Section 75
00-02-0522
04-06-11 -
34 -
Using iGUARD with ECU Controller Engines
In most Tier 2 compliant engines, the manufacturers have elected to move to electronic
controls to meet the exhaust emissions requirements mandated by the various air quality
boards. These controls allow for very precise control of the engine to limit emissions to the
legal level or below. One side effect is that there no need for the user to supply any senders
when using the iGUARD with a J1939 Engine Control Unit or Electronic Control Unit (ECU)
equipped engine, and that there is a large amount of useful data available from the engine
ECU.
In genset applications, the simplest implementation is to treat the engine ECU like a fuel
solenoid in a non-ECU equipped engine.
When there is a call to run:
1.
The iGUARD closes the ECU enable relay, applying power or logic enable to the ECU.
2.
The iGUARD waits a short time for the ECU to power up and stabilize.
3.
The iGUARD communicates with the ECU to see if there are any "Wait to start" conditions,
such as:
a. Important variables not at their "ready to start values".
b. The ECU is sending out a Wait-to-Start message.
4
. If there are no "Wait to start" conditions, the iGUARD begins a normal start cycle, or if there
are one or more "Wait to Start" signals, the iGUARD waits for them to clear before proceeding.
To use the iGUARD controller with an ECU equipped engine you must make the following
selections in the programming stacks:
In the miscellaneous parameters stack:
Select the type of ECU (J1939).
Select the manufacturer of the engine/ECU.
In the relay programming stack:
Program a relay for "ECU enable". (relay 7 is default)
On SAE-J1939 equipped engines, the data connection will read any available status
messages, and if there is a wait to start message, the iGUARD will delay cranking until the
engine ECU clears that message.
The ECU broadcasts the data over the J1939 data connection and the iGUARD uses the
following parameters to operate:
Oil
pressure
Coolant
temperature
Phase-out
/ Discontinued
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