US: Heavy-duty: AVL 8-Mode

The AVL 8-Mode test is a steady-state engine test procedure, designed to closely correlate with the exhaust emission results over the US FTP heavy-duty engine transient cycle, particularly in respect to NOx emissions. The test has been used primarily as a research tool.

The test includes 8 steady-state modes. The composite value is calculated by applying weighing factors on the modal results.

The sequential engine operating points are as follows:

The relative weights of particular modes are represented by the area of bubbles in the figure below.

AVL 8-Mode Heavy-Duty Cycle