通用型多工位尿素泵综合试验台开发及应用
发布时间：2018-07-28 08:04
【摘要】：随着社会经济的快速发展,近年来我国汽车保有量始终呈快速增长的趋势,随之而来的就是巨大的能源消耗以及环境问题。伴随着更加严格和全面的排放法律法规的出台,各发动机生产厂家均通过增加后处理系统的方式来降低柴油机的排放问题,而柴油机SCR后处理技术因其相关优势已经逐渐成为我国汽车厂家主选的后处理技术路线。在SCR后处理系统中,尿素泵是尿素溶液喷射计量系统的重要组成部分,其主要功能是抽取尿素箱内的尿素溶液,并保持一定的压力,然后输送到喷射单元,满足喷射计量系统对流量和压力的要求。因此尿素泵的可靠性对整个SCR后处理效果起着着至关重要的作用。在实车中,尿素计量泵分为气助式和非气助式两种,实际使用过程中,尿素泵故障率较高,因其使用环境存在差异,导致厂家对各泵之间一致性、劣化性无法判定。为此,本课题目的为设计并制造一套通用型多工位尿素泵综合试验台,并通过离线耐久试验的形式来考察尿素泵的可靠性能。首先,设计并搭建了通用型多工位尿素泵离线耐久试验台。根据试验台的多工位设计要求,以及离线耐久试验的特点(本实验台所喷射的尿素不需要在排气管内进行真实的反应),设计了可以有效优化试验台内部结构的横管竖井尿素箱结构以及可视化喷雾组件结构；同时通过对国内市场中柴油机厂家主要配套使用的尿素计量泵外形尺寸信息进行调研,设计了通用型安装工位,可装配不同厂家生产的泵；为了更真实的接近尿素泵的工作环境,实验过程中所用液体为尿素溶液,因此设计过程中进行了严格的密封性测试,以保证试验台能够在长时间进行耐久测试时正常工作；由于排气口汇混有尿素喷雾,设计了一款水过滤装置：试验台自身配备压缩机及气罐,同时也配有外接气源接口,方便在厂区实验室内进行试验时使用外接气源。其次,设计开发一款离线控制系统,可以直接通过向CAN总线发送报文的形式对尿素泵的喷射量进行控制,喷射量可为固定值,也可由一组数值组成,通过对大小循环的设定,可以整体控制耐久试验的时间；本系统可实现整体控制各待测泵也可实现单独控制各待测泵,并集成了实时数据记录保存功能；通过解析泵自身反馈的报文定义,可以实时的对每个泵的状态进行监控。此外,本系统还实现了一种上位机与多个具有相同地址CAN节点进行通信这一目标,解决一台电脑与多个具有相同地址的CAN节点的通信问题。最后对试验台进行功能测试,验证了试验台设计的合理性与可靠性。随后进行了1000小时尿素泵耐久试验,随机抽取三种品牌共10个泵(8气助式、2非气助式),分别对其进行编号,同时对各个待测泵进行手动精度测试并记录数据,1000小时耐久试验后,重新测试各待测泵的精度,根据实验前后的数据进行比对分析,对各泵之间的一致性、差异性以及劣化程度进行判定,得出相关结论。
[Abstract]:With the rapid development of the social economy, the car ownership in China has been increasing rapidly in recent years, which is followed by huge energy consumption and environmental problems. With the introduction of more stringent and comprehensive emission laws and regulations, all engine manufacturers have passed the way of increasing the post processing system to reduce diesel engines. In the post processing system of SCR, the urea pump is an important part of the urea solution injection metering system. The main function of the urea pump is to extract the urea solution of Sucane's urea and maintain a certain pressure in the post-processing system of the urea solution in the post processing system of the automobile manufacturers in China. Then it is transported to the injection unit to meet the requirements for the flow and pressure of the injection metering system. Therefore, the reliability of the urea pump plays a vital role in the treatment effect of the whole SCR. In the actual vehicle, the urea metering pump is divided into two kinds of gas and non gas assistance. In actual use, the urea pump has a higher failure rate and is stored in the environment. In this case, a universal multi position urea pump comprehensive test bed was designed and manufactured, and the reliability of the urea pump was investigated by off-line durability test. First, a universal multi position urea pump off-line durability test was designed and built. According to the design requirements of the test bench and the characteristics of the off-line durability test (the urea ejected in this experimental platform does not require real reaction in the exhaust pipe), the structure of the urea box in the horizontal pipe shaft and the structure of the visible spray component, which can effectively optimize the internal structure of the test rig, are designed, and at the same time, the domestic market is adopted. In order to get closer to the working environment of the urea pump, the liquid used in the process of the urea pump is a urea solution, so the strict sealing test is carried out in the design process. It is ensured that the test-bed can work normally for a long time. As the exhaust manifold is mixed with urea spray, a water filter is designed: the test bench is equipped with a compressor and a gas tank, and also equipped with an external gas source interface to facilitate the use of the external gas source in the laboratory test. Secondly, design and develop a model. The off-line control system can control the injection amount of the urea pump directly by sending messages to the CAN bus. The injection amount can be a fixed value, and it can also be composed of a set of values. Through the setting of the size circulation, the time of the endurance test can be controlled as a whole. The system can realize the overall control of each pending pump and can also be controlled alone. Each pump is to be measured and the real-time data record and storage function is integrated, and the state of each pump can be monitored in real time by analyzing the message definition of the feedback of the pump. In addition, the system also realizes the goal of communication between a host computer and multiple CAN nodes with the same address to solve a computer with the same address as many. The CAN node's communication problem. Finally, the test bench was tested to verify the rationality and reliability of the test bed design. Then the 1000 hour urea pump durability test was carried out, and three kinds of brands were randomly selected for 10 pumps (8 gas assistance, 2 non gas assistance), and their numbers were numbered respectively. At the same time, the manual precision test of each test pump was carried out. Record data, after 1000 hour endurance test, retest the precision of each test pump, compare and analyze the data before and after the experiment, determine the consistency, difference and deterioration degree between each pump, and draw the relevant conclusions.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ441.41
本文编号：2149445
[Abstract]:With the rapid development of the social economy, the car ownership in China has been increasing rapidly in recent years, which is followed by huge energy consumption and environmental problems. With the introduction of more stringent and comprehensive emission laws and regulations, all engine manufacturers have passed the way of increasing the post processing system to reduce diesel engines. In the post processing system of SCR, the urea pump is an important part of the urea solution injection metering system. The main function of the urea pump is to extract the urea solution of Sucane's urea and maintain a certain pressure in the post-processing system of the urea solution in the post processing system of the automobile manufacturers in China. Then it is transported to the injection unit to meet the requirements for the flow and pressure of the injection metering system. Therefore, the reliability of the urea pump plays a vital role in the treatment effect of the whole SCR. In the actual vehicle, the urea metering pump is divided into two kinds of gas and non gas assistance. In actual use, the urea pump has a higher failure rate and is stored in the environment. In this case, a universal multi position urea pump comprehensive test bed was designed and manufactured, and the reliability of the urea pump was investigated by off-line durability test. First, a universal multi position urea pump off-line durability test was designed and built. According to the design requirements of the test bench and the characteristics of the off-line durability test (the urea ejected in this experimental platform does not require real reaction in the exhaust pipe), the structure of the urea box in the horizontal pipe shaft and the structure of the visible spray component, which can effectively optimize the internal structure of the test rig, are designed, and at the same time, the domestic market is adopted. In order to get closer to the working environment of the urea pump, the liquid used in the process of the urea pump is a urea solution, so the strict sealing test is carried out in the design process. It is ensured that the test-bed can work normally for a long time. As the exhaust manifold is mixed with urea spray, a water filter is designed: the test bench is equipped with a compressor and a gas tank, and also equipped with an external gas source interface to facilitate the use of the external gas source in the laboratory test. Secondly, design and develop a model. The off-line control system can control the injection amount of the urea pump directly by sending messages to the CAN bus. The injection amount can be a fixed value, and it can also be composed of a set of values. Through the setting of the size circulation, the time of the endurance test can be controlled as a whole. The system can realize the overall control of each pending pump and can also be controlled alone. Each pump is to be measured and the real-time data record and storage function is integrated, and the state of each pump can be monitored in real time by analyzing the message definition of the feedback of the pump. In addition, the system also realizes the goal of communication between a host computer and multiple CAN nodes with the same address to solve a computer with the same address as many. The CAN node's communication problem. Finally, the test bench was tested to verify the rationality and reliability of the test bed design. Then the 1000 hour urea pump durability test was carried out, and three kinds of brands were randomly selected for 10 pumps (8 gas assistance, 2 non gas assistance), and their numbers were numbered respectively. At the same time, the manual precision test of each test pump was carried out. Record data, after 1000 hour endurance test, retest the precision of each test pump, compare and analyze the data before and after the experiment, determine the consistency, difference and deterioration degree between each pump, and draw the relevant conclusions.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ441.41
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