CONTROL DEVICE FOR CENTER DIFFERENTIAL GEAR

Japanese Patent JPS63240432

A

PURPOSE:To ensure a traveling property by judging a rotating speed detecting means abnormal from the difference in rotating speed between front and rear wheels at the time of the differential limitation of a center differential gear and removing the differential limitation at the time of abnormality in a vehicle in which said center differential gear is assembled to a propeller shaft for transmitting power to said front and rear wheels. CONSTITUTION:In a four wheel drive vehicle having a center differential gear 22 in which a differential limiting mechanism 34 is assembled in the joint part between propeller shafts 20, 21 for transmitting power to front and rear wheels, rotating speed detecting means 24, 26, and 28, 30 for detecting the rotating speeds of front and rear wheels respectively are provided. And, in a controller 32 into which the detected outputs are inputted, the sum of the front wheel rotating speed F and rear wheel rotating speed R is operated and compared with a reference value and, when the sum of the rotating speeds is below the reference value while differential limitation being under way, the magnitudes of both rotating speeds F, R are compared. Here, when F>R (F