Soft Sensor of Vehicle State Estimation Based on the Kernel Principal Component and Improved Neural Network

Table 1

Cumulative contribution ratio of different principles.

Principle number	Eigenvalues	Difference value	Percent variance (%)	Cumulative contribution ratio (%)
	5.123895	2.960055	47.4027	47.4027
	2.16384	0.56343	21.19649	68.59919
	1.60041	1.006635	15.67728	84.27647
	0.59367	0.2184	5.815851	90.09232
	0.375375	0.088725	3.676731	93.76905
	0.286545	0.128625	2.807074	96.57613
	0.15792	0.05124	1.547177	98.1233
	0.106785	0.04179	1.045749	99.16905
	0.06489	0.03822	0.588857	99.75791
	0.02667	0	0.242095	100