喷油提前角

针对燃油喷射过程中的喷油提前角和喷孔锥角两个因素，本文应用三维CFD仿真软件AVLFIRE对CY4102直喷式柴油机的燃烧过程进行了数值模拟计算。

In this paper the CFD simulation software AVL FIRE is introduced to simulation combustion process of 4102 DI diesel engine in connection with the fuel injection advance angle and nozzle hole cone angle of fuel injection system .

喷油提前角延迟，则NOx生成物降低，放热率也有所降低。

Injection delay results in reduction of NOx and rate of heat release .

本文主要就环境温度变化对柴油机NOx排放的影响和改变喷油提前角来实现优化柴油机NOx排放的方法进行了较深入定性及定量研究。

This paper mainly analyzes influence on NOx-emission when the ambient temperature and angle of start injection change .

试验结果表明，喷油提前角、喷孔总面积、进水温度及进气密度对CO，HC，NOx的排放量有明显的影响。

The results show that injection timing , total nozzle hole area , inlet water temperature and inlet air temperature have obvious effect on exhaust value of CO , HC and NOx .

增大喷油提前角和共轨压力，改善了燃油混合质量，提高了最高爆发压力和缸内平均温度，使NOx排放升高，碳烟排放降低。

Advancing the injection or increasing the common rail pressure cause mixing improved , peak pressure and temperature raised . And thus NOx increased and soot reduced are observed .

随着喷油提前角向后推迟，TR燃烧系统的NOx排放下降，碳烟排放增加，上止点前11°CA喷油为最佳。

With fuel supply advance angle delaying , the NOx emission of TR decreases and smoke emission increases . In die BTDC 5 0 CA , NOX reduces less than before . The BTDC 11 ° CA is the trade-off of fuel supply advance angle .

研究表明：喷油提前角加大，缸内的压力、温度以及累积放热率都会增加，同时NOx和碳粒的生成也有所增加；喷油持续期的加大则会造成缸内压力的过多降低。

The results show that mean pressure , mean temperature and accumulated heat release will increase with advance of injection angle , but at the same time NOx and soot mass fraction will increase too ; the extended injection duration will result in mean pressure lower too much .

研究内容和结果主要包括：1.获得了单级喷射策略下，缸内气体压力变化曲线、温度分布和NOx分布规律；以及不同喷油提前角、不同负荷下，NOx的排放特性。

The results are as follows : 1 . The curve of the pressure in the cylinder and the distribution of the temperature and NOx with the single injection method , and the emission characteristic of NOx with different advance angles or different loads are obtained . 2 .

在相同喷油提前角（11oCA和13oCA）下，缸内最高燃烧压力随着喷孔直径的增大先降低，再升高，最后又降低；缸内NOX的排放量随着喷孔直径的增大而减少。

In the same advanced injector crack angle ( 11oCA and 13oCA ), the maximum in-cylinder combustion pressure decreases , then goes up , and finally declines with the nozzle diameter increases .

结果表明，通过适当推迟柴油机喷油提前角以提高其排气温度，并辅以燃油添加剂或利用催化剂降低微粒的活化能，在适当的条件下，进行DPF的主动再生是可行的。

The results show that in a suitable condition , it is possible to realize the DPF initiative regeneration by retarding the fuel injection timing to some extent to raise exhaust temperature and by adopting fuel additive or catalyst to decrease particulate activation energy .

喷油提前角对柴油机排放影响的研究

The Influence of Fuel Injection Timing on Exhaust Emission From a Diesel Engine

一种自动调节喷油提前角机构的研究

Investigation in An Advanced Injection Angle Self-Adjusting Mechanism

加大喷油提前角和喷油压力是促进物理准备过程的另一重要因素。

Spray advance angle and spray pressure is another main factor to promote the physical preparation .

喷油提前角、进气动压、冷却水温对柴油机排放的影响

The effects of advanced angle , inlet air pressure & cooling water temperatare on diesel emission

试验结果表明在30度左右喷油提前角时综合油耗最低。

The experimental results showed that about 30 degrees of injection angle gave the lowest consumption of fuel .

为保证柴油机燃烧完全并提高功率和节省能源，在日常维护保养中一定要注意检查各缸的最佳喷油提前角。

To guarantee complete burning , raise power and save energy , you must check oil-injecting advanced angle for every cylinder during daily maintenance .

最大爆发压力、最高燃烧放热率和最高燃烧温度随引燃柴油喷油提前角的增大而升高；

With advanced pilot injection timing or increased air temperature , the maximum pressure , the heat release rate and the temperature in cylinder increase .

重点介绍了喷油提前角的提前原理，点火正时齿轮的传统动模式，提前角的计算公式及其调整步骤，从而真正达到了简洁实效的目的。

This paper introduces the principle of injection timing advance , transmission mode of timing gear , calculation formula of timing advance and its adjusting steps .

通过调整共轨压力和喷油提前角，对排放区的B50工况点，在发动机试验台架上进行了性能与排放的测试分析。

In the dissertation , the experiment of engine performance and emission were carried out on the test bench through adjusting rail pressures and injection advanced angles .

计算结果表明，选择合适的压缩比、喷油提前角，可以改善缸内的燃烧过程，降低燃油消耗率。

The calculation result indicates that choose the appropriate compression ratio , the angle of fuel injection can improve the cylinder burn and reduce the fuel exhaust .

计算结果表明：单次喷射时，共轨压力和喷油提前角变化对最大压力升高率、最大爆发压力、放热率均有较大影响，喷油提前角的变化相对影响较大。

The calculation results show that : in single injection , the changes of common rail pressure and injection angle have greatly affected the three targets above .

在试验验证所建模型的基础上，分析了引燃油量、喷油提前角和发动机转速对柴油引燃天然气发动机性能的影响。

On the basis of experiment , studies in variation of engine parameters with quantity of pilot , injection timing and rotate speed of the engine were carried out .

分析研究了压缩比、喷油提前角对柴油机燃用生物柴油的影响，提出了以动力性、经济性和排放性为优化目标的发动机优化控制方案。

Analyzing the impacts from the diesel engine compression ratio and advanced-injection angel to biodiesel-diesel mixture , and proposing an optimization control scheme which aims to optimize characteristics of power , economy and emission of diesel .

电控单体泵系统首先在油泵台架标定完成最基本的系统标定，然后在发动机台架上进行发动机外特性标定，也就是根据排放的优化值来选择外特性曲线上的最佳喷油提前角。

The basic mapping of EUP system can be done on FIE test rig , while engine full load curve should be calibrated on engine test bench , which actually is to optimize injection timing according to emission performance .

研究表明，适当增加引燃油量和减小喷油提前角可以降低柴油引燃天然气发动机的最大缸内压力升高率，从而有利于遏制柴油引燃天然气发动机高负荷时的爆震倾向。

It is revealed that increasing the amount of pilot fuel and retarding the fuel injection timing suitably will reduce the maximum pressure rise rate effectively , and this is beneficial to keep an engine away from knock at high load .

最后，在计算和查阅相关技术资料的基础上，给出了环境温度变化时的应对措施和如何改变喷油提前角来实现最优化柴油机排放的方法。

Finally , in the computation and in the consult correlation technology material foundation , the paper gives out the measure when the ambient temperature change , and how to adjust the angle of start of injection to optimize diesel engine NOx-emission .

喷油泵供油提前角失常的诊断与调整

Fauit Analysis and Adjust of Oil Supply Abnormality of Oil pump of Fuel

在发动机模拟软件AVLboost上使用均匀试验设计方法安排了不同水平的喷孔直径、喷油压力、喷油提前角和燃烧室压缩比对柴油机性能影响的模拟试验。

By using uniform design experimentation , a simulation test based on AVL boost was done to study the influence of nozzle diameter , injection pressure , injection timing and compression ratio on performance of diesel engine .

单片机实现喷油泵转速和提前角的高精度测量

High Precision Single Chip Computer-Based Measurement of Speed and the Advanced Angle for Oil Feed Pump

通过改变喷油脉宽和点火提前角来优化怠速排放指标。

The Idle exhaust emissions have been researched by adjusting the injection pulse and ignition advanced angle .