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 Wysłany: Nie 6:03, 26 Gru 2010 Temat postu: ugg milano Automotive air conditioning compressor |
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Automobile Air Conditioning Compressor Durability Test Rig
Inspection station by adjusting the evaporator heated by electric heater set to control the number of suction pressure. f41 subjects compressor discharge pressure regulator to be tested is to regulate the compressor discharge pressure condensing pressure. Cooled by circulating water cooling tower water-cooled shell and tube condenser pressure regulation is the key to controlling the temperature of cooling water, cooling water cycle by changing the amount of adjustment in the cooling tower inlet and outlet pass on the set regulation. f5) was tested by the compressor off time of continuous operation durability test test compressor running time of automatic control by preset timer. Timer with memory function, an accident can be saved after power has been completed the time, calls continue after the trial. When the tests of time to reach the preset value, automatically cut off the test power supply,[link widoczny dla zalogowanych], the end of test. Start off by testing the durability of the compressor start and stop time of trial, and off set the number of counts, through the multi-function timer and preset counters to control. Time is running or stopped automatically after the completion of the required value of the open stop state transition, and the number reaches the preset value off automatically after power cut off the trial to end the test. The test bench has three temperature measurement points, respectively, were tested for the ambient temperature and the compressor suction temperature, exhaust temperature; pressure measuring point there are two, respectively, were tested for the compressor suction pressure and discharge pressure, are used special sensor transmitter and digital display instrument for real-time monitoring. In addition, the transmitter also has 4 --- 20mA standard current signal output for data acquisition and processing computer system for data exchange. Electrical control cabinet to set the power switch,[link widoczny dla zalogowanych], adjust button, digital display instruments, such as, real-time display of all test data, test during the operation can be completed in the control cabinet. 2.2.4 Test data acquisition and processing computer system design data acquisition and processing system is the site of information and communication bridge between the computer system, from the front of the transmitter responsible for the temperature, pressure and other standard current signal into the analog data acquisition card to convert into a digital signal and then use IPC to the experimental data processing in real time, thus saving human resources effectively to improve the reliability of the test. Each computer unit can simultaneously manage multiple basic test unit. It should be noted that, in the control system, data acquisition card is only to solve the signal input, output, software is the key, the user can modify the software, change, or change the control system functions. According to design requirements, system software can realize some of the following functions: tests begin, the user can set the test parameters; end of the experiment, you can open the test since the beginning of the historical data View the full test data; test conditions displayed on the screen in real time ; after the end of the test print and store test data and test reports. This should especially point out that, due to the installation site may be the presence of electromagnetic interference image, the signal transmission will have some impact, so the process of compiling the software to consider the signal filtering, to the maximum extent possible to avoid fluctuations in non-normal data . 3 Conclusion In summary, the basic durability test systems and computer data acquisition and processing system composed of a complete automotive air conditioning compressor durability test rig. After repeated audit demonstration, and practical application in the production of fully proven design of the test bench is reasonable and feasible, can be many types of automotive air conditioning compressor durability testing, wide applicability,[link widoczny dla zalogowanych], advantages and disadvantages can be summarized the following two aspects: (1) The test stage can be used as an independent, a sound system which applied in actual production for small automotive air conditioning compressor product development, and styling products in the sampling and the required durability test Start durability test,[link widoczny dla zalogowanych], the technical performance of similar products to the domestic advanced level, good stability, high reliability, operation and maintenance more convenient. (2) in the development time and project funds permitting, can be designed from the test bed to further improve the following aspects: to enhance the computer system to control the basic unit of durability test, the test stand operation more convenient and reliable, improve the system stability: further improve the vibration test-bed system noise immunity. References [1] Fu Qi. Automotive air conditioning compressor life test bed design research,[link widoczny dla zalogowanych], automotive technology, 1996 (11) [2] Xia Haifeng Qian Chen Qi. Low-power life test bed for air-conditioning compressor, motor technology, 1998 (3) [3] Zhang Junwei. Air conditioning compressor durability test bed starter motor electrical technology, 1999 (2) [4] Bin. Modern Auto Air Conditioning Compressors Control Technology. Beijing University of Aeronautics post-doctoral thesis. 2000 (6) [5] Zhang Zhongxiu. Automotive air conditioning compressor durability test rig design. Bachelor Thesis of Tongji University. 2004 (6)
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