Abstract: In controlling a vehicle, an ECU (anti-lock brake control device) of a brake control device judges a difference in relative length between lock-to-lock time intervals of left and right wheels (step 302), calculates cumulative compensation amounts in dependence on the judged difference (steps 306, 310 to 316), then calculates pressure increase amounts which are brake fluid pressures to be applied respectively to wheel cylinders for the left and right wheels in a pressure increasing mode, in dependence on the cumulative compensation amounts and a base pressure increase amount, and then controls the brake fluid pressures in the pressure increasing mode so that the brake fluid pressures coincide with those so calculated.

Abstract: An anti-skid control apparatus comprises an anti-skid control means for controlling a pressure reducing valve and a pressure increasing valve, each of which operated for a target wheel when an anti-skid condition is established for the target wheel, the pressure increasing valve controlled in order to linearly change a pressure difference, an estimating means for estimating an occurrence of a factor by which the brake hydraulic pressure is fluctuated at the conduit connecting the master cylinder to the pressure increasing valve for the target wheel while the pressure increasing valve is controlled for the target wheel, and an output means for generating an output for maintaining the pressure difference during a predetermining time period in which the pressure increasing valve is controlled, when the occurrence of the factor is estimated.

Abstract: An apparatus for controlling a pump driving motor includes estimated fluid volume obtaining means for obtaining an estimated volume of a brake fluid discharged to a reservoir, hydraulic pump controlling means for specifying the number of rotations of the motor for driving a hydraulic pump based on the estimated volume and for driving the hydraulic pump with the specified number of rotations, and changing means for changing the number of rotations of the motor to be smaller than the number of rotations specified on the basis of the estimated volume in a case where an actual time defined from a driving start of the hydraulic pump to a point where the brake fluid in the reservoir actually turns to zero is shorter than an estimated time over which the estimated volume turns to zero by a driving of the hydraulic pump with the specified number of rotations of the motor.

Abstract: A brake hydraulic pressure control apparatus for a vehicle includes anti-skid control means for executing an anti-skid control including a pressure reducing control and a pressure increasing control for one of front wheels at which an anti-skid control start condition is established, yaw moment control means for executing a yaw moment control, while the anti-skid control has been executed only for a first front wheel, for a second front wheel, wheel cylinder pressure estimated value calculating means, pressure difference estimated value calculating means, pressure increasing control means, and the pressure difference estimated value calculating means including pressure difference at specific time calculating means for calculating a pressure difference estimated value at specific time on the basis of a pressure difference estimated value at the first front wheel and a wheel cylinder pressure difference between the wheel cylinder pressure estimated values at the second front wheel and the first front wheel.

Abstract: An ABS control apparatus employs a normally-open linear solenoid valve as a pressure-increasing valve, and repeatedly performs ABS control composed of pressure-reducing control and linear pressure-increasing control. This apparatus determines an initial value Pw0 of an estimated wheel cylinder pressure value Pw in consideration of brake operation time before start of ABS control Tstp and vehicle body deceleration at the start of a first-time ABS control, and then determines the estimated wheel cylinder pressure value Pw during the ABS control on the basis of the value Pw0 and the pressure-reducing characteristic of a pressure-reducing valve. This apparatus determines instruction current supplied to the pressure-increasing valve during the linear pressure-increasing control, while using an estimated differential pressure Pdiff (=(Pw0?Pw)+Pup1+Pup2), wherein Pup1 and Pup2 are set in accordance with the time Tstp and additional brake operation during the ABS control, respectively.

Abstract: A second threshold value which is smaller than a first threshold value is set as a threshold value for starting pressure decrease control of a wheel on a high ? road surface side when a select low control is employed. Then, if a slip ratio of the wheel on the high ? road surface side exceeds the second threshold value, a pressure decrease control in ABS control is started even if the slip ratio of a wheel on a low ? road surface side does not exceed the first threshold value. Accordingly, it is possible to prevent the vehicle running state from becoming unstable due to the wheel speed of the wheel on the high ? road surface side from decreasing with respect to the vehicle speed.

Abstract: In controlling a vehicle, an ECU (anti-lock brake control device) of a brake control device judges relative long-short between lock intervals of left and right wheels (step 302), calculates cumulative compensation amounts in dependence on a result of the judgment (steps 306, 310 to 316), then calculates pressure increase amounts which are brake fluid pressures to be applied respectively to wheel cylinders for the left and right wheels in a pressure increasing mode, in dependence on the cumulative compensation amounts and a base pressure increase amount, and then controls the brake fluid pressures in the pressure increasing mode so that the brake fluid pressures coincide with those so calculated.