WOLFRAM SYSTEM MODELER

PCVE43ClosedCenter

Electrically actuated proportional control valve with four ports and three states

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.DirectionalControl.ProportionalSolenoidActuation.PCVE43ClosedCenter"]
Out[1]:=

Information

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


Control valve with four ports and three states


Valve with no overlap at center position. At the center position the valve is closed, and there is only leakage flow between the ports if there is no overlap.


Valve at left position, u1 - u2 = 1; there is flow from p to a and from b to t


Valve at right position, u1 - u2 = -1; there is flow from a to t and from p to b

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 (6)

port_p

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_t

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)

port_a

Type: Port_b

Description: Port for hydraulic fluid (unfilled 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

volume_a

Type: Volume

Description: Fixed volume with fluid storage

volume_b

Type: Volume

Description: Fixed volume with fluid storage

volume_t

Type: Volume

Description: Fixed volume with fluid storage

volume_p

Type: Volume

Description: Fixed volume with fluid storage

rightState

Type: CrossOver4Port

Description: Basic building block for directional control valves

leftState

Type: Straight4Port

Description: Basic building block for directional control valves

spool

Type: SpoolP2Windings

Description: An electrical spool with second-order characteristics

add

Type: Add

Description: Output the sum of the two inputs

Used in Examples (2)

Servo1

Hydraulic.Examples.Translation

Example circuit of a cylinder moving a load

Filters

Hydraulic.Examples.Filter

Example of a hydraulic system using filters