Performing a Tradeoff Calibration

A tradeoff calibration is the process of calibrating lookup tables by adjusting the control variables to result in table values that achieve some desired aim.

For example, you might want to set the spark angle and the air/fuel ratio (AFR) to achieve the following objectives:

• Maximize torque

• Restrict CO emissions

The data in the tradeoff is presented in such a way as to aid the calibrator in making the correct choices. For example, sometimes the model is such that only a slight reduction in torque results in a dramatic reduction in CO emissions.

The basic procedure for performing tradeoff calibrations is as follows:

1. Set up the variables and constants. (See Setting Up Variable Items.)

2. Set up the model or models. (See Setting Up Models.)

3. Set up the tradeoff calibration. (See Setting Up a Tradeoff Calibration.)

4. Calibrate the tables. (See Calibrating Tables in a Tradeoff Calibration.)

5. Export the normalizers, tables, and tradeoffs. (See Exporting Calibrations.)

You can also use regions to enhance your calibration. (See Using Regions.)

See also

• Tutorial: Tradeoff Calibration in the Getting Started documentation.

  This is a tutorial giving an example of how to set up and complete a simple tradeoff calibration.

• Automated Tradeoff is a guide to using the optimization functionality in CAGE for tradeoffs.

The normalizers, tables, and tradeoff form a hierarchy of nodes, each with its own view and toolbar.

Tradeoff Calibrations

Setting Up a Tradeoff Calibration

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