Vehicle brake control device

A vehicle brake control device including:

• wheel cylinders, each of which is provided to each of front-left, front-right, rear-left, and rear-right wheels for receiving a hydraulic pressure of operating fluid to apply braking force to the wheels;
• a power hydraulic pressure generating device that generates a hydraulic pressure even if a brake operation is not performed;
• individual linear control valve devices, each of which is provided to an individual passage of operating fluid leading into each of the wheel cylinders from the power hydraulic pressure generating device for independently adjusting a hydraulic pressure of each of the wheel cylinders;
• a master cylinder that generates a first pedal effort hydraulic pressure and a second pedal effort hydraulic pressure by using a pedal effort caused by a driver's depressing operation on a brake pedal;
• a master hydraulic path including a first pedal effort hydraulic pressure path that supplies the first pedal effort hydraulic pressure to the wheel cylinder for either one of the front-left and front-right wheels, and a second pedal effort hydraulic pressure path that supplies the second pedal effort hydraulic pressure to the wheel cylinder for the other front wheel;
• a master cut valve device that includes a first on-off valve opening and closing the first pedal effort hydraulic path, and a second on-off valve opening and closing the second pedal effort hydraulic path, the first on-off valve and the second on-off valve being a normally opened valve that keeps opened upon non-energization and is closed by energization;
• and
• a hydraulic control unit that controls energization of the individual linear control valve devices to control the hydraulic pressure of each of the wheel cylinders with the first on-off valve and the second on-off valve of the master cut valve device closed,
• the brake control device comprising:
• a front-wheel left-right communication passage that allows communication between the individual passage, which is located between the wheel cylinder for the front-left wheel and the individual linear control valve device, and the individual passage, which is located between the wheel cylinder for the front-right wheel and the individual linear control valve device, via a front-wheel communication on-off valve;
• a rear-wheel left-right communication passage that allows communication between the individual passage, which is located between the wheel cylinder for the rear-left wheel and the individual linear control valve device, and the individual passage, which is located between the wheel cylinder for the rear-right wheel and the individual linear control valve device, via a rear-wheel communication on-off valve;
• and
• a communication control unit that allows the front-wheel communication on-off valve and the rear-wheel communication on-off valve to be opened during a hydraulic control by the hydraulic control unit, wherein
• the front-wheel communication on-off valve is a normally closed valve that keeps closed upon non-energization and is opened due to energization, and the rear-wheel communication on-off valve is a normally opened valve that keeps opened upon non-energization and is closed due to energization.