2025-10-02 17:38 UTC
@TechConnectify
Yes, the ECU causes it, but only because the way the lambda sensor works.
The algorithm is simple: if lambda is below 1 (rich) decrease fuel amount till lambda passes 1 (lean). Then start increasing fuel till lambda goes under 1 again.
ECU cannot command "stay at lambda 1", since the sensor cannot measure that value and there is no valid feedback.
Replies (1)
-
@TechConnectify@mas.to 2025-10-02 20:30
@kwahoo Respectfully, I think you're confusing the algorithms necessary for narrowband sensors with those in use with a wideband sensor. Your original premise is that the engine should not need to oscillate between rich and lean based on the graph you have found. But that graph does not address the underlying chemistry of the reactions which take place in the catalyst. Narrowband feedback systems produced the necessary oscillations basically as a side-effect of how they worked.