WOLFRAM SYSTEM MODELER

PCVE33

Electrically actuated proportional control valve with three ports and three states

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.ProportionalSolenoidActuation.PCVE33"]
Out[1]:=

Information

This is a model of a control valve with three ports and three states. The valve has a tank port t, a pressure port p, and a load port a. The insignals to the spools are u1 and u2. The valve is controlled by two electrical spools with dynamics; see SpoolP2Windings.


Control valve with three ports and three states. Here, the resulting control signal u is u1 - u2.


Valve at center position, u = 0; there is only leakage flow between the ports if there is no overlap


Valve at right position, u = -1; there is flow from a to t


Valve at left position, u = 1; there is flow from p to a

Implementation

This valve basically consists of orifices controlled by a spool.

Parameters (9)

medium

Value: Oil()

Type: Medium

Description: Medium in the component

V

Value: 0.0001

Type: Volume (m³)

Description: Volume of control valve

Gleak

Value: 1e-020

Type: PressureDependentLeakage (m³/(s⋅Pa))

Description: Leakage between orifices

overlap

Value: 0

Type: Length (m)

Description: Spool overlap, a number between -1 and 1; 0 if no overlap

AMax

Value: 0.001

Type: Area (m²)

Description: Maximum opening area

Cd

Value: 0.62

Type: Real

Description: Coefficient of discharge for the opening

Un

Value: 1

Type: Voltage (V)

Description: Spool nominal voltage

d

Value: 0.9

Type: Damping (s⁻¹)

Description: Spool damping

f

Value: 80

Type: Frequency (Hz)

Description: Spool resonance frequency

Connectors (5)

port_a

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_t

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_p

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

u1

Type: RealInput

Description: 'input Real' as connector

u2

Type: RealInput

Description: 'input Real' as connector

Components (9)

medium

Type: Medium

Description: Medium in the component

flow_at

Type: ControlledOrifice

Description: Controlled restriction

flow_pa

Type: ControlledOrifice

Description: Controlled restriction

volume_t

Type: Volume

Description: Fixed volume with fluid storage

volume_p

Type: Volume

Description: Fixed volume with fluid storage

volume_a

Type: Volume

Description: Fixed volume with fluid storage

gain1

Type: Gain

Description: Output the product of a gain value with the input signal

spool

Type: SpoolP2Windings

Description: An electrical spool with second-order characteristics

add

Type: Add

Description: Output the sum of the two inputs