SX6130Q柴油机性能下降分析及其改进措施

本文通过对陕西汽车制造总厂ＳＸ６１３０Ｑ柴油机的性能下降进行分析，提出试验方案，并对测试进行分析，诊断性能下降原因，最后指出改进措施。     

6130Q柴油机增压机型主要件的改进设计

介绍了6130Q柴油机为适应增压和增压中冷机型的要求，参考对AVL公司的技术咨询，对主要件进行的改进。     

6130ZQ增压柴油机供油系统的改进试验研究

本文主要介绍了6130ZQ柴油机增压配套过程中,供油系统的调整和诸参数的变化及其对柴油机性能的影响。通过试验研究,初步确定了最佳方案,为今后进一步改善发动机的性能提供了参考。     

X6130柴油机塑料风扇研制

与钢板风扇比较，说明了塑料风扇具有效率高、噪声低、平衡度高等特点，依据风扇各参数与风扇性能的关系，综合考虑其它因素，确定了适宜的风扇参数及风叶布置方式，样品试验表明：新设计塑料风扇有优于钢制风扇，装机使用也证实了该风扇的使用可靠性。     

X6130系列重型汽车柴油机

介绍了X6130系列重型汽车柴油机的设计原则、主要零部件结构特点、性能指标及可靠性试验结果。     

Combined experimental and modeling methodology for intake line evaluation in turbocharged diesel engines

This paper presents a methodology for diesel engine intake line analysis that combines specific element tests and modeling. The purpose of this methodology is to determine the impact of intake lines, or newly designed intake elements, on the volumetric efficiency of internal combustion engines while avoiding expensive on-engine tests. For this research, the intake system is divided into several elements which are individually characterized using flow and impulse test rigs. Next, individual systems are modeled using a one-dimensional code. Finally, these component models are coordinated to provide an evaluation of the volumetric efficiency. Intake lines coming from two turbocharged diesel engines are used to illustrate the method. The model is validated by comparing the model results with the actual system performance evaluated in engine test cells. Discussions of the feasibility of the technique and on the impact of element model inaccuracies on the overall system model are provided.     

涡轮增压发动机排温控制装置

<正> 为有效地利用涡轮增压发动机的排气能力,研制了本装置,它可使涡轮出门的排气温度保持恒定。 本装置的工作原理如下;通过增压器的涡轮,把发动机气缸内产生的排气送入排气节能器。在这里,为了有效地利用排气能的热能,必须在增压器涡轮的出口,把排气温温度保持恒定。因此,用排温传感器检测的排气温度与规定的温度相等时,控制器把主旁通管的流量调整阀和增压空气旁通管的流量调整阀一起关闭,如果排气温度比规     

车用柴油机面临的挑战与应对措施

本文简要介绍了柴油机相对汽油机的优势,以及欧洲柴油机排放法规的发展,通过分析柴油机面临的问题及挑战,对车用柴油机为满足更严格排放法规应采取的技术措施进行了研究。     

增压柴油机排气再循环（EGR）控制系统的设计

因为某柴油机NOx排放超过国Ⅲ标准,根据据发动机EGR控制系统的要求和特点,为了控制氮氧化物的排放,设计了EGR控制系统的硬件以及控制软件,通过发动机排放13工况试验,结果表明效果良好。     

柴油发电机组电子调速技术综述

主要介绍了柴油发电机组中常用的几种电子调速技术的工作原理和实施路线。     

Phenomenological two-phase multi-zone combustion model for direct-injection diesel engines

This paper proposed a quasi-dimensional combustion model from a new observed two-phase penetration and combustion phenomenon in diesel spray. In the model, fuel spray was divided into two of liquid and gas phase areas. Considering the phenomenon that separation of gas and liquid phase in diesel spray occurs during spray penetration, gas and liquid area of spray are discretized respectively. Liquid phase areas play important role in fuel mass transport, however gas phase areas are the main region for fuel combustion in the model. Fuel and air mixing rate of gas phase zone is the key for the calculation of combustion rate. Validation experiments are designed by using optimal Latin hypercube design method. Comparison of calculations and experiments show that the model is able to predict diesel engine performance at different engine speeds, loads, and injection pressure and timing, and provides guidance for the design of engines.     

柴油发动机超速故障浅析

柴油发动机超速,俗称"飞车",是柴油发动机的一种特殊故障.它不仅会造成汽车零部件的严重损坏,而且还有可能危及人身安全.     

Modeling and validation of turbocharged diesel engine airpath and combustion systems

The ultimate aim of this study is the development of an engine modeling approach that would facilitate the design of model-based control techniques for diesel engines. This will allow for the development of more generalized, modular control strategies for different engine types and sizes as opposed to the commonly practiced map-based engine control strategies that depend on maps and feedforward control and require lengthy modifications every time a change is made. Also, most engine modeling studies focus on either airpath or combustion systems, treating these models and their validation individually, and not as an integrated system as is actually the case. To address the need for more realistic models suitable for model-based control design, this study develops a combined airpath and combustion model for the engine, using analytical models wherever possible and derives a model with appropriate control inputs and outputs that could be used in a control scheme. The inclusion of the actuator dynamics of the Exhaust gas recirculation (EGR), variable geometry turbine (VGT), and Throttle (THR) valves in the airpath model and the consideration of nonlinearities in the combustion model allow for the development of a more thorough engine model, as well as the validation of subsystems and the whole integrated engine model using a complete World Harmonized Transient Cycle (WHTC). This test cycle finds limited use due to its challenging transients, and yet, is the demanded test cycle for emission regulations nowadays. These are unique aspects of this modeling study, the results of which indicate that the developed engine model could be used in control design and hardware-in-the-loop simulation (HILS) based engine control prototyping.     

Physical-chemical properties of ethanol-diesel blend fuel and its effect on the performance and emissions of a turbocharged diesel engine

This paper deals with the main physical-chemical properties of ethanol-diesel blend and the effects of ethanoldiesel blends (up to 15% volume) on engine performance (full load torque vs. engine speed, BSEC vs. torque at 1400 r/min and 2300 r/min, and effect of start of injection angle) and emissions in ECE R49 tests (steady 13 points) using a 6.6 L inline 6-cylinder turbocharged direct injection diesel engine. The results show that an increase in ethanol fraction results in decreased viscosity of the blend fuel and very high distillation characteristics in the low temperature range. Solvents can improve the solubility of ethanol-diesel blends. The engine power was degraded proportional to the ethanol content (10% and 15%) due to the LHV (low heating value) of the blends. The higher latent heat of vaporization and lower CN (cetane number) of ethanol, which results from the steady state emissions of CO, HC, and SOF (soluble organic fraction), were much higher in the ECE R49 tests at low loads. Soot (solid mass) emissions were improved. The particulate matter emissions were significantly increased with higher blend volumes, and NOx emissions slightly increased with higher ethanol volumes. By increasing the injection angle properly, the performance parameters of the diesel engine were improved, but NOx emissions were deteriorated slightly.