Integrated electronic brake system and control method thereof

A method of controlling an integrated electronic brake system comprising a main control section configured in a first area, a sub-control section configured in a second area, and a connection bus configured to connect the first area and the second area for transferring transmission/reception signals between the main control section and the sub-control section, the main control section comprising:

• a first pedal signal input part configured to receive a pedal stroke value from a pedal sensor;
• a cylinder pressure input part configured to receive a cylinder pressure value from a cylinder pressure sensor;
• a first wheel speed input part configured to receive a wheel speed value from a wheel speed sensor and to decode the wheel speed value;
• an electronic parking brake (EPB) signal input part configured to receive an EPB signal;
• an EPB driving part configured to drive a parking brake;
• a main braking valve driving part configured to drive a main braking valve for a main braking operation of a vehicle;
• an additional braking valve driving part configured to drive an additional braking valve for an additional braking operation of the vehicle;
• a motor driving part configured to drive a braking motor;
• a first micro control unit (MCU) configured to control the main braking valve driving part, the additional braking valve driving part, the motor driving part, and the EPB driving part depending on signals input from any one or more of the first pedal signal input part, the cylinder pressure input part, the first wheel speed input part, or the EPB signal input part, the sub-control section comprising:
• a second pedal signal input part configured to receive a pedal stroke value from the pedal sensor;
• a second wheel speed input part configured to receive a wheel speed value from the wheel speed sensor and to decode the wheel speed value;
• a bypass circuit part configured to switch the control path to control the main braking valve driving part and the motor driving part of the main control section;
• a second micro control unit (MCU) configured to control the main braking valve driving part, the motor driving part, and the EPB driving part depending on signals input from any one or more of the second pedal signal input part, the second wheel speed input part, and the EPB signal input part, the method comprising:
• receiving, by the first MCU, any one or more of a pedal stroke value from the first pedal signal input part, a value from the cylinder pressure sensor, a wheel speed value from the wheel speed sensor, or an EPB signal, performing EPB control, driving the main braking valve and the braking motor for the main braking operation of the vehicle depending on manipulation of a pedal, and driving the additional braking valve for the additional braking operation;
• monitoring, by the second MCU, an input of a driving signal for driving the sub-control section;
• when the input of the driving signal has been checked, receiving, by the second MCU, any one or more of a pedal stroke value from the second pedal signal input part of the sub-control section, a wheel speed value from the second wheel speed input part of the sub-control section, or an EPB signal from the EPB signal input part;
• and
• controlling, by the second MCU, the main braking valve driving part, the motor driving part, and the EPB driving part of the main control section through the bypass circuit part of the sub-control section depending on the one or more of the pedal stroke value, the wheel speed value, or the EPB signal,
• wherein:
• in an event of a failure of the main control section, the second MCU of the sub-control section controls the main braking valve driving part and the motor driving part to drive a main braking valve and a braking motor for the main braking operation of the vehicle by switching a control path through the bypass circuit part of the sub-control section,
• the second MCU has a lower performance specification than the first MCU of the main control section such that the first MCU performs the main braking operation and the additional braking operation while the second MCU performing only the main braking operation and not performing the additional braking operation.