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All Wheel Drive and a Concept of "Central" Drive Distribution
Published January 01, 1989 by Institution of Mechanical Engineers in United Kingdom
Event: Second International Conference on New Developments in Powertrain and Chassis Engineering, Conf.
Analysis of the power distribution in existing all wheel drive (AWD) transmission shows limits regarding their function and effectiveness. All existing AWD designs are based on the concept of two wheel drive, including differential drives between two wheels on the same axle. Studies of kinematics and dynamics of such AWD transmission demonstrate that incorporation of differential drives causes a basic limit regarding their function and effectiveness. That was the reason why we developed a new concept of transmission, here named as "central power distribution" for all wheel drive (CAWD). That new transmission doesn't include any differential drives. Better function and effect of CAWD are approached using existing transmission mechanisms, as are friction and visco-clutches and even CVT units. Control logic and elements for CAWD may be the same as for existing ASR and ABS systems