A modular traction control transfer case was designed and developed using two variable reluctance electronically controlled inboard electric motors to shift high/low range and operate traction control.
The modular construction helps to minimize the weight of the transfer case assembly, providing for the adaptation of reduction or over-drive ratios with minimal modification. The module design also provide easy adaptation to numerous transmission and because of its unique design the transfer case lends itself to low clearance floor pans.
The compact size of the transfer case is a prime example of the “power density” concept; it is light weight and compact. Even with two electric motors internal to the design, space is utillized to the fullest.
The transfer case offers a full array of functions consisting of: high gear 2 wheel drive with the front axle disconnected; part time 4 wheel drive with the front and rear axle rigidly connected; synchronized 2 wheel to 4 wheel drive with shifting on the fly at any speed; All wheel drive with variable torque traction control; part time 4 wheel drive in low gear; and with simple changes to the controlling algorithm over-drive ratio can replace reduction ratio or other combinatons such as low gear 2 wheel drive and low gear all wheel drive can be added.
The electronic control package is designed to control the variable reluctance motors, the interface between the vehicle operator and the transfer case, motor feed back circuits and the traction control algorithm, the motors are designed with built in feedback circuits to maintain control of rotor position at all times. The electronic package can be installed inside the passenger compartment with push button controls for the operator interface.