电动汽油泵中单向阀作用是什么.docx

1、电动汽油泵中单向阀作用是什么电动汽油泵中单向阀作用是什么科普知识 电动汽油泵中单向阀作用是什么? 燃油泵的附加功能由安全阀和单向阀完成。安全阀可以避免燃油管路阻塞时压力过分升高，而造成油管破裂或燃油泵损伤现象发生。单向阀设置目的，是为了在燃油泵停止工作时密封油路，使燃油系统保持一定残压，以便发动机下次起动容易 电动燃油泵原理及其故障的判定方法 电动燃油泵 燃油泵主要由泵体、永磁电动机和外壳三个部分组成. 工作原理为:永磁电动机通电后带动泵体旋转将燃油从进油器吸入，流经电动燃油泵的内部，再从出油口压出，给燃油系统供油, 电动燃油泵的外壳两端卷边铆紧，使各个部件组成一个不可拆卸的总成，因此电动燃油

2、泵一般不修理。燃油泵的附加功能由安全阀和单向阀完成，安全阀的作用是避免燃油管路阻塞时，压力过分升高造成油管破裂或损伤燃油泵的现象发生。安全阀的标定压力为2.6 bar，单向阀的设置是为了防止在燃油泵停止工作时密封油路，使燃油系统保持一定的残压，以便发动机下次起动时容易。 电动燃油泵安装在整车的油箱内的底壳上，油箱的底壳office, branch offices (jurisdiction), risk management, marketing management sector through supervision and inspection found problems, shoul

3、d be assigned the investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, then the relevant provisions to punish the investigators, according to the Bank. To constitute a crime shall be investigated for criminal responsibility: (A) on the busin

4、ess that are not involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii) to participate in credit customer survey is not in place, customers and data is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not

5、 provide for due diligence of credit business, pre-loan investigation form, concealing facts or providing false information or should be found in a normal investigation failed to discover the risk factors, lead to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey

6、not in place, not by provides on arrived, and pledge real for field verification, and assessment, and identification and registration, not according to provides on guarantor of guarantees qualification and guarantees capacity for survey verified, led to guarantees loan lost authenticity, and legitim

7、acy, and effectiveness of; cycle loan business in the of mortgage 上有局部下陷构成的油池。油泵工作时从油池中吸油，出油口经过输油管穿过油箱盖与外部供油管路连接。 油泵的上部由油箱盖和油箱盖垫片，将油泵紧紧地压在油箱内。在油泵上有出油、回油标计箭头，可按该箭头确定管路的连结。 油泵电路的连结: 油泵电路有5路连接口，其中2路为油泵的电源，另3路为液面显示。电源电路中红色为“+”极，该极应接在电喷系统线束的接口上，该电源由ECU控制的继电器控制。 燃油泵提供的燃油流量为80L/小时，多余的油再循环，流入燃油箱内，燃油在循环过程中冲洗

8、和冷却喷油咀体。 电动燃油泵的好坏判断: a. 电动燃油泵损坏前，其噪声比正常时间有明显的增大，通过听声音就能判断出来。 b. 检测电动燃油泵电枢绕阻的电阻，一般电阻在10,20左右，若阻值过大或过小，说明电动燃油泵电枢绕阻有短路，电刷接触不良或绕阻断路等故障。 c. 检查电动燃油泵的输油量:拆下电动燃油泵的出油管，将电动燃油泵的接线柱通11.5V以上的电压，用量杯从出油口收集燃油，30秒种内泵油量应不少于0.6升，否则说明泵体为安全阀有故障。 电动燃油泵为不可修复件，当判定为损坏时，必须更换 office, branch offices (jurisdiction), risk manage

9、ment, marketing management sector through supervision and inspection found problems, should be assigned the investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, then the relevant provisions to punish the investigators, according to the Bank.

10、 To constitute a crime shall be investigated for criminal responsibility: (A) on the business that are not involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii) to participate in credit customer survey is not in place, customers and data

11、 is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not provide for due diligence of credit business, pre-loan investigation form, concealing facts or providing false information or should be found in a normal investigation failed to discover the risk factors, lead

12、 to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey not in place, not by provides on arrived, and pledge real for field verification, and assessment, and identification and registration, not according to provides on guarantor of guarantees qualification and guar

13、antees capacity for survey verified, led to guarantees loan lost authenticity, and legitimacy, and effectiveness of; cycle loan business in the of mortgage 电动燃油泵的拆卸及安装时，必需须切断总电源。 电脑控制燃油泵的特点 当燃油泵接通后，将点火开关接到?档位置时，油泵开始供油，如果在10秒钟之内ECU收到发动机的转速信号是低于最小起始转速或发动机停机时，油泵电源就被切断，目的是防止油泵长期工作、并为出现意外情况时切断油路。 当发动机运转或

14、起动功况下，油泵电源是接通的。 office, branch offices (jurisdiction), risk management, marketing management sector through supervision and inspection found pr第 3 页 共 8 页 oblems, should be assigned the investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, th

15、en the relevant provisions to punish the investigators, according to the Bank. To constitute a crime shall be investigated for criminal responsibility: (A) on the business that are not involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii

16、) to participate in credit customer survey is not in place, customers and data is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not provide for due diligence of credit business, pre-loan investigation form, concealing facts or providing false information or shoul

17、d be found in a normal investigation failed to discover the risk factors, lead to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey not in place, not by provides on arrived, and pledge real for field verification, and assessment, and identification and registratio

18、n, not according to provides on guarantor of guarantees qualification and guarantees capacity for survey verified, led to guarantees loan lost authenticity, and legitimacy, and effectiveness of; cycle loan business in the of mortgageMPI的结构特点 MPI系统由燃料供给系统(电动汽油泵、燃油滤清器、分配管、压力调节器、喷油器和冷起动阀等)、空气供给系统(空气滤清器

19、、空气流量计、进气系统等)以及电子控制系统(电子控制单元ECU、传感器)等组成。图13为德国博世(Bosch)公司研制生产的MPI系统。 工作原理由空气流量计检测发动机的进气量，由发动机转速及曲轴位置传感器提供发动机转速信号和曲轴转角信号，电子控制单元根据发动机运行工况，从存储单元的数据中查出相对应工况下的最佳空燃化，依据进气量利转速及曲轴转角信号计算出每循环的供油量，实现对喷油器的喷油量的控制，同时通过节气门位置、冷却水温、空气温度和氧含量等传感器检测到的反映发动机运行工况的表征信号，对喷油量、喷油时间进行修正，从而使发动机始终具有一个最佳的空燃比。 实现发动机性能的优化平衡 在以往的汽油发

20、动机中，可燃混合气是由化油器提供的，即汽油由化油器喷管喷出即被流经喉管的高速的空气流冲散，成为雾状颗粒，与空气混合，经过气管被分配到各个气缸。在这里，空气流量取决于喉管的形状和尺寸;汽油流量，对于一定结构参数的化油器，则取决于喉管的真空度。 由于汽油发动机的工作特点是工况变化范围大:负荷从office, branch offices (jurisdiction), risk management, marketing management sector through supervision and inspection found problems, should be assigned t

21、he investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, then the relevant provisions to punish the investigators, according to the Bank. To constitute a crime shall be investigated for criminal responsibility: (A) on the business that are no

22、t involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii) to participate in credit customer survey is not in place, customers and data is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not provide for du

23、e diligence of credit business, pre-loan investigation form, concealing facts or providing false information or should be found in a normal investigation failed to discover the risk factors, lead to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey not in place, n

24、ot by provides on arrived, and pledge real for field verification, and assessment, and identification and registration, not according to provides on guarantor of guarantees qualification and guarantees capacity for survey verified, led to guarantees loan lost authenticity, and legitimacy, and effect

25、iveness of; cycle loan business in the of mortgage O一100%，转速从最低稳定转速到最高转速，而且有时工况变化很迅速。而各种工况对混合气的浓度要求不同。为了保证可燃混合气的浓度符合预定数值，就需要精确地控制空气流量和汽油流量。传统的化油器供给系统是通过主供油装置及一些辅助供油装置来实现控制，与电子燃油喷射系统相比，不仅结构复杂，而且对发动机运行状态的适应性、响应速度和控制的精确性均显不足，尤其在特殊工况(加速、冷起动)，难于在满足车辆的动力性能的同时，兼顾经济性和排放控制。 而MPl系统可以根据发动机的进气量大小和运行工况，对混合气浓度进行自

26、动控制。通过提供发动机各种工况下实际需要的最佳空燃比，使汽车的动力性能增强，油耗和排放物获得良好的控制。 技术特点:充气系数nv Nv值越大，显示每循环实际克气虽越多，发动机功率和扭矩则随每循环可燃烧的燃料的增多而提高。由于Nv值正比于进气终了的压力，因此利用进气管内气流的波动特性，形成进气增压效果，是提高nv值的有效途径。由于电子燃油喷射系统用直接喷油取代了化油器，进气系统的设计无需考虑预热装置和喉管阻力等因素，从而为达成这一途径，优化进气管结构提供了设计空间。 目前在实际应用中，有按特定转速区域，利用进气时的office, branch offices (jurisdiction), ri

27、sk management, marketing management sector through supervision and inspection found pr第 5 页 共 8 页 oblems, should be assigned the investigators are corrected in a timely manner. 27th the fifth chapter penalty under any of the following acts, then the relevant provisions to punish the investigators, a

28、ccording to the Bank. To constitute a crime shall be investigated for criminal responsibility: (A) on the business that are not involved in the investigation, issued a survey. (B) customer credit information are not thorough verification. (Iii) to participate in credit customer survey is not in plac

29、e, customers and data is incomplete, untrue; he knows bear a counterfeited clients issuing credit. (D) does not provide for due diligence of credit business, pre-loan investigation form, concealing facts or providing false information or should be found in a normal investigation failed to discover t

30、he risk factors, lead to the review and approval policy errors, loan risk. (Five) on loan guarantees of survey not in place, not by provides on arrived, and pledge real for field verification, and assessment, and identification and registration, not according to provides on guarantor of guarantees q

31、ualification and guarantees capacity for survey verified, led to guarantees loan lost authenticity, and legitimacy, and effectiveness of; cycle loan business in the of mortgage惯性效应和脉动效应设计的具有特定长度的进气管，也有管内设置进气增压阀的可变长度进气管。实践证明，这些结构极大地改善了充气性能，提高了发动机的动力性，降低了油耗。 雾化质量高并实现了可燃混合气的均等分配 可燃混合气及时并燃烧完全的条件是:汽油与空气以

32、一定的重量比例混合;汽油在空气中彻底雾化并与空气均匀混合，以便在点火之前各缸的混合气成分接近相等并接近完全汽化。在这一方面，化油器是利用吸入的气流的动能实现汽油的雾化，采用化油器的直列多缸发动机通常是两缸或部分气缸共用一个进气道。 与化油器不同，为了加快蒸发速度，MPl系统的喷油器以200一300kpa的压力，将汽油从喷孔喷出，在空气阻力和高速流动的扰动下，汽油被击碎成雾状，从而大大增加了与空气的接触面积，提高了雾化的细度和均匀度，这对改善发动机的冷起动性能，尤为重要。 其次，采用MPl系统后，每个气缸相对于一个单独的进气管，每个气缸盖安装一个电磁喷油器直接将燃油到进气适内进气门上方，与流经进

33、气歧管的空气流混合，当进气门打开时，被吸入气缸。这种与系统相匹配的进气管的布置型式，充分实现了新鲜充气量数虽和成份在各气缸的均匀分配。与化油器式进气系统相比，不仅构简化，而且从根本上解决了office, branch offices (jurisdiction), risk management, marketing management sector through supervision and inspection found problems, should be assigned the investigators are corrected in a timely manner. 27t