Patent ID: 8870302

Claim:
A hydraulic brake device comprising: a brake actuation unit to generate a target pressure corresponding to a pedal force from a brake pedal, the brake actuation unit comprising the brake pedal, a master cylinder, a booster, a reservoir, and a wheel cylinder; a hydraulic power unit to supply, to the booster, a brake fluid in an amount corresponding to the pedal force from the brake pedal such that the master cylinder generates the target pressure, the hydraulic power unit comprising a high pressure accumulator charged with the brake fluid under high pressure, a first pressure sensor to sense a pressure of the high pressure accumulator, and a second sensor to sense a pressure of the booster; a third pressure sensor to sense a pressure of the brake fluid supplied from the master cylinder to the wheel cylinder; and a control unit to control the hydraulic power unit, for generation of the target pressure, the control unit determining failure of the second pressure sensor, using correlation of pressure data from the first, second and third pressure sensors, under at least one of the following conditioms: when the pressure sensed by the second pressure sensor is not increased when the pressure sensed by the first pressure sensor is decreased; when a difference between the pressure sensed by the second pressure sensor and the pressure sensed by the third pressure sensor is greater than a predetermined pressure difference; or when the pressure sensed by the third pressure sensor is higher than a first level of the target pressure, and the pressure sensed by the second pressure sensor is lower than a second level of the target pressure.