Vehicle control device

A vehicle control device applicable to a vehicle brake device which includes;

• a master cylinder wherein a master piston is driven to move by a servo pressure in a servo chamber and by the movement of the master piston, a master pressure in a master chamber is changed;
• a servo pressure generating device formed by a high pressure source, a pressure increasing control valve disposed between the high pressure source and the servo chamber for controlling a flow of a brake fluid from the high pressure source to the servo chamber and a pressure decreasing control valve disposed between a low pressure source and the servo chamber for controlling the flow of the brake fluid from the servo chamber to the low pressure source for generating the servo pressure in the servo chamber in response to an operation of a brake operating member by a driver of a vehicle;
• a servo pressure sensor configure to detect the servo pressure;
• a wheel cylinder configure to apply a braking force to a vehicle wheel in response to the master pressure from the master cylinder;
• and
• a brake actuator disposed between the master cylinder and the wheel cylinder and structured at least so that the brake fluid supplied to the wheel cylinder is pumped back to the master cylinder by a built-in pump, the brake actuator being used for a braking control for controlling a braking force generated by the wheel cylinder, wherein,
• the vehicle control device is configured to control the pressure increasing control valve and the pressure decreasing control valve so that an actual servo pressure detected by the servo pressure sensor becomes a target servo pressure;
• and
• is configured to control so as to increase the target servo pressure by a predetermined amount, while the brake actuator is executing the braking control which accompanies a brake fluid pumping back control wherein the brake fluid supplied to the wheel cylinder is pumped back to the master cylinder by the built-in pump.