Precision Turbo and Engine BigStuff3 GEN3 Engine Torque Management (ETM) System - Manual (Page 6)

A user defined driveshaft speed is inputted into the GEN3’s “Desired Driveshaft Table”. The eight
second (8) time period is broken up into 80 cells each representing 1/10 of a second. In each of the
eighty (80) cells, the user can define the desired drive shaft speed. The desired driveshaft curve should
be 100- 200 RPM above the “best” driveshaft curve possible. All the usual editing features are
employed (Fill, Interpolate, etc…) in the table as well, but only a row at a time. Remember to hit the
“Enter” key to guarantee the change takes place if changing the cells independently.
User defined, desired
driveshaft speed is
inputted for each time
period, eighty (80)
periods in total.
Time
scale
starting
a zero
seconds
Time scale,
ending at 7.9
seconds.
Once the desired driveshaft speed is defined, the GEN3 ETM system uses a patent pending 32 level
torque management control strategy to ensure the actual driveshaft speed follows the desired driveshaft
curve. A Torque Reduction Stage of thirty one (31) means that all the cylinders are firing. A Torque
Reduction Stage of zero (0) means none of the cylinders are firing.
The difference between the “actual” and “desired” drive shaft speed is called “Driveshaft Error”. A
“Drive Shaft Error” table is also used to define the level of control applied as a function of driveshaft
error. The GEN3 ECU has an eight (8) cell “Driveshaft Error” table for the user to define the torque
reduction stage needed for different degrees of drive shaft error. For example, if the GEN3 ECU
determines (from sensors used in the system) that the driveshaft error is 800 rpm, the ECU will apply a
very aggressive torque reduction stage, lets say a level nine (9). The driveshaft RPM error range in the
table goes from zero (0) RPM error to 896 RPM error. Each cell covers 128 RPM of driveshaft error.
A linear interpolation is used between rpm cells. The GEN3 data acquisition “Replay” system will
provide a graph of the amount of torque management using the variable called TorqRdStg.
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