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CONTROL SYSTEM
2-36
TNV Application Manual
Engine control - General
Self-holding of the E-ECU power
The E-ECU saves engine logs including faults and running hours in the internal EEPROM. And it has a
power self-holding feature that allows the power supply to be held until the engine logs are completely saved
in EEPROM.
The power self-holding feature also allows the E-ECU to move the EGR valve to open a bit from the full-
close position when the key switch is turned off, preventing the valve from sticking while the engine is at rest.
To implement the power self-holding feature, the main relay and the rack actuator relay must be connected
as shown in
This feature can also be activated through CAN communication. See CAN communication specifications for
details.
Start control
The engine start sequence is shown in the figure to the right. The E-ECU performs rack self-diagnostics directly after
power on. A t this time, the starter relay prevents the starter motor from starting until the diagnostic is completed.
Next, when ON-glow control is alive (default), the time of energization of the starting aid relay is adjusted according
to the coolant temperature. The preheat lamp should illuminate while ON-glow control is in progress.
After ON-glow control is complete, the E-ECU waits until the key switch is moved to the START position.
When the key switch is moved to START or the engine speed reaches 240 min
-1
, rack position control on
start takes place to move the rack to a predefined position.
Having detected that the engine speed reaches 600 min
-1
, the E-ECU goes to speed control mode. In this
mode, the rack position is controlled so that the engine runs at a speed that matches the speed command
from the accelerator.
When the engine speed is reduced to less than 240 min
-1
or the key switch is turned off, the engine will stop.
Figure 2-24
S
TART
ON glow control (option
a
l)
R
a
ck po
s
ition control on
s
t
a
rt
S
peed control
Key
a
t
S
TART po
s
ition?
Engine
s
t
a
rted?
R
a
ck
s
elf-di
a
gno
s
tic
s
00_Electronic_Control_System.book 36 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...