【作者】 彭海勇；

【导师】 朱复谦； 黄大明；

【作者基本信息】 广西大学 ， 农业机械化工程， 2003， 硕士

【摘要】 本文在现有研究成果的基础上，针对这些研究工作所存在的不足，利用先进的计算机硬件技术和虚拟仪器软件技术，开发出一套可对柴油/酒精混合比例进行编程控制且在现有发动机上易于改造的柴油/酒精双燃料计算机控制试验系统。该系统采用了在LabVIEW平台上开发的PC总线—插卡式虚拟仪器系统，系统通过采集喷油泵的供油拉杆位置信号和转速信号，利用计算机计算得出柴油的循环喷油量，再根据程序设定的柴油/酒精比例控制数据采集卡发出一定宽度的脉冲，控制低压酒精喷射系统按比例将酒精喷入进气歧管。并通过试验论证了系统的可行性和可靠性。 本文还利用所开发的计算机控制双燃料试验系统在TY295D柴油机上进行了燃用柴油/酒精双燃料的性能试验。试验结果表明，本试验所采用的供醇方式由于柴油、酒精的供给分开控制，所以掺烧酒精对发动机的动力性即扭矩、功率等影响并不大；而且在不同工况下掺烧酒精，均能在不同程度上提高发动机热效率，降低其的能耗率，能耗率下降率最高达15％左右；此外，掺烧酒精还能使烟度大幅下降，随掺烧比的提高，排气烟度明显降低，在中高负荷阶段尤为明显，最高烟度下降率高达80％左右。同时试验还表明了，在不同转速、负荷下，最佳的酒精掺烧率并不是一定的。 在性能试验的基础上，还进行了三因素五水平的二次正交回归旋转组合试验，建立了能耗率、烟度、噪声、功率与转速、酒精掺烧率及负荷率之间的回归模型，通过分析可知，这些模型具有较高的可信度；利用这些模型，本文最后对不同工况下的最佳酒精掺烧率进行优化分析，并利用正交多项式回归，求出了最佳掺烧率与转速、负荷之间的回归模型，该模型在今后的深入研究中将起到一定的指导作用。更多还原

【Abstract】 In this thesis, a Diesel/Alcohol dual fuel injection experimental system controlled by PC is introduced firstly. This system is developed based on the current research and the advanced technology of hardware and virtual instrument. This system captures the rack position signal and rotate speed signal of the fuel injection pump, and calculates the circulating fuel injection quantity by programming the computer. Then the computer is programmed to control the DAQ board to generate a certain width pulse. Finally, controlled by the pulse, the alcohol injection system injects a certain quantity alcohol into inlet manifold according to a setting diesel/alcohol proportion. The workability and reliability of this system has been proved by experiment in this thesis.This thesis also introduces a dual fuel experiment on the TY295D diesel using the Diesel/alcohol dual fuel injection experimental system. The experiment shows that the method of alcohol supply used in the experimental system has little influence on power and torque of the diesel engine. The experiment also shows that energy consumption and soot emission of the diesel engine is improved at various diesel/alcohol proportions. The maximal improve ratio of energy consumption is about 15% and soot emission is about 80%, respectively. Under different rev and loads, the optimal diesel/alcohol proportion would be different.In order to find out the change rule of optimal diesel/alcohol proportion, an orthogonal regression rotating experiment of three factors (rev, diesel/alcohol proportion and load) at five levels has been carried out. Based on the experiment, four regression equations including energy consumption, soot emission, noise level, and power equations concerning the three factors have been established. These regression equations prove to be reliable. Depending on these four regression equations, the optimal diesel/alcohol proportions under different work conditions of engine have been found by optimizing analyze. And by using the method of orthogonal polynomial regression, a regression equation of optimal diesel/alcohol proportion concerning rev and load has been established. To a certain extent, this equation proves to be reliable and can be reference in the later researches.更多还原