SANY LATIN AMERICA
4-178
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
4.9.4.2 Constant power control
ZX215-1002199
P
Max
P
Max
P
0
Q
P
Pressure
Flow
Pump P-Q curve
Function
●
Calculation of theoretical maximum dis-
charge amount of the pump. The system
applies constant power control. The two
adjustor act together hydraulically, and
keep two executing unit of the same speci-
fication and acting together in synchroni-
zation. The change of pump discharge is
determined by the sum of operating pres-
sure of the two hydraulic pumps
P
∑
. When
is met, the sum of the
power of the two hydraulic pumps remains
constant below the power of the engine.
Operation
●
When the work equipment is working, the
controller collects the throttle gear signal,,
a constant current value is provided and
pump power control is achieved.
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