EDIT:
Demo
https://www.youtube.com/watch?v=NN0nMI9tMI0
Found Ecutek's documentation on 370Z traction control. Looks like they have a traction control table that retards ignition timing for given wheel slip percent and engine RPM, as well as a table that multiples throttle (meant to be 0-1.0 multiplier) as well.
I'd love to be able to play around with this more myself because I think setting intervention at lower wheel slip angles would help a lot. A problem I'm seeing based of the example tables is there is not much resolution for single digit slip percentages. Without knowing what the table setup is, currently, I'd have a tough time tuning. Plus relying on Eugene or another tuner to make adjustments is a big barrier to testing and refining.
Quote:
Using Custom Maps it’s possible to create Traction Control maps that will reduce engine torque for a given wheel slip ratio%
You can find a Traction Control Example ROM in your 370z folder, see Section 5.7 for its location.
To create Traction Control we only need two Custom Maps, in the Example ROM we used maps D and E
Custom Map D – Ignition Timing Retard
X axis is Wheel Slip Ratio%
Y axis is Engine Speed
The Map Output will be added to the current ignition timing for a given Engine Speed and Wheel Slip Ratio
As the differential speed between front and rear wheel speed increase then more ignition retard is applied and the engine torque will be reduced, as the RPM increases the retard amount is increased further reducing engine torque avoiding the fuel cut rev limiter
Custom Map E – Throttle Multiplier
X axis is Wheel Slip Ratio%
Y axis is Engine Speed
The Map Output will multiply the current Throttle Target for a given Engine Speed and Wheel Slip Ratio
As the differential speed between front and rear wheel speed increases the throttle target will be reduced by the map output multiplier. Due to two large diameter throttle butterflies being fitted we need to significantly reduce the throttle opening amount at low RPM (low airspeed) for the closing throttle to actually achieve any worthwhile reduction in airflow and therefore engine torque
The Traction Control can be further enhanced with the addition weighting factors like vehicle speed, steering angle, G force lateral and rotational and we can even set up a dash mounted potentiometer and import the 0v - 5v signal to be used as an overall gain from the aggression of the feature
|