CAGE User's Guide

Setting Up a Tradeoff Calibration

A tradeoff calibration is the process of filling lookup tables by balancing different objectives.

Typically there are many different and conflicting objectives. For example, a calibrator might want to maximize torque while restricting nitrogen oxides (NOx) emissions. It is not possible to achieve maximum torque and minimum NOx together, but it is possible to trade off a slight reduction in torque for a reduction of NOx emissions. Thus, a calibrator chooses the values of the input variables that produce this slight loss in torque instead of the values that produce the maximum value of torque.

A tradeoff also refers to the object that contains the models and tables. Thus, a simple tradeoff can involve balancing the torque output while restricting NOx emissions.

After you set up your variable items and models, you can follow the procedure below to set up your tradeoff calibration:

1. Add a tradeoff. This is described in the next section, Adding a Tradeoff.
2. Add tables to the tradeoff. This is described in Adding Tables to a Tradeoff.
3. Display the models. This is described in Displaying Models in Tradeoff.

This section describes steps 1, 2, and 3 in turn.

When you finish these steps, you are ready to calibrate the normalizers and tables.

Performing a Tradeoff Calibration

Adding a Tradeoff