| 摘要 |
PURPOSE:To attempt improvement of control property of acceleration slip. at the beginning of acceleration slip control, by maintaining an electromagnetic value boosting and reducing brake hydraulic pressure to driving wheels in the boosted state continuously for the time longer than one cycle of a pulse state exciting current. CONSTITUTION:When a controlling device 60 detects stepping in of an accelerator pedal 18 by a sensor 20 and judges acceleration state, it reads signals from front wheel speed sensors 66 and 68 and a driving wheel speed sensor 70. And when they exceed a certain slip rate, it drives hydraulic pressure brakes 38 and 40 of driving wheels by the pressure boosting/reducing speed according to the pressure boosting/reducing by an electromagnetic directional control valve 56 and the duty ratio of a solenoid exciting current of an electromagnetic flow amount control valve 58 and executes acceleration slip control. At the beginning of this acceleration slip control, the controlling device 60 maintains the electromagnetic valve 58 in the boosted state continuously for the time longer than one cycle of a pulse state exciting current, ad after the end of the initial control, the electromagnetic valve 58 is controlled by the duty ratio. In this way, control property of acceleration slip can be improved.
|
