Hi all,
I have a Sprintex supercharged 2013 Jeep Wrangler with the NAG1 trans in which I'm wanting to tune the part throttle shifting on.
From the PT tables the shifts are scheduled by the Accelerator Pedal Position vs Output Shaft Speed.
In these tables what is the actual PID used for the Accelerator Pedal Position?
I have data logged the following to try and determine the shifting behavior:
Throttle & Accel PID's:
Accelerator Pedal Position Sensor (V)
Accelerator Position D (%)
Commanded Throttle Actuator (%)
Throttle Position (%)
Trans Pedal Position (%)
Trans PID's
WOT Shift (Flag)
Upshift (Flag)
Downshift (Flag)
Trans Current Gear
Trans Shift Mode
Aggression Blend(%)
Upshift Speed Offset (RPM)
Downshift Speed Offset (RPM)
Trans Turbine RPM (RPM)
Trans Output Shaft RPM (RPM)
Upon reviewing data logs with very light throttle applications (quasi-steady state to eliminate any other transients) I cannot seem to link the commanded upshift/downshift (flag) and corresponding output shaft speed to any throttle PID. All of them seem to be way out re: 50+ RPMs . The aggression blend is 0.0% so one would assume that the normal scheduling table would be used. On the other hand, the WOT shift table is predictable and commands the shifts once the output shaft speed is reached.
To add to the confusion, none of the 4 throttle % PIDs I've logged are the same value. Furthermore, the only PID that reaches 100% on WOT is the trans pedal position. I have confirmed that this PID triggers the WOT shift flag, however it comes no where near the values when a shift is commanded.
What I think I know:
The Accelerator Position D (%) is derived from the Accelerator Pedal Position Sensor (V) and maxes out at around 91%.
The Commanded Throttle Actuator (%) follows the Throttle Position (%) but has a -10% offset... They max out at ~76% and 86% respectively (Which one is the actual throttle blade position??).
The Trans Pedal Position (%) seems to follow the Accelerator Position D (%) however it is scaled from 0 - 100%. Least corresponding PID to the shift scheduling tables.
Any help would be greatly appreciated.
Kind regards,
Dan
Tune and corresponding datalog attached.