CONTROL DEVICE OF BRAKE SYSTEM
A control device of a brake system, according to the present invention, includes, as redundancy, a first control unit for controlling the valve, the motor and the like of a brake system by receiving a sensor unit input, and a second control unit capable of performing the same function as the first control unit when the first control unit malfunctions, and thus the present invention can control the brake system of a vehicle by using the second control unit in an emergency situation in which the first control unit does not normally operate.
1 . A control device of a brake system, comprising:
a sensor unit including at least one of a pedal sensor, a pressure sensor, and a motor position sensor;
a first control unit which includes at least one of an electronic parking brake (EPB) driver, a valve driver, and a motor driver and includes a first microcontroller unit (MCU) configured to control the EPB driver, the valve driver, and the motor driver according to a signal received from the sensor unit; and
a second control unit which performs the same function as the first control unit and constitutes redundancy of the first control unit.
2 . The control device claim 1 , wherein the second control unit operates only when the first control unit does not operate normally.
3 . The control device of claim 1 , wherein the valve driver includes:
a valve driver included in a separate chip;
a valve driver included in a first application specific integrated circuit (ASIC) chip included in the first control unit; and
a valve driver included in a second ASIC chip included in the second control unit.
4 . The control device of claim 3 , wherein:
the valve drivers included in the first and second ASIC chips drive valves for a function of an electronic stability control (ESC) system or an anti-lock brake system (ABS); and
the valve driver included in the separate chip drives valves for a foot brake function.
5 . The control device of claim 1 , wherein:
the first control unit includes a first motor driver and a first three-phase inverter;
the second control unit includes a second motor driver and a second three-phase inverter; and
the first MCU or the second MCU controls a dual winding motor which is simultaneously connected to the first three-phase inverter of the first control unit and the second three-phase inverter of the second control unit.
6 . The control device of claim 5 , wherein, when the first control unit fails, the second control unit controls the dual winding motor only with the second three-phase inverter and the second motor driver.
7 . The control device of claim 1 , wherein:
the first control unit includes a first car area network (CAN) transceiver;
the second control unit includes a second CAN transceiver; and
the first MCU and the second MCU communicate with each other through the first CAN transceiver and the second CAN transceiver.
8 . The control device of claim 1 , wherein the first MCU and the second MCU communicate with each other through general purpose input/output (GPIO) or universal asynchronous receiver/transmitter (UART).
9 . The control device of claim 7 , wherein:
the first control unit receives a signal value of a sensor connected to the second control unit through the first CAN transceiver; or
the second control unit receives a signal value of a sensor connected to the first control unit through the second CAN transceiver.
10 . The control device of claim 1 , wherein:
the pressure sensor includes a first pressure sensor, a second pressure sensor, and a third pressure sensor;
the first pressure sensor and the second pressure sensor are connected only to the first control unit; and
the third pressure sensor is connected only to the second control unit.
11 . The control device of claim 10 , wherein, when the first control unit fails, the second control unit controls the brake system only with the third pressure sensor in a state in which performance is degraded as compared with a case in which all of the first, second, and third pressure sensors operate.
12 . The control device of claim 1 , wherein:
the pedal sensor has an output of a first channel and an output of a second channel;
the output of the first channel is connected to the first control unit; and
the output of the second channel is connected to the second control unit.
13 . The control device of claim 12 , wherein:
the output of the first channel and the output of the second channel of the pedal sensor output different values according to settings; and
when the first control unit fails, the output of the second channel outputs the same value as the output of the first channel before the first control unit fails.