APPARATUS FOR CONTROLLING ELECTRONIC PARKING BRAKE SYSTEM
The present disclosure relates to a control unit of an electronic parking brake system, including: a plurality of driver circuits which are respectively connected to a first motor and a second motor for providing a driving force to an electronic parking brake to control the first motor and the second motor; a first micro control unit (MCU) which has a plurality of core processors and is connected to a first driver circuit and a second driver circuit receiving a first power according to a reception of an electric parking brake (EPB) switch signal; and a second MCU which has at least one core processor and is connected to a third driver circuit receiving a second power. The control unit can be applied to other exemplary embodiments.
1 . A control unit of an electronic parking brake system, comprising:
a plurality of driver circuits which are respectively connected to a first motor and a second motor for providing a driving force to an electronic parking brake to control the first motor and the second motor;
a first micro control unit (MCU) which is connected to a first driver circuit and a second driver circuit receiving a first power according to a reception of an electric parking brake (EPB) switch signal; and
a second MCU which is connected to a third driver circuit receiving a second power.
2 . The control unit of claim 1 , wherein the second driver circuit receives the first power when a first switch is turned on.
3 . The control unit of claim 2 , wherein the third driver circuit receives the second power when a second switch is turned on.
4 . The control unit of claim 3 , wherein the second switch is turned off when the first MCU operates normally.
5 . The control unit of claim 3 , wherein the second MCU receives the EPB switch signal through in-vehicle communication when a fault occurs in the first MCU.
6 . The control unit of claim 5 , wherein the third driver circuit further comprises:
a cut-off switch for preventing a malfunction of the second MCU when the first MCU operates normally,
wherein the cut-off switch is provided between a low arm and a ground of the third driver circuit.
7 . The control unit of claim 1 , wherein the first MCU and the second MCU perform communication through a data bus.
8 . The control unit of claim 6 , wherein the first driver circuit and the second driver circuit drive a first motor and a second motor, respectively.
9 . The control unit of claim 6 , wherein the third driver circuit drives the second motor.
10 . The control unit of claim 1 , wherein the first MCU has a plurality of core processors, and
wherein the second MCU has at least one core processor.
11 . The control unit of claim 1 , wherein the first MCU and the second MCU are implemented on separate PCBs.
12 . The control unit of claim 3 , wherein the second MCU receives a P-lock switch signal through in-vehicle communication when a fault occurs in the first MCU, and turns on the second switch to control the third driver circuit.
13 . The control unit of claim 12 , wherein the third driver circuit further comprises:
a cut-off switch provided between a low arm and a ground of the third driver circuit,
wherein the cut-off switch is turned on when a fault occurs in the first MCU.
14 . The control unit of claim 3 , wherein the second MCU receives a WSS sensing signal through in-vehicle communication when a fault occurs in the first MCU, and turns on the second switch based on a wheel speed identified from the WSS sensing signal being 0 to control the third driver circuit.
15 . The control unit of claim 14 , wherein the third driver circuit further comprises:
a cut-off switch provided between a low arm and a ground of the third driver circuit,
wherein the cut-off switch is turned on when a fault occurs in the first MCU.
16 . A controlling method of an electronic parking brake system wherein the electronic parking brake system comprises a first micro control unit (MCU) connected to a first driver circuit and a second driver circuit and a second MCU connected to a third driver circuit, comprising:
providing a first power to the first driver circuit and the second driver circuit according to a reception of an electric parking brake (EPB) switch signal, wherein the first driver circuit and the second driver circuit are respectively connected to a first motor and a second motor,
controlling the first motor and the second motor for providing a driving force to an electronic parking brake,
when a fault occurs in the first MCU, providing a second power to a third driver circuit connected to the second motor and controlling the second motor for providing a driving force to an electronic parking brake.
17 . The controlling method of claim 16 , wherein the providing the first power includes providing the first power to the second driver circuit when a first switch is turned on.
18 . The controlling method of claim 17 , wherein the providing the second power includes providing the second power to the third driver circuit when a second switch is turned on.
19 . The controlling method of claim 18 , wherein the second switch is turned off when the first MCU operates normally.
20 . The controlling method of claim 18 , wherein the second MCU receives the EPB switch signal through in-vehicle communication when the fault occurs in the first MCU.