发动机电控汽油喷射系统及其维修技术(Ⅰ)

论述了发动机电控汽油喷射系统的发展概况及其分类方法，并对其进气系统、燃油供给系统和电子控制系统构件的结构和工作原理进行了详细介绍。提出了5种检测电控汽油喷射系统故障的方法，并以丰田汽车公司皇冠3．O轿车用2JZ－GE型发动机的电控汽油喷射系统为对象，介绍了用万用表检测技术参数法对其进行检修的步骤和方法。     

电控喷油器流量特性的试验研究

本文着重对喷油器流量特性的几个影响因素进行了试验研究。为电控喷油器的开发研制提供了一些重要建议。     

汽车误踩油门纠错装置的设计

通过分析汽车误踩油门现象的原因及纠错装置研究现状,针对汽车误踩油门的误操作现象进行了更深入的研究,采用油门踏板加速度的不同来辨认误踩油门的可靠信号,并在此基础上设计了一种防止误踩油门的机电装置。     

二甲醚-柴油混合燃料在柴油轿车上的应用研究

采用电控单点二甲醚进气管气态喷射系统,在捷达SDI柴油机上进行了二甲醚-柴油混合燃烧的试验研究.在发动机工作范围内对二甲醚-柴油的混合燃烧比率进行了优化,确定了二甲醚-柴油混合燃烧掺烧比脉谱.在轮毂试验台上对改装后的二甲醚-柴油混合燃料轿车进行了试验,并对试验结果进行了分析.     

浸管式加热装置的数值模拟及应用

针对浸管式加热装置设计中普遍存在的热平衡计算复杂、致使设计的加热装置耗能大、热效率低或加热功率达不到生产要求等问题。利用相关的物性参数和经典的燃烧学、传热学公式,编写了用于浸管式加热装置设计的计算机模拟程序。实践表明：程序模拟的结果与实测结果较为吻合。模拟程序的使用可以方便准确的进行设计方案的比选,为浸管式加热装置的设计提供了非常有效的工具。     

西柏坡电厂铁路专用线与朔黄铁路并行段石方隔坡定向爆破技术应用

结合西柏坡电厂铁路专用线工程,介绍了与既有朔黄铁路并行段土石方开挖所采取的隔坡定向爆破工法的爆破原理、设计方法以及施工技术措施和效果,为今后类似工程提供了参考依据。     

桥梁大位移伸缩装置使用浅谈

介绍了目前国内模数式大位移伸缩装置结构及其使用情况,提出大位移伸缩装置选用建议及改进方案;根据国内中梁型钢的材料及断面尺寸,计算多缝支承横梁的合理布置间距;还介绍了梁端运动的主要因素及伸缩装置缝宽计算方法,并结合实例进行说明。     

电控汽车电器元件的工作特点及防护

汽车电子元器件工作的可靠性与稳定性,直接关系到汽车工作性能的好坏。而电子元件在工作过程中常会遇到各种各样的干扰,不仅能造成系统测量和控制失灵,而且有可能令系统无法正常工作,因而做好汽车电器元件的防护成为其正常工作的保证。     

校园多媒体设备管理和使用的探讨

多媒体技术在教学中的应用越来越重要,它不仅改变了学习手段和学习环境,更改变了教学观念.要发挥好多媒体设备的作用,必须对多媒体设备进行科学的管理和正确的使用.结合广州航海高等专科学校多媒体设备的实际情况进行一些探讨.     

Study of the post-derailment safety measures on low-speed derailment tests

Prevention of train from derailment is the most important issue for the railway system. Keeping derailed vehicle close to the track centreline is beneficial to minimise the severe consequences associated with derailments. In this paper, the post-derailment safety measures are studied based on low-speed derailment tests. Post-derailment devices can prevent deviation of the train from the rail by catching the rail, and they are mounted under the axle box. Considering the different structures of vehicles, both trailer and motor vehicles are equipped with the safety device and then separately used in low-speed derailment tests. In derailment tests, two kinds of track, namely the CRTS-I slab ballastless track and the CRTS-II bi-block sleeper ballastless track, are adopted to investigate the effect of the track types on the derailment. In addition, the derailment speed and the weight of the derailed vehicle are also taken into account in derailment tests. The test results indicate that the post-derailment movement of the vehicle includes running and bounce. Reducing the derailment speed and increasing the weight of the head of the train are helpful to reduce the possibility for derailments. For the CRTS-I slab ballastless track, the safety device can prevent trailer vehicles from deviating from the track centreline. The gearbox plays an important role in controlling the lateral displacement of motor vehicle after a derailment while the safety device contributes less to keep derailed motor vehicles on the track centreline. The lateral distance between the safety device and rails should be larger than 181.5?mm for protecting the fasteners system. And for the CRTS-II bi-block sleeper ballastless track, it helps to decrease the post-derailment distance due to the longitudinal impacts with sleepers. It can also restrict the lateral movement of derailed vehicle due to the high shoulders. The results suggest that, CRTS-II bi-block sleeper ballastless track should be widely used in derailment prone areas.