设为首页加入收藏

《内燃机与动力装置》2020年第4期

作者:管理员  发布时间:2020-08-31   浏览次数:

空压机气缸体热-机耦合分析改进

马辉,张创科,孙俊花,于巍

瑞立美联制动技术(廊坊)有限公司,河北 廊坊 065000

摘要:建立空气压缩机装配的三维有限元模型,根据温度场的热边界计算公式和试验数据,对空压机的热边界条件参数进行修正,得到空气压缩机稳态工况下温度场的分布情况。采用多物理场耦合方法,计算气缸体在螺栓预紧力、温度和气体压力等工况下的变形情况。结果表明,缸盖螺栓预紧力和气体力对气缸体变形影响最大,在工作条件下,热负荷对气缸体变形影响较小。对气缸体结构进行改进,在45°、135°、225°和315°处各增加一条加强筋,使空气压缩机气缸体的变形量平均减小了约45%,为减小气缸体变形,提高气缸体刚度提供了理论参考。

关键词:空压机;气缸体;热变形

Thermal-mechanical coupling analysis and improvement of air compressor cylinder block

MA Hui, ZHANG Chuangke, SUN Junhua,YU Wei

Ruili Meilian Air Compressor Management Systems (Langfang) Co., Ltd., Langfang 065000, China

Abstract: The finite element model of Air compressor assembly was established. According to the thermal boundary formula and test data of the temperature field, the thermal boundary parameters of the Air compressor are corrected to obtain the distribution of the temperature field under steady state in the working process. The multi-field coupling method is used to calculate the deformation of the cylinder under the condition of bolt pre-tension, temperature and pressure. The results indicated that cylinder head bolt pre-tension and gas pressure has the greatest influence on the deformation of the cylinder. By optimizing and improving the cylinder block structure, the deformation of cylinder block is reduced by about 45%, the results show that the improvement is effective, and also provide a theoretical reference for reducing the deformation and increasing the strength of cylinder block.

Key words: air compressor; cylinder block; thermal deformation

 

天然气发动机EGR系统应用研究

张腾1,韩文涛2*,田占勇2,王林波2,安宁2,姚旺2

1.潍柴西港新能源动力有限公司,山东潍坊261061;2.潍柴动力股份有限公司,山东潍坊261061

摘要:研究进气流量传感器和废气文丘里流量计两种不同技术方案对废气再循环(exhaust gas recirculation,EGR)率控制精度的影响,并在采用理论空燃比的天然气发动机上进行试验验证。结果表明:基于废气流量计计算的发动机再循环废气量精度更高,低速工况时相对误差小于4.27%,高速工况时相对误差小于0.35%;通过发动机台架EGR率测试,EGR率的相对误差小于2.64%,在可控范围内,且采用闭环控制策略,可保证EGR系统精准可靠地运行。

关键词:EGR系统;废气流量;EGR率;控制策略

Study on application oftheEGR system used by natural gas engine

ZHANG Teng1,HANWentao2,TIANZhanyong2,WANGLinbo2,AN Ning2,Yao Wang2

1.Weichai Westport Co.,Ltd., Weifang261061,China;2.Weichai Power Co.,Ltd.,Weifang261061, China

Abstract:In order to explore the influence of two different technical schemes of intake flow sensor and exhaust venturi flowmeter on the accuracy of EGR rate, the stoichiometric natural gas engine was analyzed.The research shows that the accuracy of the recirculated exhaust gas volume calculated based on the exhaust air venturi method is more accurate.The error of the recirculated exhaust gas volume of the engine is 4.27% at low speed and within 0.35% at high-speed conditions.Through the engine dyno, the EGR rate error is within 2.64 that is in the controllable.In addition, the EGR system adopted closed-loop control strategy can makethe operation ofEGR system more accurate, reliable and stable.

Keywords:EGR system; exhaust gas flow;EGR rate; control strategy

 

气缸盖铸造工艺孔密封方案的研究与应用

田身军,李德银,项大伟,齐少虎,张镇,昂亮

奇瑞汽车股份有限公司 动力系统技术中心,安徽 芜湖 241009

摘要:为解决集成排气歧管缸盖铸造工艺孔密封问题,在对密封孔应用环境研究的基础上,对比钢球、拉涨式堵头、丝堵、碗形塞等不同密封方案,从成本角度选取碗形塞密封;采用冲出压强对比试验,识别出影响碗形塞密封效果的关键因子并确定碗形塞的最优方案:材料为S304、过盈量为0.167~0.272 mm、压入深度应为2.5~3.5 mm,密封胶品为T48。基于多轮发动机台架和整车道路试验验证,碗形塞密封方案完全可以应用于高性能发动机缸盖水套、油道等处的密封。

关键词:发动机;集成排气歧管;缸盖;水套;碗形塞

Research and application of sealing scheme for

casting process hole of cylinder head

TIAN Shenjun, LI Deyin, XIANG Dawei, QI Shaohu, ZHANG Zhen, ANG Liang

Chery Automobile Co., Ltd., Wuhu 241009, China

Abstract: In order to solve the problem of hole sealing in cylinder head casting process. This thesis studied the application of sealing hole and the related environment. Comparing different sealing plan from steel ball, tension plug, screw plug and sealing cap, we select the sealing cap from the perspective of cost. By adopting the Impulse strength contrast test, we recognize the key factors which affects the sealing of the sealing cap and determine the optimized plan. Based on the several round test of engine bench and vehicle road test, the sealing cap plan can be applied to the sealing of high performance engine cylinder head water jacket and oil channel.

Key words: engine; integrated exhaust manifold;cylinder head; water jacket; sealing cap

 

基于前后氧信号响应劣化补偿的三元催化器诊断

钟建伟,吴兴龙

泛亚汽车技术中心有限公司,上海  201201

摘要:分析氧传感器劣化失效对三元催化器诊断的影响,发现前氧信号响应劣化导致三元催化器诊断计算的储氧时间变小,趋向于误判正常三元催化器为故障;后氧信号响应劣化导致三元催化器诊断计算的储氧时间变大,趋向将实际存在故障的三元催化器误判为正常。设计基于氧传感器劣化的三元催化器诊断策略,引入前、后氧补偿值对实测储氧时间进行修正。试验表明,该策略可实现前后氧传感器劣化的偏差补偿,提高了对三元催化器诊断的精确性。

关键词:氧传感器劣化;三元催化器诊断;氧传感器响应

Study for catalyst diagnosis based on O2 sensor compensation

ZHONG Jianwei, WU Xinglong

Pan Asia Technical Automotive Center Co. Ltd, Shanghai 201201, China

Abstract: The effect of O2 sensor degradation on the diagnosis of TWC is analyzed. It is found that the degradation of pre O2 sensor leads to the decrease of oxygen storage time of TWC, which tends to misjudge the normal TWC as fault; the deterioration of post O2 sensor leads to the increase of oxygen storage time of TWC, which tends to misjudge the actual fault TWC as normal. The diagnosis strategy of TWC based on the deterioration of O2 sensor was designed, and the measured O2 storage time was corrected by introducing the pre and post O2 compensation values. Experimental results show that the strategy can realize the deviation compensation of the deterioration of the pre and post O2 sensors, and improve the accuracy of the TWC diagnosis.

Key words: O2 sensor degradation; TWC diagnostic; O2 response

 

非道路国四阶段柴油机机内净化试验研究

赵联海1,2,史彦晓1,2

1.内燃机可靠性国家重点实验室,山东 潍坊 261061;2.潍柴动力股份有限公司,山东 潍坊 261061

摘要:为降低NOx、烟度和PM的排放,秉持设计、仿真、试验一体化的理念,基于PM生成机理,采用EGR路线对配套非道路四阶段挖掘机的发动机进行优化。在合理的试验设计基础上,结合实际路制定谱控制策略制,围绕进气均匀性、预喷量、 喷油锥角等进行试验及仿真,提出减少进气管壁凹坑、使用厚度为1.0 mm的喷油器垫片、减小EGR阀开度闭环控制的前馈开度等优化措施,有效降低挖掘机尾气排放。

关键词:柴油机;仿真;高轨压;EGR

Experimental research on China non-road stage iv engine internal purification

ZHAO Lianhai1,2, SHI Yanxiao1,2

1.State Key Laboratory of Engine Reliability, Weifang 261061 , China; 2.Weichai Power Co., Ltd., Weifang 261061, China

Abstract: In order to reduce the emissions of NOx, soot and PM, the engine of the four stage off road excavator was optimized by adopting EGR route based on the PM generation mechanism and adhering to the concept of integration of design, simulation and test. On the basis of design of experiment, combined with the actual road, the spectrum control strategy system is formulated, and the test and simulation are carried out around the intake uniformity, pre injection volume and injection cone angle. The optimization measures such as reducing the intake pipe wall pit, using injector gasket with thickness of 1.0 mm, and reducing the feed-forward opening of EGR valve closed-loop control are proposed to effectively reduce the exhaust emission of excavator.

Key words: diesel engine; simulation; high rail pressure; EGR

 

 

  • 附件【2020年第4期.pdf】已下载

通信地址:济南市长清大学科技园海棠路5001号 邮编:250357
《山东交通学院学报》编辑部电话:0531-80687340
《内燃机与动力装置》编辑部电话:0531-80687025
山东交通学院学报编辑部版权所有 网站浏览次数: