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CAN-bus is applied widely in many industrial systems and vehicles. Nevertheless, in some cases, two or more distant CAN-bus segments are needed to transfer data. If the distance is too long, utilizing twisted wire pairs are impossible. In wireless method, GPRS is so far the reliable style. In this paper, a kind of CAN/GPRS gateway is designed to achieve the function of the wireless extension of CAN-bus.
The article is aimed to develop and research SHCAN2000 control system from a special I/O driver to the OPC standard interface. As SHCAN2000 using the FIX I/O specific driver of Intellution company, it's limited to FIX configuration software only, limits its applications greatly. The purpose of this paper is to closely follow the world's most advanced technology, using the OPC techniques, through the...
A hybrid network system is introduced aiming at improved requirements of production management and control in modern enterprise. The data gathering is realized through CAN Bus node, and the remote data transferring is accomplished by GPRS wireless network in the system. In this paper, the design process of hardware and software of wireless gateway is introduced in detail and the applying case is given...
According to the problems in getting the vibrate period-Tc and amplitude-Kc with the critical scaling limited method and relay-tuning method, based on step response and FFT, proposed a new method to obtain the frequency characteristics of the controlled object, then to obtain the TC, KC and PID parameters. In the step response, the initial steady-state value is usually not zero, which doesn't meet...
For the sequence diagram drawing in the intermittent control system software designing, gives analysis and evaluation for all existing sequence diagram drawing methods. On the base of existing state diagram, puts forward a kind of improved state diagram. The improved state diagram is simple and easy to use, very convenient in conversion to program language, and has strong checking function for process...
Urban expansion and land use change was studied in Jiangsu Province with RS and GIS technique, and driving forces was analyzed. Cities studied in this paper include 13 prefecture cities and 51 county cities. Remote sensing images include Landsat MSS, TM and ETM with time series from 1979 to 2000. Jiangsu Province lies in the southeast of China, which is one of the rapidest growing provinces along...
The online detection device for insulation resistance is proposed aiming at the character of the cable insulation mangled easily. The digital detection device is designed based on TMS320F2812 DSP. The configuration and function of circuits is introduced in detail, and at the same time, the software is given. The detection device for insulation resistance has the advantage of small size, low power...
By using upper-solution and lower-solution method of partial functional differential equations and oscillation theory of functional differential equation, the oscillation of a population equation with diffusion and delay was studied and a sufficient condition for all positive solution of the equation to oscillate about the positive equilibrium was obtained. Some known results are extended. Finally,...
The activity of modified copper-cobalt-chromium oxide catalysts for the hydrogenation of CO 2 to mixed alcohols(c 1 -c 6 ) has been investigated. The results showed that copper-cobalt-chromium oxide was a most effective catalyst for hydrogenation of CO 2 , with a high CO 2 conversion and an alcohol distribution from C 1 to C 6 . X-ray diffraction...
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