Simple Engine

Simplified engine model using lookup tables

Since R2021b

Libraries:
Powertrain Blockset / Propulsion / Combustion Engines
Vehicle Dynamics Blockset / Powertrain / Propulsion

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

expand all

TrqCmd — Commanded torque
`scalar`

Torque, in N·m.

EngSpd — Engine speed
`scalar`

Engine speed, in rpm.

Output

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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 $\int_{0}^{(360) C p s} E n g S p d \frac{180}{30} d θ$ where $C p s$ is crankshaft revolutions per power stroke.	deg
`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
	`PwrNotTrnsfrd`	`PwrLoss`	Power loss	W
	`PwrStored`		Not used

EngTrq — Engine brake torque
`scalar`

Engine brake torque, in N·m.

Parameters

expand all

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.

Simple Engine

Description

Ports

Input

TrqCmd — Commanded torque
`scalar`

EngSpd — Engine speed
`scalar`

Output

Info — Bus signal
bus

EngTrq — Engine brake torque
`scalar`

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 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)

Fuel lower heating value, Lhv — Heating value
`4.6E+7` (default)

Fuel specific gravity, Sg — Specific gravity
`0.745` (default)

Average brake specific fuel consumption, BsfcAvg — Average brake specific fuel consumption
`350` (default)

Extended Capabilities

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

Version History

Simple Engine

Description

Ports

Input

TrqCmd — Commanded torque scalar

EngSpd — Engine speed scalar

Output

Info — Bus signal bus

EngTrq — Engine brake torque scalar

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 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)

Fuel lower heating value, Lhv — Heating value 4.6E+7 (default)

Fuel specific gravity, Sg — Specific gravity 0.745 (default)

Average brake specific fuel consumption, BsfcAvg — Average brake specific fuel consumption 350 (default)

Extended Capabilities

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

Version History

TrqCmd — Commanded torque
`scalar`

EngSpd — Engine speed
`scalar`

Info — Bus signal
bus

EngTrq — Engine brake torque
`scalar`

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 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)

Fuel lower heating value, Lhv — Heating value
`4.6E+7` (default)

Fuel specific gravity, Sg — Specific gravity
`0.745` (default)

Average brake specific fuel consumption, BsfcAvg — Average brake specific fuel consumption
`350` (default)

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