longtermoctane
Differences
This shows you the differences between two versions of the page.
| Next revision | Previous revision | ||
|
longtermoctane [2008/01/23 11:02] 76.100.119.159 created |
longtermoctane [2024/03/15 11:16] (current) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Details ====== | + | ====== The Whats and Hows of LongTermOctane ====== |
| Effectively, the DSM ECU uses two tables to calculate a "basic" ignition advance value. One table is used when the ECU believes fuel octane is at its highest value. The other table is used when the ECU believes fuel octane is at its lowest value. The ECU interpolates between these two extremes by adjusting its idea of fuel octane. This adjustment is done by monitoring knock retard (the amount of ignition delay added in by the ECU in response to knock sensor activity). More detonation means more knock retard and a lower "value" for the ECU's fuel octane rating. | Effectively, the DSM ECU uses two tables to calculate a "basic" ignition advance value. One table is used when the ECU believes fuel octane is at its highest value. The other table is used when the ECU believes fuel octane is at its lowest value. The ECU interpolates between these two extremes by adjusting its idea of fuel octane. This adjustment is done by monitoring knock retard (the amount of ignition delay added in by the ECU in response to knock sensor activity). More detonation means more knock retard and a lower "value" for the ECU's fuel octane rating. | ||
| Line 20: | Line 20: | ||
| The update is further gated by a timer that requires a certain amount of time to pass between updates. That time varies from 1G to 2G. For a 1G, it's a flat 0.4 seconds between updates. For a 2G, the ECU requires 1.2 seconds to pass after an increase in octane rating and 0.6 seconds after a decrease. | The update is further gated by a timer that requires a certain amount of time to pass between updates. That time varies from 1G to 2G. For a 1G, it's a flat 0.4 seconds between updates. For a 2G, the ECU requires 1.2 seconds to pass after an increase in octane rating and 0.6 seconds after a decrease. | ||
| + | |||
longtermoctane.1201104128.txt.gz ยท Last modified: 2008/01/23 11:02 by 76.100.119.159
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
