Patent ID: 6449549
Filing Date: 2002-09-10
Classification: B60K

Abstract:
A method for controlling a torque transfer unit having a driven input shaft coupled to divide torque between first and second output shafts, the transfer unit including a selectively engageable clutch means responsive to an engagement signal for interconnecting said first and second shafts to prevent slip therebetween, said method comprising the steps of:(a) generating first and second stack registers each comprising a plurality of registers stacked in sequential order; (b) generating a first pulsed signal count wherein each pulse of said first pulsed signal count represents a predetermined amount of rotation of the first output shaft; (c) adding said first pulsed signal count to said first stack register; (d) eliminating a first count from said second stack register; (e) generating a second pulsed signal count wherein each pulse of said second pulsed signal count represents a predetermined amount of rotation of the second output shaft; (f) adding said second pulsed signal count to said second stack register; (g) eliminating a second count from said first stack register; (h) calculating a first sum total and a second sum total of said pulsed signal counts in said first and second stack registers, respectively; (i) comparing the first and second sum total of the pulsed signal counts of each stack to thereby determine the relative rotational difference between said first and second output shafts; and (j) generating a clutch engagement signal if a count difference obtained in step (i) is equal to or greater than a predetermined value.