Patent ID: 9016058
Filing Date: 2015-04-28
Classification: B60T

Abstract:
1. A vehicle braking force generator comprising: an electric hydraulic pressure generation unit that includes a cylinder, a piston, and an electric motor which drives the piston via a power transmission mechanism including a speed reducing gear, and when the electric motor is driven according to an operation amount of a braking operation member, by receiving a driving force, the piston moves to a compression direction of a brake fluid with respect to the cylinder via the power transmission mechanism, thereby generating a brake hydraulic pressure corresponding to the operation amount of the brake operation member; a motor current obtaining unit that obtains a motor current according to the electric motor; a brake hydraulic pressure obtaining unit that obtains a brake hydraulic pressure generated in the cylinder; a movement amount obtaining unit that obtains a movement amount of the piston to the compression direction of the brake fluid with respect to the cylinder; and a determination unit that determines an operation state of the electric hydraulic pressure generation unit, wherein when the electric motor is driven according to the operation amount of the braking operation member, the determination unit determines that the electric hydraulic pressure generation unit is in abnormal state if a relationship between the motor current and the brake hydraulic pressure belongs to an abnormality determination range which deviates from a normality determination range having a predetermined width with a positive correlation, and the movement amount is less than a predetermined movement amount threshold value; and wherein when the electric motor is driven according to the operation amount of the braking operation member, the determination unit determines that the electric hydraulic pressure generation unit is in abnormal state if a time variation amount of the motor current is equal to or more than the predetermined variation amount threshold value.