| 摘要 |
PURPOSE:To prevent tight corner braking phenomena thus to stabilize the car position when turning by controlling the driving force distribution of front and rear wheels with correspondence to the degree of tight corner braking phenomena caused through differential rotary speed between front and rear wheels. CONSTITUTION:Function of clutch piston 23 of multi-board frictional clutch in transfer unit is controlled through a hydraulic actuator 33 including a hydraulic pump 36 while the pressure control valve 39 of hydraulic actuator 33 is controlled through a controller 34. The controller 34 is comprised of an operating circuit 46 for operating the differential rotary speed DELTAN on the basis of the output signals from a car speed sensor 48 and a steering angle sensor 49 and a control signal generating circuit 47 for producing a control signal through duty ratio control with correspondence to the differential speed DELTAN. The larger the differential speed DELTAN is, the longer the power supply time to the pressure control valve 39 is, to lower the pressure of control oil thus to bring into a state near to 2WD and to prevent the tight corner braking phenomena.
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