CAGE User's Guide

Calibrating the Tables

After you set up your session and your tables, you can calibrate your tables.

Highlight a table in the branch display to view the Table view. For more information about the Table view, see Table View.

In CAGE, a table is defined to be either a one-dimensional or a two-dimensional lookup table. One-dimensional tables are sometimes known as characteristic lines or functions. Two-dimensional tables are also known as characteristic maps or tables.

Each lookup table has either one or two axes associated with it. These axes are normalizers. See Normalizers for more information.

For example, a simple MBT feature has two tables:

• A two-dimensional table with speed and relative air charge as its normalizer inputs
• A one-dimensional table with AFR as its normalizer input

Before you can calibrate your tables, you must calibrate your normalizers. For information, see Calibrating the Normalizers.

This section describes how you can use CAGE to fill your lookup tables by reference to a model.

To fill the table values, either click the buttons in the toolbar or select from the following options in the Table menu:

• Initialize

• Sets each cell in the lookup table to a specified value. For information, see Initializing Table Values.

• Fill

• Fills the table values by reference to the model. For information, see Filling Table Values.

• Optimize

• Fills the table values by minimizing the total square error between the table values and the model. For information, see Optimizing Table Values.

• Extrapolate

• Fills the table values based on the cells specified in the extrapolation mask. You can choose values in cells that you trust to define the extrapolation mask and fill the rest of the table using only those cells for extrapolation. For information, see Filling the Table by Extrapolation.

• Fill by Inversion

• Fills the table by creating an inversion of another table. For information, see Inverting a Table.

The next sections describe each of these in detail.

Setting Up Your Strategy

Initializing Table Values