Content Comparison

Acceleration Enrichment Tables

• Minimum Pressure TPS Gradient Threshold

  • Intake manifold pressure Throttle position setpoint change gradient for enabling acceleration enrichment (psi*/second)

• Number of Hold Events (720* crk rotation)

  • Once acceleration enrichment is enabled, how long do we hold the maximum calculated enrichment value for before decaying.

• Enrichment Decay Rate

  • Once the above hold events have passed, the enrichment value is reduced by this value every 720* of engine rotation until it is 0 (at which point acceleration enrichment is disabled)

• Base Enrichment

  • This is the main acceleration enrichment table with axis’s of Intake manifold pressure Throttle position setpoint change gradient x Engine RPM.

• Base Enrichment Correction (Temp)

  • This table is multiplied by the Base Enrichment table to provide compensation for different engine coolant temperatures. A value of 100% is effectively a 1.0 multiplier and therefore doesn’t change the base enrichment. A value of 200% is effectively a 2.0 multiplier so final enrichment would be base enrichment * 2.0 in this example.

• Base Enrichment Correction (Manifold Pressure)

  • This table is multiplied by the Base Enrichment table to provide compensation for different intake manifold pressures when acceleration enrichment is requested. A value of 100% is effectively a 1.0 multiplier and therefore doesn’t change the base enrichment. A value of 200% is effectively a 2.0 multiplier so final enrichment would be base enrichment * 2.0 in this example.

• Cooldown Segments (720* crk rotation) Before Next Enrichment Allowed

  • This table allows acceleration enrichment to be blocked for a specific number of engine cycles (720*) after it has been enabled. This is used to prevent acceleration enrichment from enabling multiple times during the same acceleration event. We recommend using 4 as an initial value.

• Hold Time for Disabled STFT due to AE

  • This table defines how long the short-term fuel trim is disabled during an acceleration enrichment event.

• Acceleration Enrichment Threshold to disable STFT

  • This table defines how much acceleration enrichment must occur to disable the short-term fuel trim.

• OEM Acceleration Enrichment Ceiling

  • This table caps how much acceleration enrichment is contributed by the OEM (slow component) acceleration enrichment system.