VEHICULAR BRAKING DEVICE

摘要

A vehicular braking device can shorten the time between pilot pressure input to a regulator and generation of servo pressure, and reduce product-by-product time variations for servo pressure generation. This vehicular braking device comprises: a servo pressure rising start time measurement unit that measures, in advance, a servo pressure rising start time which is the time from pilot pressure input to a first pilot chamber by opening a pressure increase valve to when a servo pressure starts to rise, and stores the servo pressure rising start time in a storage unit; a pilot pressure increase time calculation unit that calculates a pilot pressure increase time based on the servo pressure rising start time stored in advance in the storage unit; and a pre-fill control unit that increases the pilot pressure for the pilot pressure increase time by opening the pressure increase valve when brake pedal operation is detected.

主权项

1. A vehicular braking device comprising:
a master cylinder connected to a wheel cylinder of a friction brake device for applying a braking force to a wheel of a vehicle, the master cylinder supplying a brake fluid to the wheel cylinder; an output piston slidably disposed in the master cylinder, the output piston being driven by a servo pressure that is a fluid pressure in a servo chamber delimited by the master cylinder to change the volume of a master chamber filled with the brake fluid supplied to the wheel cylinder; a regulator that allows the servo pressure corresponding to a pilot pressure that is a fluid pressure in a partitioned pilot chamber to generate in the servo chamber, on the basis of the fluid pressure of the brake fluid accumulated in the accumulator; an electromagnetic valve that adjusts a flow of the brake fluid from the accumulator to the pilot chamber; a braking force generation determination unit that determines the probability of level of generation of the braking force in the friction brake device; a storage unit that stores a servo pressure rising start time that is a time from when the pilot pressure is a value equivalent to an atmospheric pressure to when the servo pressure starts to rise by inputting the brake fluid from the accumulator into the pilot chamber by means of the electromagnetic valve, or a setting time set based on the servo pressure rising start time; and a pre-fill control unit that performs pre-fill control to open the electromagnetic valve and input the brake fluid from the accumulator into the pilot chamber for the servo pressure rising start time or the setting time stored in the storage unit, when the braking force generation determination unit determines that the probability of generation of the braking force in the friction brake device is high.