电脑控制汽油喷射发动机怠速不良原因浅析

近几年电控燃油喷射汽车逐年增多，在使用相当时间后，发动机出现怠速不稳时，人们却不知去如何排除这种现象。以下就其产生原因简单作一分析：1油门线是否拉的过紧和过松油门线过紧，使节气门开度增大，电脑信号电压稍高，喷油量增加，引起发动机怠速过高；油门线过松，给电脑信号电压滞后，使发动机加速工况不理想。2发动机冷却法温度传雷器电路在发动机起动时，由于转速不稳，传感器很难精确地、间接或直接地检测出发动机进气量以及计算出基本喷油持续时间。因此，在发动机起动时，电脑根据水温使感器转入的水温信号，在电脑存储器的温度…     

Study on rare earth electrolyte of SDC-LSGM

Ce0.85Sm0.15O1.925 （SDC） and La0.9Sr0.1Ga0.5Mg0.2O2.85 （LSGM） were synthesized using Glycine-Nitrate Process （GNP）, and the composite electrolytes were prepared by mixing SDC and LSGM. An X-ray diffraction pattern indicated that the mixture of SDC and LSGM consisted of their original phases after heating at 1450 ℃ for 10 h. The electronic conductivity of SDC-LSGM composite electrolytes were measured by direct current polarization method using Hebb-Wagner ion blocking cell at 700-800 ℃ in the oxygen partial pressure range of 104-10-20 MPa and compared with the results of SDC. Typical polarization curves, which were theoretically predicted, were observed on all the samples. The slopes of lgσe-lgPo2 plot for all the composite electrolytes agreed with the theoretically predicted value of-1/4 at some intermediate oxygen partial pressures and -1/6 at low oxygen partial pressure. The electronic conductivity of SDC-LSGM composite electrolytes decreased with the increase in LSGM content, whereas the ionic transport number ti of all the samples increased with the increase in LSGM content.