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MapleSim Hydraulics Library from Modelon

Diesel No States  Diesel engine with speed controller

This component describes a diesel engine with speed controller but without inertia.

Implementation

The component uses a static characteristic curve of maximum torque as a function of speed. This relation is given by a polynomial:

taumax=w3diesel3+w2diesel2+wdiesel1+diesel0

There is a simple speed controller implemented. The reference signal for this controller is given by:

reference signal = wmincommandedSpeed=0wmaxcommandedSpeed=1

Limitations

This simple component does not describe the startup of a diesel engine. (Set initial conditions for coupled inertia between wmin and wmax.)

 

Equations

Variables

Connections

Parameters

Equations

taumax=w3diesel3+w2diesel2+wdiesel1+diesel0

tauref=wRefwkdiesel

w=tφb

wRef&equals;wminwRefu<wminwmaxwmax<wRefuwRefuotherwiseotherwise

wRefu&equals;wmin&plus;wmaxwmincommandedSpeed

flange_b.tau&equals;5ww<wmin2taumaxtaumax<tauref3taumax10tauref<3taumax10taurefotherwiseotherwiseotherwise

Variables

Name

Value

Units

Description

Modelica ID

wRefu

 

rads

 

wRefu

wRef

 

rads

 

wRef

w

 

rads

Absolute angular velocity of component

w

taumax

 

Nm

 

taumax

tauref

 

Nm

 

tauref

Connections

Name

Description

Modelica ID

flangeb

(right) driven flange (flange axis directed OUT OF cut plane)

flange_b

commandedSpeed

Connector of input signal used as flow rate

commandedSpeed

Parameters

Name

Default

Units

Description

Modelica ID

wmin

75

rads

Minimum angular velocity

wmin

wmax

240

rads

Maximum angular velocity

wmax

diesel3

9.02·10-6

 

 

diesel3

diesel2

0.00752

 

 

diesel2

diesel1

1.5939

 

 

diesel1

diesel0

75.022

 

 

diesel0

kdiesel

10

 

Gain of speed controller, Nm/(rad/sec)

kdiesel

See Also

Pumps

MapleSim Hydraulics Library from Modelon Overview

 


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