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船舶柴油机电子控制的发展现状 总被引:1,自引:0,他引:1
论述船舶柴油机实现电控的必要性及其发展目标,并详细介绍国际上两家大型船舶柴油机生产厂家MAN B&W,Wartsila公司研制、生产的电控柴油机的原理与各个系统的组成及其性能的优越性. 相似文献
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本文从降低排放、提高经济性、增强动力性等方面阐述了柴油机电控的必然性,对柴油机电子控制原理及燃油系统主要参数的和了概要描述,并对电控系统的 作了初步预测。 相似文献
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由于发动机的发展,高速柴油机的喷油定时,将由精确的电子控制来取代目前使用的离心式定时器的控制。不过,到目前为上,这样的电子控制装置仍处于试验室的试验阶段。虽然一些制造厂家也发表了一些有关的文章,但真正能供重型车辆用的喷油定时控制装置至今尚未问世。 事实上,在一个重型车辆和寿命周期的总费用中,燃油费用所占的比重是非常大的。如果有一种可降低油耗的装置,那么可以肯定,是会受到用户欢迎的。基于上述考虑,笔者才试图设计出一种新型的燃油喷射控制装置。 这种新的燃油喷射控制装置系采用微型计算机和具有专用油路的液压执行器随发动机转速和负荷的变化来控制最佳喷油定时。 本文叙述了该装置的结构、工作原理、技术性能及市场反应等。 相似文献
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《汽车技术》2017,(9)
Heavy duty diesel vehicles compliant with current Euro VI/EPA13 emission limits employ aftertreatment systems based on DOC/DPF technology for soot and particulate matter reduction and SCR catalysts with urea dosing for NO x reduction. Traditionally, the majority of the control systems used for urea dosing are map based. However, increasing system complexity combined with real-world performance requirements are a strong motivation to switch to a model-based control approach. Firstly, this article describes a model-based design approach for aftertreatment control development. Focus is on urea dosing control for Euro VI level SCR systems. To achieve the legal emissions limits, including in-service conformity over the vehicle lifetime, advanced model-based control strategies enable maximal NO x conversion in combination with minimum ammonia slip, while ensuring robustness against real-life disturbances. Simulation and experimental results of the control system are presented, which demonstrate the performance and robustness properties. Following this model-based approach, a concept study is performed to explore aftertreatment and control technologies to achieve ultra-low NO x emissions as will be imposed by regulatory bodies in the near future. It is shown that aftertreatment concepts with Passive NO x Adsorber and SCR on DPF are most promising. To optimize overall engine-aftertreatment performance, the modelbased control approach is extended towards Integrated Emission Management(IEM). Based on the actual system state, this supervisory controller minimizes operating costs at each instant in time under all operating conditions. This is key for costoptimal and robust performance. 相似文献
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喷射式发动机是通过直接或间接测得的空气进入量信号来确定燃烧所需燃料量,并向喷射阀门提供开启与关闭信号,将一定压力的汽油量喷入发动机。该方式用于二冲程发动机可使排放污染物明显降低,经济油耗明显改善,燃油与空气混合十分理想。今后研究的课题是降低成本,提高制造精度和可靠性。 相似文献
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柴油机具有较好的经济效益。柴油机的初置费用较高,但其燃油经济性比汽油机高30%左右.加之柴油价格也比汽油便宜,因此经过一定里程的使用后.柴油机总的成本费用将会明显低于汽油机。由于柴油机没有点火系统和分电器,其故障率大大降低。因此.具有比汽油机更高的可靠性。 相似文献