The small given flux(0.005 kg/sm~2～0.3 kg/sm~2)is controlled by a transducer using PID algorithm together with numerical processing . The control accuracy is within ±1% of initial value .
This article describes the principle of frequency conversion timing control system for constant pressure water supply by means of the technology of LonWorks field bus, and analyses the PID algorithm of frequency conversion control nodes.
Then, it studied the different control effect of the three control regulation: Proportional control, Integration control and Differential control in the increment PID algorithm.
Then, it studies the different control effect of the three control regulations:Proportional control, Integration control and Differential control in the increment P1]) algorithm and concludes that the physical signification of the three parameters: Kp, Ki and Kd in the increment P11) algorithm is different from that in the analog PID algorithm or the position-type P11) algorithm.
Subordinate stations use fuzzy control technology to control the load of the mid-discharging mill, the load of the air swept mill, the temperature of decomposing furnace, the temperature of firing zone, the temperature of exhaust gas, thetemperature of secondary air and the load of the cement mill, use PID algorithm control of cumulate windage to control raw material batch and cement batch. These control methods accomplish the real-time supervisal, analysis and optimization of the cement rotary kiln.
Using the ITAE criterion as a performance index,the method is presented for obtaining optimum tuning parameters of the PID algorithm expressions of main loop and vice-loop in the direct digital cascade control systems through the use of simplex method and step by step approximation method.
Single chip microcomputer layout the route of the robot by PID algorithm according to the information of the sensor and the robot was driven by the PWM system.
AT 89C 52单片机根据传感器提供的信息,采用P ID算法规划行驶路径,由PWM系统驱动直流电动机完成机器人的行走。
MATLAB simulation showed that,compared to the conventional PID algorithm,the proposed control scheme had good dynamic and static performances and could adapt itself to the change of plant parameters,thus proving its strong robustness and adaptation.
The fuzzy PID algorithm is outlined using the fuzzy set theory.
We improved the PCP nutristat by incorporation of a personal computer with a proportional integral derivative (PID) algorithm for controlling the medium feed pump.
A comparison of the efficiencies of the maximally rapid-response prognostic algorithm and a PID algorithm in a closed-loop autom
Using a PID algorithm, the pulse width is calculated from the subtraction between the desired force thrust force and the measured thrust force.
The second step is to use these velocities along with transceiver velocities as inputs to the PID algorithm.
This paper describes the use of a 1P801 SBC in the investigation on thermoluminescence and temperature dependence of luminescence to fulfil the requirement of automatic temperature control and automatic measurement of physical parameters. The system may acts as a constant temperature controller in order to study the relations between luminescence characteristic and temperature. It also may give heating rates of 4℃/min, 6℃/min,10℃/ min and 12℃/min in order to study the depth of trap level and their dis- tribution...
This paper describes the use of a 1P801 SBC in the investigation on thermoluminescence and temperature dependence of luminescence to fulfil the requirement of automatic temperature control and automatic measurement of physical parameters. The system may acts as a constant temperature controller in order to study the relations between luminescence characteristic and temperature. It also may give heating rates of 4℃/min, 6℃/min,10℃/ min and 12℃/min in order to study the depth of trap level and their dis- tribution in samples. In addition, the computer may carry out the measurement of luminescence intensity and the calculation of the depth of trap level.Adopting computer Direct .Digital Control (DDC) and Sequence Control Counter (SCC), the system is flexible for changing or increasing its functions.This can be done simply by changing the system software.Fig.1 is the schematic diagram of physical experiment system. Fig.2 is the block diagram of computer control system.Adopting access form of temperature table, in the design of software, we are relieved from the tedious correction of experimental result.It is easy to change the temperature table when the thermocouple is changed.Z80-CTC is programed as a timer interrupting the Z80-CPU at time intervals desired and the Z80-CPU performs service programs once every interruption (controlling algorithm and measuring program etc.).It is the time base of linear heating. Having separated PD from PID by using algorithm logic in PID algorithm, we get an advantage that the overcorrections of variable to be controlled are decreased and the times to reach stabilization are shortened.In the design of hardware, interface circuits are suitable to different heating systems and multiparameter measurement. The measured thermolu-minescence curve may be printed by TP801-P microprinter and displayed on an oscilloscope. The real-time temperature and the deviation of the control system are displayed by LED (light emitting diode) of TP801. With these universal interface circuits, the system may be used in other experimental systems which need temperature controlling, multichannel measuring and general calculates.The sampling and middle value filter subroutines as well as the main program flow chart are recommended in this paper (see Fig.3,4,5). Incremental value equation of PID algorithm is also suggested.Fig.6, Fig.7 and Fig.8 are the examples of experimental curves. Fig.6 is the thermoluminescence curve of ZnS: Cu,Co which is measured with the temperature of the system automatically controlled (above room temperature) and printed by TP801-P microprinter. Fig.7 is the thermoluminescence curve of the same sample which is measured with the manual temperature control and plotted on a X-Y recorder. Comparing these two curves, we can see that the resolution of trap energy spectrum is improved when heating rate is controlled by the computer. Fig. 8 is the emission spectra cf Y2O2S:Eu (1×10-4) at different constant, temperatures which are controlled by the computer. The curves were plotted on a X-Y recorder.
Introduced is a new method of PID self-tuning for DDC systems based on critical proportion band approach, where the system is forced to maintain a constant-amplitude oscillation by a software embodying relay element performance that dead zone as well as hysterisis characteristics is not likely discerned with. Evaluation of parameters at critical oscillations can be obtained by measuring the amplitudes and the periods therein; and, according to the expanded critical proportion band method, evaluation of...
Introduced is a new method of PID self-tuning for DDC systems based on critical proportion band approach, where the system is forced to maintain a constant-amplitude oscillation by a software embodying relay element performance that dead zone as well as hysterisis characteristics is not likely discerned with. Evaluation of parameters at critical oscillations can be obtained by measuring the amplitudes and the periods therein; and, according to the expanded critical proportion band method, evaluation of PID parameters can readily be worked out and bestowed on the PID algorithm to render self-tuning.
Using the ITAE criterion as a performance index,the method is presented for obtaining optimum tuning parameters of the PID algorithm expressions of main loop and vice-loop in the direct digital cascade control systems through the use of simplex method and step by step approximation method.This method is accurate,reliable,convenient and easy to grasp.It presents direct digital cascade control systems with a set of optimum tuning parameters.Because researched object is a first-order time delay moder with...
Using the ITAE criterion as a performance index,the method is presented for obtaining optimum tuning parameters of the PID algorithm expressions of main loop and vice-loop in the direct digital cascade control systems through the use of simplex method and step by step approximation method.This method is accurate,reliable,convenient and easy to grasp.It presents direct digital cascade control systems with a set of optimum tuning parameters.Because researched object is a first-order time delay moder with universality in process control, the method has practical significance.The method with optimization is given for optimization design ofp arameters of cascade control systems.
pid algorithm
pid算法
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