Patent ID: 9475474
Filing Date: 2016-10-25
CPC Classification: B60T

Claim Text:
1. A vehicle brake device for applying a friction braking force generated by a friction brake device provided at the vehicle wheel by supplying a brake fluid to a wheel cylinder of the friction brake device, the vehicle brake device comprising a brake operating member; a brake operating amount detecting means for detecting an operating amount of the brake operating member; a target servo pressure setting means for setting a target servo pressure based on the operating amount of the brake operating member detected by the brake operating amount detecting means; a servo pressure generating portion for generating a servo pressure; a linear valve for controlling the servo pressure generating portion so that the servo pressure generated by the servo pressure generating portion becomes the target servo pressure; and a vehicle stopping state judging means for judging whether a vehicle is stopped or not, wherein the target servo pressure setting means sets the target servo pressure based on the operating amount of the brake operating member when the vehicle stopping state judging means judges that the vehicle is not stopped, and the target servo pressure setting means sets the target servo pressure during one braking operation when the vehicle stopping state judging means judges that the vehicle is stopped, a reference servo pressure being set as the target servo pressure, when a calculated servo pressure calculated in response to the operating amount of the brake operating member is within a servo pressure change threshold value defined with a predetermined deviation from the reference servo pressure or the target servo pressure being set by adding or subtracting a predetermined pressure to or from the reference servo pressure, the reference servo pressure being set based on the operating amount of the brake operating member at the time of vehicle being stopped, the reference servo pressure being set to be constant when the calculated servo pressure is within the servo pressure change threshold value, the reference servo pressure being reset based on the operating amount of the brake operating member at the time when the calculated servo pressure exceeds the servo pressure change threshold value.