空燃比分析仪标校研究

Air-fuel Ratio Analyzer Calibration Study

传统的空燃比分析仪标校方法分为浓燃和稀燃两段进行标校.文中搭建了针对空燃比分析仪的测试环境,利用自主研发的控制系统获得了从浓燃到稀燃不同λ值下宽域氧(UEGO)传感器的极限电流值,使用Origin软件进行多项式拟合,将拟合的公式运用到空燃比分析仪的控制系统中,完成标校.实验结果表明,标校后空燃比分析仪的Ip-λ值曲线与博世LSU4.9数据手册的曲线高度吻合,所测得的λ值与日本HORIBA-730λ仪误差不超过1%.

The traditional calibration method for the air-fuel ratio analyzer is divided into two sections:thick and dilute combustion.This paper has set up a test environment for the air-fuel ratio analyzer,and with independent researched and developed control system,the limited current of wide-domain oxygen(UEGO)sensor under different value ofλis obtained from the thick combustion to dilute combustion.Using Origin software for polynomial fitting,the fitting formula is applied to the air-fuel ratio control system of the instrument and the calibration is completed.The experimental results show that the Ip-λvalue curve of the calibrated rear air-fuel ratio analyzer is highly coincident with the curve of Bosch LSU4.9 data manual,and the difference between the measuredλvalue and Japan HORIBA-730 reflector is less than 1%.