Experimental Investigation on Impact of EGR Configuration on Exhaust Emissions in Optimized PCCI-DI Diesel Engine

Table 4

Data preprocessing for response variables.

Run No.	Taguchi design				Normalized values of S/N ratios Zij				Comparability sequence				Grey relational coefficient				Grey relational grade	Rank
	A	B	C	D	NOx	HC	CO	Smoke	NOx	HC	CO	Smoke	NOx	HC	CO	Smoke
1	1	1	1	1	0.602	0.500	0.631	0.301	0.398	0.500	0.369	0.699	0.557	0.500	0.575	0.417	0.512	5
2	1	2	2	2	0.313	0.592	0.465	0.133	0.687	0.408	0.535	0.867	0.421	0.551	0.483	0.366	0.455	7
3	1	3	3	3	0.000	1.000	0.893	0.228	1.000	0.000	0.107	0.772	0.333	1.000	0.823	0.393	0.637	3
4	2	1	2	3	1.000	0.523	0.771	1.000	0.000	0.477	0.229	0.000	1.000	0.512	0.686	1.000	0.800	1
5	2	2	3	1	0.759	0.939	0.631	0.589	0.241	0.061	0.369	0.411	0.675	0.891	0.575	0.549	0.672	2
6	2	3	1	2	0.276	0.615	1.000	0.361	0.724	0.385	0.000	0.639	0.408	0.565	1.000	0.439	0.603	4
7	3	1	3	2	0.586	0.569	0.000	0.133	0.414	0.431	1.000	0.867	0.547	0.537	0.333	0.366	0.446	8
8	3	2	1	3	0.930	0.000	0.262	0.228	0.070	1.000	0.738	0.772	0.878	0.333	0.404	0.393	0.502	6
9	3	3	2	1	0.518	0.158	0.465	0.000	0.482	0.842	0.535	1.000	0.509	0.372	0.483	0.333	0.425	9