estimating air fuel ratio by utilizing a gas analyser?

Question

Hi guys,

I have access to a 4 exhaust emission analyzer. Assuming that it can measure HC,CO,CO2,O2 in parts per million, how can i calculate the corresponding air to fuel ratio?
Would really appreciate if anyone can recommend me additional website or books to refer to.

Thanks a lot!

Answer 1

We know that fresh air is 21% Oxygen and we know that the average gasoline molecule is C8H18. From the CO and CO2 concentration you can establish how much gasoline was burnt per unit of exhaust gas. By measuring the Oxygen level you can determine excess`air was present. Convert moles to weight and calculate the ratio.

Answer 2

that is too before now for me to recall the figures, yet often the quantity of air is variable' that is distinctive at distinctive aspects of the working cycle of the gadget. Inlet air throttling is executed employing variable inlet instruction manual vanes that open or close, to make the flowpath larger or smaller. this form of effective tunes the quantity of skill available -as an occasion at initiate the instruction manual vanes are closed, yet as a results of fact the revs enhance, the instruction manual vanes will open and permit lots greater air into the combustion chamber.