PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 54 / 892

Emission check: this section of the manual describes operations and precautions to be followed to check
emissions.
EMISSION CONTROL SYSTEM
Crankcase gas recirculation: A system by means of which the gas generated in the crankcase re-
enters the inlet manifold, instead of being released to the atmosphere, in order to be burned inside the
combustion chamber.
Three-way catalytic converter: A device by means of which hydrocarbons (HC) and carbon monoxide
(CO) contained in exhaust fumes are oxidised, and Nitric oxides (NOx) are deoxidised by the monolithic
catalytic converter, thus minimising HC, CO and NOx emissions that are released into the atmosphere.
Closed-loop control system (EFI) (Electronic Fuel Injection): The closed-loop control system guar-
antees a suitable air-fuel ratio for the engine. It also guarantees optimum quantity of oxygen contained
in the exhaust fumes so as to obtain a high degree of purification of the three-way catalytic converter.
Electronic ignition timing control ESA (Electronic Spark Advance): Thanks to the electronic igni-
tion timing control based on signals sent by the various sensors, the computer controlling emissions
keeps the ignition timing constant at optimum levels, according to engine conditions.
Fuel closing in deceleration (Cut-off): Device that interrupts fuel supply during the deceleration phase
in order to reduce HC and CO emissions. System by means of which Nitric oxide (NOx) emissions are
minimised, thus allowing recirculation of exhaust fumes present in optimum quantity in the inlet manifold
according to engine conditions.
Fuel vapour emission check: System by means of which hydrocarbons (HC) released by the fuel tank
are absorbed by an activated carbon filter (CANISTER), thus preventing the emission of hydrocarbons
(HC) into the atmosphere.
HC: Hydrocarbons
CO: Carbon monoxide
NOx: Nitric oxides
Disposizione componenti
COMPONENT LAYOUT
1. Activated carbon filter
2. Vacuum switching valve for bleeding
3. Oil filler cap
4. Atmospheric opening
5. Activated carbon filter
6. VSV (vacuum switching valve) for EGR (exhaust gases recirculation)
7. EGR vacuum modulator
8. EGR (exhaust gases recirculation) valve
9. Throttle body
10. Bleed opening
Emission Controlo System
PORTER 1.3 16V
CO EM - 54