Moog ACV with CANopen bus interface
7 Servo valve functions
Spool position (Q) / pressure (P) switchover
B99224-DV018-D-211, Rev. A, October 2018
187
7.5.21.1 Object 0x230C[N]: Hydraulic capacity
The parameter <HydraulicCapacity> (0x230C) is defined as
. The unit is defined as [10
-6
l/bar].
7.5.21.2 Object 0x231C: Sys Pressure Reference
This parameter holds the system pressure which is the reference to calculate the gains for the pressure con-
troller in the automatic parameterization.
7.6 Spool position (Q) / pressure (P) switchover
The following structure is used to switch between spool position control and pressure control. This block is ef-
fective in the pQ control mode, the <ControlMode> (0x6043) is set to 5 (p/Q-control servo valve). The output
of this switch is routed to the spool position controller. Three strategies are implemented to influence the swi-
tchover criteria.
Chapter "7.1.1 Object 0x6043: Control mode", page 128
Figure 93: Spool position (Q) / pressure (P) switchover
V
E
Oil
------------
ValvePressureControl
Index
Sub-index
Parameter name
Data type
Access
Per-
sistence
Value range
Default
0x230C
N=1…16
HydraulicCapacity
FLOAT32
rw
Y
0.0…+inf
0.0
ValvePressureControl
Index
Sub-index
Parameter name
Data type
Access
Per-
sistence
Value range
Default
0x231C
1
HydraulicCapacity
INT16
rw
N
INT16
400
0x231C
2
Unit
UINT8
ro
-
UINT8
0
0x231C
3
Prefix
INT8
ro
-
INT8
0
Q
p
<DemandValuePilot>
(0x3300)
Pressure
<ControllerOutput>
(0x2418)
<SplDemandValue>
(0x6310)
0
1
2
0
1
2
<pQSwitchingMode>
(0x586C[N])
<pQSwitchingMode>
(0x586C[N])
Minimum
positiv
direction
Minimum
both
directions
Force
exceeded
both directions
