Non Feedback Proportional Electric Control (NFPE)
The Non Feedback Proportional Electric (NFPE) control is an electrical automotive control in which an
electrical input signal activates one of two proportional solenoids that port charge pressure to either side
of the pump servo cylinder. The NFPE control has no mechanical feedback mechanism.
A serviceable 170 μm screen is located in the supply line immediately before the control porting spool.
Non Feedback Proportional Electric Control
P003 192
NFPE schematic
P003 188
C2
C1
F00A
M14
T
P
F00B
The pump displacement is proportional to the solenoid signal current, but it also depends upon pump
input speed and system pressure. This characteristic also provides a power limiting function by reducing
the pump swashplate angle as system pressure increases. A typical response characteristic is shown in
the accompanying graph. Under some circumstances, such as contamination, the control spool could
stick and cause the pump to stay at some displacement.
Technical Information
H1 Axial Piston Single Pumps, Size 045/053
Control Options
26 |
©
Danfoss | May 2017
11063344 | BC00000059en-US1001
