Kubota WG1605, Service Training

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KUBOTA ENGINE AMERICA
Service Training
Feedback Control (Closed Loop)

Orange line is air fuel ratio as controlled by the ECU based on O
2
sensor
feedback. Oxygen sensor is sensing mixture and providing feedback.

WG1605 is in “Open Loop” for one minute after start up (predetermined
fuel mixture, not controlled by oxygen sensor), then is controlled by closed-
loop mode for all operating parameters.
Theoretical
air/fuel ratio
Lean Zone
Rich Zone
Oxygen (O
2
) Sensor: