Research On Key Components Test Platform For Marine Low Speed Disel Engine High Pressure Common Rail System

Recently, IMO has cast increasingly strict requirements on marine discharging; also, ship owners are much more eager for the running economy of diesel engine. High-pressure common-rail electrical injection system employs flexible electro-hydraulic control technology as its core, thus becoming the main trend of current marine intelligent diesel. However, for the moment, domestic electrical fuel injection system mainly relies on the import from abroad, what?s worse, it is still in the preliminary stage to localize the research and design of key units, as corresponding test-platforms are needed for trying out new units. Aimed at this phenomenon, this paper independently developed a low-speed heavy diesel fuel injection system test-bed.First of all, this paper does an analysis on the key units of high-pressure common-rail system. Based on hydraulic pressure theory, the author builds mathematical modeling on FIVA valve, and points out the necessity of controlling key units through simulation. An overall design plan for the test-bed is given in accordance with its function requirements.Then, in order to solve the slow reaction of FIVA without rectification, this paper implements a specific study on FIVA valve by means of traditional PID and fuzzy PID. As shown by the results, both tradition and fuzzy PID can speed up FIVA reaction. Comparatively, fuzzy PID rectification reacts faster, and is stronger in anti-disturb while smaller in overshoot. To conclude, the fuzzy one performs better controlling functions.Thirdly, the author does a hardware design of the test-bed, which involves tasks as follows: calculation and modeling of key hydraulic pressure units, 3-D virtual assembling of the system with PRO/E software. With FP2 SH serving as its core controller, the layout of the electrical cabinet was realized with analog module, temperature, pressure, displacement sensors set by the function requirements. What?s more, this paper also did a discussion on anti-disturbing measures.Lastly, this part developed a monitoring software for the test-bed, including PLC controlling program as well as upper computer monitoring interface. The author designed programs on controlling temperature and pressure of the test-bed system and proportion relief valve glitch program. Filtering methods in processing PLC data, input/output calculation as well as the output of triangle and sine wave were discussed in this part. Employing Windows system as the developing platform, this part designed a user-friendly monitoring interface, which runs smoothly and realizes the monitoring function on test-bed on-site.