Brake control device for a vehicle

A brake control device for a vehicle comprising:

• a first wheel brake cylinder equipped to a first vehicle wheel for applying a braking force to the first vehicle wheel;
• a second wheel brake cylinder equipped to a second vehicle wheel for applying a braking force to the second vehicle wheel;
• a hydraulic pressure generating device for generating a hydraulic pressure irrespectively of operation of a brake operating member;
• a hydraulic pressure control valve device disposed between the hydraulic pressure generating device and the first and second wheel brake cylinders for controlling the brake hydraulic pressure in the respective first and second wheel brake cylinders;
• a hydraulic pressure controlling means for controlling the hydraulic pressure control valve device for one of the first and second wheel brake cylinders equipped to one of the first and second vehicle wheels to be controlled in response to a vehicle driving condition for supplying the hydraulic pressure from the hydraulic pressure generating device to the one wheel brake cylinder for the one vehicle wheel to be controlled at least when the brake operating member is not being operated;
• a brake amount detecting means for detecting an operational amount of the brake operating member;
• a vehicle deceleration detecting means for detecting or estimating a vehicle deceleration;
• a wheel brake cylinder hydraulic pressure detecting means for detecting or estimating the brake hydraulic pressure in the respective first and second wheel brake cylinders;
• a non-controlled vehicle wheel controlling means for controlling the hydraulic pressure control valve device for the other one of the first and second vehicle wheels which is not controlled by the hydraulic pressure controlling means so as to control the brake hydraulic pressure in the other wheel brake cylinder equipped to the other vehicle wheel which is not controlled by the hydraulic pressure controlling means in response to the operational amount of the brake operating member when the brake operating member is operated while the hydraulic pressure has been supplied to the one wheel brake cylinder by the hydraulic pressure controlling means, the non-controlled vehicle wheel controlling means including:
• a target vehicle deceleration calculating means for calculating a target vehicle deceleration based upon the brake operating member operational amount detected by the brake amount detecting means;
• a target wheel brake cylinder hydraulic pressure calculating means for calculating a target wheel brake cylinder hydraulic pressure for the other wheel brake cylinder based upon the brake operating member operational amount detected by the brake amount detecting means;
• a deceleration deviation calculating means for calculating a deceleration deviation between the target vehicle deceleration calculated by the target vehicle deceleration calculating means and the vehicle deceleration detected or estimated by the vehicle deceleration detecting means;
• a hydraulic pressure deviation calculating means for calculating a hydraulic pressure deviation between the target wheel brake cylinder hydraulic pressure for the other wheel brake cylinder calculated by the target wheel brake cylinder hydraulic pressure calculating means and the brake hydraulic pressure in the other wheel brake cylinder detected or estimated by the wheel brake cylinder hydraulic pressure detecting means;
• and
• a valve controlling means for controlling the hydraulic pressure control valve device for the other vehicle wheel which is not controlled by the hydraulic pressure controlling means so as to decrease a larger deviation in response to a deviated amount of the larger deviation of either the deceleration deviation calculated by the deceleration deviation calculating means or the hydraulic pressure deviation calculated by the hydraulic pressure deviation calculating means.