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MapleSim Hydraulics Library from Modelon

Diesel  Diesel engine with speed controller

This component describes a diesel engine with speed controller and inertia.

Implementation

The Diesel 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:

commandedSpeed = 0  wmin

commandedSpeed = 1  wmax

To set the initial speed of the diesel engine use, the parameter wstart under the Properties tab ( ). Do not use the modifier Flywheel(w(start=100)) or connect the shaft rigidly to other inertias which have been assigned initial values because this may override the parameter wstart.

Limitations

This simple model does not describe the startup of a diesel engine.

 

Variables

Connections

Parameters

Variables

Name

Value

Units

Description

Modelica ID

MnS

 

 

Diesel engine with speed controller without inertia

MnS

Flywheel

 

 

 

Flywheel

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

wstart

200

rads

Angular velocity at simulation start

wstart

wmin

75

rads

Minimum angular velocity

wmin

wmax

240

rads

Maximum angular velocity

wmax

J

1

kgm2

Moment of inertia of flywheel

J

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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