Hyundai Yanmar 3TNV82A-B, Руководство пользователя

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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
Figure 2-4 .
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
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