Ignition Timing - Primary, Decel, and Startup
For more information on the basics of Ignition Timing and Detonation, see: Ignition Timing and Knock Control.
Targets
Acceleration (or "Primary")
This target is active when the accelerator pedal is depressed, or otherwise when conditions are met for the Ignition - Accel. Dynamics - Decel Active (⚑, ubyte) parameter to be zero.
This ignition timing target and its associated tables and parameters are sorted under the Ignition - Primary folder and are comprised of four key base tables:
- Ignition - Primary - TGVs Closed (AVCS Disabled)
- Ignition - Primary - TGVs Closed (AVCS Enabled)
- Ignition - Primary - TGVs Open (AVCS Disabled)
- Ignition - Primary - TGVs Open (AVCS Enabled)
These four tables are first blended based on the corresponding blending values of Engine - AVCS Map Ratio (﹪, ubyte) and the Engine - TGV Map Ratio (﹪, ubyte). The resulting base value can be monitored using the Ignition - Primary - Base Table (°, sbyte) parameter.
Then, a Dynamic Advance value is calculated using the Knock Control - Dynamic Advance Multiplier (ubyte), commonly referred to as "DAM". This DAM value ranges from 0.00 to 1.00 and acts as a multiplier to the base dynamic advance table value. This base dynamic advance value is found by using the two primary base tables that are themselves blended using the TGV Map Ratio:
- Ignition - Primary - Advance - TGVs Closed (Base)
- Ignition - Primary - Advance - TGVs Open (Base)
The resulting blended, base value can be monitored using the Ignition - Primary - Advance - Table (°, ubyte) parameter. This value is summed with the Ignition - Primary - Base Table (°, sbyte) to produce a primary base target value.
Deceleration (or "Decel")
Startup
Control Systems
Accelerator Dynamics
Accelerator Dynamics is the control system that blends the Primary Ignition and Decel Ignition targets.
