Control unit of electronic parking brake system
The present disclosure relates to a device for securing redundancy of an electric parking brake system, which includes a first MCU (micro control unit) having a driver circuit including a first driver circuit and a second driver circuit respectively connected to a first motor and a second motor for providing a driving force to an electric parking brake to control the first motor and the second motor, and a plurality of core processors to control the first driver circuit and the second driver circuit connected according to reception of an electric parking brake (EPB) switch signal, a second MCU having one core processor and connected to the second driver circuit, a first switch for connecting the first MCU and the second driver circuit, and a second switch for connecting the second MCU and the second driver circuit, and it may be applied to other exemplary embodiments.
1 . A control unit of an electric parking brake system, comprising:
a driver circuit including a first driver circuit and a second driver circuit respectively connected to a first motor and a second motor for providing a driving force to an electric parking brake to control the first motor and the second motor;
a first MCU (micro control unit) having a plurality of core processors and controlling the first driver circuit and the second driver circuit connected according to reception of an electric parking brake (EPB) switch signal;
a second sub-MCU having one core processor and connected to at least one of the first driver circuit and the second driver circuit;
a first switch for connecting the first sub-MCU and the second driver circuit; and
a second switch for connecting the second sub-MCU and the second driver circuit.
2 . The control unit of claim 1 , wherein the first MCU and the second MCU perform communication through a data bus.
3 . The control unit of claim 1 , further comprising:
a watchdog counter for monitoring an operation of the second sub-MCU from the outside of the second sub-MCU.
4 . The control unit of claim 2 , wherein the second switch is turned off when the first sub-MCU operates normally.
5 . The control unit of claim 2 , wherein the second sub-MCU receives the EPB switch signal through in-vehicle communication when a fault occurs in the first sub-MCU, and turns on the second switch to control the second driver circuit.
6 . The control unit of claim 1 , further comprising:
a third switch for connecting the first sub-MCU and the first driver circuit.
7 . The control unit of claim 6 , further comprising:
a fourth switch for connecting the second sub-MCU and the first driver circuit.
8 . The control unit of claim 7 , wherein when the first sub-MCU operates normally, the first switch and the third switch are turned on to control the first driver circuit and the second driver circuit.
9 . The control unit of claim 7 , wherein the second sub-MCU receives the EPB switch signal through in-vehicle communication when a fault occurs in the first sub-MCU, and turns on the second switch and the fourth switch to control the first driver circuit and the second driver circuit.
10 . The control unit of claim 4 , wherein the second driver circuit further comprises:
a cut-off switch for preventing a malfunction of the second sub-MCU when the first sub-MCU operates normally,
wherein the cut-off switch is provided between a low arm of the second driver circuit and a ground.