Discussion
Petrol engine emissions against air-fuel ratio.
| Air-fuel ratio | Lambda | CO | HC | NOx |
|---|---|---|---|---|
| 12.5 | 0.85 | Very high | High | Low |
| 14.7 | 1.00 | Moderate | Moderate | High |
| 15.5 | 1.05 | Low | Low | Highest |
| 18.0 | 1.22 | Very low | Rising | Low |
Why can no single air-fuel ratio minimise all three pollutants at once?
Answer: A
The map runs in opposite directions for the incomplete combustion products and for the thermal nitrogen oxides. It is exactly why the three-way catalyst was developed, since it treats all three at one point rather than trading them.
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