共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
3.
(接上期)在装配喷油器之前,应首先清洁汽缸盖中喷油器的安装座面,若上面有零散的颗粒,要使用抽吸装置或者类似工具将其吸出,然后将一个新的热密封垫圈套在喷油嘴上。若是新的喷油器,还必须将喷油器上的C2I码输入到发动机的电控单元,如果换用已用过的喷油器或者不记得喷油器的安装位置,也应这样做。紧接着,将喷油器插入汽缸盖中,并用固定压板压紧,紧固螺母的拧紧力矩为28Nm。然后按照前面说明的方法装上高压油管,并重新插上电插头。 相似文献
4.
5.
6.
喷油器密封性的就车检查方法①用干净的透明玻璃杯盛装柴油。②将喷油泵一端的高压油管卸下,并插入油杯中。③用起动机带动发动机旋转,并观察油杯中有无气泡。若有气泡,说明该缸的喷油器针阀密封性差,应拆下喷油器的针阀偶件进行研磨处理, 相似文献
7.
喷油器安装角度对缸内直喷汽油机混合气的影响 总被引:1,自引:0,他引:1
以侧置喷油器的缸内直喷汽油机为对象,采用数值计算分析方法对混合气形成过程和喷油器安装角度对缸内混合气形成的影响进行了分析.结果表明,缸内气体流动对燃油喷束形态影响很大;转速不同时,缸内混合气形成过程差异较大;点火时刻的缸内混合气成分对喷油器安装角度较为敏感,可以通过改变喷油器安装角度在一定程度上优化缸内混合气的成分. 相似文献
8.
为了确定不同结构参数对喷油器静态流量的影响,运用GT-Fuel仿真软件建立汽油机喷油器模型,分析关键参数喷孔长径比、喷油器针阀开启高度、喷孔孔径对喷油器静态流量的影响,采用DOE方法对结构参数进行优化,并利用现有的试验以及测量条件,对所制作样件进行试验研究。 相似文献
9.
10.
从维修角度出发,针对常见的喷油器堵塞及泄漏故障,采用3种不同的测试方法,对喷油器进行免拆检测与分析,从而提高喷油器故障检测效率。 相似文献
11.
共轨喷油器在车喷油量控制自学习方法 总被引:1,自引:0,他引:1
为了精确控制喷油器老化后的在车喷油量,分析了共轨喷油器老化试验前后的小油量喷射特性,提出了小油量自学习修正的方法。当发动机处于倒拖工况时,在不同的轨压下,通过主动小脉宽喷射测得特定缸角加速度与其他几缸角加速度平均值的比值,研究得到发动机小油量燃烧后角加速度变化规律,并据此设计喷油量控制自学习算法。实车试验与台架试验表明,在无需增加额外传感器的情况下,小油量自学习修正算法能精确控制老化喷油器的小油量,明显改善老化喷油器小油量喷射的一致性和稳定性,满足发动机在全寿命期间的性能要求。 相似文献
12.
为了得到电控喷油器针阀开启滞后时间(td1)及针阀落座滞后时间(td2),从电控喷油器的结构和工作原理出发,分析了电控喷油器的喷射过程,详细推导了喷油器针阀开启及落座滞后时间的数学表达式,为电控喷油器的性能改进提供了理论指导;详细分析了电控喷油器通电后线圈电流的变化规律,利用在喷油器针阀完全开启或完全落座时刻,电流曲线上会出现拐点的特点,设计了测试拐点出现时刻的检测电路,并利用80C196单片机开发了电控喷油器开启及落座滞后时间测试系统。实际测试结果表明,该测试系统对td1的测试误差为0.87%,对td2的测试误差为1.14%,可以满足电控喷油器开发过程中动态性能检测的需要。 相似文献
13.
14.
15.
Riccardo Amirante Carlo Coratella Elia Distaso Gianluca Rossini Paolo Tamburrano 《International Journal of Automotive Technology》2017,18(4):729-742
Since the needle displacement exerts a fundamental influence on the operation of Common Rail injection systems, accurate measurements of the control piston position can be crucial for a more thorough analysis of the behaviour of injectors, in particular when multiple injections are employed. Eddy current sensors have traditionally been used in lab activities to measure the control piston position inside injectors; apart from the high cost, the scientific literature clearly shows their inadequacy, which is mainly due to the presence of electromagnetic disturbance: the current pulse, which controls the opening of the injector, generates electromagnetic fields which strongly affect the acquisition of data. Many attempts have recently been made either to solve the interference occurring during such measurements or to propose alternative displacement transducers whose operation is not influenced by electromagnetic interference. In this paper, a new device for measuring the injector opening is proposed: it is an optical transducer characterized both by simple and very cheap construction and by a reliable physical principle for measuring the control piston lift. The reliability of the proposed sensor is assessed by a thorough experimental campaign and by comparing the experimental results with the numerical predictions achieved by a Common Rail injector model. Since the assembly of the optical sensor does not affect the injector operation, it can efficiently be used both for experimental tests and for on-board diagnosis and monitoring of the injector operation. 相似文献
16.
We investigated the effects of injection parameters such as injection pressure, ambient pressure, and ambient temperature
on spray characteristics. We calculated the turbulence occurring point (t
c
), defined as the time required to generate a vortex, and the deceleration point (t
b
), defined as the time when spray penetration begins to decelerate, to elucidate the breakup mechanism of the test injectors.
The spray velocity coefficient (Cv) was obtained to evaluate the spray characteristics. As the ambient pressure increases in the case of a slit injector, Cv decreases. We investigated the effects of nozzle tip shape according to injection pressure, ambient pressure, and fuel properties
on spray characteristics and provide a Cv value of 0.38 for the swirl injector with a spray angle of 60° and the slit injector under atmospheric conditions. The value
of Cv in the case of a slit injector was reduced by increasing the ambient pressure. Our results suggest that Cv of a swirl injector is constant regardless of changes in ambient pressure, injection pressure, and fuel properties. On the
other hand, Cv of a slit injector is altered by changes in ambient pressure. 相似文献
17.
18.
驱动参数对GDI压电喷油器特性影响的试验研究 总被引:1,自引:0,他引:1
在油泵试验台上采用不同驱动方式对汽油机缸内直喷(GDI)压电喷油器的流量特性和响应特性进行了研究,测量了喷油器的喷油量、针阀开启时间等参数随驱动电压、电流的变化规律.研究表明:采用单峰值和恒定电流驱动方式,随着驱动电压的增大,喷油量近似呈线性增加,当电压大于155 V时,喷油量保持不变;采用多峰值电流驱动,随着驱动电压的增大,喷油量不断增大.采用恒定电流和多峰值电流驱动时,驱动电流对喷油量的变化影响不大.相同电流时,多峰值电流驱动的喷油量小于恒定电流驱动的喷油量.压电喷油器的响应时间随着驱动电压、驱动电流和电流变化率的增加逐渐减少,并最终趋于稳定. 相似文献
19.
喷嘴孔数及其布置对汽油直喷喷嘴闪沸喷雾-环境气体相互作用影响的研究 总被引:1,自引:0,他引:1
为了区分火花塞点火式缸内直喷(SIDI)发动机喷雾和环境气体两相流场,将优化后的高速双色PIV(Particle Image Velocimetry)技术应用于多孔直喷喷油器的喷雾和环境气体速度的测试.此双色PIV系统由一个特殊的示踪和滤波系统组成,可同时对燃油喷雾及其环境气体的速度场进行测量.本研究采用该双色PIV方法研究不同环境压力和燃油温度的条件下,喷嘴孔数及其布置情况对燃油喷雾和环境气体的相互作用的影响.在此研究中,对3个汽油直喷喷嘴做了详细的研究,包括1个6孔喷嘴,1个3孔喷嘴及1个2孔喷嘴.研究结果表明,随着燃油温度的提高或者环境气体压力的降低,喷雾雾化增强,燃油颗粒粒径减小,导致喷雾油束变宽,喷雾与环境气体接触面积变大,喷雾和环境气体的两相流场的作用变强.不同孔数和布置的喷油器在冷态及闪沸条件下油束间干扰作用的强度不同,导致喷雾传递给环境气体的动能不同.较强的油束间的干扰作用加强了燃油喷雾与环境气体之间的动量交换过程,进而增强了环境气体的动能. 相似文献