Electronic parking brake control system

Abstract

The application discloses an electronic parking control system, comprising: at least two EPB control circuits, each of which is communicatively connected, and each of which comprises a control module and a driving module; the control module is electrically connected with the input end of the driving module, the output end of the driving module is electrically connected with the motor of a vehicle, the control module is used for sending a first control signal to the driving module when receiving a parking instruction, the driving module is used for sending a driving signal to the motor connected therewith according to the first control signal, and the motor is used for driving the caliper of the vehicle to act according to the driving signal; the control module is also used for controlling the driving module to stop outputting the driving signal to the motor when detecting a self-fault and / or a motor fault; wherein the calipers driven by the motors connected with different EPB control circuits are different. The application realizes the fault monitoring of the motor and / or the control module, can output alarm information in time, and thus improves the reliability of the electronic parking control system.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile control, and in particular to an electronic parking control system. Background Art

[0002] The Electronic Parking Brake (EPB) system can be used to temporarily apply the parking brake while driving and to permanently hold the vehicle after stopping. The system electronically controls the parking brake. The EPB system also enables automatic parking with the engine off, automatic parking with the door open, emergency braking, autohold, and hill start. The driver can activate all EPB system functions simply by operating the EPB switch from the driving position.

[0003] The existing electronic parking control system detects the driver's pulling up and pressing the EPB switch signal to analyze whether the driver needs to park and release the EPB, and then controls the motor to rotate forward and reverse, push the brake to clamp and release, and realize the parking and release functions of the EPB.

[0004] Existing electronic parking control systems have a high probability of failure and low reliability, and cannot ensure the safety of vehicle parking. Summary of the Invention

[0005] The present invention provides an electronic parking control system, which realizes the fault monitoring of the motor and / or the control module, and can output alarm information in time, thereby improving the reliability of the electronic parking control system.

[0006] The present invention provides an electronic parking control system, comprising: at least two EPB control circuits, each EPB control circuit being communicatively connected, the EPB control circuit comprising a control module and a drive module; the control module being electrically connected to an input end of the drive module, and the output end of the drive module being electrically connected to a motor of a vehicle, the control module being configured to send a first control signal to the drive module upon receiving a parking instruction, the drive module being configured to send a drive signal to a correspondingly connected motor according to the first control signal, the motor being configured to drive a caliper of the vehicle to perform an action according to the drive signal; the control module being further configured to control the drive module to stop outputting the drive signal to the motor upon detecting a fault in itself and / or a fault in the motor; wherein the motors connected to different EPB control circuits drive different calipers.

[0007] Optionally, the control module comprises a power supply monitoring unit, a power supply control unit and a master control unit; the input end of the power supply monitoring unit is in communication connection with the first communication port of the master control unit, the output end of the power supply monitoring unit is connected with the control end of the power supply control unit, and the power supply monitoring unit is used for outputting a fault signal when a fault occurs in itself or the master control unit; the first output end of the power supply control unit is connected with the first input end of the driving module, the second output end of the power supply control unit is connected with the second input end of the driving module, and the power supply control unit is used for controlling the driving module to stop outputting the driving signal according to the fault signal inputted by the control end; the first output end and the second output end of the master control unit are respectively connected with the first input end and the second input end of the driving module, and the master control unit is used for sending a first control signal to the driving module when receiving a parking instruction.

[0008] Optionally, the power supply control unit comprises a first transistor, a first resistor, a first diode and a second diode; the base of the first transistor is used as the control end of the power supply control unit, the first pole of the first transistor is connected with the first end of the first resistor and the anode of the first diode respectively, the second pole of the first transistor is grounded, and the second end of the first resistor is connected with the first power supply; the cathode of the first diode is used as the first output end of the power supply control unit, the anode of the second diode is connected with the anode of the first diode, and the cathode of the second diode is used as the second output end of the power supply control unit.

[0009] Optionally, the driving module is further used for detecting a motor fault; the second communication port of the master control unit is connected with the first output end of the driving module, and the master control unit is used for controlling the driving module to stop outputting the driving signal when the motor fault is acquired by the driving module.

[0010] Optionally, the EPB control circuit further comprises a back-drawing module; the first input end of the back-drawing module is connected with the first output end of the master control unit, the first output end of the back-drawing module is connected with the first input end of the master control unit, the second input end of the back-drawing module is connected with the second output end of the master control unit, the second output end of the back-drawing module is connected with the second input end of the master control unit, and the back-drawing module is used for monitoring the first control signal of the first output end and the second output end of the master control unit, and controlling the driving module to stop outputting the driving signal when a fault occurs in the first control signal.

[0011] Optionally, the driving module comprises an H-bridge driving unit and an H-bridge unit; the input end of the H-bridge unit is connected with the first output end, the second output end, the third output end, the fourth output end, the fifth output end, the sixth output end and the seventh output end of the H-bridge driving unit respectively, the output end of the H-bridge unit is connected with the motor, the first end of the H-bridge unit is connected with the second power supply, and the second end of the H-bridge unit is grounded; the H-bridge unit is used for outputting the driving signal to control the motor to work according to the second control signal outputted by the output end of the H-bridge driving unit.

[0012] Optionally, the EPB control circuit also includes a first current detection module and a second current detection module; the first end of the first current detection module is connected to the positive pole of the first analog signal input end of the H-bridge drive unit, and the second end of the first current detection module is respectively connected to the negative pole of the first analog signal input end of the H-bridge drive unit and the first end of the H-bridge unit; the first end of the second current detection module is connected to the positive pole of the second analog signal input end of the H-bridge drive unit, and the second end of the second current detection module is respectively connected to the negative pole of the second analog signal input end of the H-bridge drive unit and the second end of the H-bridge unit; the first current detection module and the second current detection module are used to collect the output current of the H-bridge unit, and the H-bridge drive unit is also used to control the H-bridge unit to stop outputting the drive signal when the output current of the H-bridge unit is greater than the set current.

[0013] Optionally, the H-bridge unit includes a second transistor, a third transistor, a fourth transistor and a fifth transistor; the gate of the second transistor is connected to the first output terminal of the H-bridge driving unit, the first electrode of the second transistor is connected to the first electrode of the third transistor, the second electrode of the second transistor is connected to the first electrode of the third transistor, and the first electrode of the second transistor serves as the first end of the H-bridge unit; the gate of the third transistor is connected to the second output terminal of the H-bridge driving unit, and the second electrode of the third transistor is connected to the first electrode of the fourth transistor; the gate of the fourth transistor is connected to the third output terminal of the H-bridge driving unit, the first electrode of the fourth transistor is connected to the fourth output terminal of the H-bridge driving unit, the second electrode of the fourth transistor is connected to the second electrode of the fifth transistor, and the second electrode of the fourth transistor serves as the second end of the H-bridge unit; the gate of the fifth transistor is connected to the fifth output terminal of the H-bridge driving unit, the first electrode of the fifth transistor is connected to the sixth output terminal of the H-bridge driving unit, and the second electrode of the fifth transistor is connected to the seventh output terminal of the H-bridge driving unit.

[0014] Optionally, the electronic parking control system includes a first area controller and a second area controller, and at least two EPB control circuits include a first EPB control circuit and a second EPB control circuit, the first EPB control circuit is integrated in the first area controller, and the second EPB control circuit is integrated in the second area controller; the first area controller and the second area controller also include an input and output module, the input and output module is electrically connected to the control module, and the input and output module is also connected to the vehicle external sensors and / or loads at the vehicle component structure, and the control module is also used to control the vehicle component structure to take action according to the signals collected from the vehicle external sensors and / or loads through the input and output modules.

[0015] Optionally, the first zone controller further includes an EPB switch detection circuit, and the EPB switch detection circuit is connected to the driving module in the first EPB control circuit.

[0016] The electronic parking control system provided by an embodiment of the present invention includes: at least two EPB control circuits, the EPB control circuit includes a control module and a drive module; by detecting its own faults through the control module and detecting motor faults through the drive module, motor fault and / or control module fault monitoring is achieved, and alarm information can be output in time, thereby improving the reliability of the electronic parking control system; by setting different calipers driven by motors connected to different EPB control circuits, when one EPB control circuit fails, the other EPB control circuit can still implement part of the EPB function, reducing the failure probability of the electronic parking control system, thereby improving the reliability of the electronic parking control system.

[0017] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 1 is a schematic structural diagram of an electronic parking control system provided by an embodiment of the present invention;

[0020] Figure 2 1 is a schematic structural diagram of an EPB control circuit provided by an embodiment of the present invention;

[0021] Figure 3 2 is a schematic structural diagram of another EPB control circuit provided by an embodiment of the present invention;

[0022] Figure 4 2 is a schematic structural diagram of another EPB control circuit provided by an embodiment of the present invention;

[0023] Figure 5 This is a schematic structural diagram of another electronic parking control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0026] Figure 1 FIG. 1 is a schematic diagram of the structure of an electronic parking control system provided by an embodiment of the present invention. Figure 1 As shown, the electronic parking control system 100 includes at least two EPB control circuits ( Figure 1 A schematic diagram shows a case where at least two EPB control circuits include a first EPB control circuit 10 and a second EPB control circuit 20 , and the EPB control circuits are communicatively connected.

[0027] The EPB control circuit includes a control module 11 and a drive module 12. The control module 11 is electrically connected to the input end of the drive module 12, and the output end of the drive module 12 is electrically connected to the vehicle's motor. Upon receiving a parking command, the control module 11 is configured to send a first control signal to the drive module 12. The drive module 12 is configured to send a drive signal to the corresponding motor based on the first control signal. The motor is configured to drive the vehicle's calipers to operate based on the drive signal. The control module 11 is also configured to control the drive module 12 to stop outputting the drive signal to the motor when it detects a fault in the control module and / or a motor fault. Different EPB control circuits are connected to motors that drive different calipers.

[0028] Optionally, the first EPB control circuit 10 and the second EPB control circuit 20 are connected to the vehicle body CAN bus through CAN signal circuit respectively, and communication is established between the first EPB control circuit 10 and the second EPB control circuit 20 and other modules of the vehicle. The first EPB control circuit 10 and the second EPB control circuit 20 can be arranged in the same area controller or in different area controllers. The first EPB control circuit 10 is connected with the first motor 30, and the second EPB control circuit 20 is connected with the second motor 40. The first motor 30 is used to drive the front caliper of the vehicle, and the second motor 40 is used to drive the rear caliper of the vehicle. By arranging different EPB control circuits connected to the motor driven caliper, when one EPB control circuit fails, the other EPB control circuit can still realize partial EPB function. For example, when the first EPB control circuit 10 fails and the second EPB control circuit 20 works normally, the first motor 30 cannot work, so the front caliper driven by the first motor 30 is invalid, and the second motor 40 works normally, so the rear caliper driven by the second motor 40 can still act, realizing the parking function.

[0029] The control module 11 can include a micro control unit. The control module 11 can include a single chip microcomputer, and can also include a digital signal processor (DSP) or a field programmable gate array (FPGA). A watchdog circuit in the form of a question and answer inside the control module 11 can monitor the working state of the control module 11 itself. When the control module 11 fails and the program runs away, a fault signal can be output to control the driving module 12 to stop outputting the driving signal to the motor.

[0030] The driving module 12 converts the first control signal into a driving signal to control the motor to work or stop working. The driving module 12 can also perform real-time motor fault monitoring. When the driving module 12 detects that the motor has a fault, the control module 11 controls the driving module 12 to stop outputting the driving signal.

[0031] With reference to Figure 1 The working process of the electronic parking control system is as follows:

[0032] When the first EPB control circuit 10 is connected to the EPB switch, after the driver actuates the EPB switch, the driving module 12 in the first EPB control circuit 10 detects that the state of the EPB switch changes (i.e. the driver has a parking requirement), and the driving module 12 in the first EPB control circuit sends a first wake-up signal to the control module 11 to wake up the sleeping control module 11, and at the same time the first EPB control circuit transmits the state of the EPB switch to the second EPB control circuit 20 through CAN communication.

[0033] Each EPB control circuit control module 11 then sends a second wake-up signal to the drive module 12, fully waking up the drive module 12. After fully waking up the drive module 12, the control module 11 sends a first control signal to the drive module 12. Based on the first control signal, the drive module 12 sends a drive signal to the corresponding connected motor, causing the motor to rotate, thereby causing the electronic caliper to clamp the friction plate to perform the parking operation.

[0034] During the motor drive process, the internal question-and-answer watchdog circuit of the control module 11 can monitor the working status of the control module 11 itself. When the control module 11 fails and the program is out of control, it can output a fault signal and control the drive module 12 to stop outputting the drive signal to the motor. At the same time, the drive module 12 can also monitor the motor fault in real time. When the drive module 12 detects that the motor has failed, the control module 11 controls the drive module 12 to stop outputting the drive signal.

[0035] When there is no EPB switch signal input, the entire electronic parking control system can be in a dormant state, which can reduce power consumption.

[0036] The electronic parking control system provided by an embodiment of the present invention includes: at least two EPB control circuits, the EPB control circuit includes a control module and a drive module; by detecting its own faults through the control module and detecting motor faults through the drive module, motor fault and / or control module fault monitoring is achieved, and alarm information can be output in time, thereby improving the reliability of the electronic parking control system; by setting different calipers driven by motors connected to different EPB control circuits, when one EPB control circuit fails, the other EPB control circuit can still implement part of the EPB function, reducing the failure probability of the electronic parking control system, thereby improving the reliability of the electronic parking control system.

[0037] Figure 2 This is a schematic diagram of the structure of an EPB control circuit provided by an embodiment of the present invention, with reference to Figure 2 Optionally, the control module 11 includes a power monitoring unit 110 , a power control unit 111 and a main control unit 112 .

[0038] The input end of the power monitoring unit 110 is communicatively connected to the first communication port SPI1 of the main control unit 112, and the output end PMIC_SS of the power monitoring unit 110 is connected to the control end of the power control unit 111. The power monitoring unit 110 is used to output a fault signal when a fault occurs in itself or in the main control unit 112.

[0039] The first output end of the power control unit 111 is connected to the first input end ACT_OFF_LS1 of the driving module 12, and the second output end of the power control unit 111 is connected to the second input end ACT_OFF_LS2 of the driving module 12. The power control unit 111 is used to control the driving module 12 to stop outputting the driving signal according to the fault signal input by the control end.

[0040] The first output terminal OUT1 and the second output terminal OUT2 of the main control unit 112 are respectively connected to the first input terminal ACT_OFF_LS1 and the second input terminal ACT_OFF_LS2 of the driving module 12. The main control unit 112 is configured to send a first control signal to the driving module 12 upon receiving a parking instruction.

[0041] The power supply terminal of the power monitoring unit 110 is connected to the second power supply VCC2, and the power monitoring unit 110 is used to provide the first power supply to the EPB control circuit. The first power supply VCC1 can be 5V, and the second power supply VCC2 can be 12V.

[0042] Optionally, the power monitoring unit 110 may be a power management integrated circuit (PMIC). The PMIC may be a chip with the highest functional safety level (ASIL D). For example, the PMIC may be a TLF35584. A watchdog circuit in the form of a question-and-answer system within the PMIC may monitor the operating status of the main control unit 112. When the main control unit 112 fails and the program fails, the PMIC may output a fault signal. The fault signal may be a low-level signal or a high-level signal.

[0043] Optionally, the power control unit 111 includes a first transistor T1, a first resistor R1, a first diode D2, and a second diode D2. The base of the first transistor T1 serves as a control terminal of the power control unit 111, the first electrode of the first transistor T1 is connected to the first terminal of the first resistor R1 and the anode of the first diode D1, respectively, the second electrode of the first transistor T1 is grounded, and the second terminal of the first resistor R1 is connected to a first power supply VCC1; the cathode of the first diode D1 serves as a first output terminal of the power control unit 111, the anode of the second diode D2 is connected to the anode of the first diode D1, and the cathode of the second diode D2 serves as a second output terminal of the power control unit 111.

[0044] The first transistor T1 may be an N-type transistor or a P-type transistor. Figure 2The schematic diagram shows the case where the first transistor T1 is an N-type transistor. When the first transistor T1 is an N-type transistor, the fault signal is a low-level signal. In other words, when the output terminal PMIC_SS of the power monitoring unit 110 outputs a fault signal, the first transistor T1 is turned off. The first resistor R1 is a current-limiting resistor, and the first diode D1 and the second diode D2 are anti-reverse diodes.

[0045] Optionally, the main control unit 112 may include a microcontroller (MCU). For example, the main control unit 112 may be a single-chip microcomputer, a digital signal processor (DSP), or a field programmable gate array (FPGA). For example, the main control unit 112 may be a TC389.

[0046] the second communication port SPI2 of the main control unit 112 is connected to the first output terminal of the drive module 12, and the main control unit 112 is used to control the drive module 12 to stop outputting the drive signal when the motor fails.

[0047] Specifically, when the driving module 12 detects that the motor fails, the main control unit 112 reads the motor failure signal stored in the register of the driving module 12 through the second communication port SPI2 and controls the driving module 12 to stop outputting the driving signal.

[0048] The EPB control circuit also includes a recovery module 13, a first input end of the recovery module 13 is connected to the first output end OUT1 of the main control unit 112, a first output end of the recovery module 13 is connected to the first input end MCU_IN1 of the main control unit 112, a second input end of the recovery module 13 is connected to the second output end OUT2 of the main control unit 112, and a second output end of the recovery module 13 is connected to the second input end MCU_IN2 of the main control unit 112. The recovery module 13 is used to monitor the first control signal of the first output end OUT1 and the second output end OUT2 of the main control unit 112. When the first control signal fails, the control drive module 12 stops outputting the drive signal to the motor.

[0049] Optionally, the recovery module 13 includes a second resistor R2 and a third resistor R3; the first end of the second resistor R2 serves as the first input end of the recovery module 13, and the second end of the second resistor R2 serves as the first output end of the recovery module 13; the first end of the third resistor R3 serves as the second input end of the recovery module 13, and the second end of the third resistor R3 serves as the second output end of the recovery module 13.

[0050] The first control signal outputted from the first output terminal OUT1 and the second output terminal OUT2 of the main control unit 112 is recovered through the second resistor R2 and the third resistor R3 to ensure that the first control signal is correct, thereby improving the reliability of the electronic parking control system.

[0051] To prevent the fault signal PMIC_SS output by the power monitoring unit 110 from interfering with the first control signal output by the first output terminal OUT1 and the second output terminal OUT2 of the main control unit 112, the EPB control circuit includes a third diode D3 and a fourth diode D4. The anode of the third diode D3 is connected to the first output terminal OUT1 of the main control unit 112, and the cathode of the third diode D3 is connected to the cathode of the first diode D1. The anode of the fourth diode D4 is connected to the second output terminal OUT2 of the main control unit 112, and the cathode of the fourth diode D4 is connected to the cathode of the second diode D2.

[0052] Continue to refer Figure 2 , the working principle of the EPB control circuit is:

[0053] When the first EPB control circuit 10 is connected to the EPB switch and the driver toggles the EPB switch, the driver module 12 in the first EPB control circuit 10 detects a change in the EPB switch state (i.e., the driver has requested parking). The driver module 12 in the first EPB control circuit 10 sends a first wake-up signal to the main control unit 112 via the first wake-up signal output terminal WAU_OUT, waking the driver. The main control unit 112 in the first EPB control circuit 10 simultaneously transmits the EPB switch state to the main control unit 112 in the second EPB control circuit 20 via CAN communication.

[0054] The main control unit 112 in each EPB control circuit sends a second wake-up signal to the driver module 12 via the third output terminal MCU_EPB_WAU, fully waking up the driver module 12. After fully waking up the driver module 12, the main control unit 112 sends a first control signal to the driver module 12 via the first output terminal OUT1 and the second output terminal OUT2. In response to the first control signal, the driver module 12 sends a drive signal to the corresponding connected motor, causing the motor to rotate, thereby causing the electronic caliper to clamp the friction plate to perform the parking operation.

[0055] During the motor driving process, the watchdog circuit in the form of question and answer inside the power monitoring unit 110 can monitor the working status of the main control unit 112 and the power monitoring unit 110 itself. When the power monitoring unit 110 itself fails or detects that the main control unit 112 has failed, the output terminal PMIC_SS of the power monitoring unit 110 can output a fault signal. At this time, the first transistor T1 is cut off, and the first power supply will output a high level through the first resistor R1. After passing through the first diode D1 and the second diode D2 of the anti-reverse diode, it is connected to the first input terminal ACT_OFF_LS1 and the second input terminal ACT_OFF_LS2 of the driving module 12, turning off the MOSFET tube in the driving module 12, thereby interrupting the motor drive.

[0056] The driving module 12 can detect various faults occurring in the external motor. When the driving module 12 detects a motor fault, the main control unit 112 reads the motor fault signal stored in the register of the driving module 12 through the second communication port SPI2 and controls the driving module 12 to stop outputting the driving signal.

[0057] The second resistor R2 and the third resistor R3 in the recovery module 13 can recover the first control signal output from the first output terminal OUT1 and the second output terminal OUT2 of the main control unit 112 to ensure that the first control signal is correct, thereby improving the reliability of the electronic parking control system.

[0058] Figure 3 This is a structural diagram of another EPB control circuit provided by an embodiment of the present invention, referring to Figure 3 Optionally, the driving module 12 includes an H-bridge driving unit 120 and an H-bridge unit 121 .

[0059] The input end of the H-bridge unit 121 is respectively connected to the first output end, the second output end, the third output end, the fourth output end, the fifth output end, the sixth output end and the seventh output end of the H-bridge driving unit 120, the output end of the H-bridge unit 121 is connected to the motor, the first end of the H-bridge unit 121 is connected to the second power supply VCC2, and the second end of the H-bridge unit 121 is grounded; the H-bridge unit 121 is used to output a driving signal according to the second control signal output by the output end of the H-bridge driving unit 120 to control the operation of the motor.

[0060] Optionally, the H-bridge driving unit 120 comprises an H-bridge driving chip U1, a sixth resistor R6 and a seventh resistor R7. The first input end and the second input end of the H-bridge driving chip 120 are respectively used as the first input end ACT_OFF_LS1 and the second input end ACT_OFF_LS2 of the driving module 12. The first end of the sixth resistor R6 is connected with the first input end of the H-bridge driving chip U1, and the second end of the seventh resistor R7 is grounded. The first end of the seventh resistor R7 is connected with the second input end of the H-bridge driving chip U1, and the second end of the seventh resistor R7 is connected with the second end of the sixth resistor R6. The sixth resistor R6 and the seventh resistor R7 are pull-down resistors. The H-bridge driving chip U1 can be a chip with the highest safety level ASILD. Exemplarily, the H-bridge driving chip U1 can be L9370.

[0061] Optionally, the H-bridge unit 121 comprises a second transistor T2, a third transistor T3, a fourth transistor T4 and a fifth transistor T5.

[0062] The gate of the second transistor T2 is connected with the first output end of the H-bridge driving unit 120, the first pole of the second transistor T2 is connected with the first pole of the third transistor T3, the second pole of the second transistor T2 is connected with the first pole of the fourth transistor, and the first pole of the second transistor is used as the first end of the H-bridge unit. The gate of the third transistor is connected with the second output end of the H-bridge driving unit, the second pole of the third transistor is connected with the first pole of the fourth transistor. The gate of the fourth transistor is connected with the third output end of the H-bridge driving unit, the first pole of the fourth transistor is connected with the fourth output end of the H-bridge driving unit, the second pole of the fourth transistor is connected with the second pole of the fifth transistor, and the second pole of the fourth transistor is used as the second end of the H-bridge unit. The gate of the fifth transistor is connected with the fifth output end of the H-bridge driving unit, the first pole of the fifth transistor is connected with the sixth output end of the H-bridge driving unit 120, and the second pole of the fifth transistor is connected with the seventh output end of the H-bridge driving unit.

[0063] The EPB control circuit further comprises a first current detection module 14 and a second current detection module 15. The first end of the first current detection module 14 is connected with the positive pole AIN1+ of the first analog signal input end of the H-bridge driving unit, and the second end of the first current detection module 14 is respectively connected with the negative pole AIN1- of the first analog signal input end of the H-bridge driving unit 120 and the first end of the H-bridge unit 121. The first end of the second current detection module 15 is connected with the positive pole AIN2+ of the second analog signal input end of the H-bridge driving unit 120, and the second end of the second current detection module 15 is respectively connected with the negative pole AIN2- of the second analog signal input end of the H-bridge driving unit 120 and the second end of the H-bridge unit 121.

[0064] The first current detection module 14 and the second current detection module 15 are used to collect the output current of the H-bridge unit 121 . The H-bridge driving unit 120 is further used to control the H-bridge unit 121 to stop outputting the driving signal when the output current of the H-bridge unit 121 is greater than a set current.

[0065] Optionally, the first current detection module 14 includes a fourth resistor R4, and the second current detection module 15 includes a fifth resistor R5; the first end of the fourth resistor R4 serves as the first end of the first current detection module 14, and the second end of the fourth resistor R4 serves as the second end of the first current detection module 14; the first end of the fifth resistor R5 serves as the first end of the second current detection module 15, and the second end of the fifth resistor R5 serves as the second end of the second current detection module 15.

[0066] The analog signal input terminal of the H-bridge drive unit 120 measures the voltage difference between the fourth resistor R4 and the fifth resistor R5, thereby converting the current value flowing through the motor (i.e., the output current of the H-bridge unit 121). When the output current of the H-bridge unit 121 is greater than the set current, the H-bridge unit 121 is controlled to stop outputting the drive signal to avoid an overcurrent fault in the motor.

[0067] Figure 4 This is a structural diagram of another EPB control circuit provided by an embodiment of the present invention, referring to Figure 4 The EPB control circuit includes a control module 11 and a drive module 12 .

[0068] The control module 11 includes a power monitoring unit 110, a power control unit 111, and a main control unit 112. The power control unit 111 includes a first transistor T1, a first resistor R1, a first diode D2, and a second diode D3.

[0069] The driving module 12 includes an H-bridge driving unit 120 and an H-bridge unit 121. The H-bridge driving unit 120 includes an H-bridge driving chip U1, a sixth resistor R6, and a seventh resistor R7. The H-bridge unit 121 includes a second transistor T2, a third transistor T3, a fourth transistor T4, and a fifth transistor T5.

[0070] The EPB control circuit also includes a recovery module 13, which includes a second resistor R2 and a third resistor R3; the EPB control circuit also includes a first current detection module 14 and a second current detection module 15, the first current detection module 14 includes a fourth resistor R4, and the second current detection module 15 includes a fifth resistor R5; the EPB control circuit also includes a third diode D3 and a fourth diode D4.

[0071] Continue to refer Figure 4 , the working principle of the EPB control circuit is:

[0072] When the first EPB control circuit 10 is connected to the EPB switch, the driver toggles the EPB switch, and the driver module 12 in the first EPB control circuit 10 detects a change in the EPB switch state (i.e., the driver has requested parking). The H-bridge driver chip U1 in the first EPB control circuit 10 sends a first wake-up signal to the main control unit 112 via the first wake-up signal output terminal WAU_OUT, waking up the main control unit 112 in the first EPB control circuit 10. Simultaneously, the first EPB control circuit 10 transmits the EPB switch state to the main control unit 112 in the second EPB control circuit 20 via CAN communication.

[0073] The main control unit 112 in each EPB control circuit sends a second wake-up signal to the H-bridge driver chip U1 via the third output terminal MCU_EPB_WAU, fully waking up the H-bridge driver chip U1. After fully waking up the H-bridge driver chip U1, the main control unit 112 sends a first control signal to the H-bridge driver chip U1 via the first output terminal OUT1 and the second output terminal OUT2. Based on the first control signal, the H-bridge driver chip U1 sends a drive signal to the corresponding connected motor, causing the motor to rotate, thereby causing the electronic caliper to clamp the friction plate to perform the parking operation.

[0074] During the motor driving process, the watchdog circuit in the form of question and answer inside the power monitoring unit 110 can monitor the working status of the main control unit 112 and the power monitoring unit 110 itself. When the power monitoring unit 110 itself fails or detects that the main control unit 112 has failed, the output terminal PMIC_SS of the power monitoring unit 110 can output a fault signal. At this time, the first transistor T1 is cut off, and the first power supply will output a high level through the first resistor R1. After passing through the first diode D1 and the second diode D2 of the anti-reverse diode, it is connected to the first input terminal ACT_OFF_LS1 and the second input terminal ACT_OFF_LS2 of the H-bridge driver chip U1, turning off the fourth transistor T4 and the fifth transistor T5, thereby interrupting the motor driving.

[0075] The H-bridge driver chip U1 can detect various faults occurring in the external motor. When the H-bridge driver chip U1 detects a motor fault, the main control unit 112 reads the motor fault signal stored in the register of the driver module 12 through the second communication port SPI2 and controls the H-bridge driver chip U1 to stop outputting the drive signal.

[0076] The second resistor R2 and the third resistor R3 in the recovery module 13 can recover the first control signal output from the first output terminal OUT1 and the second output terminal OUT2 of the main control unit 112 to ensure that the first control signal is correct, thereby improving the reliability of the electronic parking control system.

[0077] Figure 5FIG. 1 is a structural diagram of another electronic parking control system provided by an embodiment of the present invention. Figure 5 As shown, the electronic parking control system includes a first zone controller 1 and a second zone controller 2, and at least two EPB control circuits, including a first EPB control circuit 10 and a second EPB control circuit 20. The first EPB control circuit 10 is integrated into the first zone controller 1, and the second EPB control circuit 20 is integrated into the second zone controller 2. The first zone controller 1 and the second zone controller 2 each also include an input / output module 50, which is electrically connected to a control module 11 and further connected to external vehicle sensors and / or loads 60 located within the vehicle components. The control module 11 is further configured to control the vehicle components based on signals collected from the external vehicle sensors and / or loads 60 via the input / output module 50. When implementing the EPB control function within the zone controllers, the power monitoring unit 110 and the main control unit 112 can also support other vehicle body and chassis functions, thereby reducing the number of zone controllers in the vehicle, as well as the overall volume and weight.

[0078] Optionally, the first zone controller 1 further includes an EPB switch detection circuit 70 , and the EPB switch detection circuit 70 is connected to the driving module in the first EPB control circuit 10 .

[0079] The electronic parking control system further includes a power module 80 , which is configured to provide a second power supply for the EPB control circuit.

[0080] Optionally, both the first and second regional controllers 1 and 2 further include a power supply anti-reverse filter module 90. The output of the power supply module 80 is connected to the input of the power supply anti-reverse filter module 90, which is also connected to the EPB control circuit. The power supply module 80 is configured to provide a second power supply for the EPB control circuit. The power supply anti-reverse filter module 90 is configured to prevent the positive and negative input terminals of the power supply module 80 from being reversely connected, thereby damaging the chips in the EPB control circuit.

[0081] The EPB control circuits in the two zone controllers are identical, except that the first zone controller 1 includes an EPB switch detection circuit 70. The first EPB control circuit 10 and the second EPB control circuit 20 can adopt the EPB control circuit provided in any of the above embodiments, which will not be described in detail here.

[0082] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An electronic parking control system, characterized in that: include: At least two EPB control circuits, each of the EPB control circuits being communicatively connected, and each of the EPB control circuits comprising a control module and a drive module; The control module is electrically connected to an input end of the drive module, and an output end of the drive module is electrically connected to a motor of the vehicle. The control module is configured to send a first control signal to the drive module upon receiving a parking command, and the drive module is configured to send a drive signal to the corresponding motor according to the first control signal, and the motor is configured to drive the caliper of the vehicle to operate according to the drive signal. The control module is further configured to control the drive module to stop outputting the drive signal to the motor when a fault of the control module and / or a fault of the motor is detected. Wherein, different EPB control circuits are connected to different motor-driven calipers; The control module includes a power monitoring unit, a power control unit and a main control unit; The input end of the power monitoring unit is communicatively connected to the first communication port of the main control unit, the output end of the power monitoring unit is connected to the control end of the power control unit, and the power monitoring unit is configured to output a fault signal when a fault occurs in the power monitoring unit or in the main control unit; The first output terminal of the power control unit is connected to the first input terminal of the driving module, and the second output terminal of the power control unit is connected to the second input terminal of the driving module. The power control unit is used to control the driving module to stop outputting the driving signal according to the fault signal input by the control terminal; The first output terminal and the second output terminal of the main control unit are connected to the first input terminal and the second input terminal of the driving module respectively, and the main control unit is used to send a first control signal to the driving module when receiving a parking command; The driving module includes an H-bridge driving unit and an H-bridge unit; The input end of the H-bridge unit is respectively connected to the first output end, the second output end, the third output end, the fourth output end, the fifth output end, the sixth output end and the seventh output end of the H-bridge driving unit, the output end of the H-bridge unit is connected to the motor, the first end of the H-bridge unit is connected to the second power supply, and the second end of the H-bridge unit is grounded; the H-bridge unit is used to output a driving signal according to the second control signal output by the output end of the H-bridge driving unit to control the operation of the motor.

2. The electronic parking control system according to claim 1, characterized in that: The power control unit includes a first transistor, a first resistor, a first diode and a second diode; The base of the first transistor serves as a control terminal of the power control unit, the first electrode of the first transistor is respectively connected to the first end of the first resistor and the anode of the first diode, the second electrode of the first transistor is grounded, and the second end of the first resistor is connected to the first power supply; The cathode of the first diode serves as the first output terminal of the power control unit, the anode of the second diode is connected to the anode of the first diode, and the cathode of the second diode serves as the second output terminal of the power control unit.

3. The electronic parking control system according to claim 1, characterized in that: The driving module is also used to detect motor failure; the second communication port of the main control unit is connected to the first output end of the driving module, and the main control unit is used to control the driving module to stop outputting the driving signal when it obtains the motor failure through the driving module.

4. The electronic parking control system according to claim 1, characterized in that: The EPB control circuit also includes a recovery module, the first input end of the recovery module is connected to the first output end of the main control unit, the first output end of the recovery module is connected to the first input end of the main control unit, the second input end of the recovery module is connected to the second output end of the main control unit, and the second output end of the recovery module is connected to the second input end of the main control unit. The recovery module is used to monitor the first control signal of the first output end and the second output end of the main control unit, and when the first control signal fails, control the drive module to stop outputting the drive signal to the motor.

5. The electronic parking control system according to claim 1, characterized in that: The EPB control circuit further includes a first current detection module and a second current detection module; The first end of the first current detection module is connected to the positive electrode of the first analog signal input end of the H-bridge driving unit, and the second end of the first current detection module is connected to the negative electrode of the first analog signal input end of the H-bridge driving unit and the first end of the H-bridge unit respectively; A first end of the second current detection module is connected to the positive electrode of the second analog signal input end of the H-bridge driving unit, and a second end of the second current detection module is connected to the negative electrode of the second analog signal input end of the H-bridge driving unit and the second end of the H-bridge unit respectively; The first current detection module and the second current detection module are used to collect the output current of the H-bridge unit. The H-bridge driving unit is further used to control the H-bridge unit to stop outputting the driving signal when the output current of the H-bridge unit is greater than a set current.

6. The electronic parking control system according to claim 1, characterized in that: The H-bridge unit includes a second transistor, a third transistor, a fourth transistor and a fifth transistor; The gate of the second transistor is connected to the first output terminal of the H-bridge driving unit, the first electrode of the second transistor is connected to the first electrode of the third transistor, the second electrode of the second transistor is connected to the first electrode of the fourth transistor, and the first electrode of the second transistor serves as the first end of the H-bridge unit; The gate of the third transistor is connected to the second output terminal of the H-bridge driving unit, and the second electrode of the third transistor is connected to the first electrode of the fourth transistor; The gate of the fourth transistor is connected to the third output terminal of the H-bridge driving unit, the first electrode of the fourth transistor is connected to the fourth output terminal of the H-bridge driving unit, the second electrode of the fourth transistor is connected to the second electrode of the fifth transistor, and the second electrode of the fourth transistor serves as the second end of the H-bridge unit; The gate of the fifth transistor is connected to the fifth output terminal of the H-bridge driving unit, the first electrode of the fifth transistor is connected to the sixth output terminal of the H-bridge driving unit, and the second electrode of the fifth transistor is connected to the seventh output terminal of the H-bridge driving unit.

7. The electronic parking control system according to claim 1, characterized in that: The electronic parking control system includes a first zone controller and a second zone controller, and the at least two EPB control circuits include a first EPB control circuit and a second EPB control circuit, the first EPB control circuit is integrated into the first zone controller, and the second EPB control circuit is integrated into the second zone controller; The first area controller and the second area controller both further include an input / output module, which is electrically connected to the control module. The input / output module is also connected to vehicle external sensors and / or loads at the vehicle component structure. The control module is further configured to control the vehicle component structure to perform actions based on signals collected from the vehicle external sensors and / or loads via the input / output module.

8. The electronic parking control system according to claim 7, characterized in that: The first zone controller further includes an EPB switch detection circuit, and the EPB switch detection circuit is connected to the driving module in the first EPB control circuit.

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