2889406 - E5030 PETROL ENGINE ELECTRONIC MANAGEMENT - Description (GPOWER)
Description
The petrol fuel system is managed by a control
unit, which controls both the ignition and the fuel injection.The LPG fuel system is managed by another
control unit which controls the LPG injection and the logic for
the LPG/petrol supply changeover, which takes place automatically
or manually via the specific changeover button located on the dashboard.The two control units are connected to each
other by a specific high-speed CAN line, which permits optimum engine
management under all operating conditions and with any type of fuel
supply.On the basis of the signals received
from several sensors, the two control units, which share signals
from some sensors, control the respective connected actuators, managing
the following system:
- petrol supply;
- LPG supply;
- air supply system;
- engine cooling;
- fuel vapour recirculation;
- control of combustion - Lambda sensors;
- control of exhaust with catalytic silencer.
This version of the system also includes
the EOBD (European On Board Diagnosis) system - conforming to Directive
98/69/CE (EURO 3) - permits continuous diagnosis of the components
- relating to petrol operation - associated with emissions, and
by the warning light coming on, indicates any deterioration of these
components.Among other things, the system diagnoses:
- the catalytic converter, which in the case of a malfunction
does not convert the pollutants produced by the engine;
- the Lambda sensors (oxygen sensors);
- the lack of combustion, so unburnt fuel reaches the catalyzer
where the thermal conversion reactions cause a sudden increase in
temperature, damaging the catalyzer.
The LPG system is additional to the basic
system, and does not alter the operation of the basic system under
any operating conditions.The specific control unit manages the LPG
injection, of the phased sequential type, and the activation of
the LPG cut-off solenoids, and also the LPG pump; it also controls
the deactivation of the petrol pump.Injection is direct, by driving the specific
injectors of the LPG system. - The ignition advance is regulated
by sending to the 'basic' engine management control unit the change in
advance to be added to that applied during operation on petrol.
This communication takes place via the CAN line present between
the two control units.All the other engine control functions,
including ignition advance, are left to the 'basic' engine management
control unit. | The engine normally runs on LPG. |
If the LPG runs out (pressure below a certain
value, the LPG control unit automatically changes over to petrol
supply, and the appropriate warning light comes on.Once the LPG has been refilled, the system
automatically switches back to running on LPG. | During starting and after refilling
with LPG the engine continues to run on petrol for several seconds
to ensure that the pump, the injectors and the specific manifolds
are working properly and for diagnostic reasons for certain components |
The special switching button in the dashboard
makes it possible to switch manually to running on petrol: in such
a case both the green LED on the button and the special warning light
in the instrument panel come on.When the button is pressed again, operation
returns to LPG. | The manual switching from petrol
to LPG and viceversa should not be done whilst starting the engine.
In addition, this only takes place if the engine speed is below
a certain value. |
For more details, especially on LPG operation,
Characteristic
of working principle 1058 CNG FUEL SYSTEM
.
The system is also controlled by means of
four relays located in the fuse and relay box in the engine compartment
near the actual control unit. The supply lines for the two control units
and the various system components (sensors and actuators) are protected
by a special maxifuse and three other fuses also located in the
above mentioned box.