机械工程学报
機械工程學報
궤계공정학보
CHINESE JOURNAL OF MECHANICAL ENGINEERING
2014年
16期
173-179
,共7页
汽车工程%油耗测试%影响因素%超声波%时差法%测试精度
汽車工程%油耗測試%影響因素%超聲波%時差法%測試精度
기차공정%유모측시%영향인소%초성파%시차법%측시정도
automobile engineering%fuel consumption testing%influence factors%ultrasonic wave%time difference method%testing precision
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。
結閤汽車油耗測試技術的研髮水平及髮展趨勢，採用超聲波技術和單片機控製技術，進行汽車油耗測試技術研究。基于超聲波時差法油耗測試理論，構建汽車油耗測試的數學計算模型。基于流體力學理論，採用流量脩正繫數對燃油流速進行脩正。分析超聲波流量傳感器幾何參數對汽車油耗測試的影響，採用三維坐標法可精確計算超聲波流量傳感器幾何參數。分析環境溫度對流量脩正繫數和超聲波在燃油中傳播速度的影響，提齣脩正措施。量化分析影響聲時計算的譟聲、測試閾值等參數，採用最大似然估計法消除同頻譟聲，閤理選擇測試閾值，倣真結果錶明：汽車油耗聲時測試精度可達到12 ns。綜閤攷慮油耗測試的影響因素，採取脩正措施，可優化汽車油耗測試的數學計算模型，提高汽車油耗測試精度，為研髮汽車超聲波油耗測試儀器奠定理論基礎。
결합기차유모측시기술적연발수평급발전추세，채용초성파기술화단편궤공제기술，진행기차유모측시기술연구。기우초성파시차법유모측시이론，구건기차유모측시적수학계산모형。기우류체역학이론，채용류량수정계수대연유류속진행수정。분석초성파류량전감기궤하삼수대기차유모측시적영향，채용삼유좌표법가정학계산초성파류량전감기궤하삼수。분석배경온도대류량수정계수화초성파재연유중전파속도적영향，제출수정조시。양화분석영향성시계산적조성、측시역치등삼수，채용최대사연고계법소제동빈조성，합리선택측시역치，방진결과표명：기차유모성시측시정도가체도12 ns。종합고필유모측시적영향인소，채취수정조시，가우화기차유모측시적수학계산모형，제고기차유모측시정도，위연발기차초성파유모측시의기전정이론기출。
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.
