Vehicle-brake control unit

A vehicle braking device applied to a vehicle including at least a motor as power source and having a multiple-system hydraulic braking circuit, the vehicle braking device comprising:

• a basic-hydraulic-pressure generating section that generates a basic hydraulic pressure according to the operation of a brake operating member by a driver for the respective systems;
• a pressurizing section that can generate pressurizing hydraulic pressure for generating a hydraulic pressure higher than the basic hydraulic pressure;
• a pressure control section that can separately control the amounts of pressurization for the respective systems applied to the basic hydraulic pressure using the pressurizing hydraulic pressure generated by the pressurizing section;
• a regenerative-braking-force control section that controls a regenerative braking force generated by the motor;
• a regenerative cooperative braking control section that controls a complementary braking force according to the operation of the brake operating member so that the characteristic of a total braking force relative to the operation of the brake operating member agrees with a predetermined characteristic, the complementary braking force consisting of the regenerative braking force by the regenerative-braking-force control section and/or a total pressurizing hydraulic braking force that is the sum of the hydraulic braking forces based on the amounts of pressurization for the respective systems by the pressure control section, and the total braking force being the sum of a basic hydraulic braking force based on the basic hydraulic pressure by the basic-hydraulic-pressure generating section and the complementary braking force;
• and
• a pressurization-intensifying section that makes the regenerative cooperative braking control section control the amount of pressurization for a normal system so that, when the pressure control section for one of the systems fails and the pressurization for the failed system cannot be generated, the amount of pressurization for the normal system becomes larger than that for the case where the pressure control section is normal.

A medium for recording a vehicle-brake control program for use in a vehicle braking device applied to a vehicle including at least a motor as power source and having a multiple-system hydraulic braking circuit, the vehicle braking device comprising:

• a basic-hydraulic-pressure generating section that generates a basic hydraulic pressure according to the operation of a brake operating member by a driver for the respective systems;
• a pressurizing section that can generate pressurizing hydraulic pressure for generating a hydraulic pressure higher than the basic hydraulic pressure;
• a pressure control section that can separately control the amounts of pressurization for the respective systems applied to the basic hydraulic pressure using the pressurizing hydraulic pressure generated by the pressurizing section;
• and
• a regenerative-braking-force control section that controls a regenerative braking force generated by the motor;
• the program comprising:
• a regenerative cooperative braking control step that controls a complementary braking force according to the operation of the brake operating member so that the characteristic of a total braking force relative to the operation of the brake operating member agrees with a predetermined characteristic, the complementary braking force consisting of the regenerative braking force by the regenerative-braking-force control section and/or a total pressurizing hydraulic braking force that is the sum of the hydraulic braking forces based on the amounts of pressurization for the respective systems by the pressure control section, and the total braking force being the sum of a basic hydraulic braking force based on the basic hydraulic pressure by the basic-hydraulic-pressure generating section and the complementary braking force;
• and
• a pressurization-intensifying step that makes the regenerative cooperative braking control section control the amount of pressurization for a normal system so that, when the pressure control section for one of the systems fails and the pressurization for the failed system cannot be generated, the amount of pressurization for the normal system becomes larger than that for the case where the pressure control section is normal.