Patent ID: 8500217
Filing Date: 2013-08-06
Classification: B60T

Abstract:
1. A vehicle braking apparatus comprising: an operation member to which an occupant can operate for braking; a master cylinder capable of outputting a predetermined hydraulic pressure by moving a piston according to an operation stroke of the operation member to pressurize a hydraulic fluid; wheel cylinders that generate braking forces for wheels by receiving the hydraulic pressure; a hydraulic passage that connects the master cylinder and the wheel cylinders; a master cut valve capable of opening and closing the hydraulic passage; a pressure control valve capable of regulating and outputting a hydraulic pressure by moving a drive valve due to an electromagnetic force based on a target control pressure according to the operation stroke of the operation member, and capable of regulating and outputting a hydraulic pressure by moving the drive valve due to a hydraulic pressure from the master cylinder as a pilot pressure; a controlled pressure passage capable of supplying the hydraulic pressure from the pressure control valve to the wheel cylinders; a control unit capable of controlling the pressure control valve and the master cut valve; and a pilot passage that supplies the pilot pressure to the pressure control valve and that is connected to the hydraulic passage on a side of the master cut valve closer to the wheel cylinders, wherein when a power supply system is normal, the master cut valve is in a closed state and the hydraulic pressure from the master cylinder does not act on the pressure control valve via the pilot pressure, and when the power supply system fails, the master cut valve is in an open state and the hydraulic pressure from the master cylinder acts on the pressure control valve via the pilot passage, thereby applying controlled pressure to the wheel cylinders.