CAGE User's Guide    

Calibrating the Normalizers

Normalizers are the axes for the lookup tables. Currently, Norm_N has 12 breakpoints; the other normalizers have 10 breakpoints each. This section describes how to set values for the normalizers Norm_N and Norm_L, based on the torque model, tq.

To display the Normalizer view, select the normalizer Norm_N in the branch display.

The Normalizer view has two panes: Norm_N and Norm_L.

In each pane, you see

In both Normalizer panes, the Input Output table and the Normalizer Display show the position of the breakpoints.

The Breakpoint Spacing display shows a blue slice through the model with the break points overlaid as red lines.

For a more detailed description of the Normalizer view, see Normalizer View.

Placing the Breakpoints Automatically

You now must space the breakpoints across the range of each variable. For example, Norm_N takes values from 500 to 6500, the range of the engine speed.

To space the breakpoints evenly throughout the data values:

  1. Click  in the toolbar. Alternatively, select Normalizer -> Initialize.
  1. This opens a dialog box that suggests ranges for Norm_N and Norm_L.

  1. To accept the default ranges of values of the data, click OK.

A better fit between model and table can often be achieved by spacing the breakpoints nonlinearly.

  1. Click  in the toolbar. Alternatively, select Normalizer -> Fill.
  1. This opens a dialog box that suggests ranges for Norm_N and Norm_L. It also suggests values for AFR and SPK; these values are the set points for AFR and SPK.

  1. To accept the values in the dialog box, click OK.
  1. This ensures that the majority of the breakpoints are where the model is most curved. The table now has most values where the model changes most. So, with the same number of breakpoints, the table is a better match to the model.

    For more information about calibrating the normalizers, see Normalizers.

You can now calibrate the lookup tables; this is described in the next section.


  Calibrating a Feature Calibrating the Tables