进气门预开启对柴油机内部废气再循环率控制适应性研究

发布时间：2018-05-18 00:42

本文选题：内燃机 + 柴油机　；参考：《内燃机工程》2016年06期

【摘要】：针对柴油机内部废气再循环(IEGR)量不易精确调整和控制的难题,提出一种利用进气门预开启(IVPO)凸轮控制IEGR率的方法。通过改变进气门预开启时刻、持续角及升程三个不同特征设计参数,实现IEGR率不同梯度改变,达到自主调控IEGR率的目的。以某六缸增压柴油机为研究对象,应用GT-Power仿真分析软件建立目标柴油机性能仿真分析模型,得到不同进气门预开启各特征参数对IEGR率及功率、转矩、燃油消耗率等发动机性能的影响规律。仿真结果表明:进气门升程是影响IEGR率的主要因素,当需对IEGR率进行较大幅度调整时,可考虑采用调节升程的方法;当进气门预开启升程大于2.6mm时,柴油机燃油消耗率增速加快,需在参数选择时权衡利弊。IVPO开启时刻与持续角对IEGR率的影响度较小,其中改变持续角对发动机经济性影响较小,当需小幅度调节IEGR率时,可优先考虑采用调整气门持续角的方法。经柴油机台架性能及排放试验结果证实,IVPO特征参数对IEGR率的控制规律与仿真结论相符。
[Abstract]:Aiming at the difficulty of accurate adjustment and control of the internal exhaust gas recirculation (IEGR) of diesel engine, a method for controlling the IEGR rate by using the inlet valve pre-opened cam is proposed. By changing the design parameters of inlet valve pre-opening time, persistence angle and lift, the gradient of IEGR rate can be changed and the IEGR rate can be adjusted autonomously. Taking a six cylinder turbocharged diesel engine as the research object, the performance simulation analysis model of the target diesel engine is established by using the GT-Power simulation analysis software. The IEGR rate, power and torque of different inlet valve pre-opening characteristic parameters are obtained. The influence law of engine performance such as fuel consumption rate. The simulation results show that the intake valve lift is the main factor affecting the IEGR rate, when the IEGR rate needs to be adjusted by a large margin, the method of adjusting the lift can be considered, and when the intake valve pre-opened lift is larger than 2.6mm, The increasing rate of diesel fuel consumption rate is accelerated, and it is necessary to weigh the advantages and disadvantages in the selection of parameters. The influence of opening time and duration angle on IEGR rate is small, and the change of sustained angle has little effect on engine economy, when the IEGR rate is adjusted by a small margin, Priority may be given to adjusting the valve persistence angle. The results of diesel engine bench performance and emission test show that the control law of the characteristic parameters for IEGR rate is consistent with the simulation results.
【作者单位】：上海理工大学机械工程学院;
【基金】：上海市自然科学基金项目(14ZR1428600)
【分类号】：TK421.5

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