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MapleSim Hydraulics Library from Modelon

Coils_X_2  Coil of a two-position directional control valve with first-order spool dynamics

The Coils_X_2 component describes the spool position of a directional control valve that has one coil.

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

When commandB=false, then spoolPos=0.

When commandB=true, then spoolPos=1.

Intermediate spool 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=spoolposition

tau_spool=τopening3commandBτclosing3otherwise

tau_spooltspoolposition+spoolposition=1commandB0otherwise

Connections

Name

Description

Modelica ID

commandB

Command signal for valve

commandB

spoolPos

 

spoolPos

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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