Research on the NOX concentration inversion based on the W-V-A wavelength selection method

In view of the shortcomings of traditional wavelength selection algorithm in the processing of mixed NOX spectral data, combined with the absorption characteristics of engine exhaust component NO&NO2, the W-V-A (WPLS-VIP-ACO) spectral wavelength selection algorithm has been proposed. This algorithm combines the advantages of Ant Colony Optimization (ACO), Variable Importance in the Projection (VIP), and Weighted Partial Least Squares (WPLS) for the concentration inversion modeling. Wavelength selection and concentration inversion experiments have been carried out on the absorption spectrum of the mixed NOX with W-V-A algorithm. The results show that the wavelength of W-V-A algorithm has been selected and the concentration inversion of NOX has been performed precisely. The root mean square error (RMSEP) of NO concentrations has reduced from 0.0764 to 0.0095, and its cross validation of mean square error (RMSECV) has reduced from 0.0169 to 0.0078, meanwhile RMSEP of NO2 concentrations has reduced from 0.0123 to 0.0029, and its RMSECV has reduced from 0.0133 to 0.0041, all of which means the NOX concentration can be accurately inverted in the presence of interfering components. Moreover, compared with other traditional wavelength selection methods, W-V-A algorithm can minimize the RMSEP and RMSECV indicators of the established WPLS concentration inversion model with fewer wavelength points simultaneously.In view of the shortcomings of traditional wavelength selection algorithm in the processing of mixed NOX spectral data, combined with the absorption characteristics of engine exhaust component NO&NO2, the W-V-A (WPLS-VIP-ACO) spectral wavelength selection algorithm has been proposed. This algorithm combines the advantages of Ant Colony Optimization (ACO), Variable Importance in the Projection (VIP), and Weighted Partial Least Squares (WPLS) for the concentration inversion modeling. Wavelength selection and concentration inversion experiments have been carried out on the absorption spectrum of the mixed NOX with W-V-A algorithm. The results show that the wavelength of W-V-A algorithm has been selected and the concentration inversion of NOX has been performed precisely. The root mean square error (RMSEP) of NO concentrations has reduced from 0.0764 to 0.0095, and its cross validation of mean square error (RMSECV) has reduced from 0.0169 to 0.0078, meanwhile RMSEP of NO2 concentrations has reduced from 0.012...