Content .. 15 16 17 18 ..

SANY Crawler Hydraulic Excavator SY365H-9, SY365BH-9. Shop Manual (2014) - page 17

4-178

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002197

MAX

Arm OUT PPC pressure

Bucket CURL PPC pressure

Bucket DUMP PPC pressure

L. Travel PPC pressure

Swing PPC pressure

Arm IN PPC pressure

Boom RAISE PPC pressure

Pump 1
delivery
amount

Corresponding
delivery output

Fig. 4-185

4-179

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002198

Pump 2
delivery
amount

Boom RAISE PPC pressure

Arm IN PPC pressure

Arm OUT PPC pressure

Bucket CURL PPC pressure

Bucket DUMP PPC pressure

Boom LOWER PPC pressure

R. Travel PPC pressure

MAX

Corresponding
delivery output

Fig. 4-186

Function

Use the work equipment and swing pilot pres-
sure signal directly as the hydraulic pump dis-
charge control signal. Pilot pressure is applied
on the valve stem and, on the other hand,
is collected by the controller. The controller
keeps the discharge amount of the hydraulic
pump at the speci

ed value of the correspond-

ing pilot pressure according to the functional
relation between the set hydraulic pump dis-

charge amount and pilot pressure. During
combined operation, the set discharge amount
of each operation shall be added.

Operation

When the work equipment is operating, the
controller collects the signal of pilot pressure
sensor, and determines the control discharge
amount of pump 1 and pump 2 according to
the pressure signal.

4-180

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Function

Operation

●

It is mainly used to calculate the theoreti-
cal maximum displacement. The system
employs constant power control. Two
regulators are interconnected hydraulically,
enabling synchronized operation of two
actuators of the same specification at the
same time. Change of pump

ow is deter-

mined by the sum P

∑

of working pressures

of both hydraulic pumps. So long as it sat-
is

≤

∑

≤

2 P

Max,

the sum of powers

of both hydraulic pumps remains constant,
exceeding not the power of diesel engine.

●

When work equipment is working, the con-
troller collects throttle position signal and
gives a constant current in order to control
power of pump.

4.10.4.1 Constant power control

ZX215-1002199

Pressure

Flow

Max

Pump curve P-Q

Function

Operation

4.10.4.2 ESS control

●

Changing of the engine speed due to load change controls the pump power, and engine out-
put can be used more ef

ciently. (This function can also prevent the engine from losing con-

trol when the machine is operating under harsh conditions (eg. high - altitude area).

The engine control panel controls the target operating speed of the engine.

●

The engine controller collects the actual speed signal from the speed sensor, and preform a
loop control with the target operating speed. Then, the controller involves the output of loop
control with the calculation of the solenoid valve control signal, and sends the

nal regulating

current signal to the pump proportional solenoid valve.

●

The solenoid valve controls pump

ow by feeding pilot oil to the pump regulator according to

the signal sent from the controller.

Fig. 4-187

4-181

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.5 Valve control function

W365413086

Esc

Enter

Engine

Pressure sensor

Swing priority

Bucket confluence

Main pump

Injection
pump

Governor
motor

Main control valve

Speed
sensor

Servo

Valve

Fuel control dial

CAN bus

(Motor drive signal)

(Throttle position feedback signal)

(Control signal)

(Engine speed signal)

Swing signal

Bucket DUMP signal

Bucket DIG signal

Arm OUT signal

Arm IN signal

Boom DOWN signal

Boom UP signal

Left travel signal

Right travel signal

Controller

Fig. 4-188

●

Bucket

ow control

●

Swing priority control

4-182

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

ZX215-1002201

Swash plate angle

Bucket joystick
pilot pressure

Max

Min

ZX305-1002202

Bucket confluence
valve current

450mA

400mA

Bucket joystick
pilot pressure

Fig. 4-189

Fig. 4-190

1) Bucket

ow control

Function

Control the pump swash plate angle according
to the operation of bucket control lever.

Operation

When the bucket control lever is operated, the
controller collects the signal from the bucket
DUMP pressure sensor and bucket CURL
pressure sensor, and controls the bucket con-

uence proportional valve.

2) Swing priority control

Function

●

Pressurized oil from pump 1 bypasses bucket 1 valve spool, and

ows

rst to swing motor

valve spool to activate swing

rst.

Operation

●

When signals from pump 1 pressure sensor, arm pressure sensor and swing pressure sensor
meet the following conditions, the controller activates the solenoid valve. The solenoid valve
conducts pilot pressure oil to arm

ow controller and limits the alternate circuit of arm 1 valve

spool. Swing valve spool

rst ensures swing motor power, preventing the counter acting force

when the arm is retracting from affecting the positioning of the upper swing structure.

Operating condition

●

Swing pressure sensor: signal output available

4-183

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.6 Dual travel speed control

W365413085

Esc

Enter

Travel Motor

Regulator

Main Control Valve

Travel Speed
Solenoid Valve

Left travel pressure sensor

Right travel pressure sensor

Engine

Injection
Pump

Governor
Motor

Main Pump

Servo

Fuel Control Dial

(Control signal)

Controller

(CAN Bus)

(Throttle position

feedback signal)

(Motor drive signal)

Fig. 4-191

4-184

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Function

Travel mode control

Operation

●

When travel mode is set to LOW, the angle
travel motor swashplate reaches its maxi-
mum and travel speed is slow.

●

When the controller receives signal from
travel pressure sensor under the following
condition, it activates the solenoid valve.
The solenoid valve delivers pilot oil to the
travel motor swashplate angle control valve
in order to reduce the angle to its minimum
and increase travel speed.

Operating condition

Fast travel function on the monitor is on.

Note:

When lifting the track on one side with

the help of work equipment and running the
track, the pump control pressure on the side
increases to enable fast running of the track.
When the machine is traveling under HIGH
mode, the travel mode cannot be changed
even if work equipment is operated (work
equipment pressure sensor is turned ON).

4-185

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.7 Engine preheat/overheat alarm

W365413087

Esc

Enter

Heat

Start switch

Main Control Valve

Preheat Relay

Engine

Main Pump

Governor motor

Coolant Temp
Sensor

(CAN bus)

(Motor drive signal)

(Throttle position

feedback signal)

Controller

Servo

(Control signal)

Fig. 4-192

4-186

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

1) Engine preheating

Function

●

Preheat control

Operation

●

The excavator starts preheating when it is powered on.

Operating condition

●

Low temperature switch is closed; excavator is energized; auto preheating begins at starting.

2) Engine overheat alarm

Function

●

When coolant temperature is high (over 103

℃

) during operation, the monitor displays alarm.

Operation

●

The controller collects signal from coolant temperature sensor. If coolant temperature is too
high, alarm message will be generated and sent to the monitor. Receiving the alarm message,
the monitor will illuminate the alarm indicator light.

Operating condition

●

Power on

●

Coolant temperature greater than 103

℃

3) Alarm - low engine oil pressure

Function

●

The controller collects signal from engine oil pressure sensor. When engine speed is greater
than 600 rpm and engine oil pressure is too low, alarm message will be generated and sent to
the monitor. Receiving the alarm message, the alarm indicator lights up.

4-187

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.8 Auto deceleration/acceleration control

Function

●

When all control levers are in the neutral
position, lower engine speed in order to re-
duce fuel consumption and noise.

●

When any control lever is operated, engine
speed will be back to the setting of the fuel
control dial.

ZX225-1002022

Esc

Enter

Engine

Engine
throttle
controller

Fuel Control Dial

Right Joystick control

Boom

Bucket

Controller

CAN Bus

Control lever signal

Swing

Arm

Left
Joystick
Control

Left travel

Right travel

Travel
Control
Levers

DOWN

DIG

DUMP

OUT

RIGHT

LEFT

FWD

BWD

FWD

BWD

(Throttle signal)

Fig. 4-193

Fig. 4-194

ZX335-1002061

0.2S

Drop 100 rpm

0.5S

(1400rpm)

0.5S

3.2S

Speed (rmp)

Set speed

Auto deceleration

Control lever

Time (s)

Operated

Unoperated

Operated

Operation

●

Engine speed will drop to the speed of gear position 1 (100 rpm lower than the set speed) 0.2
second after the control levers are placed in the neutral position. The engine will run at low
speed (1400 rpm) after another three (3) seconds. This can reduce void

ow of hydraulic sys-

tem and wear of the engine, hence saving energy and reducing noise. When any control lever
is operated to resume the operation, the engine speed will be restored.

●

When any control lever is operated during engine deceleration, engine speed will increase im-
mediately to the speed set by the fuel control dial.

4-188

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.9 Engine speed calibration function

W365413088

Esc

Enter

Speed
sensor

Main pump

(CAN bus)

Engine

Injection
pump

Governor
motor

Main valve

Bucket confluence

Swing pripority

Pressure sensor

Controller

Servo

Pressure sensor

（

Engine speed signal

）

（

Control signal

）

（

Control signal

）

R. Travel signal

L. Travel signal

Boom UP signal

Boom DOWN signal

Arm IN signal

Arm OUT signal

Bucket DIG signal

Bucket DUMP signal

Swing signal

Fuel control dial

Fig. 4-195

4-189

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Function

Enter the maximum engine speed for each
working mode as a criteria for engine speed
control.

Operation

1. Auto calibration of engine speed requires

starting the engine.

2. Call the interface of System Information

and select Throttle Installation Aid.

A. Turn the fuel control dial to position 1.

B. Press the key [F4] to start speed cali-

bration process.

C. Turn the fuel control dial after calibra-

tion.

D. Repeat step (2) to finish calibration of

speed at all positions.

E. Press the key [F5] or [ESC] to end

calibration.

XP2051203013

n/min

AUTO

rpm

Throttle Help Info

Current Gear N

：

Engine Speed rpm

：

Gear Position V

：

Throttle Position V

：

Fig. 4-196

4-190

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

4.10.10 System parts and components

1) Pump pressure sensor

Operation

●

The illustration on the right shows the rela-
tionship between the pressure acting upon
the sensor and the output voltage.

ZX335-1002067

Ӵᛳ఼䕧ߎ⬉य़

(V)

⊍य़࡯

(MPa)

W365-1304208

Connector

Housing

Pressure joint

Connection Diagram

Terminal No.

Signal Name

Power (+5V)

Ground

Output

Fig. 4-197

Fig. 4-198

4-191

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

Operation

●

The illustration on the right shows the rela-
tionship between the pressure acting upon
the sensor and the output voltage.

2) Pilot pressure sensor

W365-1304208

Connector

Housing

Pressure joint

Connection Diagram

Terminal No.

Signal Name

Power (+5V)

Ground

Output

ZX335-1002067

Ӵᛳ఼䕧ߎ⬉य़

(V)

⊍य़࡯

(MPa)

Fig. 4-199

Fig. 4-200

4-192

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

3) Engine speed sensor

Function

●

Engine speed sensor is mounted on the gear ring of

ywheel. It calculates the number of gear

teeth passing before the sensor and sends the result to the controller.

Note:

If the engine speed sensor has not been tightened to the speci

c torque, it may fail to pro-

duce signal. Always tighten the engine speed sensor to the speci

c torque.

ZX335-1002070

Fig. 4-201

4) Engine oil pressure switch

W365413089

Fig. 4-202

(1) Pressure detector

(2) Connector

Function

Engine oil pressure switch is mounted on the
delivery pipe of engine oil

lter. It detects en-

gine oil pressure and sends generated pres-
sure signal or alarm signal to the controller.

4-193

Structure and Functions

SY365(B)H-9 Crawler Hydraulic Excavator

5) Fuel level sensor

ZX215-1002246

Fig. 4-203

(1) Float

(2) Lever

(3) Shell

(4) Connector

Function

Signal from the sensor will be collected by the controller and displayed on the monitor. Resis-
tance output sensors like hydraulic oil temperature sensor, fuel level sensor and coolant tempera-
ture sensor send signal to the controller. The controller collects, process and calculate voltage
signals and converts it into related information that will be displayed on the monitor.

Speci

cations

Electrical parameters:

●

Total resistance: 100

●

Tolerance:

●

Upper limit: Ru

≤

9.6

●

Lower limit: Rd

≥

●

Variation: Nonlinear

●

Max. input volt: 12VDC

Mechanical parameters:

●

Rotor angle: 105

●

Vertical distance between upper and lower limits of the

oat (measurable range of

uid level):

500 mm

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