. In some embodiments, the gas generator may employ a piston, rotating rod, or other element(s) to expose the chemical supply to the catalyst in controlled amounts. In another embodiment, the self-regulating gas generator uses bang-bang control, with the element(s) exposing a catalyst, contained within the chemical supply chamber, to the chemical supply in ON and OFF states according to a self-adjusting duty cycle, thereby generating and outputting the gas in an orientation-independent manner. The gas generator may be used to provide gas for various gas consuming devices, such as a fuel cell, torch, or oxygen respiratory devices.

The present invention discloses a dual-mode controller of an electrical-mechanical converter. The dual-mode controller of the electrical-mechanical converter comprises a control chip, a digital analog converter (DAC), a hysteresis comparison PWM modulator, a current signal conditioning circuit, a difference orthogonal signal conditioning circuit, a signal switching switch, an H-bridge driving module, a protection circuit, the electrical-mechanical converter, a temperature sensor, a current sensor and a digital grating scale. An input signal and a feedback signal are processed by the signal conditioning circuits and then are sent to the control chip, the control chip determines and operates to obtain a control signal, and the control signal is sent to an H-bridge driver to drive the electrical-mechanical converter to reach an expected control objective, wherein the control chip switches between a PID closed-loop control mode and a time optimal Bang-Bang control mode according to an error signal, thereby achieving the control objective of being high in response characteristic and not losing the precision.

Control surfaces secured tangentially to a round projectile, such that the lift force generated by the control surfaces is generated through the projectiles centerline. This eliminates the need for an opposing fin to counter roll moment. Sizing the control surfaces to form an equilateral triangle gives each panel equal span, and enables the force generated by two panels to be equal and opposite to that of the opposing panel. The end effect is that each panel only has two active states (neutral and positive deflection). Thus, a solenoid and a return spring may be used to control the canards. Additionally, the control panels may fold along the surface of the projectile, which frees up internal volume and minimizes the length of the control section.

According to a space vector pulse width modulation (SVPWM) method for a T-type NPC converter, a switch state within an arbitrary period is directly analyzed from a starting point of a three-phase modulation voltage, an allocation ratio and a compensation direction are determined according to amplitude and direction of difference between a positive bus voltage and a negative bus voltage and a current direction of maximum phase of an absolute value of the modulation voltage, and thus, a small vector is visually allocated again. The allocation proportion of the small vector is relevant to midpoint potential difference amplitude, a proportion regulator is used for regulation, the abrupt change of the modulation voltage caused by Bang-Bang control of a midpoint potential is prevented, and the harmonic content is reduced.

The invention relates to the technical field of filter absorbers, and discloses a filter absorber based on bang-bang control, which includes: a temperature sensor for collecting the ambient temperature of the filter absorber in real time and converting it into a temperature signal; a humidity sensor for The ambient humidity of the filter absorber is collected in real time and converted into a humidity signal; the power supply module is used to supply power to the filter absorber; the bang‑bang algorithm control module is used to receive temperature signals and humidity signals; the threshold adjustment module is used to provide power to the bang‑bang algorithm The bang algorithm control module sets the temperature threshold and the humidity threshold, and the bang-bang algorithm control module is used to compare the temperature signal and the humidity signal with the temperature threshold and the humidity threshold respectively, and when the ambient temperature exceeds the temperature threshold or the ambient humidity exceeds the humidity threshold Cutting off the power supply module and generating an alarm signal; and an alarm module, configured to receive the alarm signal for alarming. The invention can preferably improve the service life of the free exciter in the filter absorber.