Four-wheel drive transfer case controller

摘要

In a vehicle which includes a front driveshaft for transferring motive power to a front set of wheels and a rear driveshaft for transferring motive power to a rear set of wheels and a clutch to control the amount of torque provided to the driveshafts, a method is provided to control the amount of power delivered to the front and rear driveshafts. The duty cycle of the clutch is monitored and it is determined whether the clutch duty cycle passes a first lower threshold and a second higher threshold, successively, a predetermined number of times within a calibratible time period. A 4 Hi Lock mode is entered if the clutch duty cycle passes the first lower threshold and the second higher threshold, successively, a predetermined number of times within the calibratible period.