Vehicular brake device
AssigneeAdvics Co., Ltd.
InventorsTatsushi Kobayashi, Takayuki Yamamoto, Yasuhito Ishida
Life of this patent
Estimating the term…
Abstract
The vehicular brake device includes a determination unit, a ratio setting unit, and the control unit. The determination unit determines the operating condition of a vehicular brake device. The ratio setting unit sets, on the basis of the result of determination by the determination unit, a first ratio which is the ratio of a wheel pressure generated by a piston drive unit to a target wheel pressure, and a second ratio which is the ratio of a wheel pressure generated by a hydraulic pressure adjusting unit to the target wheel pressure. The control unit controls the piston drive unit and the hydraulic pressure adjusting unit on the basis of the first ratio and the second ratio.
Claims8
A vehicular brake device comprising:
- a master cylinder having a master piston and a master chamber whose volume changes with movement of the master piston;
- a piston drive unit that drives the master piston by a force corresponding to a hydraulic pressure of an accumulation unit or a driving force of a motor constituting an electric booster and controls a master pressure which is a hydraulic pressure in the master chamber;
- a hydraulic pressure path connecting the master chamber and a wheel cylinder;
- a hydraulic pressure adjusting unit that has a pump discharging a fluid to the hydraulic pressure path and is configured to be able to pressurize a wheel pressure which is a hydraulic pressure of the wheel cylinder;
- and
- a control unit, said control unit comprising:
- a determination unit that determines an operating condition of the vehicular brake device;
- a target wheel pressure setting unit that sets a target wheel pressure which is a target value of the wheel pressure;
- a ratio setting unit that sets, based on a determination result of the determination unit, a first ratio which is a percentage of the target wheel pressure generated by the piston drive unit and a second ratio which is a percentage of the target wheel pressure generated by the hydraulic pressure adjusting unit;
- and
- an operation control unit that controls the piston drive unit and the hydraulic pressure adjusting unit based on the first ratio and the second ratio, wherein
- the determination unit determines whether the operating condition of the vehicular brake device is a sudden brake operation during which a sudden braking operation is performed, and
- in a case where the determination unit determines that the operating condition of the vehicular brake device is the sudden brake operation, the ratio setting unit increases the first ratio, as compared with a case where the determination unit does not determine that the operating condition of the vehicular brake device is the sudden brake operation.
Dependencies are inferred from the claim text.