Open loop: Difference between revisions

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(New page: Open loop fueling is used in cars equipped with narrow band O2 sensors to determine the injector on time w/o using feedback from the sensors. Generally, it is based on the amount of air me...)
 
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Open loop fueling is used in cars equipped with narrow band O2 sensors to determine the injector on time w/o using feedback from the sensors. Generally, it is based on the amount of air metered by the [[Mass Air Flow]] sensor.
Open loop fueling is used in cars equipped with narrow band O2 sensors to determine the injector on time w/o using feedback from the sensors. Generally, it is based on the amount of air metered by the [[mass air flow]] sensor, and whether the desired AFR is stoichiometric (lambda=1) or not.


Motronic will go open loop under any of the following conditions
Motronic will go open loop under ''any'' of the following conditions


# At start
* At motor start
# When load > RLLRUN + TRAB delay time
* When load > RLLRUN + TRAB delay time
# When req lambda != 1
* When req lambda != 1


Note that there are other open loop conditions, such as during idle under certain circumstances, and at fuel-cutoff during overrun.
Note that there are other open loop conditions, such as during idle under certain circumstances, and at fuel-cutoff during overrun.

Latest revision as of 20:00, 29 December 2009

Open loop fueling is used in cars equipped with narrow band O2 sensors to determine the injector on time w/o using feedback from the sensors. Generally, it is based on the amount of air metered by the mass air flow sensor, and whether the desired AFR is stoichiometric (lambda=1) or not.

Motronic will go open loop under any of the following conditions

  • At motor start
  • When load > RLLRUN + TRAB delay time
  • When req lambda != 1

Note that there are other open loop conditions, such as during idle under certain circumstances, and at fuel-cutoff during overrun.