Wheel slippage detection for drivetrain control

A method for controlling transmission gears in a vehicle, said method comprising:

• reading a speed signal from a speed sensor at an output of the transmission at predetermined sample times;
• converting the speed signals to acceleration signals and storing the acceleration signals;
• calculating an acceleration average over a predetermined number of speed sensor readings;
• determining whether a current acceleration signal exceeds the acceleration average by a first predetermined value;
• preventing the transmission from changing gears if the current acceleration signal does exceed the acceleration average by the first predetermined value;
• determining whether the acceleration signal has fallen below a second predetermined value;
• and
• stopping preventing the transmission from changing gears if the acceleration signal has fallen below the second predetermined value.

A system for controlling a torque converter slip in a vehicle that includes an engine, a transmission and a torque converter therebetween, said system comprising:

• means for reading a speed sensor signal from a speed sensor on the vehicle at predetermined sample times;
• means for converting the speed signals to acceleration signals and means for storing the acceleration signals;
• means for calculation an acceleration average over a predetermined number of speed sensor readings;
• means for determining whether a current acceleration signal exceeds the acceleration average by a first predetermined value;
• means for holding the torque converter slip to a current value if the current acceleration signal does exceed the acceleration average by the first predetermined value;
• means for determining whether the acceleration signal has fallen below a second predetermined value;
• and
• means for stopping holding the torque converter slip if the acceleration signal has fallen below the second predetermined value.