312001100 - E5070 PARTICLE FILTER SYSTEM - DESCRIPTION

DESCRIPTION

An electronic control system supervises and governs all engine parameters to optimise performance and fuel consumption by means of a real-time response to different operation conditions.    See E5050 DIESEL ENGINES ELECTRONIC MANAGEMENT To conform with the most recent pollution control regulations (EURO 4), the most recent version of electronic management which includes new components and a swirl solenoid valve and DPF particle filter has been adopted.The DPF particle filter (Diesel Particulate Filter) is a mechanical filter, inserted in the exhaust pipes which traps the carbon particles present in the exhaust gases on diesel engines. The filter makes it possible to almost totally eliminate the emission of carbon particles in line with current legislation.This regeneration is carried out automatically by the engine management control unit on the basis of information provided by dedicated sensors and if the following usage conditions are satisfied: vehicle speed above 40 Km/h for at least 15 minutes and particle mass below 200%.

During the normal usage of the vehicle, the engine management control unit records a series of data related to usage (period of usage, type of journey, temperatures reached, etc.) and empirically calculates the quantity of particulates accumulated in the filter.

The filter is an accumulation system and should be periodically regenerated (cleaned) by burning the residual carbon particles.The following phenomena may occur during the regeneration: limited increase in the idle speed, activation of the fan, limited increase in fumes at high exhaust temperatures. These situations should not be interpreted as problems and have no adverse affect on the behaviour of the vehicle or on the pollution of the environment.The system has three warning lights in the instrument panel for signalling the accumulation status and operation of the filter.The "filter blocked" warning light is activated after a certain number of unsuccessful regenerations, i.e. the driving profile at that moment does not allow the automatic activation of the regeneration procedure.The EOBD warning light is activated if the accumulation level of 250% is exceeded memorizing the errors in the engine management control unit memory.If the "filter blocked" warning light does not go out, or the EOBD warning light is activated, it is vital to carry out the forced regeneration using the diagnostic equipment (Examiner).    Op. 0520G12 PARTICULATE FILTER (D.P.F.) - REGENERATION EXAMINER It is possible, during the filter regeneration stage, that the particulate being "washed" may pollute the engine oil.For this reason, the "minimum engine oil pressure" warning light is also used on engines with a DPF filter that flashes together with the message "Change the engine oil" in the display when the system detects that the engine oil has deteriorated to a certain extent, requesting an oil change in advance of the programmed one (managed by the control panel - Service function).The extent of the deterioration of the oil is not measured by a dedicated sensor, but calculated by an algorithm in the engine management control unit depending on: the number of DPF regenerations, kilometres (or miles) travelled, number of engine starting cycles, number of cold starts, average value of the oil temperature, etc.Two specific sensors inform the engine control unit about the operation of the particle filter:

• the differential pressure sensor constantly measures the difference in pressure between the inlet and outlet of the particle filter: this measurement makes it possible to determine the filter blockage level;
• the temperature sensor downstream of the catalyzer, located between the catalyzer and the particle filter, allows the engine management control unit to monitor the temperature of the exhaust gases downstream of the catalyzer and consequently an increase in temperature caused by catalytic combustion.

For more details,    See descriptions 1080B EXHAUST EMISSION CONTROL SYSTEM The system is also controlled by dedicated relays in the engine compartment junction control unit. Lines supplying the control unit and various system components (sensors and actuators) are protected by dedicated fuses that are also located inside the engine compartment junction unit.