A Deep Transfer NOx Emission Inversion Model of Diesel Vehicles with Multisource External Influence

Table 4

Spearman coefficients and corresponding T values.

Feature		T
Engine speed	0.3035	21.95
Actual output torque percentage	0.4749	34.34
Temperature of engine water	0.0281	2.03
Temperature of engine oil	0.0178	1.29
After-treatment downstream oxygen percentage	−0.4292	−31.04
Urea tank level percentage	0.0169	1.22
Environmental temperature	0.0093	0.67
After-treatment exhaust gas mass flow rate	0.4868	35.20
Temperature of urea tank	−0.0008	−0.055
Vehicle speed	0.1482	10.72
Gas pedal opening	0.4847	35.05