Brake control system and control method for brake control system

A control method for a brake control system includes:

• a first wheel cylinder for applying braking force to a first wheel;
• a second wheel cylinder for applying braking force to a second wheel;
• a power hydraulic pressure source able to generate, by a supply of power, a high hydraulic pressure independent of a brake operation by a driver;
• a first system which connects the power hydraulic pressure source with both the first and second wheel cylinders, regulates the hydraulic pressure of operating fluid from the power hydraulic pressure source, and applies a common hydraulic pressure to both the first and second wheel cylinders;
• a separator valve that cuts off the supply of operating fluid to the second wheel cylinder via the first system when the separator valve is closed;
• a second system which connects the second wheel cylinder with the power hydraulic pressure source such that operating fluid can be supplied from the power hydraulic pressure source to the second wheel cylinder regardless of whether the separator valve is open or closed;
• and
• a regenerative brake unit that applies braking force to the first wheel by regenerative control of a motor,
• the control method comprising:
• increasing the hydraulic pressure applied to the second wheel cylinder more than the hydraulic pressure applied to the first wheel cylinder under a predetermined condition when the braking force applied to the first wheel is a combination of regenerative braking force and hydraulic pressure braking force.