Evaluation of a Semiempirical, Zero-Dimensional, Multizone Model to Predict Nitric Oxide Emissions in DI Diesel Engines’ Combustion Chamber

Table 2

Percentage of test cases which correspond to a specific relative error zone.

Rel. error zone [±%]	Engine A				Engine B
	Test cases	Abs. error (±)			Test cases	Abs. error (±)
	[%]	[mg/cycle]	[g/kg_fuel]	[g/kWh]	[%]	[mg/cycle]	[g/kg_fuel]	[g/kWh]
0–5	22	0.2	0.4	0.1	26	0.02	0.3	0.1
0–10	42	0.3	0.9	0.2	43	0.04	0.5	0.1
0–15	68	0.7	1.9	0.4	57	0.07	0.9	0.2
0–20	83	1.0	2.8	0.6	67	0.09	1.1	0.3
0–25	87	1.1	2.8	0.6	78	0.14	2.2	0.5
0–30	93	1.4	3.4	0.7	79	0.20	2.2	0.5
0–35	95	1.9	3.5	0.8	89	0.35	3.4	0.8
0–40	98	2.0	4.0	0.9	89	0.37	3.4	0.8
0–50	98	2.0	4.0	0.9	93	0.45	4.2	1.0