The system software master module status alarm and device control communication program parameters are high. The monitoring system adopts microcomputer automatic control, A/D conversion digital communication and other technologies to realize the functions of automatic control of the working process of the generator set, digital collection of working parameters, working status, parameter Chinese character display, long-distance communication and centralized monitoring. When the monitoring signal exceeds the specified threshold, the system will automatically alarm and control, and if necessary, emergency stop. Diesel gasoline generator sets are currently widely used power supply equipment. Due to oil quality, load, mechanical failure, etc., diesel generators may have emergency faults such as cooling water boiling, oil shortage, overpressure, etc. during operation. If measures are not taken in time, phase loss or output voltage instability may occur. , causing the generator to burn out. Therefore, designing a monitoring system can quickly identify hidden troubles, so that the crew operators can take emergency measures in time to avoid damage to the generator set. 1 Development Ideas The whole monitoring system is mainly composed of the main control unit, sensor unit, switching control unit and remote monitoring unit. The system block diagram is as shown (available from the author). Li main control unit main control unit completes the collection, data processing, information display, keyboard input, relay control and remote communication of various parameters of the generator set. Various commands can be manually input or remotely received to switch the unit's working mode. The main control unit controller selects the MCS 96 series MCU, and the on-chip data bus and CPU of all models of the MCS96 series MCU are 16 bits. CPU peripheral logic circuit, using programmable logic circuit chip PSD312. The chip contains 8-bit address latch, 16 input and output programmable I / O interface, 4kx8RAM, 32kx8 program memory. It almost contains the peripheral chips required by the CPU, which makes the size of the main control unit much smaller. In the control system, the working mode and many parameters need to be modified on site, and it is required to be permanently saved after power off. In this project, I (C serial bus is attached to the advanced serial non-volatile memory (E (PRM) ), to achieve permanent preservation of readable and writable data. A/D conversion is realized by the CPU internal A7D conversion circuit. Since the A/D conversion in the CPU provides lObit precision, it can meet the collection requirements of the unit operating parameters, and because it is built in the CPU, data exchange can be performed by internal register mode. The internal interrupt mode provides the interface signal, so the software is highly efficient, and the anti-interference ability is to improve the friendliness of the human-machine interface. The 64x128 dot matrix liquid crystal display is used to display the working state, working parameters and parameter settings of the unit in Chinese characters, with Jian Cai Fuqing. Zhu Huabing Wang Shuzong's six touch keys “~ Confirm†and “Exit†realize all the display modes and parameter settings. According to the unit monitoring requirements, it is necessary to measure two cooling water temperatures, two lubricating oil pressures, three-phase unit voltage, three-phase output current, output power, three-phase mains voltage, starting battery voltage, and fuel level. . Since the 16-channel analog is time-divisionally switched by using multiple analog switches, the input interface of the A/D converter of the CPU is input through the isolation amplifier, thus ensuring the stability and anti-interference ability of the control system. For the controller, the sensor unit is composed of a front-end sensing signal conditioning circuit, a multi-path selection circuit, a sample-and-hold circuit, and four sub-units of the A/D converter. The user can realize the function conversion of the communication interface by simple parameter setting in the field. When using RS232 interface, you can select (software setting) to directly drive Mo-dem. The remote monitoring software of this unit adopts C programming and runs in Window895 environment. It can realize centralized monitoring of distributed multiple units through public telephone network. It can monitor 200 units at 100 points. When the utility power is abnormal, the monitoring system controller automatically starts the diesel generator set and speeds up the unit speed after reaching the delay judgment, reaches the rated speed and the timing combination brake, and automatically switches the power supply by the generator set; when the utility power returns to normal, the monitoring system controller After the delay is judged, the switch is switched to the mains supply, and the unit is automatically decelerated and stopped by the cold machine. 2 Monitoring station software design The overall software of the monitoring station starts from the general requirements and adopts modular design. See the overall structure block diagram. The following is a brief description of the main components of the software. The overall structure of the monitoring station software 2.1 Power-on self-test and initialization program After the instrument is turned on, it must be initialized first, mainly to set the working mode of each module of the system. Then the instrument starts self-test. An important function of intelligent monitoring is self-diagnosis and self-test, that is, self-test operation. The instrument self-test is mainly some test points in the detection circuit. These test points are stored in the ROM when the test value of the circuit is normal. During the self-test, the test value is compared with the normal value, if the two are equal or Within the range of the allowable error, PASS is displayed, otherwise an error is displayed (the fault location is indicated by the code). It is performed once the power is turned on (or the instrument is reset) and will not be performed during the subsequent measurement. (Continued from page 41) In the input signal of the microcomputer application system, there are generally various noise disturbances, which mainly come from the signal itself, the sensor or the external interference. In order to improve the reliability of the signal and reduce the influence of false information, the monitoring software uses a software method to achieve digital filtering. The digital filtering program is to improve the signal-to-noise ratio through certain calculations or judgments. The main program of the system A/D conversion adopts the inquiry method: inquiry A/D conversion. This method determines whether the A conversion is completed by detecting the S bit in the AD-RESULT register. 2.4 State alarms, relays and thyristors and other high-power device control program controllers When automatically detecting parameters, it is often necessary to judge whether the measured parameters exceed a certain limit, such as whether the water temperature is too low, whether the temperature exceeds the highest point, and whether the pressure exceeds the maximum limit. , or to determine whether the measured parameters are qualified, that is, whether there is any tolerance or not. After the limit is determined, a signal or a classification operation is also given, that is, a report or an emergency stop. The monitoring signal exceeds the threshold processing, that is, after the A/D conversion of the analog signal sent by the sensor is sent to the monitoring center through the communication port by the direct monitoring station, the monitoring center will alarm if it exceeds the threshold after real-time judgment, and if necessary, send it to the direct monitoring. The feedback signal is forcibly closed and opened by the direct monitoring station control relay. For the key signals, the direct monitoring station can judge itself and automatically process it on-site to realize intelligent monitoring and achieve the requirements of unmanned operation. The A/D conversion and digitally filtered signals are sent from the direct monitoring station to the monitoring center through the communication port, and the feedback signal of the monitoring center is received when necessary. 3 remote monitoring software remote monitoring software mainly includes: interface chip initialization; send interrupt processing program; receive interrupt processing program, centralized control program. The program flow is shown. The remote monitoring software diagram through serial communication, the main control microcomputer can collect the AC phase voltage, phase current, frequency / speed, lubricating oil pressure, water temperature, battery voltage and other parameters and working range of each generator set, when the unit working range When the standard is exceeded, the centralized control system will issue a false report. 4 Conclusion At present, the various parameters of the diesel generators of the military rely on the traditional oil pressure gauge, tachometer, oil level gauge, water temperature gauge, voltmeter, ammeter, etc., the accuracy of which can not alarm the fault. Intelligent monitoring and alarm system can achieve large information collection and high precision transmission. The control software can realize comprehensive system fault analysis and display for the controlled device, turn the simple lighting qualitative signal into quantitative analysis data, fundamentally realize the scientific management of the equipment, and greatly improve the monitoring working conditions. Certain faults can also be detected early to prevent losses caused by lag processing. Microcomputer monitoring of generator sets will become the development trend of equipment.
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