| 摘要 |
The invention is directed to an arrangement for controlling a braking force applied to each of the road wheels of a part time four-wheel drive vehicle depending upon a braking condition, with a hydraulic braking pressure supplied to each of wheel brake cylinders through pressure control valves respectively. The pressure control valves are controlled by the braking force controller into which output signals of wheel speed sensors are fed. A deceleration of the vehicle is detected by a deceleration sensor. In a counter, counted is the number of repetitions of decrease of the wheel speed of each road wheel down to below a predetermined standard speed and recovery of the wheel speed up to and over the standard speed. The value counted in each road wheel during a predetermined period of time in the counter is compared with a predetermined value in a comparator. When it is determined that the value counted for each road wheel is equal to or greater than the predetermined value respectively and the deceleration detected by the deceleration sensor does not reach to a predetermined deceleration, a drive mode determination unit determines that the vehicle is in the four-wheel drive mode. In accordance with the result of the drive mode determination unit, the braking force control to be executed is selected in the controller.
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