| 摘要:介绍了ABB热膜式空气流量计的工作原理,引入参比流量计对超差流量计进行误差提取。利用压气机特性曲线剔除因工况不一致引入的流量测量误差。分析了超差流量计信号处理单元对非线性误差修正的不足,建立了流量计偏差多项式拟合模型,基于极值理论提取出多项式系数,并应用于二次仪表。结果表明,经过修正后的空气流量计满足计量检定要求。 |
| 关键词: 柴油机 空气流量计 误差修正 |
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| Correction Method for Thermal Mass Air Flowmeterin the Application of Test Bench |
| Liu Fengchun,Zhang Jun,Zhu Ruifeng,Sun Xuedong,Zhang Yongqing |
| China North Engine Research Institute,Shanxi Datong 037036 |
| Abstract:The principle of ABB thermal mass flowmeter is introduced. Error extraction of ultra difference flowmeter was carried out with the employment of the reference meter, and characteristic curve of compressor was employed to exclude air flow measurement errors because of inconsistent conditions. Analysis of the disadvantages of ultra poor flowmeter signal processing unit in the the nonlinear error correction was carried out. Flow deviation polynomial fitting model was established, and extreme value theory was extracted based on polynomial coefficient, and applied to Secondary Apparatus. The results show that the revised air flow meter could meet the measuring inspection requirements. |
| Key words: diesel engine air flow meter error correction〖FL |
