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

Table 5

L₉ (3⁴) Factors and responses in the orthogonal array test matrix.

Run no.	Coded Input Parameters								Responses
	A		B		C		D
	Injection timing (CA BTDC)		EGR rate (%)		Dieseline ratio (D : G) (% by vol.)		Load (%)
	Code	Actual	Code	Actual	Code	Actual	Code	Actual	NOx in g/kWh	HC in g/kWh	CO in g/kWh	Smoke in/m
1	−1	23	−1	25	−1	60	−1	25	2.73	153	0.06	0.05
2	−1	23	0	35	0	80	0	50	2.10	157	0.05	0.03
3	−1	23	1	45	1	90	1	75	1.58	176	0.08	0.04
4	0	25	−1	25	0	80	1	75	3.92	154	0.07	0.42
5	0	25	0	35	1	90	−1	25	3.15	173	0.06	0.12
6	0	25	1	45	−1	60	0	50	2.03	158	0.09	0.06
7	1	30	−1	25	1	90	0	50	2.69	156	0.03	0.03
8	1	30	0	35	−1	60	1	75	3.68	133	0.04	0.04
9	1	30	1	45	0	80	−1	25	2.53	139	0.05	0.02