Oxygen Sensors - Overview

The basic O2 sensor is designed to supply a fluctuating, ______ voltage "feedback" signal to the ______.

Why do we need an O2 sensor?

• To adjust the vehicle's suspension
• To keep the air/fuel ratio at 14.7:1 by mass

• To regulate the fuel injection system

The ideal air/fuel ratio is known as:

• Equilibrium ratio
• Perfect mix ratio
• Optimal blend ratio
• Stoichiometric ratio

What is a thermocouple?

• A thermocouple is a temperature sensor that generates a voltage using applied heat.

• A thermocouple is a cloud formation.

• A thermocouple has two wires.

• A thermocouple is a type of musical instrument.

The basic single wire sensor uses an impermeable electrolytic ceramic made of

• titanium nitride
• aluminum oxide
• silicon carbide
• zirconium dioxide

This is then stabilised between two gas permeable electrode ________

What happens when exhaust temperatures exceed 300˚C?

• Improved fuel efficiency
• Enhanced engine performance
• Reduced emissions
• A reaction takes place

When the exhaust temperatures exceed 300˚C, where does the reaction take place?

• In the exhaust manifold

• Within the sensor

The electrolyte becomes conductive and a small voltage is generated due to the difference in oxygen content outside the sensor (exposed to exhaust gas) compared to the amount of _______ inside the sensor dome

What factor determines the strength of the charge in the zirconia oxygen sensor?

• Number of oxygen ions passing through the ZrO2 electrolyte

• Temperature of the environment

• Pressure of the surrounding atmosphere

• Color of the zirconia sensor

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