Electric vehicle brake control device

A vehicle brake control device for an electrically driven vehicle, comprising:

• a master cylinder that generates a master cylinder pressure in accordance with a braking operation;
• a wheel cylinder is disposed at each front and rear wheels to supply a hydraulic pressure braking power to a corresponding one of the front and rear wheels;
• a brake hydraulic pressure actuator interposed between the master cylinder and the wheel cylinders, and the brake hydraulic pressure actuator including a hydraulic pressure pump driven by a pumping motor and a differential valve for controlling the pressure difference between a wheel cylinder pressure and the master cylinder pressure during operation of the pumping motor;
• a regenerative brake force control unit is connected to an electric drive motor that is coupled to a drive wheel, the regenerative brake force control unit controlling a regenerative brake force that is generated by the electric drive motor;
• a regenerative cooperative brake control unit that achieves a target deceleration at the braking operation by a sum of a base hydraulic pressure portion of the master cylinder pressure and a regenerative portion of the regenerative brake force, and further compensates for a shortage of the regenerative portion by an add-on pressure portion generated by the brake hydraulic pressure actuator;
• a motor stop control unit that stops the pumping motor from operating upon the vehicle speed falling below a first predetermined vehicle speed value;
• and
• a motor restart control unit that sets the target deceleration value lower than the target deceleration of a driver's request and restarts the pumping motor upon determining the vehicle speed exceeding a second predetermined vehicle speed value and brake is operated while the pumping motor is in a stopped state.