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Group 23 EDC III
Design and operation
Calculation of fuel quantity
The amount of fuel injected into a cylinder is calcula-
ted by the control module. The calculation gives the
amount of time the fuel valve is closed (as fuel is in-
jected into the cylinder when the fuel valve is closed).
The parameters that determine the amount of fuel in-
jected are:
•
Requested RPM
•
Engine protection functions
•
Temperature
•
Charge air pressure
Cylinder balance
When idling, the control module can provide the cylin-
ders with different amounts of fuel. This makes the
engine idle more evenly. At higher RPM, all cylinders
receive an equal amount of fuel.
Diagnostic function
The EDC III system has an internal diagnostic func-
tion that makes it possible to detect faults in the engi-
ne and sensor.
The role of the diagnostic function is to detect and lo-
calize disruptions in the EDC III system, protect the
engine and ensure that the machine remains in wor-
king order during serious disturbances.
If a disturbance arises, the diagnostic indicator on the
indicator panel begins blinking. When the diagnosis
button is pressed, an error code is given as guidance
for any fault detection. The diagnostic function can be
read out via the display using the PC diagnostics pro-
gram.
Idle adjustment (low idle)
Idle can be adjusted to a value between 600 and
1200 RPM.
