11. Electrical System
168
Engine Control Unit (ECU) Operating
Conditions
1. Starting the engine
1) To set the reference temperature for determining whether
or not to perform preheating, the ECU sets the lowest
temperature among the coolant temperature, fuel
temperature, intake air temperature, and oil temperature
as the reference temperature.
2) To set the reference temperature for determining the
amount of fuel, the ECU sets the engine coolant tempera-
ture as the reference temperature.
3) After determining a suitable amount of fuel for starting the
engine, the ECU supplies the fuel to the engine and uses
the crankshaft speed sensor to measure the engine rpm
signal.
2. Generator operation
1) Data required for operating the generator is calculated,
such as CAN communication data transmitted from the
generator controller and the engine speed.
3. Fault diagnostics and restricted operation
1) In the event of a fault in the engine, certain information is
displayed on the control panel by CAN communication.
2) Sensor malfunction: Certain alternate values are used in
the event of a malfunction in any of the sensors.
3) Limited output: The amount of fuel delivered to the engine
is limited depending on the type of fault. There are a total
of two stages, normal and abnormal, and the amount of
fuel is significantly limited in the abnormal stage.
4) Diagnostic information display: Data regarding faults
which have occurred is provided to the operator to ensure
safe operation.
4. Operating record
1) Operation-related information is recorded in the engine
control unit.
2) Information such as the fuel consumption rate, engine
operating time, and engine control unit operating time is
recorded in the engine control unit.
3) Information can be monitored using the ECU diagnostic
system.
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