DEVICE FOR CONTROLLING ANTISKID OF FOUR-WHEEL-DRIVE VEHICLE

摘要

PURPOSE:To enable accurate braking action on a low mu road by providing a clutch whose engaging condition is continuously controllable between front wheel side and rear wheel side driving systems and engaging the clutch at the start of antiskid control and then disengaging same afterward to disperse engine brake torque. CONSTITUTION:The detected values of wheel speed sensors 11FL, 11FR, 11RL, 11RR are inputted into an anti-skid control device 4 and subjected to defined arithmetic processing to control brake pressure fed to the wheel cylinders 10FL, 10FR, 10RL, 10RR of wheels 9FL, 9FR, 9RL, 9RR. At the start of antiskid control, a clutch 55 which can continuously control front/rear differential devices 62, 60 is engaged at a clamping force corresponding to the vehicle speed at the time. The clutch is disengaged afterward together with the operation of brakes. When engine brake torque is high, it is dispersed to four wheels to enable accurate braking action on a low mu road.