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MapleSim Hydraulics Library from Modelon

Controlled Actuator  Actuator of a three-position directional control valve with first-order spool dynamics

The Controlled Actuator component describes the spool position of a directional control valve that has two coils. This model can be used if the controller is modeled in such a way that it uses one real output signal with the following spool positions:

• 

0 means the middle position of the spool

• 

-1 and +1 mean the valve is completely open

The commanded opening of the valve is input at u. The position of the spool (spoolPos) is modeled as a first-order system.

When u<0.95, then spoolPos&equals;1.

When 0.95<u, then spoolPos&equals;1.

Otherwise, spoolPos&equals;0.

Intermediate positions are also modeled.

The movement of the spool is described by a first-order system. This is appropriate for valves that are directly actuated by a spool. The time to shift from the neutral position to an end position (τopening) may be different than the time to shift to the neutral position (τclosing).

 

Equations

Connections

Parameters

Equations

spoolPos&equals;spoolposition

tau_spool&equals;τopening3noEvent1920<uτclosing3otherwise

tau_spooltspoolposition&plus;spoolposition&equals;−1u<192011920<u0otherwiseotherwise

Connections

Name

Description

Modelica ID

spoolPos

 

spoolPos

u

 

u

Parameters

Name

Default

Units

Description

Modelica ID

τopening

0.03

s

Switching time to open valve 95 %

tau_opening

τclosing

0.02

s

Switching time to close valve 95 %

tau_closing

See Also

DirectionalControl

MapleSim Hydraulics Library from Modelon Overview

 


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