VEHICULAR BRAKE HYDRAULIC PRESSURE CONTROL APPARATUS

摘要

Pitching is reduced even when strong braking operation is performed during low speed running. A vehicular brake hydraulic pressure control apparatus includes control section that performs pitching reducing control for reducing occurrence of pitching by controlling each control valve unit to switch brake hydraulic pressure between pressure increasing state, pressure decreasing state, and holding state. The control section performs pitching reducing control based on weight distribution ratio between front wheels and rear wheels during deceleration, and includes distribution ratio calculating section for calculating the weight distribution ratio from deceleration of vehicle, vehicle speed calculating section for calculating vehicle speed, and determining section for determining whether or not to perform pitching reducing control, wherein the determining section determines to perform pitching reducing control if conditions are satisfied, the conditions including at least that the calculated vehicle speed is lower than a predetermined speed and that braking operation is being operated.

主权项

1. A vehicular brake hydraulic pressure control apparatus, comprising:
control valve units for switching between communication and shut-off of a fluid path communicated from a hydraulic pressure source to a wheel brake and switching between communication and shut-off of a fluid path communicated from the wheel brake to a reservoir; and a control section for performing pitching reducing control to reduce occurrence of pitching on a vehicle caused by swinging of a weight, by controlling the control valve units to switch respective brake hydraulic pressures that act on the respective wheel brakes under a pressure decreasing state, a holding state, and a pressure increasing state, wherein the control section performs the pitching reducing control, based on a weight distribution ratio between front wheels and rear wheels during deceleration, and comprises: a distribution ratio calculating section for calculating the weight distribution ratio from deceleration of the vehicle; a vehicle speed calculating section for calculating a vehicle speed; and a determining section for determining whether or not to perform the pitching reducing control, and wherein the determining section determines to perform the pitching reducing control in case that conditions are satisfied, the conditions including at least that: the calculated vehicle speed is lower than a predetermined speed at which pitching tends to occur; and braking operation is being performed.