A brake device for a vehicle, comprising:
- a master cylinder unit configured to generate hydraulic pressure by pressing of a pedal;
- a reservoir connected to the master cylinder unit and configured to store oil;
- a driving unit operated by movement of the pedal and configured to receive electric energy through a plurality of batteries to supply rotation power;
- a hydraulic generation unit configured to rotate by receiving the rotation power of the driving unit and generate hydraulic pressure by rotation of a plurality of rotors;
- wheel cylinder units configured to receive the hydraulic pressure generated by the hydraulic generation unit and constrain rotation of wheels;
- and
- a control unit configured to detect whether the driving unit normally operates and control an operation of the driving unit to supply the hydraulic generation unit with the rotation power in an event of abnormal operation of the driving unit,
- wherein:
- the driving unit comprises:
- a 3-phase motor configured to generate the rotation power by supply of electricity;
- a first battery configured to supply power to the 3-phase motor;
- a first inverter configured to convert the power of the first battery into 3-phase power and supply the 3-phase power to the 3-phase motor;
- a second battery configured to supply power to the 3-phase motor together with the first battery;
- and
- a second inverter configured to convert the power of the second battery into 3-phase power and supply the 3-phase power to the 3-phase motor;
- the first inverter comprises:
- a first relay configured to control the supply of the power of the first battery;
- and
- a plurality of first switches configured to convert the power passing through the first relay into 3-phase power;
- the second inverter comprises:
- a second relay configured to control the supply of the power of the second battery;
- and
- a plurality of second switches configured to convert the power passing through the second relay into 3-phase power;
- in response to detection of a failure of the second inverter, the control unit outputs a switching open control signal to the second relay, controls operations of the first relay and the first switches such that output of the first inverter is doubled, and controls and reduces an amount of time the first switches are in operation to one quarter;
- in response to detection of a failure of the second relay, the control unit outputs a switching open control signal to the second switches, controls operations of the first relay and the first switches such that output of the first inverter is doubled, and controls and reduces an amount of time the first switches are in operation to one quarter;
- in response to detection of a failure of the first inverter, the control unit outputs a switching open control signal to the first relay, controls operations of the second relay and the second switches such that output of the second inverter is doubled, and controls and reduces an amount of time the first switches are in operation to one quarter;
- and
- in response to detection of a failure of the first relay, the control unit outputs a switching open control signal to the first switches, controls operations of the second relay and the second switches such that output of the second inverter is doubled, and controls and reduces an amount of time the second switches are in operation to one quarter.