发动机热膜式空气流量计设计与试验研究.docxVIP

DOI：10.3969/j.issn.1001-4551.2014.10.006发动机热膜式空气流量计设计与试验研究董良雄 1 DOI：10.3969/j.issn.1001-4551.2014.10.006 发动机热膜式空气流量计设计与试验研究 董良雄 1 ，肖金赫 2 ，朱发新 1 （1. 浙江海洋学院 港航学院，浙江 舟山 316022； 2. 中国船级社 武汉分社，湖北 武汉 430022） 摘要：针对目前国内船用双燃料发动机空气流量计设计较少以及模拟电路设计方案难以适用的问题，对流量计控制电路存在的缺 陷以及非线性误差进行了研究，设计了一种基于 MC9S08QD4 单片机的发动机热膜式空气流量计。在充分利用芯片内部的硬件资源 基础上，开发了热膜传感单元输出模拟信号采集、模/数转化以及流量信号输出控制等电路。同时，针对流量信号存在对环境温度交 叉敏感等问题，采取了基于查表的自动标定方法和基于多项式拟合的误差补偿方法。对该设计进行了与标准流量计的性能对比试 验和发动机不同工况下的性能对比试验。试验结果表明，该设计能有效减小的非线性误差影响以及减少工况变化对测量精度的影 响，有利于实现空气流量计的自动化和智能化。 关键词：空气流量计；非线性误差；自动标定；误差补偿 中图分类号：TH814；TP216； 文献标志码：A 文章编号：1001-4551（2014）10-1262-04 Design and experimental study of hot-film air flow meter on engine DONG Liang-xiong1，XIAO Jin-he2，ZHU Fa-xin1 （1. Maritime School of Zhejiang Ocean University，Zhoushan 316022，China； 2. Wuhan Branch of China Classification Society，Wuhan 430022，China） Abstract：Aiming at less original design and the problems that the analog circuit design are not applicable to hot- film air flow meter （AFM）of duel fuel marine engine in China. A kind of hot- film air flow meter based on MC9S08QD4 microcontroller was designed by studying the nonlinearity error of AFM and defects of analog circuit. On the basis of fully utilizing hardware resources，the microcontroller acts as the central controller and performs the signal processing and control of the meter. In allusion to the cross-sensitivity of ambient temperature，a error compensation method of air flow meter based on polynomial regression analysis was presented and automatic calibration based on Look- up Table for nonlinearity were introduced. The performance comparative tests were done within engine different working conditions. The test result indicate that the design can reduces nonlinearity error and the influence of the change of engine operation points，that is helpful to realize automation and intelligent of air flow meter. Key words：hot-film air flow meter（AFM）；nonlinearity error；automatic calibration；