A Real-time Control Method for Improving the Steady State Accuracy of Mixing Drug Concentration in Drug Mixing Device
A technology of steady-state accuracy and real-time control, which can be used in various fluid ratio control and other directions, and can solve problems such as increasing the concentration error of mixed medicines
Active Publication Date: 2017-05-31
JIANGSU UNIV
View PDF10 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
However, due to the limitation of the resolution of the actuator and the measurement sensor, when reaching the steady-state equilibrium state, Q p and Q w Fluctuates with a certain cycle at the equilibrium position, if one of the two flows is in the positive half cycle and the other is in the negative half cycle, resulting in an increase in the concentration error of the mixed drug
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0107] Step 1: Obtain the liquid medicine flow control system with the voltage or current signal input to the liquid medicine flow regulating valve as the input, the liquid medicine flow entering the main pipeline of the sprayer as the output, and the liquid medicine flow control system with the water overflow valve input as the output. The first-order inertia delay expression of the transfer function of the water flow control system with the voltage or current signal as the input and the water flow entering the main pipeline of the sprayer as the output.
[0108] Store water and liquid medicine in water tank (1) and medicine tank (15) respectively in advance, set the mixing concentration and spray volume through controller (16), under the action of tractor power output shaft (17), and tractor power The water pump (2) connected to the output shaft pumps water into the main pipeline of the sprayer. When the speed of the water pump is constant, the controller controls the voltage...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention provides a real-time control method for improving the steady precision of mixed pesticide concentration of a pesticide mixing device. The real-time control method comprises the following 4 steps: step I, a first-order inertial delay expression of transfer function of pesticide flow rate and water flow rate is obtained; step 2, the relational expression of steady oscillation amplitude of a controlled object under the action of a PI (Proportional Integral) controller is derived; step 3, the influence mechanism of the PI controller parameter Kappa c and Tau i on the steady oscillation amplitude a; step 4, the PI controller parameter is adjusted, and the steady oscillation amplitude of the controlled variable of the control system, to be specific, the pesticide flow rate and the water flow rate, are adjusted. The real-time control method is scientific and ingenious in conception, proven by experimental verification, high in self adaptability and timeliness, provides the method for improving the steady precision of fine control process of pesticide concentration, which is simple, convenient and rapid to operate and low in cost, and provides a new approach for precision control of the practical industrial control system.
Description
[0001] (1) Technical field [0002] The invention relates to a real-time control method for improving the steady-state precision of a drug mixing device in a drug mixing device. This method can improve the steady-state control accuracy of the mixed drug concentration by dynamically adjusting the controller parameters. It belongs to the field of intelligent equipment and control. [0003] (2) Background technology [0004] Compared with the traditional pre-mixing method, the online drug mixing is characterized by the separation of the drug box and the water tank, and online mixing of the drug through the drug mixing device during work. The online drug mixing device can realize the change of pesticide concentration according to the severity of pests and diseases, increase the concentration of pesticide solution in areas with severe pests and diseases, and reduce the concentration of pesticide solution in areas with light pests and diseases, so as to achieve on-demand mixing acco...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G05D11/13
Inventor 李晋阳魏新华
Owner JIANGSU UNIV