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油泵试验测控系统设计
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摘要
油泵试验测控系统是基于软、硬件技术的运用,设计一种适用于变工况电控油泵(单体泵)试验的自动化测控系统。该系统具有集成度高、方便、易用等特点。设计工作主要包括两个方面,一方面在当前油泵试验台的技术环境条件下,开发硬件辅助设备模拟真实发动机运行环境的输出信号,以满足电控油泵试验的需求。另一方面则是设计、集成试验测控设备的上位机程序,开发自动测控的应用软件。
     本论文对油泵试验测控系统的系统结构、组成原理、设计过程进行介绍。在油泵试验测控系统设计中,参考喷油泵试验测控的行业论文和清华、电子科大等高校部分技术资料,结合威特公司的电控单体泵的试验、生产经验,对试验台进行技术改造,提出硬件采用单片机、可编程逻辑器件CPLD设计信号变换模块,将机械试验台信号盘输出360脉冲/圈的转速脉冲信号进行分频处理,模拟出发动机工作的凸轮、曲轴脉冲信号,以满足电子控制单元(ECU)的信号输入需求。软件设计上采用VC++、C#等语言,VC6.0,VS.NET等开发工具将测控所需的CAN、RS232、USB、TCP通信协议模块化集成,充分利用多线程技术、库文件封装技术将各类试验设备的测控模块集成在本系统当中。此外还运用NI Measurement Studio等第三方控件将各类测控仪器的控制接口集成在一个界面上,对一些需要在线监控的数据在软件界面上予以生动、形象地显示。最后根据威特公司的试验、生产流程的需要设计定时测控、预约数据采集、工况自动切换、油量修正码自动计算、产品合格自动甄别等工业自动化测控功能。油泵测控系统简化了油泵试验繁杂的操作步骤,操作人员只需要输入一张工况表,测控系统则能自动完成油泵试验,存储试验数据,筛选合格油泵等工作。
     经过油泵试验测控系统在威特公司产品小批量生产的应用,测控系统的精确性、系统运行可靠性得以验证,满足了油泵试验的需求,符合油泵产品性能试验流程,极大的提高了油泵试验的效率,完全杜绝了人工测控的测量误差,规范了油泵试验测控的严密性。未来,油泵试验测控系统的各类模块还可作相应更改以适应于电喷系统开发需求的不断变化。
The Pump test control system is based on hardware and software technical using, which design an Electronic-controlled engine pump test control automatic system applying to mutative operating condition. The system is characterized by a variety of communication protocols module, high integration, convenience and easy use. The design work mainly contains two parts. On the one part, we develop hardware accessories and simulate the output signal of the real engine operating environment to meet the demand for electronically controlled pump test, in the current technological conditions of pump test-bed. The other part is to design application software of test equipments.
     The thesis introduced system environment and design principles of the pump test control system. Consulting industry articles of injection pump control and technical data of Tsinghua University, UESTC etc., combining electronic injection products R&D and production experience of WIT Co., Ltd, control system design transformed test-bed, proposed hardware using microcomputer and programmable logic device COLD design signal processing module, distinguished frequency of mechanical test-bed output 360r.p.m pulse signal and simulated cam and crank pulse signal during engine working, in order to meet the demand of Electrically Controlled Unit (ECU) signal input. PC software adopts VC++ and C# language. Development tools like VC6.0, VS.NET etc. will monitor the required CAN, RS232, USB, TCP communication protocol to develop modular, which can be integrated into the system by making full use of multi-threading technology and library packaging technology. In addition, NI Measurement Studio control is used to integrate various controlling interfaces of monitoring equipment into an interface and display some data which need on-line monitoring vividly in the software interface. Finally, according to monitor function of industrial automation of WIT Co., Ltd, including testing, production process development condition input, timing, booking data, switching bench speed automatically, calculating the fuel correction code automatically, discriminating qualified products automatically etc. , we can use database technology to manage the acquired data effectively.
     Through pump test control system applying to small batch production of WIT Co., Ltd, the accuracy of system control and the reliability of system are verified, meeting the demand of pump test, conforming to pump products performance test process, improving the efficiency of pump test greatly, standardizing the tightness of the pump test DAQ. In the future, various modules of pump test control can also be modified correspondingly to adapt to continuous changes of test development needs of EFI products.
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