Two-Sensor Control

Two-Sensor Control, Basic System Diagram:

O2 Sensor Signal Upstream Of TWC:

1. O2 sensor signal upstream of TWC
a) Voltage threshold for rich - lean transition (b) or lean - rich transition (c)
2. Lambda control without correction variable
3. Lambda control with correction variable (d), time shift (+TV) in rich direction
4. Lambda control with correction variable (e), time shift (-TV) in lean direction