Engine - MapleSim Help

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Engine

Simple torque driver Engine component

The Engine component provides a first-approximation model for any type of internal combustion engine (spark ignition, diesel, etc.). The engine power characteristics are determined by a lookup table for power vs. engine speed data, or torque vs. engine speed data.

Equations

-{[[`ϕ`[support], use support = true],[0,otherwise]]

Where is the absolute rotation angle and the engine output torque is defined by:

tau[b](t)= -beta * {[[tau[out`1`](t), mode = torque vs speed ],[tau[out2](t), mode = power vs speed]]

Where

is the throttle input

Also

and

Where and are the lower and upper speed limits where the engine exerts torque, respectively.

Also is a constant to adjust how quickly output torque goes to zero once the engine speed falls outside the set limits.
, , and are the speed, power, and torque unit conversion factors, respectively.

is the interpolation function that uses user input data and depending on the choice for the mode parameter, the input data is either torque vs. speed data or power vs. speed data

Connections

Name	Condition	Description	ID
	-	Engine output shaft	flange_b
	-	Real input port for engine throttle, from 0 (idle) to 1 (maximum torque)	throttle
		Conditional Support Flange	loss

Parameters

Symbol

Condition

Default

Units

Description

torque vs. speed

Defines whether:

•	Torque vs. speed data is used to calculate engine torque [torque vs. speed] or

•	Power vs. speed data is used to calculate engine torque [power vs. speed]

enginedatamode

Stall speed of the engine

minw

Maximum speed of the engine

maxw

Factor controlling the rate at which engine torque goes to zero outside the operating range.

data source

GUI

Defines the source for the loss data:

•	entered via GUI [GUI]

•	by an attachment [attachment]

•	by an external file [file]

datasourcemode

false

Enables/disables the support flange

useSupport

RPM

Defines whether the speed data has the unit:

•	rad/s [rad/s]

•

RPM [RPM]

•	User defined [user-defined]

angularspeedunitmode

speed unit = user defined

rad*[U[user]]/s

Speed conversion factor from the user-defined unit [] to rad/s

userspeedscale

mode = torque vs. speed

Defines whether the torque data has the unit:

•	rad/s [N.m]

•	lb-ft [pound-feet]

•	User defined [user-defined]

torqueunitmode

torque unit = user-defined

Torque conversion factor from the user-defined unit [] to N.m

usertorquescale

mode = power vs. speed

Defines whether the torque data has the unit:

•

Watt [W]

•	Kilo Watt [kW]

•	horsepower [hp]

•	User defined [user-defined]

powerunitmode

power unit = user-defined

Torque conversion factor from the user-defined unit [] to N.m

userpowerscale

data

data source = GUI

[0, 260 1000, 260 1500, 325 2000, 360 ... 6500, 280 7000, 260 7500, 250]

Defines engine curve:

•	if mode = [torque vs. speed]: the data is interpreted as speed-dependent maximum torque. (1st column speed, 2nd column torque)

•	if mode = [power vs. speed]:the data is interpreted as speed-dependent maximum power. (1st column speed, 2nd column power)

engineData

data source = attachment

Defines engine curve:

•	if mode = [torque vs. speed]: the data is interpreted as speed-dependent maximum torque. (1st column speed, column number given by column parameter is torque)

•	if mode = [power vs. speed]: the data is interpreted as speed-dependent maximum power. (1st column speed, column number given by column parameter is power)

data

data source = file