Description And Operation: Description

An electronic control system supervises and manages all engine parameters to optimize performance and fuel consumption by means of a real-time response to different operating conditions. The system is managed by a single control unit which controls both ignition and injection.

This version adopts a 1.3L turbo engine with MultiAir technology, a new electro-hydraulic valve management system which controls air and combustion directly. This ensures considerable advantages in terms of maximum power increase, torque improvement at low speed and reduction of fuel consumption and emissions.

Depending on the signals received from numerous sensors, the control unit manages the injectors connected to it, handling the following systems:

• fuel supply;
• air supply;
• accelerator pedal;
• engine cooling;
• control of combustion - oxygen sensors;
• control of exhaust with catalytic converter:
• fuel vapor recirculation;
• supercharging pressure adjustment;
• MultiAir solenoid valve management.

The throttle body is also controlled electronically by the control unit: the throttle opening is calculated according to a specific logic inside the Powertrain Control Module (PCM); the mechanical connection between the accelerator pedal and the throttle body is thereby eliminated.

This engine adopts the innovative MultiAir system for the intake valves: a piston, operated by a mechanical cam, is connected to the intake valve through a hydraulic chamber, controlled by an ON/OFF type, normally open solenoid valve. When the valve is closed, the oil in the hydraulic chamber acts as a solid body and sends the lifting command from the mechanical intake cam to the intake valves.

When the valve is open, the hydraulic chamber and the intake valves are disconnected; they no longer follow the intake cam, closing due to the force of the spring.

The system is also controlled by dedicated relay switches in the engine compartment junction unit. Lines supplying the control unit and various system components (sensors and actuators) are protected by dedicated fuses that are also located in the engine compartment junction unit.