Discussion
Arrange the closed loop fuelling sequence in order:
1. The lambda sensor detects residual oxygen in the exhaust
2. Its output switches as the mixture crosses stoichiometric
3. The controller adjusts the injected fuel quantity
4. The mixture is held hunting about the catalyst window
Select the correct sequence.
Answer: C
The loop is a switching controller rather than a proportional one, which is why the mixture oscillates about stoichiometric rather than settling on it. That small oscillation is actually useful, since it keeps oxygen storage in the catalyst cycling.
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