Patent attributes
This brake hydraulic pressure control apparatus adopts, as the pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust the actual differential pressure. This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, after ABS control start conditions are satisfied (after time t1). In this case, a pulse pressure-increasing control is executed instead of the linear pressure-increasing control only in the first-time control cycle (time t3 to t6). Then, the current value IC corresponding to the actual differential pressure at the point of starting the linear pressure-increasing control (time t8) in the second-time control cycle is estimated from the repeated number of times of the pulse pressure-increasing control by utilizing the fact that the repeated number of times becomes a value representing the current value IC corresponding to the actual differential pressure at the same point.
