Vehicle brake system

摘要

A vehicle brake system for braking a vehicle including a braking-mode switching mechanism configured to selectively effectuate, depending upon situations of the vehicle brake system, one of (A) a regulated-pressure-dependent braking mode in which is generated a regulated-pressure-dependent braking force having a magnitude that depends on a regulated pressure of a working fluid and (B) a braking mode depending on an operation force and the regulated pressure in which are generated both of an operation-force-dependent braking force having a magnitude that depends on the operation force by a driver and the regulated-pressure-dependent braking force.

主权项

1. A vehicle brake system for braking a vehicle, comprising a hydraulic brake system configured to generate a braking force in dependence on a pressure of a working fluid, a regenerative brake system configured to generate a braking force while regenerating running energy of the vehicle into electric energy, and a brake controller configured to control the vehicle brake system,
wherein the hydraulic brake system includes:
a brake device provided for a wheel of the vehicle and configured to generate a braking force having a magnitude that depends on the pressure of the working fluid supplied thereto;a master cylinder device configured to pressurize the working fluid and to supply the pressurized working fluid to the brake device;a brake operation member which is connected to the master cylinder device and on which a brake operation by a driver is performed;a high-pressure-source device configured to highly pressurize a working fluid;a pressure regulator device configured to regulate the working fluid highly pressurized by the high-pressure-source device and to supply the working fluid whose pressure is regulated; anda braking-mode switching mechanism configured to selectively effectuate, as a braking mode of the hydraulic brake system, one of (A) a regulated-pressure-dependent braking mode in which the hydraulic brake system generates a regulated-pressure-dependent braking force having a magnitude that depends on a regulated pressure that is a pressure of the working fluid supplied from the pressure regulator device, without substantially depending on an operation force applied by the driver to the brake operation member and (B) a braking mode depending on the operation force and the regulated pressure in which the hydraulic brake system generates both of an operation-force-dependent braking force having a magnitude that depends on the operation force and the regulated-pressure-dependent braking force, and wherein the vehicle brake system is configured (a) to brake the vehicle by the operation-force-dependent braking force and the regulated-pressure-dependent braking force, such that the braking-mode switching mechanism effectuates the braking mode depending on the operation force and the regulated pressure and such that the regenerative brake system does not generate a regenerative braking force that is the braking force generated by the regenerative brake system, at least after the brake device becomes capable of generating the braking force in a period from a time point of initiation of the brake operation to a time point when an operation amount of the brake operation member becomes constant and (b) to brake the vehicle by the regulated-pressure-dependent braking force and the regenerative braking force such that the braking-mode switching mechanism effectuates the regulated-pressure-dependent braking mode and such that the regenerative brake system generates the regenerative braking force, when the operation amount becomes constant.