• CN:11-2187/TH
  • ISSN:0577-6686

›› 2014, Vol. 50 ›› Issue (16): 173-179.

• 论文 • 上一篇    下一篇

汽车超声波油耗测试主要影响因素

付百学;胡胜海   

  1. 黑龙江工程学院汽车与交通工程学院;哈尔滨工程大学机电工程学院
  • 发布日期:2014-08-20

Main Influencing Factors of Automobile Fuel Consumption Testing with Ultrasonic Technology

FU Baixue; HU Shenghai   

  1. School of Automotive and Transportation Engineering, Heilongjiang Institute of Technology; School of Mechanical and Electrical, Harbin University of Engineering
  • Published:2014-08-20

摘要: 结合汽车油耗测试技术的研发水平及发展趋势,采用超声波技术和单片机控制技术,进行汽车油耗测试技术研究。基于超声波时差法油耗测试理论,构建汽车油耗测试的数学计算模型。基于流体力学理论,采用流量修正系数对燃油流速进行修正。分析超声波流量传感器几何参数对汽车油耗测试的影响,采用三维坐标法可精确计算超声波流量传感器几何参数。分析环境温度对流量修正系数和超声波在燃油中传播速度的影响,提出修正措施。量化分析影响声时计算的噪声、测试阈值等参数,采用最大似然估计法消除同频噪声,合理选择测试阈值,仿真结果表明:汽车油耗声时测试精度可达到12 ns。综合考虑油耗测试的影响因素,采取修正措施,可优化汽车油耗测试的数学计算模型,提高汽车油耗测试精度,为研发汽车超声波油耗测试仪器奠定理论基础。

关键词: 汽车工程;油耗测试;影响因素;分析;超声波;时差法;测试精度

Abstract: Combining with the development level and development trend of automotive fuel consumption test technology, and adopting the ultrasonic technology and single-chip microcomputer control technology, a research was made on the automotive fuel consumption test technology. The mathematical calculation model of automobile fuel consumption test was established based on the fuel consumption test theory of ultrasonic time difference method. The fuel flow rate was modified by means of flow correction coefficient based on fluid mechanics theory. Analyzing the geometry parameters’ influence of the ultrasonic flow sensor on automobile fuel consumption test, and using the 3 d coordinate method, the ultrasonic flow sensor’s geometry parameters can be accurately calculated. By analyzing the environmental temperature’s influence on the flow rate correction coefficient and the propagation velocity of ultrasonic wave in the fuel, modification measures were put forward. Quantitatively analyzing the parameters of sound and threshold value which influence calculating ultrasonic transmission time, eliminating the frequency noise using the maximum likelihood estimation method, and reasonably choosing the threshold value, the simulation results showed that automobile fuel consumption testing accuracy was up to 12 ns. Comprehensively taking into account the influencing factors of fuel consumption test and taking corrective measures can optimize the mathematical calculation model of automobile fuel consumption test, and improve the automobile fuel consumption test accuracy. Thus, it will lay a theoretical foundation for the research and development of an ultrasonic automobile fuel consumption testing instrument.

Key words: automobile engineering;fuel consumption testing;influence factors;ultrasonic wave;time difference method;testing precision

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