Ma Yuquan

Design of a new measurement and control system of CO 2 for greenhouse based on fuzzy control

A greenhouse carbon dioxide concentration measurement and control system is designed based on fuzzy control with infrared carbon dioxide gas sensor, and the choice of the control structure parameters are given. According to the experience, the main points of the design of control rules are induced, and the carbon dioxide concentration fuzzy controller is constructed with relevant fuzzy logic. The modular structure is used for system hardware and software design, enhance the versatility and flexibility of the use of system. The application shows that the carbon dioxide measurement and control system achieved using fuzzy control is running stable, fast response, has broad application prospects.

A control system of environment parameters of greenhouse group based on double CAN bus

A control system of environment parameters based on double CAN bus is designed according to the needs of monitoring and control of modern greenhouse group. The system is composed of upper PC, external CAN bus, outdoor weather elements and monitoring and control units of greenhouse. The monitoring and control unit of greenhouse is composed of several modules linked by inner CAN bus. CAN bus is used between PC and every greenhouse, anywhere in the communication line the monitoring and control unit of greenhouse is joined up, and it is suitable for concentrated group control of greenhouse on a large scale. The control module is designed with sealed moisture-proof and independently, by which equipment breakdown is reduced and the life is lengthened. Each module of greenhouse are connected by inner CAN bus, and the types and number of the modules can be increase or decrease freely, which facilitated data exchange and improved the flexibility of system. PC-software is developed by using Kingview, by which the development cycle is shorten and a friendly human-computer interface is gained.

New environment parameters monitoring and control system for greenhouse based on master-slave distributed

According to the actual need of monitoring and control of greenhouse environment parameters in rural areas, a master-slave distributed measurement and control system is designed, in which PC is taken as the host. The system consists of PC, soil moisture measurement and control module, temperature and humidity, and CO2 monitoring and control module. In the system, PC has large amount of data storage which is easy to make use of fuzzy control expert system, configuration software—KingView is used to develop software for PC, by which the development cycle is shorten and a friendly human-computer interaction is provided. Each monitoring and control module consists of STC12 series of microcontrollers, sensors, relays etc. Different modules are select based on the need of system to achieve control of greenhouse in partition and block.

Image Detection to Vehicle Queue Length of Crossroad Based on DSP

An image detection to vehicle queue length at crossroad based on DSP is presented in this paper. It describes the hardware structure and the main program of the image detection system, as well as the vehicle queue length extraction method. The system is applied to the city traffic signal control machine, and it shows the system is better than the means of using inductance coil on precision, fixing and etc.

Calculation of the Filter Parameters for the Aluminum Electrolyzation Rectifier

In this paper, the rectifier transformer third winding to install high-pass filter have been studied, and the calculating method of the high-pass filter parameters have been put forward. The power factor and the filter parameter of three series rectifier unit in a company are calculated, then it’s discovered that the practical operating parameter tallies with theoretical result and the practical power factor fits with the theory in one of the series of filters, and this attain the system requisition, so then demonstrates the parameter calculation method in this paper is correct. It is suggested that the capacitance capacity of the high-pass filter of the third winding in aluminum electrolyzation rectifier unit should be calculated according to meeting to the displacement factor compensation requisition, that is, cut-off frequency: 3th harmonic, resonance frequency: 7th harmonic, quality factor: 5 or so, m: 0.2 or so, resistance: ≤10Ω. The greater the filtering resistance, the stronger the harmonic impedance, which will affect the harmonic filtering effect.

Research on Remote Monitoring of Large-Scale Oil Tanks Based on Web

To overcome many shortcuts of oil tanks which were mostly based on manual operation in the past, we developed one new remote online monitoring system based on Web. The CAN Bus is core of lower layer control network, and design of CAN Bus intellect node is given. Software design was set forth based on adapter CANLite. The WebSnap middleware and ADO components in Delphi 6.0 are used to build Web server that was based on B/S access mode. The system software principles were discussed in emphases. Debug results and Web released method were given. Seamless connection has been realized between CAN and Internet/Intranet. Users can monitor oil tanks parameters by general IE browser on off-site. The system application prospects were given finally.

Research on remote monitoring system of petrochemical farm tanks based on Web and CAN

Three layers of petrochemical farm tanks monitoring system structure were presented based on B/S, including software and hardware designs of bottom control network based on CAN, interface layer server and top layer designs. That middleware WebSnap and ActiveX ADO were used to design Web server is discussed in emphasis. Communication mechanism between Web server application and control program based on CANmini adapter was discussed. Connection of Web server application and database was also discussed in the paper. System debugging has been completed, and exchange with CAN bus data and Internet information has been realized. The system has wide application in petrochemical industry.