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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

 

ϕm = ϕb  ϕsupport        use support = true0otherwise  

 

 

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

 

 

τbt= β · τout1t           mode = torque vs speed τout2t         mode = power vs speed

 

 

 

Where

 

     0  β  1 is the throttle input

 

 

Also

 

 

τout1t&equals; kT· &lcub;χink&omega; · ωmin· ek0ωmin  ωmt               0  &omega;mt  ωmin&chi;ink&omega; · ωmt               ωmin< &omega;mt < &omega;maxχink&omega; · ωmax· ek0ωmt  &omega;max                &omega;min  &omega;mt

 

 

and

 

τout2t&equals; kpk&omega;· &lcub;χinkω · ωminωmin· ek0ωmin  ωmt               0  ωmt  ωminχinkω · ωmtωmt               ωmin< &omega;mt < &omega;maxχinkω · ωmaxωmax· ek0ωmt  ωmax                ωmin  ωmt

 

 

 

 

 

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

Also k0 &gt; 0  is a constant to adjust how quickly output torque goes to zero once the engine speed falls outside the set limits.
kω, kp, and kT  are the speed, power, and torque unit conversion factors, respectively.

  χin 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

flangeb

-

Engine output shaft

flange_b

throttle &beta;

-

Real input port for engine throttle, from 0 (idle) to 1 (maximum torque)

throttle

support

use support&equals;true

Conditional Support Flange

loss

 

 

 

 

Parameters

Symbol

Condition

Default

Units

Description

ID

mode

-

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

ωmin

-

100 &pi;3

rads

Stall speed of the engine

minw

ωmax

-

200 &pi;

rads

Maximum speed of the engine

maxw

k0

-

0.1

srad

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

k0

data source

-

GUI

-

Defines the source for the loss data:

• 

entered via GUI [GUI]

• 

by an attachment [attachment]

• 

by an external file [file]

datasourcemode

use support

-

false

-

Enables/disables the support flange

useSupport

speed unit

RPM

-

Defines whether the speed data has the unit:

• 

rad/s [rad/s]

• 

RPM [RPM]

• 

User defined [user-defined]

angularspeedunitmode

k&omega;

speed unit = user defined 

1

radsUuser

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

userspeedscale

torque unit

mode = torque vs. speed

N·m

-

Defines whether the torque data has the unit:

• 

rad/s [N.m]

• 

lb-ft [pound-feet]

• 

User defined [user-defined]

torqueunitmode

kt

torque unit = user-defined

1

N·mUuser

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

usertorquescale

power unit

mode = power vs. speed

kW

-

Defines whether the torque data has the unit:

• 

Watt [W]

• 

Kilo Watt [kW]

• 

horsepower [hp]

• 

User defined [user-defined]

powerunitmode

kp

power unit = user-defined

1

WUuser

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

userpowerscale

 

 

 

 

 

 

 

 

 

 

 

 

data

data source = GUI

0&comma; 260 1000&comma; 260 1500&comma; 325 2000&comma; 360..&period; 6500&comma; 280 7000&comma; 260 7500&comma; 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

fileName

column

data source = attachment or file

2

-

The column number where the engine data is stored

1st column is always the speed data

column

smoothness

-

Table points are linearly interpolated

-

Defines the smoothness of table interpolation

There are two options:

• 

Table points are linearly interpolated

• 

Table points are interpolated such that the first derivative is continuous

smoothness

See Also

MapleSim Driveline Library Overview

MapleSim Library Overview

1-D Mechanical Overview

Engines and Dynamometers

 

 

 


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