Question

What is the use of the lambda sensors in the catalytic converter?

(a) To keep excess air ratio within a range

(b) To keep the flow rate of constant air

(c) To keep the exhaust pressure constant

(d) To keep the exhaust temperature constant

The question was posed to me during an online interview.

This intriguing question originated from Engine Electronics topic in section Automotive Electronics, Engine Performance Parameter & Testing of Automobile Engines of Automobile Engineering

Answer 1

Right choice is (a) To keep excess air ratio within a range

Easy explanation: In catalytic convertor, the lambda sensors are used to keep excess air ratio within a range. The catalytic converter is the emission control device.