Brake device for vehicle
A brake device for a vehicle including: 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.
1. 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.
2. The brake device for a vehicle according to claim 1 , further comprising:
a fluid path part connected to the master cylinder unit, the reservoir, the hydraulic generation unit, and the wheel cylinder units and configured to transmit oil; and
a valve part installed in the fluid path part and configured to control a flow of the oil.
3. The brake device for a vehicle according to claim 2 , wherein the fluid path part comprises:
a first fluid path configured to transmit hydraulic pressure for general braking generated by the hydraulic generation unit to the wheel cylinder units installed on front wheels and rear wheels;
a second fluid path configured to transmit hydraulic pressure for decompression, which is discharged from the hydraulic generation unit, to the reservoir; and
a transmission fluid path configured to connect the master cylinder unit and the first fluid path and supply the first fluid path with hydraulic pressure for emergency braking generated by the master cylinder unit.
4. The brake device for a vehicle according to claim 3 , wherein the first fluid path comprises:
a front fluid path configured to supply the hydraulic pressure to the wheel cylinder units installed on the front wheels;
a rear fluid path configured to supply the hydraulic pressure to the wheel cylinder units installed on the rear wheels;
a connection fluid path configured to connect the front fluid path and the rear fluid path; and
a bridge fluid path configured to connect the connection fluid path and the hydraulic generation unit.
5. The brake device for a vehicle according to claim 4 , wherein the valve part comprises a connection control valve installed in the connection fluid path and configured to control a flow of the hydraulic pressure.