Bedienungsanleitung Volvo XC70 - 2006 (Seite 161 von 211) (Englisch)

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Fuel/emissions systems

Evaporative control system

The car is equipped with an evaporative control system, which prevents

gasoline vapor from being released into the atmosphere.

The system consists of a fuel tank with filler pipe and cap, two rollover

valves, a Fill Limit Vent Valve (FLVV), vapor vent lines, a charcoal

canister, a purge line, and a purge control valve and engine connections.

In addition, there is a pressure sensor connected to the fuel tank and a

filter-protected Canister Close Valve (CCV) on the atmospheric side of

the canister, for system diagnosis.

The gasoline vapor is channeled through the rollover valves and the

FLVV via the vapor vent lines into the charcoal canister, where it is

stored. When the engine is started, the gasoline vapor is drawn from the

charcoal canister to the engines air intake system and into the combus-

tion process.

NOTE:

• Overfilling the fuel tank can cause damage to the evaporative control

system.

• If the fuel filler cap is not closed tightly or if the engine is running

when the car is refueled, the Malfunction Indicator Lamp may

indicate a fault.

• During a transitional period, a small number of service stations may

still have fuel nozzles that are not compatible with the fuel filler neck

on cars equipped with the evaporative emission control system

mandated by the U.S. Environmental Protection Agency and the

California Air Resources Board. If you experience difficulties in

refueling your vehicle, please ask the gas station attendant for

assistance.

CAUTION:

Fuel must not be siphoned from the fuel tank. This will damage the

evaporative emission control system.

Fuel system

The fuel system continually compensates for variation in engine load,

speed and temperature. A mass air flow sensor continuously measures

the inducted air and makes rapid adjustments for changes in air tempera-

ture and density, to balance fuel economy, emissions, and engine power

requirements.

Heated oxygen sensor

This is an emission control system designed to reduce emissions and

improve fuel economy. The heated oxygen sensor monitors the composi-

tion of the exhaust gases leaving the engine. The exhaust gas analysis is

fed into an electronic module. This adjusts the air/fuel ratio to improve

combustion and reduce the three major pollutants (hydrocarbons, carbon

monoxide, and oxides of nitrogen (NOx)) via a three-way catalytic

converter.

Crankcase ventilation

The engine is provided with positive crankcase ventilation which

prevents crankcase gases from being released into the atmosphere.

Instead, the crankcase gases are routed to the intake manifold and

cylinders.

PremAir®

On the surface of the radiator in the engine compartment, there is a

special coating called PremAir®. PremAir® works as a catalytic

converter, converting most of the ozone passing through the radiator into

oxygen, thereby reducing harmful ground-level ozone.

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Volvo XC70 - 2006 Seite 161

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