| 摘要 |
PURPOSE:To limit the differential operation during initial slip period to enhance the anti-slip running ability of a four-wheel drive vehicle, by compensating the difference in rotational speed between front and rear wheels in accordance with learning values of the dynamic radii of both front and rear wheels, and by comparing the difference between the values before and after the compensation is compared with a predetermined value. CONSTITUTION:A control device 100 receives data from a throttle valve opening degree sensor 102, a manual shift position sensor 104, front and rear wheel rotational speed sensors 106, 107, a steering angle sensor 110 and a brake switch 112, and delivers a control signal for a speed change gear 18 to a hydraulic pressure control device 40 and a pulse signal for controlling the torque transmission capacity of a differential operation control clutch 64 to a servo-hydraulic control valve in a hydraulic pressure control device 74. In this arrangement, the dynamic radii of the front and rear wheels are learned in accordance with the difference in rotational speed between the front and rear wheels during normal running with no slippage. Further, the difference in rotational speed is compensated in accordance with the learning value to control the torque transmission capacity of the differential operation control clutch 64 in accordance with the learning value. |
