By modifying the deviation caused by the mechanical disturbance, production line of the motor speed constant, at the same time to ensure the production line efficiency. This system is a closed-loop control system based on motor speed.

This system uses the Proportional, Integration and Derivative (PID) control algorithm in the Programmable Logic Controller (PLC).

In the Programmable Logic Controller (PLC), the estimated value sampling in accordance with the set period of time. Assumption the time period is T. The initial value is zero. Using the rectangular Integration instead of precision

continuous Integration. Using the difference instead of continuous differential PID algorithm can be reduced to (1).

In the type: BS is System offset.

The algorithm has two characteristics, the one is fast

response the anther is less overshoot. In the robust performance and follow performance aspects, it has showed good control effect. The control system through practical application has achieved good control effect. This formula is explained in the PLC internal to a continuous control system is simplified as the discrete control system.

The filling machine adopts Hollysys LM series Programmable Logic Controller (PLC) for control to realize automatic operation, and the whole production line of automatic control. The principle of the section is the bottle out of the bottle washing machine and then into the bottle feeding screw filling machine, by piding chart thumbwheel to flat on the cylinder of the rotary table, such as Fig.2, rise the bottleneck, under the guidance of positioning device press feed opening form filling valve sealing .

After the bottle again pumping air into vacuum state, the back pressure in cylinder liquid carbon dioxide gas into the bottle, when the gas pressure in the bottle is equal to cylinder pressure, under the action of the spring, the valve is opened. At this time, under the guiding role, the liquid automatic into the bottle through the shape of the umbrella reflection ring on the muffler, carbon dioxide in the bottle recycle into liquid cylinder.

When the bottle reaching a certain height and it will back to the trachea closed, at this time, it will be automatic stop under liquid. Then put the liquid valve and valve closed, when the bottle is falling, drainage the pressure gas of bottleneck in order to prevent the liquid with gas spewing overflow. The filling is complete the whole part.

C. The Mechanical Structure 

1- Star dial wheel 2-Dial disc 3-Shaft Fig.2 The mechanical structure of transport bottle

III.HARDWARE  DESIGN

A. Controller selection

According to the requirements of field equipment control, and electrical cabinets control requirements, choose LM3106A programmable controller. The type of Programmable Logic Controller (PLC) have 14 points input and 10 points transistor output, a total of 24 digital I/O points, with 24 v dc power supply, On the terminal is DO, under the terminal is DI.

LM series Programmable Logic Controller (PLC) has a unique function of protection, it can realize users program and power outage maintain area’s data permanent save, the

machine eliminate the phenomenon of data loss for the reason of power lost; as well as, it support for internationalization in five programming languages, suitable for the needs of different programmers; LM series application field widely, have good customer base, so, the reliability and safety coefficient is dramatically well.

In addition to the module, there have three auxiliary modules too, respectively are LM3401, LM3320, and LM3310. CPU module integrates a certain number of I/O points, at the same time, one part of the I/O points have high speed counter, high output, and other functions .