An Optimal Study On Computer Controlled Ethanol Injectiong Time Of TY295D Diesel Using Diese/Dual Fuel

In this thesis, a new method is adopted that the ethanol sprays is installed in the intake pipe of the diesel. But the existing research on the oil/ethanol double fuel is mixed before, and the mix proportion can not be changed with the engine operating mode. Using the new method, combining the existing experimental condition, utilizing sensor, data collecting card and virtual instrument, the electronic controlled system of the ethanol sprayed can be improved and perfected. Further more, taking advantage of the electronic control system, an optimal experimental study is carried on the oil/ethanol double fuel engine: Changing structure parameter of engine (the angle of the oil spray) and ethanol spray time, considering the mixed proportion of the diesel and ethanol, looking for optimum engine operating mode of the double fuel engine in which its strength, economy and smoke degrees are all better.The electronic controlled system of this experimental study is made up of hardware-the sensor and software-Lab VIEW, which are connected by PCI-6024E data collecting card. The signal transition circuit and the program help change the mixed proportion of the diesel and ethanol in time with the operating mode of the engine. Ethanol spray time is the bent angle corresponding the valve tappet's position of the first cylinder, which will be sure by the ethanol spray signal coming from sensor touched by the signal dish fixed on the oil pump. The signal dish impels the computer to produce a string of pulse of ethanol spray, the length of pulse is calculated by computer according to the mix proportion and the oil of diesel. The electronic control system can change the mix proportion frequently with the operating mode ofthe engine.The whole factor experiment is formed by three angles of oil spray and four ethanol spray time. Comparing the result between the original diesel and the double fuel engine at the same operating mode, the conclusion can be drawn that power, equivalent rate and smoke of the double fuel engine are all better than the original diesel's; In the best angle of oil spray, regard effective power, equivalent oil consumption rate, smoke as the experiment index, ethanol spray time, rev, load rate as factors, the orthogonal regression experiment is carried on, based on the experiment, three regression equations about effective power, equivalent oil consumption rate, smoke degree has been set up. The optimal operating mode of the engine has been found. The above-mentioned conclusions will be reference in the later deep research.