The Narrow Band Oxygen Sensor heater can be controlled using either switched or PWM mode. The method of control is adjusted from the Config View, Function Setup menu. 



Switched Mode


  • This is the most basic mode and switches the heater channel ON after the Post Start Lockout has finished. Same setup as below except Output Mode = Switched.

(This mode is not recommended)


Switched Mode (Table)


  • From Config View -> Functions, select the required Channel, either Heater 1 and 2 and open.
  • Select the Output Channel. In this example Sensor Heater 1 has been assigned to Auxiliary 4.
  • Select Driver Type (Normally Low Side).
  • Select Output Mode = Switched (Table). This puts the heater control in switched mode and allows a 3D table to control the switching conditions.


NOTE: The Output Mode set to "Switched" has the same effect as "Switched (Table)" 


  • Select Ok.
  • The setup is complete. Now move to the tuning view.



  • In the tuning view select Engine Functions -> Narrow Band Heater 1 Table. This table now controls to switching of Auxiliary 4 and in turn controls the Lambda Heater.


       Important Table Rules in switched:

       

       Table value of 100         = Output ON

       Table value of 0                = Output OFF

       Any other value                 = No change to the Output. This is user defined hysteresis. In the example below 50 is the value selected.



 



PWM Mode


  • Select the required Channel, either Heater 1 and 2 then open the menu.
  • Select the Output Channel. In this example Sensor Heater 1 has been assigned to Auxiliary 4.
  • Select Driver Type (Normally Low Side).
  • Select Output Mode = PWM. This puts the heater control in PWM mode and allows a 3D table to control the duty cycle.
  • Select the Frequency.
  • Select Ok.
  • The setup is complete. Now move to the tuning view.



  • In the tuning view select Engine Functions -> Narrow Band Heater 1 Table. This table now controls the Duty Cycle applied to Auxiliary 4 and in turn controls the Lambda Heater


       Important Table Rules in PWM mode:

       

       Table value of 100%         = 100% Duty Cycle

       Table value of 0%        = 0% - Output is OFF

       Table value of 30%        = 30% Duty Cycle