The Common Rail system makes it possible to carry out a pre-injection (pilot injection) before T.D.C. with the advantage of reducing the consequences of the pressure in the combustion chamber and reducing the combustion noise typical of direct injection engines.The Engine Management Node controls the quantity of fuel injected, regulating the line pressure and injection times.The Engine Management Node processes the following information to control the quantity of fuel to inject:
engine rpm
coolant temperature
supercharging pressure
air temperature
intake air quantity
battery voltage
diesel pressure
accelerator pedal position.
Diagram showing information entering/leaving the Engine Management Node
Self-diagnosisThe control unit self-diagnostic system checks the signals coming from the sensors comparing them with the permitted parameters.Siganalling of faults during statingwarning light on for 4 seconds indicates test stagewarning light off after 4 seconds indicates no fault with components that can alter values set out by pollution control regulationswarning light on after 4 seconds indicates fault.Signalling of faults during operationwarning light on indicates faultwarning light off after 4 seconds indicates no fault with components that can alter values set out by pollution control regulations.Recoveryfrom time to time the Engine Control Node defines the type of recovery according to the components that are faulty.the recovery parameters are managed by components that are not faulty.Lancia Code recognitionWhen the Body Computer receives an ignition ON signal, it communicates wtih the Engine Control Node to allow start-up. For vehicles with Passive Entry (See group ) 55 ELECTRICAL EQUIPMENT
Fuel temperature controlWhen the temperature of the fuel, measured by the sensor on the recirculation manifold, is 110°C, the Engine Management Node operates the pressure regulator to reduce the line pressure (it does not alter the injection times).
Engine coolant temperature controlWhen the engine coolant temperature is above 105°C, the Engine Management Node:
controls the cooling fan via the fan control interface
switches on the coolant temperature warning light.
Control of amount of fuel injectedOn the basis of the signals coming from the sensors and the values stored, the Engine Management Node:
controls the pressure regulator
alters the "pilot" injection time up to 3000 rpm
alters the "main" injection time.
Idle speed checkThe Engine Management Node processes the signals coming from the various sensors and regulates the quantity of fuel injected:
controls the pressure regulator
alters the injector injection times.
Within certain limits the speed takes the battery voltage into account.
Fuel cut-off during decelerationDuring the accelerator pedal release stage, the Engine Management Node implements the following logics:
cuts off the supply to the injectors
partly reactivates the supply to the injectors before the idle speed is reached
controls the fuel pressure regulator.
According to the signals received from the sensors, the Engine Management Node controls the idle speed torque:
alters the quantity of fuel injected by the individual injectors (injection time).
Check on irregular operationThe Engine Management Node processes the signals received from the various sensors and determines the quantity of fuel to inject through:
the pressure regulator
the injector opening time.
Exhaust fumes control during accelerationWhen there is strong acceleration, according to the signals received from the flow meter and the engine rpm sensor, the Engine Management Node determines the optimum amount of fuel to inject:
controls the pressure regulator
alters the injector injection times.
Exhaust gas recirculation control (E.G.R.)On the basis of the engine load and the signal from the accelerator pedal potentiometer, the Engine Management Node limits the quantity of intake air, implementing the partial intake of exhaust gases, through:
the adjustment of the opening of the E.G.R. solenoid valve
Maximum torque limit controlAccording to the rpm level, the Engine Control Node calculates the following in pre-defined maps:
the torque limit
the permitted fumes (limit).
It compares this minimum values and corrects them with other parameters:
coolant temperature
engine rpm
vehicle speed
and controls the quantity of fuel to be injected (pressure regulator - injectors).
Maximum speed limit controlDepending on the rpm, the Engine Management Node implements two operating strategies:
at 5000 rpm it cuts off the fuel reducing the line pressure
beyond 5400 rpm it deactivates the auxiliary pump and the injectors.
Heater plugs check
start-up
post-starting
applies a timer to the glow plug preheating control unit based on engine temperature.
Air conditioning system start of operation checkThe Engine Management Node controls the air conditioning compressor:
switching it on/off when the switch is pressed
switching it off momentarily (about 6 secs) in the case of strong acceleration or a request for maximum power.
Auxiliary fuel pump checkIrrespective of the engine speed, the Engine Management Node:
supplies the auxiliary fuel pump with the ignition ON
cuts off the auxiliary pump supply if the engine is not started within a few seconds.
Cylinder position checkDuring each revolution of the engine the Engine Management Node recognizes which cylinder is in the explosion stroke and controls the injection sequence at the appropriate cylinder.
Main injection advance and operation check
Injection pressure closed cycle checkOn the basis of the engine load, determined by processing the signals from the various sensors, the Engine Management Node controls the regulator to produce optimum line pressure.
Electrical balance checkAccording to the battery voltage, the Engine Management Node alters the idle speed:
increases the injector injection times
modulates the line pressure.
The Engine Management Node processes the signal from the supercharging pressure, at the various engine operating speeds and determines the quantity of fuel to inject:
controls the pressure regulator
alters the injection time
regulates the turbine geometry to ensure optimum performance in all operating conditions.
Fan controlAccording to coolant temperature and coolant pressure in the air conditioning system, the Engine Management Node communicates with the fan control interface to provide enablement for:
solenoid valve engagement at first or second speeds.
Check on throttle closing when switching offIn order to prevent the engine shuddering when it is switched off, the Engine Management Node controls the immediate closure of the inlet throttle. The throttle remains open in all other operating conditions.
Cruise control system checkDepending on the position of the control lever, the Engine Management Node directly controls the quantity of fuel injected to control and maintain the vehicle speed memorized.A warning light on the dashboard activated by the Engine Control Node indicates system operation or deactivation status.Cruise control is temporarily disabled:
by operating the brake
by operating the clutch;
the recall button returns to the stored speed.Cruise control is not disabled when the accelerator is pressed (e.g. to overtake) and automatically restores the vehicle to the set speed as soon as the accelerator is released.The ASR function (antispin) takes precedence over cruise control for safety reasons.
