Simple Engine

Simplified engine model using lookup tables

• Library:

• Powertrain Blockset / Propulsion / Combustion Engines

  Vehicle Dynamics Blockset / Powertrain / Propulsion

• 

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Description

The Simple Engine block implements a simplified engine model using a maximum torque vs engine speed table, two scalar fuel mass properties, and one scalar engine efficiency parameter to estimate engine torque and fuel flow. You can use the block for:

• Hardware-in-the-loop (HIL) engine control design

• Vehicle-level fuel economy and performance simulations

Ports

Input

TrqCmd — Commanded torque

scalar

Torque, in N·m.

EngSpd — Engine speed

scalar

Engine speed, in rpm.

Output

Info — Bus signal

bus

Bus signal containing these block calculations.

Signal			Description	Units
IntkGasMassFlw (zeroed out intentionally)			Engine air mass flow output	kg/s
NrmlzdAirChrg (zeroed out intentionally)			Normalized engine cylinder air mass	N/A
Afr (zeroed out intentionally)			Air-fuel ratio (AFR)	N/A
FuelMassFlw			Engine fuel flow output	kg/s
FuelVolFlw			Volumetric fuel flow	m3/s
ExhManGasTemp (zeroed out intentionally)			Engine exhaust gas temperature	K
EngTrq			Engine torque output	N·m
EngSpd			Engine speed	rpm
CrkAng (zeroed out intentionally)			Engine crankshaft absolute angle $${\displaystyle \underset{0}{\overset{(360)Cps}{\int }}EngSpd\frac{180}{30}d\theta }$$ where $$Cps$$ is crankshaft revolutions per power stroke.	degrees crank angle
Bsfc			Engine brake-specific fuel consumption (BSFC)	g/kWh
EoHC (zeroed out intentionally)			Engine out hydrocarbon emission mass flow	kg/s
EoCO (zeroed out intentionally)			Engine out carbon monoxide emission mass flow rate	kg/s
EoNOx (zeroed out intentionally)			Engine out nitric oxide and nitrogen dioxide emissions mass flow	kg/s
EoCO2 (zeroed out intentionally)			Engine out carbon dioxide emission mass flow	kg/s
EoPM (zeroed out intentionally)			Engine out particulate matter emission mass flow	kg/s
PwrInfo	PwrTrnsfrd	PwrCrkshft	Crankshaft power	W
	PwrNotTrnsfrd	PwrFuel	Fuel input power	W
		PwrLoss	Power loss	W
	PwrStored		Not used

EngTrq — Engine brake torque

scalar

Engine brake torque, in N·m.

Parameters

Engine maximum torque, f_tqmax — Breakpoints

[75.679776480773256 75.679776480773256 97.173658538143172 116.84042599160529 152.21029882684542 175 174.99889520597083 174.99996520122858 175 175 175 175 175 175 175 175] (default)

Breakpoints, in N·m.

Breakpoints for engine speed input, f_tqmax_n_bpt — Breakpoints

[0 750 1053.57142857143 1357.14285714286 1660.71428571429 1964.28571428571 2267.85714285714 2571.42857142857 2875 3178.57142857143 3482.14285714286 3785.71428571429 4089.28571428571 4392.85714285714 4696.42857142857 5000] (default)

Breakpoints, in rpm.

Fuel lower heating value, Lhv — Heating value

4.6E+7 (default)

Fuel lower heating value, in J/kg.

Fuel specific gravity, Sg — Specific gravity

0.745 (default)

Specific gravity of fuel, dimensionless.

Average brake specific fuel consumption, BsfcAvg — Average brake specific fuel consumption

350 (default)

Average brake specific fuel consumption, in g/kwh.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced in R2021b