Patent ID: 8523297

Claim:
A brake control system for an electrically driven vehicle, comprising: a master cylinder for generating a master cylinder pressure in response to an operation of a brake pedal by a driver; a wheel cylinder at a driving wheel for applying a brake force in accordance with a wheel cylinder pressure; a brake fluid actuator having a fluid pressure pump disposed between the master cylinder and the wheel cylinder and driven by a motor; a differential pressure valve for controlling a pressure difference between the wheel cylinder pressure and the master cylinder pressure during operation of the motor; an electric motor connected to the driving wheel for controlling a regenerative braking force; and a brake controller programmed to: obtain a brake target force for the brake force based on the brake pedal stroke position and a target deceleration characteristic; achieve the brake target force by summing a base brake pressure portion derived from the master cylinder pressure and an add-on brake portion derived from at least one of a regenerative brake portion due to the regenerative braking force or a pump-up pressure portion from the brake fluid actuator; and set the add-on portion to a maximum value at an adjusted brake pedal stroke position at a point at which the master cylinder first begins to actually generate the master cylinder pressure.