Volvo Engine Electronic Diesel
Control?
EDC 4 (Electronic Diesel Control)
is an electronic system with CAN (Controller Area Network) or potentiometer
communications for diesel engine control. The system includes fuel management
and diagnostic functions.
Overview
The system includes sensors,
control unit and an engine speed regulator. The sensors send input signals to
the control unit, which in turn governs the injection pump control rack by
means of an actuator in the engine speed regulator.
Input
signals
The control unit receives input
signals about engine operating conditions from the following components:
1. rpm sensor, camshaft
2. coolant temperature sensor
3. charge pressure sensor
4. oil pressure sensor
5. fuel temperature sensor
6. coolant level sensor (the
function is implemented in the control unit as standard, but no sensor is
supplied with the engine as a standard feature.)
Output
signals
The control module uses the input
signals to control the following components:
1. engine speed regulator (with
position sensor for the control rack and actuator)
2. electric air preheating
(option)
Information from the sensors
provides exact information about current operation conditions and allows the
processor to calculate the correct fuel volume, check engine status etc.
Diagnostics
function
The task of the diagnostics
function is to detect and localize any malfunctions in the EDC 4 system, to
protect the engine and to ensure operation in the event of serious malfunction.
If a malfunction is detected,
notification is made either by the diagnostic function, by warning lamps or via
the CAN network. Pressing the diagnostic button will provide the operator with
a fault code for guidance in any fault-tracing. Fault codes can also be read
off via the CAN interface or using the Volvo VODIA tool (including Penta EDC 4
software) at an authorized Volvo Penta workshop.
If there is a serious
malfunction, the engine is shut down altogether. Here too, fault codes can be
flashed out via the diagnostics connector, the CAN interface or with the Volvo
VODIA tool (including th Penta EDC4 software) at an authorized Volvo Penta
workshop.
Instruments
and Controls
Gauges
The engines are not supplied with
instruments and controls. The choice of instruments and controls is up to the
customer. Below is a description of the functions available.
A. Rpm-potentiometer (Throttle
control)
B. CAN interface SAE J 1939
C. VODIA input
D. Droop switch
E. 1500/1800 switch
F. Diagnostics button
G. Tachometer
H. Warning lamp, oil pressure
J. Diagnostics lamp
K. Warning lamp, coolant
temperature
L. Fuse15A
M. Main switch
N. Battery (orange indication)
(24/12 V)
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