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Title: Oxygen sensor signal frequency Post by: Buddhasteph on June 22, 2013, 02:48:24 AM Hi,
I am looking for information about the injection regulation and especially the link between the oxygen sensor signal and the injection timing. I know how the sensor works in terms of electronics, signal response,... I think I have understood that most ECU control fuel/ air ratio in closed loop through a PID regulation scheme but: Why does this regulation lead to a variating ratio with a specific frequency, which seems to be constant and about 1Hz? I observed this by looking at my probe signal over time on my Alfa 147 (motronic ME 7.3.4) and I though that the ECU Could follow a ratio of 1 with a faster response, so with a higher frequency? What do you guys think? Steph |