浮臂式汽车油位传感器及其自动化检测系统设计

发布时间：2018-10-19 13:09

【摘要】：汽车技术的快速发展势必促进了汽车油位传感器技术革新。油位传感器不仅能准确感知汽车耗油量还能避免发动机在不良状态继续工作。当前汽车电子行业传感器检测精度低、使用寿命短、缺少系统设计规范、售后问题严重等现象频出,与此同时在这方面研究关注较少。因此,对浮臂式汽车油位传感器设计及全量程动态检测研究具有重要意义。本文对浮臂式汽车油位传感器与自动化检测系统的设计完成了以下一系列工作：1、结合传感器工作原理和厚膜电路生产工艺,提出厚膜电路设计规范。包含检测点位置、电极分布及间隙、电阻层高度、定位点及整个电路与基板边缘的设计要求。系统阐述厚膜电路串并联结构的设计及参数计算,完成金属触点材料及结构分析,改进设计。2、改进整套厚膜电路生产工艺。分析丝网印刷原理,印刷电子浆料成分,建立印刷理论模型和厚膜浆料沉积数学模型,从厚膜浆料配方及与汽油中硫化物反应速率研究来选取合适材料,保证传感器检测精度延长其使用寿命。同时对传感器电极电阻层烧结、激光校阻等生产工艺参数进行严格试验控制,确保成型后的传感器参数完全符合设计标准值。3、提出油位传感器全量程动态检测总体方案。全程微机控制检测降低人为误差,主要有系统硬件电路和软件驱动程序设计。系统硬件电路完成了传感器信号采集电路、数据处理、数据存储、液晶显示电路、系统电源电路、步进电机工作电路等设计。检测系统软件完成了信号采集模数转换、单片机数据处理、PC机串口通信、传感器数据存储显示等设计。4、传感器自动化检测上位机工作系统设计。由于不同型号传感器设计及检测参数不同,如检测点数目、标准设计值等。因此借助虚拟仪器技术开发上位机系统工作界面,将传感器所有检测参数及控制命令发送给单片机,同时接收下位机采集的数据并进行分析绘制曲线,给出测试结果。这种完全模拟实际行车过程中传感器状态的检测方法,检测精度高最具实际意义。本文从传感器厚膜电路设计、生产工艺参数及材料分析、自动化动态检测三方面展开研究。目的是提高传感器综合使用性能使其拥有较高的实用价值和经济效益。整个研制开发过程可为汽车油位传感器生产行业提供技术指导和理论基础。
[Abstract]:The rapid development of automobile technology is bound to promote the innovation of automobile oil level sensor technology. The oil level sensor can not only accurately sense the fuel consumption of the car but also prevent the engine from continuing to work in bad condition. At present, the detection precision of sensors in automobile electronics industry is low, the service life is short, the system design standard is lacking, the problems after sale are serious and so on. At the same time, little attention is paid to this aspect. Therefore, it is of great significance to the design of floating arm automobile oil level sensor and the research of full range dynamic detection. In this paper, the design of the floating arm automobile oil level sensor and automatic detection system has been completed as follows: 1. Combining with the working principle of the sensor and the production technology of thick film circuit, the design specification of thick film circuit is put forward. It includes the location of the detection point, electrode distribution and gap, resistance layer height, positioning point and the design requirements of the whole circuit and substrate edge. The design and parameter calculation of series-parallel structure of thick film circuit are described systematically, the metal contact material and structure analysis are completed, the design is improved, and the whole production process of thick film circuit is improved. This paper analyzes the principle of screen printing, the composition of printing electronic paste, establishes the printing theory model and mathematical model of thick film slurry deposition, and selects suitable materials from the formula of thick film slurry and the study of reaction rate between thick film slurry and sulfide in gasoline. Ensure the accuracy of sensor detection to prolong its service life. At the same time, the sensor electrode resistance layer sintering, laser resistor calibration and other production process parameters are strictly controlled to ensure that the parameters of the sensor after forming are in full compliance with the design standard value. 3. The overall scheme of full range dynamic detection of oil level sensor is put forward. The system hardware circuit and software driver are used to control and reduce the human error. The hardware circuit of the system has completed the design of sensor signal acquisition circuit, data processing, data storage, liquid crystal display circuit, system power circuit, step motor working circuit and so on. The software of the detection system has completed the design of signal acquisition A / D conversion, single chip microcomputer data processing, PC serial port communication, sensor data storage and display and so on. Because of different types of sensor design and detection parameters, such as the number of detection points, standard design values. Therefore, with the help of virtual instrument technology, the working interface of the upper computer system is developed, all the detection parameters and control commands of the sensor are sent to the single chip microcomputer, and the data collected by the lower computer are received and the curves are analyzed and drawn, and the test results are given. This method can completely simulate the sensor state in the actual driving process, and has the most practical significance with high detection precision. In this paper, the sensor thick film circuit design, production process parameters and material analysis, automatic dynamic detection of three aspects. The purpose of this paper is to improve the comprehensive performance of the sensor so that it has higher practical value and economic benefit. The whole research and development process can provide technical guidance and theoretical basis for automobile oil level sensor production industry.
【学位授予单位】：扬州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.6

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