Air Mass Model Compensation

Overview

The Air Mass Model Compensation applies a percentage adjustment to the calculated Final Air Mass. The resulting Air Mass Final value can be viewed in F3 Runtime → Air Mass. The Air Mass Model Comp (%) value applied to the calculation is also displayed here.

The Air Mass Model Compensation function is enabled from Config → Air Mass → Air Mass Model Setup.

In the example below, Speed Density calculates an Air Mass of 0.558 g/cyl. A 2.20% compensation is then applied, resulting in a Air Mass Final of 0.570 g/cyl.

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This 3D table can be used to compensate for engine operating conditions that are not fully represented by the selected Air Mass Model, improving air mass accuracy across the operating range.

The compensation is applied AFTER the primary air mass calculation has been completed.

  • 0.0% = No compensation applied
  • Positive values = Increase calculated air mass
  • Negative values = Decrease calculated air mass
Note:

  • The Air Mass Compensation Table should not be used to compensate for incorrect VE calibration or sensor scaling errors. These should be corrected at their source wherever possible.

  • The X and Y axes of the Air Mass Comp Table are fully configurable and may be assigned to any suitable ECU runtime. This allows the compensation to be tailored to the specific engine and application.

  • Units: Air Mass Flow is expressed in units of g/s (grams per second), while Air Mass is expressed in units of g/cyl (grams per cylinder), representing the mass of air trapped in the cylinder during a single engine cycle