Acura 2009 RDX Manuel d'utilisateur télécharger pdf (Page 407)

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The United States Clean Air Act

sets standards for automobile

emissions. It also requires that

automobile manufacturers explain to

owners how their emissions controls

workandwhattodotomaintain

them. This section summarizes how

the emissions controls work.

Scheduled maintenance is on page

.

The burning of gasoline in your

vehicle’s engine produces several by-

products. Some of these are carbon

monoxide (CO), oxides of nitrogen

(NOx), and hydrocarbons (HC).

Gasoline evaporating from the tank

also produces hydrocarbons. Con-

trolling the production of NOx, CO,

and HC is important to the environ-

ment. Under certain conditions of

sunlight and climate, NOx and HC

react to form photochemical ‘‘smog.’’

Carbon monoxide does not contri-

bute to smog creation, but it is a

poisonous gas.

Your vehicle has a positive

crankcase ventilation system. This

keeps gasses that build up in the

engine’s crankcase from going into

the atmosphere. The positive

crankcase ventilation valve routes

them from the crankcase back to the

intake manifold. They are then

drawn into the engine and burned.

As gasoline evaporates in the fuel

tank, an evaporative emissions

control canister filled with charcoal

adsorbs the vapor. It is stored in this

canister while the engine is off. After

the engine is started and warmed up,

the vapor is drawn into the engine

and burned during driving.

The onboard refueling vapor

recovery (ORVR) system captures

the fuel vapors during refueling. The

vapors are adsorbed in a canister

filled with activated carbon. While

driving, the fuel vapors are drawn

into the engine and burned off.

In Canada, Acura vehicles comply

with the Canadian emission

requirements, as specified in an

agreement with Environment

Canada, at the time they are

manufactured.

334

The Clean Air Act

Crankcase Emissions Control

System

Evaporative Emissions Control

System

Onboard Refueling Vapor

Recovery

Emissions Controls

Technical Information

403

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