共查询到20条相似文献,搜索用时 15 毫秒
1.
高压共轨燃油喷射系统采用电控方式来准确的控制喷油量以保证空燃比。其中快速电磁阀的开、闭时间、电磁吸力等参数要求严格,这里以高速电磁开关阀为基础,对高速电磁阀的结构,开关特性等进行了讨论。 相似文献
2.
Y. Liu S. I. Hwang J. K. Yeom S. S. Chung 《International Journal of Automotive Technology》2014,15(3):353-359
Compressed natural gas (CNG) is regarded as one of the most promising alternative fuels. In the spark-ignition (SI) engine, direct injection (DI) technology can significantly increase the engine volumetric efficiency and reduce “pumping losses” in engines without a throttle valve. DI allows engine operation with the stratified charge which enables relatively higher combustion efficiency. In this study, a combustion chamber with a visualization system is designed. The spray development and combustion propagation process of spark-ignition direct injection (SIDI) CNG were digital recorded and analyzed. The ignition probability was also examined. The results of this study can contribute important data for the design and optimization of the SIDI CNG engine. 相似文献
3.
4.
5.
1 国家燃气汽车工程技术研究中心简介 2003年,国家燃气汽车工程技术研究中心经国家科技部批准组建,是我国燃气汽车研究开发、推广应用的核心单位.该工程中心位于重庆市北部新区汽车工业园区,其任务是对国内外先进、实用的燃气汽车技术、成果进行移植、推广,提高国内产品的市场竞争力,促进我国燃气汽车产业群体的发展.目标是成为我国燃气汽车领域的技术创新、成果转化、信息交流和人才培训中心. 相似文献
6.
7.
8.
9.
In this paper, an experimental study on the wall-impinging spray of the slit-type GDI injector is presented. To examine the
effects of various factors on the development of a spray impinging on the wall, experiments were conducted at various injection
pressures, ambient pressures, wall distances from the injector tip, wall temperatures, and wall inclination angles. Behavior
of the impinging spray was visualized using a planar laser scattering method. It is shown that the spray path penetration
of the wall-impinging spray increases with increases in injection pressure, wall distance, wall temperature, or wall angle.
On the other hand, the spray path penetration of the wall-impinging spray decreases with increases in ambient pressure. The
predicted spray path penetration calculated by the empirical equation estimates the spray path penetration in all cases, and
the empirical equation is optimized for the total injection pressure. 相似文献
10.
近日,无锡九龙公共交通股份有限公司从安凯客车定制了50辆CNG公交车,合同总额超过1000万。此举在为无锡市民出行带来极大便利的同时,无疑也会为保障无锡“绿色出行”和逐步减少公交系统对石油的依赖作出贡献。 相似文献
11.
12.
13.
韩国NGV经过6a(1992-1997年)的发展,开始试运行CNG客车。为了降低空气污染,政府于2000年1月开始向世界杯主办城市汉城投放CNG客车。 相似文献
14.
H. S. Heo S. J. Bae H. K. Lee K. S. Park 《International Journal of Automotive Technology》2012,13(2):167-173
In a conventional MPI engine, a pulsation damper is usually mounted on the fuel rail to diminish undesirable noise in the
vehicle cabin room; however, pulsation dampers are quite expensive. Therefore, several studies have focused on reducing fuel
pressure pulsation by increasing the self-damping characteristics of the fuel rail. This paper details the development of
a fuel rail that reduces pulsation using a self-damping effect. Using an oil hammer simulation technique, pressure pulsation
characteristics were investigated with respect to the aspect ratio of the cross-section, wall thickness, and fuel rail material.
Increasing the aspect ratio and decreasing the wall thickness efficiently reduced the pressure pulsation. In addition, the
pressure pulsation characteristics were investigated with respect to the resonant engine speed and injection period. These
simulated data can be used to reduce the pressure pulsation peak and to avoid the resonant point in the design stage during
the development of a fuel rail. 相似文献
15.
16.
17.
Y. Bai L. Y. Fan X. Z. Ma H. L. Peng E. Z. Song 《International Journal of Automotive Technology》2016,17(4):567-579
In this paper, the bond graph model of common rail injector was proposed in consideration of the effects of variable liquid capacitance and fuel physical property on the injection characteristics of the injector. State equations were derived based on the model, which were numerically solved by programming in Matlab. Comparisons between the simulation results and the experimental data show that the numerical model can effectively predict the injection quantity of the system. Effect of variation of delivery chamber diameter, needle seat semi-angle, needle cone semi-angle, ball valve seat semi-angle, nozzle hole diameter, inlet orifice diameter and outlet orifice diameter on fuel injection quantity had been analyzed. The influence rules of various parameters on the fuel injection quantity had been established. The experiments were conducted using face centered central composite design. A second order polynomial response surface model had been developed for predicting fuel injection quantity, as a function of the independent variables. Analysis of variation was used to determine the significance interactions which primarily affect the fuel injection quantity. It had been concluded that six interaction factors including delivery chamber diameter with nozzle hole diameter, needle seat semi-angle with needle cone semi-angle, needle seat semi-angle with nozzle hole diameter, needle cone semi-angle with nozzle hole diameter, nozzle hole diameter with inlet orifice diameter, and nozzle hole diameter with outlet orifice diameter have significant effect on the fuel injection quantity of the system. 相似文献
18.
B. H. Lee J. H. Song Y. J. Chang C. H. Jeon 《International Journal of Automotive Technology》2010,11(6):783-791
The diesel combustion process is highly dependent on fuel injection parameters, and understanding fuel spray development is
essential for proper control of the process. One of the critical factors for controlling the rate of mixing of fuel and air
is the number of injector holes in a diesel engine. This study was intended to explore the behavior of the formation of spray
mixtures, combustion, and emissions as a function of the number of injector hole changes; from this work, we propose an optimal
number of holes for superior emissions and engine performance in diesel engine applications. The results show that increasing
the number of holes significantly influences evaporation, atomization, and combustion. However, when the number of holes exceeds
a certain threshold, there is an adverse effect on combustion and emissions due to a lack of the air entrainment required
for the achievement of a stoichiometric mixture. 相似文献
19.
20.
废气再循环对天然气发动机性能影响研究 总被引:2,自引:1,他引:1
利用1台增压中冷天然气发动机,在2 840 r/min,75%和50%负荷、过量空气系数a为1.1~1.3稀混合气条件下研究了EGR对天然气发动机性能影响。结果表明:不同负荷和a下,随着EGR增加,NOx排放迅速降低,与单纯采用空气稀释相比,稀混合气加EGR联合稀释的方式更具降低NOx排放的潜力,75%负荷、a=1.3发动机达到稳定运行界限时(循环变动系数为10%)NOx排放降低到0.3 g/(kW.h),而单纯采用空气稀释时只能降低到1.92 g/(kW.h);当EGR率小于10%时,随着EGR增加,HC和CO排放缓慢增加,有效热效率缓慢下降,当EGR率超过10%后,HC,CO排放增加和有效热效率下降的速度都加快。小负荷时产生的NOx排放较少,且达到相同NOx排放目标值时所需的EGR量也较少,但是会产生较高的HC和CO排放及较低的热效率。 相似文献