A method is directed to controlling a differential within an active antilock
brake
system. The method provides for receiving a secondary axle wheel speed, receiving
a vehicle speed, determining a difference value between the vehicle speed and the
secondary axle wheel speed, and activating the differential responsive to the difference
value. The step of activating the differential responsive to the difference value
may include steps for comparing the difference value to a threshold value and activating
the differential based on the comparison. The step of activating the differential
based on the comparison may include steps for determining a differential request
value based on the comparison, activating the differential responsive to the differential
request value when the differential request value is less than a maximum differential
request value, and activating the differential responsive to the maximum differential
request value when the differential request value exceeds the maximum differential
request value.
