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 that uses a table representing maximum engine torque as a function of engine speed to estimate engine torque for vehicle performance simulations. Fuel consumption is approximated using two scalar fuel property parameters and one scalar engine efficiency parameter. You can use the block for:

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

• Vehicle-level performance simulations

You can change the default maximum torque and engine speed breakpoints in the table to customize the model for a specific engine application. Double-click the block and, in the Block Parameters dialog box, expand the Maximum torque curve section. Enter values for the Engine maximum torque, f_tqmax and Breakpoints for engine speed input, f_tqmax_n_bpt parameters, and then click Apply or OK.

Ports

Input

TrqCmd — Commanded torque

scalar

Torque, in N·m.

EngSpd — Engine speed

scalar

Engine speed, in rpm.

Output

Info — Bus

bus

Bus that contains these block calculations.

Signal			Description	Units
FuelMassFlw			Engine fuel flow output	kg/s
FuelVolFlw			Volumetric fuel flow	m3/s
EngTrq			Engine torque output	N·m
EngSpd			Engine speed	rpm
Bsfc			Engine brake-specific fuel consumption (BSFC)	g/kWh
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

Maximum Torque Curve

Engine maximum torque, f_tqmax — Breakpoints

[71 71 95 127 167 224 227 228 227 226 225 224 222 221 220 219 180 140] (default) | vector

Breakpoints, in N·m.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Parameter:	f_tqmax
Values:	1-by-N vector
Data Types:	double

Breakpoints for engine speed input, f_tqmax_n_bpt — Breakpoints

[0 750 1054 1357 1661 1964 2268 2571 2875 3179 3482 3786 4089 4393 4696 5000 6000 7000] (default) | vector

Breakpoints, in rpm.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Parameter:	f_tqmax_n_bpt
Values:	1-by-N vector
Data Types:	double

Fuel and Efficiency

Fuel lower heating value, Lhv — Heating value

4.6E+7 (default) | scalar

Fuel lower heating value, in J/kg.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Parameter:	Lhv
Values:	4.6E+7 (default) | scalar
Data Types:	double

Fuel specific gravity, Sg — Specific gravity

0.745 (default) | scalar

Specific gravity of fuel, dimensionless.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Parameter:	Sg
Values:	0.745 (default) | scalar
Data Types:	double

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

350 (default) | scalar

Average brake specific fuel consumption, in g/kwh.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Parameter:	BsfcAvg
Values:	350 (default) | scalar
Data Types:	double

Extended Capabilities

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

Version History

Introduced in R2021b