Volvo 2009 XC90 Owner's Manual download pdf (Page 276)

11 Specifications

Catalytic converter

275

General

The purpose of the catalytic converter is to

purify exhaust gases. It is located in the flow of

exhaust gases close to the engine so that it

quickly reaches operating temperature. The

catalytic converter consists of a monolith

(ceramic or metal) with channels. The channel

walls are lined with a thin layer of platinum,

rhodium and palladium. These metals act as

catalysts, i.e. they participate in and accelerate

a chemical reaction without being used up

themselves.

Lambda-sond

oxygen sensor

The Lambda-sond is part of a control system

intended to reduce emissions and improve fuel

economy.

An oxygen sensor monitors the oxygen content

of the exhaust gases leaving the engine. This

value is fed into an electronic system that con-

tinuously controls the injectors. The ratio of fuel

to air directed to the engine is continuously

adjusted. Together with the three-way catalytic

converter, these adjustments create optimal

conditions for efficient combustion of the

harmful emissions (hydrocarbons, carbon

monoxide and nitrous oxides).

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Volvo 2009 XC90 Owner's Manual Page 276