Technical data
Fuel System
chap. 4
4-2
Release 00 2002-09
Atlantic 500
FUEL TANK AND PUMP
EMS FUEL INJECTION SYSTEM
The fuel injection system used is of the integrated fuel injection and ignition type.
Fuel is injected indirectly into the manifold by means of the electroinjector.
Fuel injection and ignition are timed on a 4-stroke cycle via a phonic wheel
keyed to the cam shaft control and a
reluctance variation sensor.
Fuel supply and ignition are controlled in relation to the engine revolutions and the opening of the throttle control.
Further corrections are carried out on the basis of the following parameters:
- Coolant temperature
- Air intake temperature
- Environmental pressure
The system carries out a idling supply correction on a cold engine via a stepper motor inserted on to a by-pass
circuit of the throttle valve. The control unit controls the stepper motor and the timing of the injector opening, thus
guaranteeing idling stability and correct fuel supply.
Under all working conditions, fuel supply is controlled by modifying the injector opening time.
Petrol supply pressure is kept constant on the basis of environmental pressure.
The supply circuit is composed of:
- Fuel pump
- Fuel filter
- Injector
- Pressure regulator
The pump, filter and regulator are inserted into the fuel tank via a single support.
The injector is connected by means of two snap-connector tubes. This allows continuous circulation and avoids the
risk of fuel overheating. The pressure regulator is situated at the end of the circuit. The fuel pump is controlled by
the EMS control unit; thus guaranteeing vehicle safety.
The ignition circuit is composed of:
- H.V. coil
- H.V. cable
- Shielded cap
- EMS control unit
- Spark plug
The EMS control unit controls ignition with optimum advance, at the same time guaranteeing 4-stroke cycle timing
(ignition only during compression phase).
The EMS fuel injection-ignition system controls the working of the engine by means of a preset programme.
Should certain entry signals fail, an acceptable working of the engine is still guaranteed in order that the user may
reach a repairs centre.
Obviously, this will not happen if the revolutions signal fails, nor if there is an anomaly in the control circuit:
- Fuel pump
- H.V. Coil
- Injector