SANY LATIN AMERICA
4-179
SY195/205/215/225C9 Crawler Hydraulic Excavator
Structure and Function
Shop Manual - June 2013
Function
●
Changing of the engine speed due to load
change controls the pump power, and en-
gine output can be used more efficiently.
(This function can also prevent the engine
from losing control when the machine is
operating under harsh conditions (eg. high
- altitude area).
Operation
The engine control panel controls the target
operating speed of the engine.
●
The engine controller collects the actual
speed signal from the ECM, and preforms
a closed loop control with the target oper-
ating speed. Then, the controller involves
the output of closed-loop control with the
calculation of the solenoid valve control
signal, and sends the final adjusting cur-
rent signal to the pump proportional sole-
noid valve.
●
The solenoid valve feeds pilot pressure oil
to the pump adjustor according to the sig-
nal of the controller, and controls the pump
discharge amount.
ESS control
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