Actuator Fault Diagnosis with Application to a Diesel Engine Testbed

Table 4

The variables used in the engine model.

Symb.	Quantity	Value/unit
	Pressure in intake manifold	Pa
	Atmospheric pressure	Pa
	Exhaust mass flow past the turbine	kg·s^−1
	Position of VNT vanes	%
	Engine speed	min^−1
	Mass flow of injected fuel	kg·s^−1
	Lower heating value	J·kg^−1
	Effective area of EGR valve	m^2
	Gas constant in intake manifold	J·(kg·K)
	Mass flow into engine inlet ports	kg·s^−1
	Temperature in the intake manifold	K
	Mass of air in intake manifold	kg
	Mass of EGR gas in intake manifold	kg
	Exhaust mass flow into the exhaust manifold	kg·s^−1
	Mass of exhaust gas in exhaust manifold	kg
	Pressure in exhaust manifold	Pa
	Specific heat at const. pres. in intake manifold	J·(kg·K)
	Specific heat at const. vol. in intake manifold	J·(kg·K)
	Ratio of specific heats
	Air mass flow past the air mass flow sensor	kg·s^−1
	EGR mass flow into intake manifold	kg·s^−1
	Volume of intake manifold	m^3
	Gas constant of air	288.2979 J·(kg·K)
	Specific heat at const. pres. of air	1067.4 J·(kg·K)
	Specific heat at const. vol. of air	779.1021 J·(kg·K)
	Gas constant of exhaust gas of exhaust gas	290.155 J·(kg·K)
	Specific heat at const. pres. of exhaust gas	1288.08 J·(kg·K)
	Specific heat at const. vol. of exhaust gas	997.9250 J·(kg·K)
	Temperature of the air after the charge-air cooler	322.5 K
	Temperature of EGR gas flow into the i.m.	322 K
	Temperature in exhaust manifold	837 K
	Engine displacement	m^3
	Volume of exhaust manifold	m^3