CONTROL SYSTEM
2-40
TNV Application Manual
shows the engine speed control block diagram.
[Speed control]
The deviation of the actual engine speed (Nrpm) from the target engine speed (Nset) is used to determine
the target rack position (Rset) with PID control. The target rack position is the basis for providing torque
limitation or rack motion delay adjustment for transition control (described later).
[Rack position control]
The deviation of the actual rack position (Ract) from the target rack position (Rset) is used to determine the
target current (Iset) with PID control. To check that the control system of the Eco-governor works properly,
use the service tool to make sure that Ract is approximately equal to Rset while the engine is running.
[Current control]
The deviation of the actual current (Iact) from the target current (Iset) is used to determine the target PWM
duty ratio with PID control. Current control helps improve the motion responsiveness of the rack or facilitate
diagnostics of the rack solenoid
Figure 2-29
Engine speed control block diagram
Transition control
The Eco-governor delays the rack motion at engine start or during acceleration in order to minimize the
emission of black smoke. See
Figure 2-30
Transition control
PI-D
PI-D
Rack Position Sensor:Ract
Target Current
Iset
Nset
Target Position
Rset
Rack
position
Engine
speed
Solenoid
current
P
(Droop)
I
-D
Target
Speed
PID
PID
Solenoid
Pump
Engine
+
・Limit
・Delay
Current Sensor:Iact
Engine Speed Sensor:Nrpm
0
200
600
8
00
1000
1400
1200
400
C
u
t Exce
ss
F
u
el
S
peed min
-1
S
t
a
rting
Mech. Gov.
Acceler
a
tion
Mech. Gov.
Eco-Gov.
Eco-G
-Gov.
Eco-Gov.
F
u
ll Q
Injection Q
00_Electronic_Control_System.book 40 ページ 2006年5月29日 月曜日 午後2時12分
Summary of Contents for Yanmar 3TNV82A-B
Page 95: ...CONTROL SYSTEM 2 76 TNV Application Manual 00_Electronic_Control_System book 76...
Page 96: ...Appendix Standard harness 1 00_ _E fm 1...
Page 97: ...Appendix Standard harness 2 00_ _E fm 2...
Page 98: ...TNV Series service tool Operation Manual...
Page 132: ...32 7 Main Menu Figure 7 15 Data Logging Data Monitor Screen...
Page 145: ...7 Main Menu 45 Figure 7 27 System Installation Configuration Screen...