Overview
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.
Categories
Description
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:
| Mode | % Engine Speed* | % Load | Weight factor** |
|---|---|---|---|
| 1 | 0 | 0 | 35.00 |
| 2 | 11 | 25 | 6.34 |
| 3 | 21 | 63 | 2.91 |
| 4 | 32 | 84 | 3.34 |
| 5 | 100 | 18 | 8.40 |
| 6 | 95 | 40 | 10.45 |
| 7 | 95 | 69 | 10.21 |
| 8 | 89 | 95 | 7.34 |
| * Normalized speed: 0% = low idle, 100% = rated speed ** Relative weight factors, not normalized (they do not add to 100%) |
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The relative weights of particular modes are represented by the area of bubbles in the figure below:
AVL 8-Mode Heavy-Duty Cycle