30 results about "Bang–bang control" patented technology

A method for batch control in a system. The system comprises at least two batch processing sets that share at least one shared equipment. A batch is initiated in each processing set. Process variables from each batch are monitored. At least one process variable from at least one batch are adjusted using bang-bang control to prevent conflicts.

The invention provides a method for suppressing brushless direct current motor phase change torque fluctuation based on Bang-bang control. The method includes the following steps that (1), a work area of a motor is judged; (2), if the motor is located in a phase change work area, a torque fluctuation index is calculated and compared with an upper limiting value and a lower limiting value, and the step(3) is executed, and if the motor is located in a non-phase-change work area, the step (1) is executed again; the torque fluctuation index is a parameter reflecting the intensity of the torque fluctuation, and the upper limiting value and the lower limiting value are set values; (3), according to the comparison result between the torque fluctuation index, and the upper and lower limiting values, a turn-off phase of the motor is controlled to be turned off and communicated. The defects that according to an existing solution of suppressing the brushless direct current motor torque fluctuation, the optimal phase change moment is difficult to determine, implementation can not be performed within a full-speed range of the motor, and a control strategy is complex are overcome. The method can be effective and practical within the full-speed running range of the motor, the problem of phase change torque pulses of the motor is effectively solved, and running reliability of the motor is greatly improved.

A mechanism for regulating an engine by using an actuator that is controlled in bang-bang mode, in which non-linearities are introduced in the control strategy in order to avoid putting excessive demand on an electric motor. The actuator is controlled by power supply pulses, which is a specific type of bang-bang control and, therefore, the actuator can receive a certain number of discrete commands. In one example, the actuator can receive two types of commands, for rotating in one direction and for rotating in the other direction.

The invention relates to an automatic control method suitable for a closed-circuit cement combined grinding system. Four control loops, including a powder selecting machine rotating speed loop, a cement granularity loop, a weighing warehouse material level loop and an ultrafine fly ash elevator current loop, are extracted from the closed-circuit combined grinding system. As for the powder selecting machine rotating speed loop, bang-bang control is adopted to constrain an error of ground elevator current, and Fuzzy control is applied so that the tracking error of the ground elevator current is converged to be bounded; as for the cement granularity loop, bang-bang control and Fuzzy-PID control are adopted to control material feeding mount and powder selecting machine rotating speed; as for the weighing warehouse material level loop, bang-bang control is adopted to control the total given amount; and as for the ultrafine fly ash elevator current loop, bang-bang control is adopted to control large proportion of fine powder. Phenomena of grinding plugging, full grinding, empty grinding and ultrafine fly ash and ground elevator overload are effectively avoided so that cement production efficiency is effectively enhanced.

The invention belongs to a control technology for a medium-power axial flow fan and relates to a stable control method for the rotating speed of the axial flow fan. According to the scheme adopted by the invention, the stable control method comprises the following steps: carrying out logic synthesis through utilizing three pulse signals with a difference of 60-degree electric angle among each other, which are output by an axial flow fan position sensor, so as to obtain a speed feedback signal Speed-FB; capturing a count difference between the adjacent hop edges of the Speed-FB signal so as to obtain the frequency f of the Speed-FB, and further obtaining the rotating speed digital signal Speed of the axial flow fan; carrying out a window filtering process with sum and average filtering compensation on the Speed to obtain a real-time rotating speed Speed-BH required by closed loop control; finally adopting a BANG-BANG control algorithm to realize closed loop stable control on the rotating speed of the axial flow fan. The stable control method realizes stable soft starting and precise speed control on the axial flow fan, reduces pulses in the transient corresponding process of the axial flow fan and reduces noise in the running process.

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.

The invention discloses a Bang-bang control strategy-based optimal time tracking and capturing system and a Bang-bang control strategy-based optimal time tracking and capturing method. The system comprises a positioning module, a decoupling module, a communication module, an algorithm analysis module and a pursuit robot control module, wherein the positioning module, the decoupling module, the communication module, the algorithm analysis module and the pursuit robot control module are connected in turn. By the Bang-bang control strategy-based optimal time tracking and capturing system, a control algorithm is applied to an intelligent-agent robot for tracking and capturing an invader, the capturing time is the shortest under the condition that the invader linearly moves, the invader and a pursuer are positioned through visual information, the acquired position information is transmitted to a pursuit robot through wireless sensor node communication, and a rule of applying controlled quantity is obtained by the pursuit robot through algorithm analysis so as to control the pursuit robot itself and finish tracking and capturing.

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.

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 discloses an illumination analog system in high-speed vehicle passenger room, comprising a computer, an IGBT light modulator and a lamp set which are in turn connected, and an illumination sensor that is connected with the input end of the computer, wherein the lamp set and the illumination sensor are installed in the vehicle passenger room. According to the control characteristic of the rapid change of the illumination, the system combines the bang-bang control and the fuzzy control, parallel connects the lamp sets and controls them in groups, and has uniform illumination distribution and small illumination error; besides, the invention can tracking control the illumination change in each passenger room and well satisfies the research of the high-speed train illumination change on the passenger comfortableness effect relationship. In the current adjusting method, the illumination rapid change is analogized and the anticipant illumination value is rapidly tracked via the actual illumination. The bang-bang control is used for controlling the rapid change of the illumination and the fuzzy control is used for adjusting the overshoot of the illumination so that the precise control of the illumination is realized and the robustness of the illumination control system is increased.

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.